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foss-fpga-tools / third_party / nextpnr / refs/heads/generic-frontend / . / ecp5 / pack.cc
blob: d2a21c87bc0a725f9ac035ab291ca9eb4b4bcc38 [file] [log] [blame] [edit]
/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 David Shah <david@symbioticeda.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <algorithm>
#include <boost/optional.hpp>
#include <iterator>
#include <queue>
#include <unordered_set>
#include "cells.h"
#include "chain_utils.h"
#include "design_utils.h"
#include "globals.h"
#include "log.h"
#include "timing.h"
#include "util.h"
NEXTPNR_NAMESPACE_BEGIN
static bool is_nextpnr_iob(Context *ctx, CellInfo *cell)
{
return cell->type == ctx->id("$nextpnr_ibuf") || cell->type == ctx->id("$nextpnr_obuf") ||
cell->type == ctx->id("$nextpnr_iobuf");
}
class Ecp5Packer
{
public:
Ecp5Packer(Context *ctx) : ctx(ctx){};
private:
// Process the contents of packed_cells and new_cells
void flush_cells()
{
for (auto pcell : packed_cells) {
ctx->cells.erase(pcell);
}
for (auto &ncell : new_cells) {
ctx->cells[ncell->name] = std::move(ncell);
}
packed_cells.clear();
new_cells.clear();
}
// Print logic usgage
int available_slices = 0;
void print_logic_usage()
{
int total_luts = 0, total_ffs = 0;
int total_ramluts = 0, total_ramwluts = 0;
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) == id_TRELLIS_SLICE) {
available_slices += 1;
total_luts += 2;
total_ffs += 2;
Loc l = ctx->getBelLocation(bel);
if (l.z == 0 || l.z == 1)
total_ramluts += 2;
if (l.z == 2)
total_ramwluts += 2;
}
}
int used_lgluts = 0, used_cyluts = 0, used_ramluts = 0, used_ramwluts = 0, used_ffs = 0;
for (auto &cell : ctx->cells) {
CellInfo *ci = cell.second.get();
if (is_lut(ctx, ci))
++used_lgluts;
if (is_carry(ctx, ci))
used_cyluts += 2;
if (is_dpram(ctx, ci)) {
used_ramluts += 4;
used_ramwluts += 2;
}
if (is_ff(ctx, ci))
used_ffs += 2;
}
log_info("Logic utilisation before packing:\n");
auto pc = [](int used, int total) { return 100 * used / total; };
int used_luts = used_lgluts + used_cyluts + used_ramluts + used_ramwluts;
log_info(" Total LUT4s: %5d/%5d %5d%%\n", used_luts, total_luts, pc(used_luts, total_luts));
log_info(" logic LUTs: %5d/%5d %5d%%\n", used_lgluts, total_luts, pc(used_lgluts, total_luts));
log_info(" carry LUTs: %5d/%5d %5d%%\n", used_cyluts, total_luts, pc(used_cyluts, total_luts));
log_info(" RAM LUTs: %5d/%5d %5d%%\n", used_ramluts, total_ramluts, pc(used_ramluts, total_ramluts));
log_info(" RAMW LUTs: %5d/%5d %5d%%\n", used_ramwluts, total_ramwluts,
pc(used_ramwluts, total_ramwluts));
log_break();
log_info(" Total DFFs: %5d/%5d %5d%%\n", used_ffs, total_ffs, pc(used_ffs, total_ffs));
log_break();
}
// Find FFs associated with LUTs, or LUT expansion muxes
void find_lutff_pairs()
{
log_info("Finding LUTFF pairs...\n");
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (is_lut(ctx, ci) || is_pfumx(ctx, ci) || is_l6mux(ctx, ci)) {
NetInfo *znet = ci->ports.at(ctx->id("Z")).net;
if (znet != nullptr) {
CellInfo *ff = net_only_drives(ctx, znet, is_ff, ctx->id("DI"), false);
if (ff != nullptr) {
lutffPairs[ci->name] = ff->name;
fflutPairs[ff->name] = ci->name;
}
}
}
}
}
// Check if a flipflop is available in a slice
bool is_ff_available(CellInfo *slice, int ff)
{
if (get_net_or_empty(slice, (ff == 1) ? id_Q1 : id_Q0) != nullptr)
return false;
if (get_net_or_empty(slice, (ff == 1) ? id_M1 : id_M0) != nullptr)
return false;
return true;
}
// Check if a flipflop can be added to a slice
bool can_add_ff_to_slice(CellInfo *slice, CellInfo *ff)
{
std::string clkmux = str_or_default(ff->params, ctx->id("CLKMUX"), "CLK");
std::string lsrmux = str_or_default(ff->params, ctx->id("LSRMUX"), "LSR");
bool has_dpram = str_or_default(slice->params, ctx->id("MODE"), "LOGIC") == "DPRAM";
if (has_dpram) {
std::string wckmux = str_or_default(slice->params, ctx->id("WCKMUX"), "WCK");
std::string wremux = str_or_default(slice->params, ctx->id("WREMUX"), "WRE");
if (wckmux != clkmux && !(wckmux == "WCK" && clkmux == "CLK"))
return false;
if (wremux != lsrmux && !(wremux == "WRE" && lsrmux == "LSR"))
return false;
}
bool has_ff0 = get_net_or_empty(slice, id_Q0) != nullptr;
bool has_ff1 = get_net_or_empty(slice, id_Q1) != nullptr;
if (!has_ff0 && !has_ff1)
return true;
if (str_or_default(ff->params, ctx->id("GSR"), "DISABLED") !=
str_or_default(slice->params, ctx->id("GSR"), "DISABLED"))
return false;
if (str_or_default(ff->params, ctx->id("SRMODE"), "LSR_OVER_CE") !=
str_or_default(slice->params, ctx->id("SRMODE"), "LSR_OVER_CE"))
return false;
if (str_or_default(ff->params, ctx->id("CEMUX"), "1") != str_or_default(slice->params, ctx->id("CEMUX"), "1"))
return false;
if (str_or_default(ff->params, ctx->id("LSRMUX"), "LSR") !=
str_or_default(slice->params, ctx->id("LSRMUX"), "LSR"))
return false;
if (str_or_default(ff->params, ctx->id("CLKMUX"), "CLK") !=
str_or_default(slice->params, ctx->id("CLKMUX"), "CLK"))
return false;
if (net_or_nullptr(ff, ctx->id("CLK")) != net_or_nullptr(slice, ctx->id("CLK")))
return false;
if (net_or_nullptr(ff, ctx->id("CE")) != net_or_nullptr(slice, ctx->id("CE")))
return false;
if (net_or_nullptr(ff, ctx->id("LSR")) != net_or_nullptr(slice, ctx->id("LSR")))
return false;
return true;
}
const NetInfo *net_or_nullptr(CellInfo *cell, IdString port)
{
auto fnd = cell->ports.find(port);
if (fnd == cell->ports.end())
return nullptr;
else
return fnd->second.net;
}
// Return whether two FFs can be packed together in the same slice
bool can_pack_ffs(CellInfo *ff0, CellInfo *ff1)
{
if (str_or_default(ff0->params, ctx->id("GSR"), "DISABLED") !=
str_or_default(ff1->params, ctx->id("GSR"), "DISABLED"))
return false;
if (str_or_default(ff0->params, ctx->id("SRMODE"), "LSR_OVER_CE") !=
str_or_default(ff1->params, ctx->id("SRMODE"), "LSR_OVER_CE"))
return false;
if (str_or_default(ff0->params, ctx->id("CEMUX"), "1") != str_or_default(ff1->params, ctx->id("CEMUX"), "1"))
return false;
if (str_or_default(ff0->params, ctx->id("LSRMUX"), "LSR") !=
str_or_default(ff1->params, ctx->id("LSRMUX"), "LSR"))
return false;
if (str_or_default(ff0->params, ctx->id("CLKMUX"), "CLK") !=
str_or_default(ff1->params, ctx->id("CLKMUX"), "CLK"))
return false;
if (net_or_nullptr(ff0, ctx->id("CLK")) != net_or_nullptr(ff1, ctx->id("CLK")))
return false;
if (net_or_nullptr(ff0, ctx->id("CE")) != net_or_nullptr(ff1, ctx->id("CE")))
return false;
if (net_or_nullptr(ff0, ctx->id("LSR")) != net_or_nullptr(ff1, ctx->id("LSR")))
return false;
return true;
}
// Return whether or not an FF can be added to a tile (pairing checks must also be done using the fn above)
bool can_add_ff_to_tile(const std::vector<CellInfo *> &tile_ffs, CellInfo *ff0)
{
for (const auto &existing : tile_ffs) {
if (net_or_nullptr(existing, ctx->id("CLK")) != net_or_nullptr(ff0, ctx->id("CLK")))
return false;
if (net_or_nullptr(existing, ctx->id("LSR")) != net_or_nullptr(ff0, ctx->id("LSR")))
return false;
if (str_or_default(existing->params, ctx->id("CLKMUX"), "CLK") !=
str_or_default(ff0->params, ctx->id("CLKMUX"), "CLK"))
return false;
if (str_or_default(existing->params, ctx->id("LSRMUX"), "LSR") !=
str_or_default(ff0->params, ctx->id("LSRMUX"), "LSR"))
return false;
if (str_or_default(existing->params, ctx->id("SRMODE"), "LSR_OVER_CE") !=
str_or_default(ff0->params, ctx->id("SRMODE"), "LSR_OVER_CE"))
return false;
}
return true;
}
// Return true if a FF can be added to a DPRAM slice
bool can_pack_ff_dram(CellInfo *dpram, CellInfo *ff)
{
std::string wckmux = str_or_default(dpram->params, ctx->id("WCKMUX"), "WCK");
std::string clkmux = str_or_default(ff->params, ctx->id("CLKMUX"), "CLK");
if (wckmux != clkmux && !(wckmux == "WCK" && clkmux == "CLK"))
return false;
std::string wremux = str_or_default(dpram->params, ctx->id("WREMUX"), "WRE");
std::string lsrmux = str_or_default(ff->params, ctx->id("LSRMUX"), "LSR");
if (wremux != lsrmux && !(wremux == "WRE" && lsrmux == "LSR"))
return false;
return true;
}
// Return true if two LUTs can be paired considering FF compatibility
bool can_pack_lutff(IdString lut0, IdString lut1)
{
auto ff0 = lutffPairs.find(lut0), ff1 = lutffPairs.find(lut1);
if (ff0 != lutffPairs.end() && ff1 != lutffPairs.end()) {
return can_pack_ffs(ctx->cells.at(ff0->second).get(), ctx->cells.at(ff1->second).get());
} else {
return true;
}
}
// Find "closely connected" LUTs and pair them together
void pair_luts()
{
log_info("Finding LUT-LUT pairs...\n");
std::unordered_set<IdString> procdLuts;
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (is_lut(ctx, ci) && procdLuts.find(cell.first) == procdLuts.end()) {
NetInfo *znet = ci->ports.at(ctx->id("Z")).net;
std::vector<NetInfo *> inpnets;
if (znet != nullptr) {
for (auto user : znet->users) {
if (is_lut(ctx, user.cell) && user.cell != ci &&
procdLuts.find(user.cell->name) == procdLuts.end()) {
if (can_pack_lutff(ci->name, user.cell->name)) {
procdLuts.insert(ci->name);
procdLuts.insert(user.cell->name);
lutPairs[ci->name] = user.cell->name;
goto paired;
}
}
}
if (false) {
paired:
continue;
}
}
if (lutffPairs.find(ci->name) != lutffPairs.end()) {
NetInfo *qnet = ctx->cells.at(lutffPairs[ci->name])->ports.at(ctx->id("Q")).net;
if (qnet != nullptr) {
for (auto user : qnet->users) {
if (is_lut(ctx, user.cell) && user.cell != ci &&
procdLuts.find(user.cell->name) == procdLuts.end()) {
if (can_pack_lutff(ci->name, user.cell->name)) {
procdLuts.insert(ci->name);
procdLuts.insert(user.cell->name);
lutPairs[ci->name] = user.cell->name;
goto paired_ff;
}
}
}
if (false) {
paired_ff:
continue;
}
}
}
for (const char *inp : {"A", "B", "C", "D"}) {
if (!ci->ports.count(ctx->id(inp)))
continue;
NetInfo *innet = ci->ports.at(ctx->id(inp)).net;
if (innet != nullptr && innet->driver.cell != nullptr) {
CellInfo *drv = innet->driver.cell;
if (is_lut(ctx, drv) && drv != ci && innet->driver.port == ctx->id("Z")) {
if (procdLuts.find(drv->name) == procdLuts.end()) {
if (can_pack_lutff(ci->name, drv->name)) {
procdLuts.insert(ci->name);
procdLuts.insert(drv->name);
lutPairs[ci->name] = drv->name;
goto paired_inlut;
}
}
} else if (is_ff(ctx, drv) && innet->driver.port == ctx->id("Q")) {
auto fflut = fflutPairs.find(drv->name);
if (fflut != fflutPairs.end() && fflut->second != ci->name &&
procdLuts.find(fflut->second) == procdLuts.end()) {
if (can_pack_lutff(ci->name, fflut->second)) {
procdLuts.insert(ci->name);
procdLuts.insert(fflut->second);
lutPairs[ci->name] = fflut->second;
goto paired_inlut;
}
}
}
}
}
// Pack LUTs feeding the same CCU2, RAM or DFF into a SLICE
if (znet != nullptr && znet->users.size() < 10) {
for (auto user : znet->users) {
if (is_lc(ctx, user.cell) || user.cell->type == ctx->id("DP16KD") || is_ff(ctx, user.cell)) {
for (auto port : user.cell->ports) {
if (port.second.type != PORT_IN || port.second.net == nullptr ||
port.second.net == znet)
continue;
if (port.second.net->users.size() > 10)
continue;
CellInfo *drv = port.second.net->driver.cell;
if (drv == nullptr)
continue;
if (is_lut(ctx, drv) && !procdLuts.count(drv->name) &&
can_pack_lutff(ci->name, drv->name)) {
procdLuts.insert(ci->name);
procdLuts.insert(drv->name);
lutPairs[ci->name] = drv->name;
goto paired_inlut;
}
}
}
}
}
// Pack LUTs sharing an input with a simple fanout-based heuristic
for (const char *inp : {"A", "B", "C", "D"}) {
if (!ci->ports.count(ctx->id(inp)))
continue;
NetInfo *innet = ci->ports.at(ctx->id(inp)).net;
if (innet != nullptr && innet->users.size() < 5 && innet->users.size() > 1)
inpnets.push_back(innet);
}
std::sort(inpnets.begin(), inpnets.end(),
[&](const NetInfo *a, const NetInfo *b) { return a->users.size() < b->users.size(); });
for (auto inet : inpnets) {
for (auto &user : inet->users) {
if (user.cell == nullptr || user.cell == ci || !is_lut(ctx, user.cell))
continue;
if (procdLuts.count(user.cell->name))
continue;
if (can_pack_lutff(ci->name, user.cell->name)) {
procdLuts.insert(ci->name);
procdLuts.insert(user.cell->name);
lutPairs[ci->name] = user.cell->name;
goto paired_inlut;
}
}
}
if (false) {
paired_inlut:
continue;
}
}
}
if (ctx->debug) {
log_info("Singleton LUTs (packer QoR debug): \n");
for (auto cell : sorted(ctx->cells))
if (is_lut(ctx, cell.second) && !procdLuts.count(cell.first))
log_info(" %s\n", cell.first.c_str(ctx));
}
}
// Return true if an port is a top level port that provides its own IOBUF
bool is_top_port(PortRef &port)
{
if (port.cell == nullptr)
return false;
if (port.cell->type == id_DCUA) {
return port.port == id_CH0_HDINP || port.port == id_CH0_HDINN || port.port == id_CH0_HDOUTP ||
port.port == id_CH0_HDOUTN || port.port == id_CH1_HDINP || port.port == id_CH1_HDINN ||
port.port == id_CH1_HDOUTP || port.port == id_CH1_HDOUTN;
} else if (port.cell->type == id_EXTREFB) {
return port.port == id_REFCLKP || port.port == id_REFCLKN;
} else {
return false;
}
}
// Return true if a net only drives a top port
bool drives_top_port(NetInfo *net, PortRef &tp)
{
if (net == nullptr)
return false;
for (auto user : net->users) {
if (is_top_port(user)) {
if (net->users.size() > 1)
log_error(" port %s.%s must be connected to (and only to) a top level pin\n",
user.cell->name.c_str(ctx), user.port.c_str(ctx));
tp = user;
return true;
}
}
if (net->driver.cell != nullptr && is_top_port(net->driver)) {
if (net->users.size() > 1)
log_error(" port %s.%s must be connected to (and only to) a top level pin\n",
net->driver.cell->name.c_str(ctx), net->driver.port.c_str(ctx));
tp = net->driver;
return true;
}
return false;
}
// Simple "packer" to remove nextpnr IOBUFs, this assumes IOBUFs are manually instantiated
void pack_io()
{
log_info("Packing IOs..\n");
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (is_nextpnr_iob(ctx, ci)) {
CellInfo *trio = nullptr;
NetInfo *ionet = nullptr;
PortRef tp;
if (ci->type == ctx->id("$nextpnr_ibuf") || ci->type == ctx->id("$nextpnr_iobuf")) {
ionet = ci->ports.at(ctx->id("O")).net;
trio = net_only_drives(ctx, ionet, is_trellis_io, ctx->id("B"), true, ci);
} else if (ci->type == ctx->id("$nextpnr_obuf")) {
ionet = ci->ports.at(ctx->id("I")).net;
trio = net_only_drives(ctx, ci->ports.at(ctx->id("I")).net, is_trellis_io, ctx->id("B"), true, ci);
}
if (bool_or_default(ctx->settings, ctx->id("arch.ooc"))) {
// No IO buffer insertion in out-of-context mode, just remove the nextpnr buffer
// and leave the top level port
for (auto &port : ci->ports)
disconnect_port(ctx, ci, port.first);
} else if (trio != nullptr) {
// Trivial case, TRELLIS_IO used. Just remove the IOBUF
log_info("%s feeds TRELLIS_IO %s, removing %s %s.\n", ci->name.c_str(ctx), trio->name.c_str(ctx),
ci->type.c_str(ctx), ci->name.c_str(ctx));
NetInfo *net = trio->ports.at(ctx->id("B")).net;
if (((ci->type == ctx->id("$nextpnr_ibuf") || ci->type == ctx->id("$nextpnr_iobuf")) &&
net->users.size() > 1) ||
(ci->type == ctx->id("$nextpnr_obuf") &&
(net->users.size() > 2 || net->driver.cell != nullptr)) ||
(ci->type == ctx->id("$nextpnr_iobuf") && ci->ports.at(ctx->id("I")).net != nullptr &&
ci->ports.at(ctx->id("I")).net->driver.cell != nullptr))
log_error("Pin B of %s '%s' connected to more than a single top level IO.\n",
trio->type.c_str(ctx), trio->name.c_str(ctx));
if (net != nullptr) {
if (net->clkconstr != nullptr && trio->ports.count(ctx->id("O"))) {
NetInfo *onet = trio->ports.at(ctx->id("O")).net;
if (onet != nullptr && !onet->clkconstr) {
// Move clock constraint from IO pad to input buffer output
std::swap(net->clkconstr, onet->clkconstr);
}
}
}
} else if (drives_top_port(ionet, tp)) {
log_info("%s feeds %s %s.%s, removing %s %s.\n", ci->name.c_str(ctx), tp.cell->type.c_str(ctx),
tp.cell->name.c_str(ctx), tp.port.c_str(ctx), ci->type.c_str(ctx), ci->name.c_str(ctx));
if (ionet != nullptr) {
ctx->nets.erase(ionet->name);
tp.cell->ports.at(tp.port).net = nullptr;
}
if (ci->type == ctx->id("$nextpnr_iobuf")) {
NetInfo *net2 = ci->ports.at(ctx->id("I")).net;
if (net2 != nullptr) {
ctx->nets.erase(net2->name);
}
}
} else {
// Create a TRELLIS_IO buffer
std::unique_ptr<CellInfo> tr_cell =
create_ecp5_cell(ctx, ctx->id("TRELLIS_IO"), ci->name.str(ctx) + "$tr_io");
nxio_to_tr(ctx, ci, tr_cell.get(), new_cells, packed_cells);
new_cells.push_back(std::move(tr_cell));
trio = new_cells.back().get();
}
for (auto port : ci->ports)
disconnect_port(ctx, ci, port.first);
packed_cells.insert(ci->name);
if (trio != nullptr) {
for (const auto &attr : ci->attrs)
trio->attrs[attr.first] = attr.second;
auto loc_attr = trio->attrs.find(ctx->id("LOC"));
if (loc_attr != trio->attrs.end()) {
std::string pin = loc_attr->second.as_string();
BelId pinBel = ctx->getPackagePinBel(pin);
if (pinBel == BelId()) {
log_error("IO pin '%s' constrained to pin '%s', which does not exist for package '%s'.\n",
trio->name.c_str(ctx), pin.c_str(), ctx->args.package.c_str());
} else {
log_info("pin '%s' constrained to Bel '%s'.\n", trio->name.c_str(ctx),
ctx->getBelName(pinBel).c_str(ctx));
}
trio->attrs[ctx->id("BEL")] = ctx->getBelName(pinBel).str(ctx);
}
}
}
}
flush_cells();
}
// Pass to pack LUT5s into a newly created slice
void pack_lut5xs()
{
log_info("Packing LUT5-7s...\n");
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (is_pfumx(ctx, ci)) {
std::unique_ptr<CellInfo> packed =
create_ecp5_cell(ctx, ctx->id("TRELLIS_SLICE"), ci->name.str(ctx) + "_SLICE");
NetInfo *f0 = ci->ports.at(ctx->id("BLUT")).net;
if (f0 == nullptr)
log_error("PFUMX '%s' has disconnected port 'BLUT'\n", ci->name.c_str(ctx));
NetInfo *f1 = ci->ports.at(ctx->id("ALUT")).net;
if (f1 == nullptr)
log_error("PFUMX '%s' has disconnected port 'ALUT'\n", ci->name.c_str(ctx));
CellInfo *lut0 = net_driven_by(ctx, f0, is_lut, ctx->id("Z"));
CellInfo *lut1 = net_driven_by(ctx, f1, is_lut, ctx->id("Z"));
if (lut0 == nullptr)
log_error("PFUMX '%s' has BLUT driven by cell other than a LUT\n", ci->name.c_str(ctx));
if (lut1 == nullptr)
log_error("PFUMX '%s' has ALUT driven by cell other than a LUT\n", ci->name.c_str(ctx));
if (ctx->verbose)
log_info(" mux '%s' forms part of a LUT5\n", cell.first.c_str(ctx));
replace_port(lut0, ctx->id("A"), packed.get(), ctx->id("A0"));
replace_port(lut0, ctx->id("B"), packed.get(), ctx->id("B0"));
replace_port(lut0, ctx->id("C"), packed.get(), ctx->id("C0"));
replace_port(lut0, ctx->id("D"), packed.get(), ctx->id("D0"));
replace_port(lut1, ctx->id("A"), packed.get(), ctx->id("A1"));
replace_port(lut1, ctx->id("B"), packed.get(), ctx->id("B1"));
replace_port(lut1, ctx->id("C"), packed.get(), ctx->id("C1"));
replace_port(lut1, ctx->id("D"), packed.get(), ctx->id("D1"));
replace_port(ci, ctx->id("C0"), packed.get(), ctx->id("M0"));
replace_port(ci, ctx->id("Z"), packed.get(), ctx->id("OFX0"));
packed->params[ctx->id("LUT0_INITVAL")] =
get_or_default(lut0->params, ctx->id("INIT"), Property(0, 16));
packed->params[ctx->id("LUT1_INITVAL")] =
get_or_default(lut1->params, ctx->id("INIT"), Property(0, 16));
ctx->nets.erase(f0->name);
ctx->nets.erase(f1->name);
sliceUsage[packed->name].lut0_used = true;
sliceUsage[packed->name].lut1_used = true;
sliceUsage[packed->name].mux5_used = true;
if (lutffPairs.find(ci->name) != lutffPairs.end()) {
CellInfo *ff = ctx->cells.at(lutffPairs[ci->name]).get();
ff_to_slice(ctx, ff, packed.get(), 0, true);
packed_cells.insert(ff->name);
sliceUsage[packed->name].ff0_used = true;
lutffPairs.erase(ci->name);
fflutPairs.erase(ff->name);
}
new_cells.push_back(std::move(packed));
packed_cells.insert(lut0->name);
packed_cells.insert(lut1->name);
packed_cells.insert(ci->name);
}
}
flush_cells();
// Pack LUT6s
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (is_l6mux(ctx, ci)) {
NetInfo *ofx0_0 = ci->ports.at(ctx->id("D0")).net;
if (ofx0_0 == nullptr)
log_error("L6MUX21 '%s' has disconnected port 'D0'\n", ci->name.c_str(ctx));
NetInfo *ofx0_1 = ci->ports.at(ctx->id("D1")).net;
if (ofx0_1 == nullptr)
log_error("L6MUX21 '%s' has disconnected port 'D1'\n", ci->name.c_str(ctx));
CellInfo *slice0 = net_driven_by(ctx, ofx0_0, is_lc, ctx->id("OFX0"));
CellInfo *slice1 = net_driven_by(ctx, ofx0_1, is_lc, ctx->id("OFX0"));
if (slice0 == nullptr) {
if (!net_driven_by(ctx, ofx0_0, is_l6mux, ctx->id("Z")) &&
!net_driven_by(ctx, ofx0_0, is_lc, ctx->id("OFX1")))
log_error("L6MUX21 '%s' has D0 driven by cell other than a SLICE OFX0 but not a LUT7 mux "
"('%s.%s')\n",
ci->name.c_str(ctx), ofx0_0->driver.cell->name.c_str(ctx),
ofx0_0->driver.port.c_str(ctx));
continue;
}
if (slice1 == nullptr) {
if (!net_driven_by(ctx, ofx0_1, is_l6mux, ctx->id("Z")) &&
!net_driven_by(ctx, ofx0_1, is_lc, ctx->id("OFX1")))
log_error("L6MUX21 '%s' has D1 driven by cell other than a SLICE OFX0 but not a LUT7 mux "
"('%s.%s')\n",
ci->name.c_str(ctx), ofx0_0->driver.cell->name.c_str(ctx),
ofx0_0->driver.port.c_str(ctx));
continue;
}
if (ctx->verbose)
log_info(" mux '%s' forms part of a LUT6\n", cell.first.c_str(ctx));
replace_port(ci, ctx->id("D0"), slice1, id_FXA);
replace_port(ci, ctx->id("D1"), slice1, id_FXB);
replace_port(ci, ctx->id("SD"), slice1, id_M1);
replace_port(ci, ctx->id("Z"), slice1, id_OFX1);
slice0->constr_z = 1;
slice0->constr_x = 0;
slice0->constr_y = 0;
slice0->constr_parent = slice1;
slice1->constr_z = 0;
slice1->constr_abs_z = true;
slice1->constr_children.push_back(slice0);
if (lutffPairs.find(ci->name) != lutffPairs.end()) {
CellInfo *ff = ctx->cells.at(lutffPairs[ci->name]).get();
ff_to_slice(ctx, ff, slice1, 1, true);
packed_cells.insert(ff->name);
sliceUsage[slice1->name].ff1_used = true;
lutffPairs.erase(ci->name);
fflutPairs.erase(ff->name);
}
packed_cells.insert(ci->name);
}
}
flush_cells();
// Pack LUT7s
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (is_l6mux(ctx, ci)) {
NetInfo *ofx1_0 = ci->ports.at(ctx->id("D0")).net;
if (ofx1_0 == nullptr)
log_error("L6MUX21 '%s' has disconnected port 'D0'\n", ci->name.c_str(ctx));
NetInfo *ofx1_1 = ci->ports.at(ctx->id("D1")).net;
if (ofx1_1 == nullptr)
log_error("L6MUX21 '%s' has disconnected port 'D1'\n", ci->name.c_str(ctx));
CellInfo *slice1 = net_driven_by(ctx, ofx1_0, is_lc, ctx->id("OFX1"));
CellInfo *slice3 = net_driven_by(ctx, ofx1_1, is_lc, ctx->id("OFX1"));
if (slice1 == nullptr)
log_error("L6MUX21 '%s' has D0 driven by cell other than a SLICE OFX ('%s.%s')\n",
ci->name.c_str(ctx), ofx1_0->driver.cell->name.c_str(ctx),
ofx1_0->driver.port.c_str(ctx));
if (slice3 == nullptr)
log_error("L6MUX21 '%s' has D1 driven by cell other than a SLICE OFX ('%s.%s')\n",
ci->name.c_str(ctx), ofx1_1->driver.cell->name.c_str(ctx),
ofx1_1->driver.port.c_str(ctx));
NetInfo *fxa_0 = slice1->ports.at(id_FXA).net;
if (fxa_0 == nullptr)
log_error("SLICE '%s' has disconnected port 'FXA'\n", slice1->name.c_str(ctx));
NetInfo *fxa_1 = slice3->ports.at(id_FXA).net;
if (fxa_1 == nullptr)
log_error("SLICE '%s' has disconnected port 'FXA'\n", slice3->name.c_str(ctx));
CellInfo *slice0 = net_driven_by(ctx, fxa_0, is_lc, ctx->id("OFX0"));
CellInfo *slice2 = net_driven_by(ctx, fxa_1, is_lc, ctx->id("OFX0"));
if (slice0 == nullptr)
log_error("SLICE '%s' has FXA driven by cell other than a SLICE OFX0 ('%s.%s')\n",
slice1->name.c_str(ctx), fxa_0->driver.cell->name.c_str(ctx),
fxa_0->driver.port.c_str(ctx));
if (slice2 == nullptr)
log_error("SLICE '%s' has FXA driven by cell other than a SLICE OFX0 ('%s.%s')\n",
slice3->name.c_str(ctx), fxa_1->driver.cell->name.c_str(ctx),
fxa_1->driver.port.c_str(ctx));
replace_port(ci, ctx->id("D0"), slice2, id_FXA);
replace_port(ci, ctx->id("D1"), slice2, id_FXB);
replace_port(ci, ctx->id("SD"), slice2, id_M1);
replace_port(ci, ctx->id("Z"), slice2, id_OFX1);
for (auto slice : {slice0, slice1, slice2, slice3}) {
slice->constr_children.clear();
slice->constr_abs_z = false;
slice->constr_x = slice->UNCONSTR;
slice->constr_y = slice->UNCONSTR;
slice->constr_z = slice->UNCONSTR;
slice->constr_parent = nullptr;
}
slice3->constr_children.clear();
slice3->constr_abs_z = true;
slice3->constr_z = 0;
slice2->constr_children.clear();
slice2->constr_abs_z = true;
slice2->constr_z = 1;
slice2->constr_x = 0;
slice2->constr_y = 0;
slice2->constr_parent = slice3;
slice3->constr_children.push_back(slice2);
slice1->constr_children.clear();
slice1->constr_abs_z = true;
slice1->constr_z = 2;
slice1->constr_x = 0;
slice1->constr_y = 0;
slice1->constr_parent = slice3;
slice3->constr_children.push_back(slice1);
slice0->constr_children.clear();
slice0->constr_abs_z = true;
slice0->constr_z = 3;
slice0->constr_x = 0;
slice0->constr_y = 0;
slice0->constr_parent = slice3;
slice3->constr_children.push_back(slice0);
if (lutffPairs.find(ci->name) != lutffPairs.end()) {
CellInfo *ff = ctx->cells.at(lutffPairs[ci->name]).get();
ff_to_slice(ctx, ff, slice2, 1, true);
packed_cells.insert(ff->name);
sliceUsage[slice2->name].ff1_used = true;
lutffPairs.erase(ci->name);
fflutPairs.erase(ff->name);
}
packed_cells.insert(ci->name);
}
}
flush_cells();
}
// Create a feed in to the carry chain
CellInfo *make_carry_feed_in(NetInfo *carry, PortRef chain_in)
{
std::unique_ptr<CellInfo> feedin = create_ecp5_cell(ctx, ctx->id("CCU2C"));
feedin->params[ctx->id("INIT0")] = Property(10, 16); // LUT4 = 0; LUT2 = A
feedin->params[ctx->id("INIT1")] = Property(65535, 16);
feedin->params[ctx->id("INJECT1_0")] = std::string("NO");
feedin->params[ctx->id("INJECT1_1")] = std::string("YES");
carry->users.erase(std::remove_if(carry->users.begin(), carry->users.end(),
[chain_in](const PortRef &user) {
return user.port == chain_in.port && user.cell == chain_in.cell;
}),
carry->users.end());
connect_port(ctx, carry, feedin.get(), id_A0);
std::unique_ptr<NetInfo> new_carry(new NetInfo());
new_carry->name = ctx->id(feedin->name.str(ctx) + "$COUT");
connect_port(ctx, new_carry.get(), feedin.get(), ctx->id("COUT"));
chain_in.cell->ports[chain_in.port].net = nullptr;
connect_port(ctx, new_carry.get(), chain_in.cell, chain_in.port);
CellInfo *feedin_ptr = feedin.get();
IdString feedin_name = feedin->name;
ctx->cells[feedin_name] = std::move(feedin);
IdString new_carry_name = new_carry->name;
ctx->nets[new_carry_name] = std::move(new_carry);
return feedin_ptr;
}
// Create a feed out and loop through from the carry chain
CellInfo *make_carry_feed_out(NetInfo *carry, boost::optional<PortRef> chain_next = boost::optional<PortRef>())
{
std::unique_ptr<CellInfo> feedout = create_ecp5_cell(ctx, ctx->id("CCU2C"));
feedout->params[ctx->id("INIT0")] = Property(0, 16);
feedout->params[ctx->id("INIT1")] = Property(10, 16); // LUT4 = 0; LUT2 = A
feedout->params[ctx->id("INJECT1_0")] = std::string("NO");
feedout->params[ctx->id("INJECT1_1")] = std::string("NO");
PortRef carry_drv = carry->driver;
carry->driver.cell = nullptr;
connect_port(ctx, carry, feedout.get(), ctx->id("S0"));
std::unique_ptr<NetInfo> new_cin(new NetInfo());
new_cin->name = ctx->id(feedout->name.str(ctx) + "$CIN");
new_cin->driver = carry_drv;
carry_drv.cell->ports.at(carry_drv.port).net = new_cin.get();
connect_port(ctx, new_cin.get(), feedout.get(), ctx->id("CIN"));
if (chain_next) {
// Loop back into LUT4_1 for feedthrough
connect_port(ctx, carry, feedout.get(), id_A1);
carry->users.erase(std::remove_if(carry->users.begin(), carry->users.end(),
[chain_next](const PortRef &user) {
return user.port == chain_next->port && user.cell == chain_next->cell;
}),
carry->users.end());
std::unique_ptr<NetInfo> new_cout(new NetInfo());
new_cout->name = ctx->id(feedout->name.str(ctx) + "$COUT");
connect_port(ctx, new_cout.get(), feedout.get(), ctx->id("COUT"));
chain_next->cell->ports[chain_next->port].net = nullptr;
connect_port(ctx, new_cout.get(), chain_next->cell, chain_next->port);
IdString new_cout_name = new_cout->name;
ctx->nets[new_cout_name] = std::move(new_cout);
}
CellInfo *feedout_ptr = feedout.get();
IdString feedout_name = feedout->name;
ctx->cells[feedout_name] = std::move(feedout);
IdString new_cin_name = new_cin->name;
ctx->nets[new_cin_name] = std::move(new_cin);
return feedout_ptr;
}
// Split a carry chain into multiple legal chains
std::vector<CellChain> split_carry_chain(CellChain &carryc)
{
bool start_of_chain = true;
std::vector<CellChain> chains;
const int max_length = (ctx->chip_info->width - 4) * 4 - 2;
auto curr_cell = carryc.cells.begin();
while (curr_cell != carryc.cells.end()) {
CellInfo *cell = *curr_cell;
if (start_of_chain) {
chains.emplace_back();
start_of_chain = false;
if (cell->ports.at(ctx->id("CIN")).net) {
// CIN is not constant and not part of a chain. Must feed in from fabric
PortRef inport;
inport.cell = cell;
inport.port = ctx->id("CIN");
CellInfo *feedin = make_carry_feed_in(cell->ports.at(ctx->id("CIN")).net, inport);
chains.back().cells.push_back(feedin);
}
}
chains.back().cells.push_back(cell);
bool split_chain = int(chains.back().cells.size()) > max_length;
if (split_chain) {
CellInfo *passout = make_carry_feed_out(cell->ports.at(ctx->id("COUT")).net);
chains.back().cells.back() = passout;
start_of_chain = true;
} else {
NetInfo *carry_net = cell->ports.at(ctx->id("COUT")).net;
bool at_end = (curr_cell == carryc.cells.end() - 1);
if (carry_net != nullptr && (carry_net->users.size() > 1 || at_end)) {
boost::optional<PortRef> nextport;
if (!at_end) {
auto next_cell = *(curr_cell + 1);
PortRef nextpr;
nextpr.cell = next_cell;
nextpr.port = ctx->id("CIN");
nextport = nextpr;
}
CellInfo *passout = make_carry_feed_out(cell->ports.at(ctx->id("COUT")).net, nextport);
chains.back().cells.push_back(passout);
}
++curr_cell;
}
}
return chains;
}
// Pack carries and set up appropriate relative constraints
void pack_carries()
{
log_info("Packing carries...\n");
// Find all chains (including single carry cells)
auto carry_chains = find_chains(
ctx, [](const Context *ctx, const CellInfo *cell) { return is_carry(ctx, cell); },
[](const Context *ctx, const CellInfo *cell) {
return net_driven_by(ctx, cell->ports.at(ctx->id("CIN")).net, is_carry, ctx->id("COUT"));
},
[](const Context *ctx, const CellInfo *cell) {
return net_only_drives(ctx, cell->ports.at(ctx->id("COUT")).net, is_carry, ctx->id("CIN"), false);
},
1);
std::vector<CellChain> all_chains;
// Chain splitting
for (auto &base_chain : carry_chains) {
if (ctx->verbose) {
log_info("Found carry chain: \n");
for (auto entry : base_chain.cells)
log_info(" %s\n", entry->name.c_str(ctx));
log_info("\n");
}
std::vector<CellChain> split_chains = split_carry_chain(base_chain);
for (auto &chain : split_chains) {
all_chains.push_back(chain);
}
}
std::vector<std::vector<CellInfo *>> packed_chains;
// Chain packing
std::vector<std::tuple<CellInfo *, CellInfo *, int>> ff_packing;
for (auto &chain : all_chains) {
int cell_count = 0;
std::vector<CellInfo *> tile_ffs;
std::vector<CellInfo *> packed_chain;
for (auto &cell : chain.cells) {
if (cell_count % 4 == 0)
tile_ffs.clear();
std::unique_ptr<CellInfo> slice =
create_ecp5_cell(ctx, ctx->id("TRELLIS_SLICE"), cell->name.str(ctx) + "$CCU2_SLICE");
ccu2c_to_slice(ctx, cell, slice.get());
CellInfo *ff0 = nullptr;
NetInfo *f0net = slice->ports.at(ctx->id("F0")).net;
if (f0net != nullptr) {
ff0 = net_only_drives(ctx, f0net, is_ff, ctx->id("DI"), false);
if (ff0 != nullptr && can_add_ff_to_tile(tile_ffs, ff0)) {
ff_packing.push_back(std::make_tuple(ff0, slice.get(), 0));
tile_ffs.push_back(ff0);
packed_cells.insert(ff0->name);
}
}
CellInfo *ff1 = nullptr;
NetInfo *f1net = slice->ports.at(ctx->id("F1")).net;
if (f1net != nullptr) {
ff1 = net_only_drives(ctx, f1net, is_ff, ctx->id("DI"), false);
if (ff1 != nullptr && (ff0 == nullptr || can_pack_ffs(ff0, ff1)) &&
can_add_ff_to_tile(tile_ffs, ff1)) {
ff_packing.push_back(std::make_tuple(ff1, slice.get(), 1));
tile_ffs.push_back(ff1);
packed_cells.insert(ff1->name);
}
}
packed_chain.push_back(slice.get());
new_cells.push_back(std::move(slice));
packed_cells.insert(cell->name);
cell_count++;
}
packed_chains.push_back(packed_chain);
}
for (auto ff : ff_packing)
ff_to_slice(ctx, std::get<0>(ff), std::get<1>(ff), std::get<2>(ff), true);
// Relative chain placement
for (auto &chain : packed_chains) {
chain.at(0)->constr_abs_z = true;
chain.at(0)->constr_z = 0;
for (int i = 1; i < int(chain.size()); i++) {
chain.at(i)->constr_x = (i / 4);
chain.at(i)->constr_y = 0;
chain.at(i)->constr_z = i % 4;
chain.at(i)->constr_abs_z = true;
chain.at(i)->constr_parent = chain.at(0);
chain.at(0)->constr_children.push_back(chain.at(i));
}
}
flush_cells();
}
// Pack distributed RAM
void pack_dram()
{
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (is_dpram(ctx, ci)) {
// Create RAMW slice
std::unique_ptr<CellInfo> ramw_slice =
create_ecp5_cell(ctx, ctx->id("TRELLIS_SLICE"), ci->name.str(ctx) + "$RAMW_SLICE");
dram_to_ramw(ctx, ci, ramw_slice.get());
// Create actual RAM slices
std::unique_ptr<CellInfo> ram0_slice =
create_ecp5_cell(ctx, ctx->id("TRELLIS_SLICE"), ci->name.str(ctx) + "$DPRAM0_SLICE");
dram_to_ram_slice(ctx, ci, ram0_slice.get(), ramw_slice.get(), 0);
std::unique_ptr<CellInfo> ram1_slice =
create_ecp5_cell(ctx, ctx->id("TRELLIS_SLICE"), ci->name.str(ctx) + "$DPRAM1_SLICE");
dram_to_ram_slice(ctx, ci, ram1_slice.get(), ramw_slice.get(), 1);
// Disconnect ports of original cell after packing
disconnect_port(ctx, ci, id_WCK);
disconnect_port(ctx, ci, id_WRE);
disconnect_port(ctx, ci, ctx->id("RAD[0]"));
disconnect_port(ctx, ci, ctx->id("RAD[1]"));
disconnect_port(ctx, ci, ctx->id("RAD[2]"));
disconnect_port(ctx, ci, ctx->id("RAD[3]"));
// Attempt to pack FFs into RAM slices
std::vector<std::tuple<CellInfo *, CellInfo *, int>> ff_packing;
std::vector<CellInfo *> tile_ffs;
for (auto slice : {ram0_slice.get(), ram1_slice.get()}) {
CellInfo *ff0 = nullptr;
NetInfo *f0net = slice->ports.at(ctx->id("F0")).net;
if (f0net != nullptr) {
ff0 = net_only_drives(ctx, f0net, is_ff, ctx->id("DI"), false);
if (ff0 != nullptr && can_add_ff_to_tile(tile_ffs, ff0)) {
if (can_pack_ff_dram(slice, ff0)) {
ff_packing.push_back(std::make_tuple(ff0, slice, 0));
tile_ffs.push_back(ff0);
packed_cells.insert(ff0->name);
}
}
}
CellInfo *ff1 = nullptr;
NetInfo *f1net = slice->ports.at(ctx->id("F1")).net;
if (f1net != nullptr) {
ff1 = net_only_drives(ctx, f1net, is_ff, ctx->id("DI"), false);
if (ff1 != nullptr && (ff0 == nullptr || can_pack_ffs(ff0, ff1)) &&
can_add_ff_to_tile(tile_ffs, ff1)) {
if (can_pack_ff_dram(slice, ff1)) {
ff_packing.push_back(std::make_tuple(ff1, slice, 1));
tile_ffs.push_back(ff1);
packed_cells.insert(ff1->name);
}
}
}
}
for (auto ff : ff_packing)
ff_to_slice(ctx, std::get<0>(ff), std::get<1>(ff), std::get<2>(ff), true);
// Setup placement constraints
ram0_slice->constr_abs_z = true;
ram0_slice->constr_z = 0;
ram1_slice->constr_parent = ram0_slice.get();
ram1_slice->constr_abs_z = true;
ram1_slice->constr_x = 0;
ram1_slice->constr_y = 0;
ram1_slice->constr_z = 1;
ram0_slice->constr_children.push_back(ram1_slice.get());
ramw_slice->constr_parent = ram0_slice.get();
ramw_slice->constr_abs_z = true;
ramw_slice->constr_x = 0;
ramw_slice->constr_y = 0;
ramw_slice->constr_z = 2;
ram0_slice->constr_children.push_back(ramw_slice.get());
new_cells.push_back(std::move(ram0_slice));
new_cells.push_back(std::move(ram1_slice));
new_cells.push_back(std::move(ramw_slice));
packed_cells.insert(ci->name);
}
}
flush_cells();
}
// Pack LUTs that have been paired together
void pack_lut_pairs()
{
log_info("Packing paired LUTs into a SLICE...\n");
for (auto pair : lutPairs) {
CellInfo *lut0 = ctx->cells.at(pair.first).get();
CellInfo *lut1 = ctx->cells.at(pair.second).get();
std::unique_ptr<CellInfo> slice =
create_ecp5_cell(ctx, ctx->id("TRELLIS_SLICE"), lut0->name.str(ctx) + "_SLICE");
lut_to_slice(ctx, lut0, slice.get(), 0);
lut_to_slice(ctx, lut1, slice.get(), 1);
auto ff0 = lutffPairs.find(lut0->name);
if (ff0 != lutffPairs.end()) {
ff_to_slice(ctx, ctx->cells.at(ff0->second).get(), slice.get(), 0, true);
packed_cells.insert(ff0->second);
fflutPairs.erase(ff0->second);
lutffPairs.erase(lut0->name);
}
auto ff1 = lutffPairs.find(lut1->name);
if (ff1 != lutffPairs.end()) {
ff_to_slice(ctx, ctx->cells.at(ff1->second).get(), slice.get(), 1, true);
packed_cells.insert(ff1->second);
fflutPairs.erase(ff1->second);
lutffPairs.erase(lut1->name);
}
new_cells.push_back(std::move(slice));
packed_cells.insert(lut0->name);
packed_cells.insert(lut1->name);
}
flush_cells();
}
// Pack single LUTs that weren't paired into their own slice,
// with an optional FF also
void pack_remaining_luts()
{
log_info("Packing unpaired LUTs into a SLICE...\n");
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (is_lut(ctx, ci)) {
std::unique_ptr<CellInfo> slice =
create_ecp5_cell(ctx, ctx->id("TRELLIS_SLICE"), ci->name.str(ctx) + "_SLICE");
lut_to_slice(ctx, ci, slice.get(), 1);
auto ff = lutffPairs.find(ci->name);
if (ff != lutffPairs.end()) {
ff_to_slice(ctx, ctx->cells.at(ff->second).get(), slice.get(), 1, true);
packed_cells.insert(ff->second);
fflutPairs.erase(ff->second);
lutffPairs.erase(ci->name);
}
new_cells.push_back(std::move(slice));
packed_cells.insert(ci->name);
}
}
flush_cells();
}
// Find a cell that meets some criterea near an origin cell
// Used for packing an FF into a nearby SLICE
template <typename TFunc> CellInfo *find_nearby_cell(CellInfo *origin, TFunc Func)
{
std::unordered_set<CellInfo *> visited_cells;
std::queue<CellInfo *> to_visit;
visited_cells.insert(origin);
to_visit.push(origin);
int iter = 0;
while (!to_visit.empty() && iter < 10000) {
CellInfo *cursor = to_visit.front();
to_visit.pop();
if (Func(cursor))
return cursor;
for (const auto &port : cursor->ports) {
NetInfo *pn = port.second.net;
if (pn == nullptr)
continue;
// Skip high-fanout nets that are unlikely to be relevant
if (pn->users.size() > 25)
continue;
// Add other ports on this net if not already visited
auto visit_port = [&](const PortRef &port) {
if (port.cell == nullptr)
return;
if (visited_cells.count(port.cell))
return;
// If not already visited; add the cell of this port to the queue
to_visit.push(port.cell);
visited_cells.insert(port.cell);
};
visit_port(pn->driver);
for (const auto &usr : pn->users)
visit_port(usr);
}
++iter;
}
return nullptr;
}
// Pack flipflops that weren't paired with a LUT
float dense_pack_mode_thresh = 0.95f;
void pack_remaining_ffs()
{
// Enter dense flipflop packing mode once utilisation exceeds a threshold (default: 95%)
int used_slices = 0;
for (auto &cell : ctx->cells)
if (cell.second->type == id_TRELLIS_SLICE)
++used_slices;
log_info("Packing unpaired FFs into a SLICE...\n");
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (is_ff(ctx, ci)) {
bool pack_dense = used_slices > (dense_pack_mode_thresh * available_slices);
if (pack_dense) {
// If dense packing threshold exceeded; always try and pack the FF into an existing slice
// Find a SLICE with space "near" the flipflop in the netlist
std::vector<CellInfo *> ltile;
CellInfo *target = find_nearby_cell(ci, [&](CellInfo *cursor) {
if (cursor->type != id_TRELLIS_SLICE)
return false;
if (!cursor->constr_children.empty() || cursor->constr_parent != nullptr) {
auto &constr_children = (cursor->constr_parent != nullptr)
? cursor->constr_parent->constr_children
: cursor->constr_children;
// Skip big chains for performance
if (constr_children.size() > 8)
return false;
// Have to check the whole of the tile for legality when dealing with chains, not just slice
ltile.clear();
if (cursor->constr_parent != nullptr)
ltile.push_back(cursor->constr_parent);
else
ltile.push_back(cursor);
for (auto c : constr_children)
ltile.push_back(c);
if (!can_add_ff_to_tile(ltile, cursor))
return false;
}
if (!can_add_ff_to_slice(cursor, ci))
return false;
for (int i = 0; i < 2; i++)
if (is_ff_available(cursor, i))
return true;
return false;
});
// If found, add the FF to this slice instead of creating a new one
if (target != nullptr) {
for (int i = 0; i < 2; i++) {
if (is_ff_available(target, i)) {
ff_to_slice(ctx, ci, target, i, false);
goto ff_packed;
}
}
}
if (false) {
ff_packed:
packed_cells.insert(ci->name);
continue;
}
}
std::unique_ptr<CellInfo> slice =
create_ecp5_cell(ctx, ctx->id("TRELLIS_SLICE"), ci->name.str(ctx) + "_SLICE");
ff_to_slice(ctx, ci, slice.get(), 0, false);
new_cells.push_back(std::move(slice));
++used_slices;
packed_cells.insert(ci->name);
}
}
flush_cells();
}
int make_init_with_const_input(int init, int input, bool value)
{
int new_init = 0;
for (int i = 0; i < 16; i++) {
if (((i >> input) & 0x1) != value) {
int other_i = (i & (~(1 << input))) | (value << input);
if ((init >> other_i) & 0x1)
new_init |= (1 << i);
} else {
if ((init >> i) & 0x1)
new_init |= (1 << i);
}
}
return new_init;
}
void set_lut_input_constant(CellInfo *cell, IdString input, bool value)
{
int index = std::string("ABCD").find(input.str(ctx));
int init = int_or_default(cell->params, ctx->id("INIT"));
int new_init = make_init_with_const_input(init, index, value);
cell->params[ctx->id("INIT")] = Property(new_init, 16);
cell->ports.at(input).net = nullptr;
}
void set_ccu2c_input_constant(CellInfo *cell, IdString input, bool value)
{
std::string input_str = input.str(ctx);
int lut = std::stoi(input_str.substr(1));
int index = std::string("ABCD").find(input_str[0]);
int init = int_or_default(cell->params, ctx->id("INIT" + std::to_string(lut)));
int new_init = make_init_with_const_input(init, index, value);
cell->params[ctx->id("INIT" + std::to_string(lut))] = Property(new_init, 16);
cell->ports.at(input).net = nullptr;
}
bool is_ccu2c_port_high(CellInfo *cell, IdString input)
{
if (!cell->ports.count(input))
return true; // disconnected port is high
if (cell->ports.at(input).net == nullptr || cell->ports.at(input).net->name == ctx->id("$PACKER_VCC_NET"))
return true; // disconnected or tied-high port
if (cell->ports.at(input).net->driver.cell != nullptr &&
cell->ports.at(input).net->driver.cell->type == ctx->id("VCC"))
return true; // pre-pack high
return false;
}
// Merge a net into a constant net
void set_net_constant(const Context *ctx, NetInfo *orig, NetInfo *constnet, bool constval)
{
orig->driver.cell = nullptr;
for (auto user : orig->users) {
if (user.cell != nullptr) {
CellInfo *uc = user.cell;
if (ctx->verbose)
log_info("%s user %s\n", orig->name.c_str(ctx), uc->name.c_str(ctx));
if (is_lut(ctx, uc)) {
set_lut_input_constant(uc, user.port, constval);
} else if (is_ff(ctx, uc) && user.port == ctx->id("CE")) {
uc->params[ctx->id("CEMUX")] = std::string(constval ? "1" : "0");
uc->ports[user.port].net = nullptr;
} else if (is_carry(ctx, uc)) {
if (constval &&
(user.port == id_A0 || user.port == id_A1 || user.port == id_B0 || user.port == id_B1 ||
user.port == id_C0 || user.port == id_C1 || user.port == id_D0 || user.port == id_D1)) {
// Input tied high, nothing special to do (bitstream gen will auto-enable tie-high)
uc->ports[user.port].net = nullptr;
} else if (!constval) {
if (user.port == id_A0 || user.port == id_A1 || user.port == id_B0 || user.port == id_B1) {
// These inputs can be switched to tie-high without consequence
set_ccu2c_input_constant(uc, user.port, constval);
} else if (user.port == id_C0 && is_ccu2c_port_high(uc, id_D0)) {
// Partner must be tied high
set_ccu2c_input_constant(uc, user.port, constval);
} else if (user.port == id_D0 && is_ccu2c_port_high(uc, id_C0)) {
// Partner must be tied high
set_ccu2c_input_constant(uc, user.port, constval);
} else if (user.port == id_C1 && is_ccu2c_port_high(uc, id_D1)) {
// Partner must be tied high
set_ccu2c_input_constant(uc, user.port, constval);
} else if (user.port == id_D1 && is_ccu2c_port_high(uc, id_C1)) {
// Partner must be tied high
set_ccu2c_input_constant(uc, user.port, constval);
} else {
// Not allowed to change to a tie-high
uc->ports[user.port].net = constnet;
constnet->users.push_back(user);
}
} else {
uc->ports[user.port].net = constnet;
constnet->users.push_back(user);
}
} else if (is_ff(ctx, uc) && user.port == ctx->id("LSR") &&
((!constval && str_or_default(uc->params, ctx->id("LSRMUX"), "LSR") == "LSR") ||
(constval && str_or_default(uc->params, ctx->id("LSRMUX"), "LSR") == "INV"))) {
uc->ports[user.port].net = nullptr;
} else if (uc->type == id_DP16KD) {
if (user.port == id_CLKA || user.port == id_CLKB || user.port == id_RSTA || user.port == id_RSTB ||
user.port == id_WEA || user.port == id_WEB || user.port == id_CEA || user.port == id_CEB ||
user.port == id_OCEA || user.port == id_OCEB || user.port == id_CSA0 || user.port == id_CSA1 ||
user.port == id_CSA2 || user.port == id_CSB0 || user.port == id_CSB1 || user.port == id_CSB2) {
// Connect to CIB CLK, LSR or CE. Default state is 1
uc->params[ctx->id(user.port.str(ctx) + "MUX")] = constval ? user.port.str(ctx) : "INV";
} else {
// Connected to CIB ABCD. Default state is bitstream configurable
uc->params[ctx->id(user.port.str(ctx) + "MUX")] = std::string(constval ? "1" : "0");
}
uc->ports[user.port].net = nullptr;
} else if (uc->type == id_ALU54B || uc->type == id_MULT18X18D) {
if (user.port.str(ctx).substr(0, 3) == "CLK" || user.port.str(ctx).substr(0, 2) == "CE" ||
user.port.str(ctx).substr(0, 3) == "RST" || user.port.str(ctx).substr(0, 3) == "SRO" ||
user.port.str(ctx).substr(0, 3) == "SRI" || user.port.str(ctx).substr(0, 2) == "RO" ||
user.port.str(ctx).substr(0, 2) == "MA" || user.port.str(ctx).substr(0, 2) == "MB" ||
user.port.str(ctx).substr(0, 3) == "CFB" || user.port.str(ctx).substr(0, 3) == "CIN" ||
user.port.str(ctx).substr(0, 6) == "SOURCE" || user.port.str(ctx).substr(0, 6) == "SIGNED" ||
user.port.str(ctx).substr(0, 2) == "OP") {
uc->ports[user.port].net = constnet;
constnet->users.push_back(user);
} else {
// Connected to CIB ABCD. Default state is bitstream configurable
uc->params[ctx->id(user.port.str(ctx) + "MUX")] = std::string(constval ? "1" : "0");
uc->ports[user.port].net = nullptr;
}
} else {
uc->ports[user.port].net = constnet;
constnet->users.push_back(user);
}
}
}
orig->users.clear();
}
// Pack constants (simple implementation)
void pack_constants()
{
log_info("Packing constants..\n");
std::unique_ptr<CellInfo> gnd_cell = create_ecp5_cell(ctx, ctx->id("LUT4"), "$PACKER_GND");
gnd_cell->params[ctx->id("INIT")] = Property(0, 16);
std::unique_ptr<NetInfo> gnd_net = std::unique_ptr<NetInfo>(new NetInfo);
gnd_net->name = ctx->id("$PACKER_GND_NET");
gnd_net->driver.cell = gnd_cell.get();
gnd_net->driver.port = ctx->id("Z");
gnd_cell->ports.at(ctx->id("Z")).net = gnd_net.get();
std::unique_ptr<CellInfo> vcc_cell = create_ecp5_cell(ctx, ctx->id("LUT4"), "$PACKER_VCC");
vcc_cell->params[ctx->id("INIT")] = Property(65535, 16);
std::unique_ptr<NetInfo> vcc_net = std::unique_ptr<NetInfo>(new NetInfo);
vcc_net->name = ctx->id("$PACKER_VCC_NET");
vcc_net->driver.cell = vcc_cell.get();
vcc_net->driver.port = ctx->id("Z");
vcc_cell->ports.at(ctx->id("Z")).net = vcc_net.get();
std::vector<IdString> dead_nets;
bool gnd_used = false, vcc_used = false;
for (auto net : sorted(ctx->nets)) {
NetInfo *ni = net.second;
if (ni->driver.cell != nullptr && ni->driver.cell->type == ctx->id("GND")) {
IdString drv_cell = ni->driver.cell->name;
set_net_constant(ctx, ni, gnd_net.get(), false);
gnd_used = true;
dead_nets.push_back(net.first);
ctx->cells.erase(drv_cell);
} else if (ni->driver.cell != nullptr && ni->driver.cell->type == ctx->id("VCC")) {
IdString drv_cell = ni->driver.cell->name;
set_net_constant(ctx, ni, vcc_net.get(), true);
vcc_used = true;
dead_nets.push_back(net.first);
ctx->cells.erase(drv_cell);
}
}
if (gnd_used) {
ctx->cells[gnd_cell->name] = std::move(gnd_cell);
ctx->nets[gnd_net->name] = std::move(gnd_net);
}
if (vcc_used) {
ctx->cells[vcc_cell->name] = std::move(vcc_cell);
ctx->nets[vcc_net->name] = std::move(vcc_net);
}
for (auto dn : dead_nets) {
ctx->nets.erase(dn);
}
}
void autocreate_empty_port(CellInfo *cell, IdString port)
{
if (!cell->ports.count(port)) {
cell->ports[port].name = port;
cell->ports[port].net = nullptr;
cell->ports[port].type = PORT_IN;
}
}
// Pack EBR
void pack_ebr()
{
// Autoincrement WID (starting from 3 seems to match vendor behaviour?)
int wid = 3;
auto rename_bus = [&](CellInfo *c, const std::string &oldname, const std::string &newname, int width,
int oldoffset, int newoffset) {
for (int i = 0; i < width; i++)
rename_port(ctx, c, ctx->id(oldname + std::to_string(i + oldoffset)),
ctx->id(newname + std::to_string(i + newoffset)));
};
auto rename_param = [&](CellInfo *c, const std::string &oldname, const std::string &newname) {
IdString o = ctx->id(oldname), n = ctx->id(newname);
if (!c->params.count(o))
return;
c->params[n] = c->params[o];
c->params.erase(o);
};
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
// Convert 36-bit PDP RAMs to regular 18-bit DP ones that match the Bel
if (ci->type == ctx->id("PDPW16KD")) {
ci->params[ctx->id("DATA_WIDTH_A")] = 36; // force PDP mode
ci->params.erase(ctx->id("DATA_WIDTH_W"));
rename_bus(ci, "BE", "ADA", 4, 0, 0);
rename_bus(ci, "ADW", "ADA", 9, 0, 5);
rename_bus(ci, "ADR", "ADB", 14, 0, 0);
rename_bus(ci, "CSW", "CSA", 3, 0, 0);
rename_bus(ci, "CSR", "CSB", 3, 0, 0);
rename_bus(ci, "DI", "DIA", 18, 0, 0);
rename_bus(ci, "DI", "DIB", 18, 18, 0);
rename_bus(ci, "DO", "DOA", 18, 18, 0);
rename_bus(ci, "DO", "DOB", 18, 0, 0);
rename_port(ctx, ci, ctx->id("CLKW"), ctx->id("CLKA"));
rename_port(ctx, ci, ctx->id("CLKR"), ctx->id("CLKB"));
rename_port(ctx, ci, ctx->id("CEW"), ctx->id("CEA"));
rename_port(ctx, ci, ctx->id("CER"), ctx->id("CEB"));
rename_port(ctx, ci, ctx->id("OCER"), ctx->id("OCEB"));
rename_param(ci, "CLKWMUX", "CLKAMUX");
if (str_or_default(ci->params, ctx->id("CLKAMUX")) == "CLKW")
ci->params[ctx->id("CLKAMUX")] = std::string("CLKA");
if (str_or_default(ci->params, ctx->id("CLKBMUX")) == "CLKR")
ci->params[ctx->id("CLKBMUX")] = std::string("CLKB");
rename_param(ci, "CLKRMUX", "CLKRMUX");
rename_param(ci, "CSDECODE_W", "CSDECODE_A");
rename_param(ci, "CSDECODE_R", "CSDECODE_B");
rename_param(ci, "REGMODE", "REGMODE_B");
rename_param(ci, "DATA_WIDTH_R", "DATA_WIDTH_B");
if (ci->ports.count(id_RST)) {
autocreate_empty_port(ci, id_RSTA);
autocreate_empty_port(ci, id_RSTB);
NetInfo *rst = ci->ports.at(id_RST).net;
connect_port(ctx, rst, ci, id_RSTA);
connect_port(ctx, rst, ci, id_RSTB);
disconnect_port(ctx, ci, id_RST);
ci->ports.erase(id_RST);
}
ci->type = id_DP16KD;
}
}
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_DP16KD) {
// Add ports, even if disconnected, to ensure correct tie-offs
for (int i = 0; i < 14; i++) {
autocreate_empty_port(ci, ctx->id("ADA" + std::to_string(i)));
autocreate_empty_port(ci, ctx->id("ADB" + std::to_string(i)));
}
for (int i = 0; i < 18; i++) {
autocreate_empty_port(ci, ctx->id("DIA" + std::to_string(i)));
autocreate_empty_port(ci, ctx->id("DIB" + std::to_string(i)));
}
for (int i = 0; i < 3; i++) {
autocreate_empty_port(ci, ctx->id("CSA" + std::to_string(i)));
autocreate_empty_port(ci, ctx->id("CSB" + std::to_string(i)));
}
for (int i = 0; i < 3; i++) {
autocreate_empty_port(ci, ctx->id("CSA" + std::to_string(i)));
autocreate_empty_port(ci, ctx->id("CSB" + std::to_string(i)));
}
autocreate_empty_port(ci, id_CLKA);
autocreate_empty_port(ci, id_CEA);
autocreate_empty_port(ci, id_OCEA);
autocreate_empty_port(ci, id_WEA);
autocreate_empty_port(ci, id_RSTA);
autocreate_empty_port(ci, id_CLKB);
autocreate_empty_port(ci, id_CEB);
autocreate_empty_port(ci, id_OCEB);
autocreate_empty_port(ci, id_WEB);
autocreate_empty_port(ci, id_RSTB);
ci->attrs[ctx->id("WID")] = wid++;
}
}
}
// Pack DSPs
void pack_dsps()
{
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_MULT18X18D) {
// Add ports, even if disconnected, to ensure correct tie-offs
for (auto sig : {"CLK", "CE", "RST"})
for (int i = 0; i < 4; i++)
autocreate_empty_port(ci, ctx->id(sig + std::to_string(i)));
for (auto sig : {"SIGNED", "SOURCE"})
for (auto c : {"A", "B"})
autocreate_empty_port(ci, ctx->id(sig + std::string(c)));
for (auto port : {"A", "B", "C"})
for (int i = 0; i < 18; i++)
autocreate_empty_port(ci, ctx->id(port + std::to_string(i)));
for (auto port : {"SRIA", "SRIB"})
for (int i = 0; i < 18; i++)
autocreate_empty_port(ci, ctx->id(port + std::to_string(i)));
} else if (ci->type == id_ALU54B) {
for (auto sig : {"CLK", "CE", "RST"})
for (int i = 0; i < 4; i++)
autocreate_empty_port(ci, ctx->id(sig + std::to_string(i)));
autocreate_empty_port(ci, id_SIGNEDIA);
autocreate_empty_port(ci, id_SIGNEDIB);
autocreate_empty_port(ci, id_SIGNEDCIN);
for (auto port : {"A", "B", "MA", "MB"})
for (int i = 0; i < 36; i++)
autocreate_empty_port(ci, ctx->id(port + std::to_string(i)));
for (auto port : {"C", "CFB", "CIN"})
for (int i = 0; i < 54; i++)
autocreate_empty_port(ci, ctx->id(port + std::to_string(i)));
for (int i = 0; i < 11; i++)
autocreate_empty_port(ci, ctx->id("OP" + std::to_string(i)));
}
}
}
// "Pack" DCUs
void pack_dcus()
{
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_DCUA) {
if (ci->attrs.count(ctx->id("LOC"))) {
std::string loc = ci->attrs.at(ctx->id("LOC")).as_string();
if (loc == "DCU0" &&
(ctx->args.type == ArchArgs::LFE5UM_25F || ctx->args.type == ArchArgs::LFE5UM5G_25F))
ci->attrs[ctx->id("BEL")] = std::string("X42/Y50/DCU");
else if (loc == "DCU0" &&
(ctx->args.type == ArchArgs::LFE5UM_45F || ctx->args.type == ArchArgs::LFE5UM5G_45F))
ci->attrs[ctx->id("BEL")] = std::string("X42/Y71/DCU");
else if (loc == "DCU1" &&
(ctx->args.type == ArchArgs::LFE5UM_45F || ctx->args.type == ArchArgs::LFE5UM5G_45F))
ci->attrs[ctx->id("BEL")] = std::string("X69/Y71/DCU");
else if (loc == "DCU0" &&
(ctx->args.type == ArchArgs::LFE5UM_85F || ctx->args.type == ArchArgs::LFE5UM5G_85F))
ci->attrs[ctx->id("BEL")] = std::string("X46/Y95/DCU");
else if (loc == "DCU1" &&
(ctx->args.type == ArchArgs::LFE5UM_85F || ctx->args.type == ArchArgs::LFE5UM5G_85F))
ci->attrs[ctx->id("BEL")] = std::string("X71/Y95/DCU");
else
log_error("no DCU location '%s' in device '%s'\n", loc.c_str(), ctx->getChipName().c_str());
}
if (!ci->attrs.count(ctx->id("BEL")))
log_error("DCU must be constrained to a Bel!\n");
// Empty port auto-creation to generate correct tie-downs
BelId exemplar_bel;
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) == id_DCUA) {
exemplar_bel = bel;
break;
}
}
NPNR_ASSERT(exemplar_bel != BelId());
for (auto pin : ctx->getBelPins(exemplar_bel))
if (ctx->getBelPinType(exemplar_bel, pin) == PORT_IN)
autocreate_empty_port(ci, pin);
}
}
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_EXTREFB) {
const NetInfo *refo = net_or_nullptr(ci, id_REFCLKO);
CellInfo *dcu = nullptr;
if (refo == nullptr)
log_error("EXTREFB REFCLKO must not be unconnected\n");
for (auto user : refo->users) {
if (user.cell->type != id_DCUA)
continue;
if (dcu != nullptr && dcu != user.cell)
log_error("EXTREFB REFCLKO must only drive a single DCUA\n");
dcu = user.cell;
}
if (!dcu->attrs.count(ctx->id("BEL")))
log_error("DCU must be constrained to a Bel!\n");
std::string bel = dcu->attrs.at(ctx->id("BEL")).as_string();
NPNR_ASSERT(bel.substr(bel.length() - 3) == "DCU");
bel.replace(bel.length() - 3, 3, "EXTREF");
ci->attrs[ctx->id("BEL")] = bel;
} else if (ci->type == id_PCSCLKDIV) {
const NetInfo *clki = net_or_nullptr(ci, id_CLKI);
if (clki != nullptr && clki->driver.cell != nullptr && clki->driver.cell->type == id_DCUA) {
CellInfo *dcu = clki->driver.cell;
if (!dcu->attrs.count(ctx->id("BEL")))
log_error("DCU must be constrained to a Bel!\n");
BelId bel = ctx->getBelByName(ctx->id(dcu->attrs.at(ctx->id("BEL")).as_string()));
if (bel == BelId())
log_error("Invalid DCU bel '%s'\n", dcu->attrs.at(ctx->id("BEL")).c_str());
Loc loc = ctx->getBelLocation(bel);
// DCU0 -> CLKDIV z=0; DCU1 -> CLKDIV z=1
ci->constr_abs_z = true;
ci->constr_z = (loc.x >= 69) ? 1 : 0;
}
}
}
}
// Miscellaneous packer tasks
void pack_misc()
{
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_USRMCLK) {
rename_port(ctx, ci, ctx->id("USRMCLKI"), id_PADDO);
rename_port(ctx, ci, ctx->id("USRMCLKTS"), id_PADDT);
rename_port(ctx, ci, ctx->id("USRMCLKO"), id_PADDI);
} else if (ci->type == id_GSR || ci->type == ctx->id("SGSR")) {
ci->params[ctx->id("MODE")] = std::string("ACTIVE_LOW");
ci->params[ctx->id("SYNCMODE")] =
ci->type == ctx->id("SGSR") ? std::string("SYNC") : std::string("ASYNC");
ci->type = id_GSR;
for (BelId bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_GSR)
continue;
ci->attrs[ctx->id("BEL")] = ctx->getBelName(bel).str(ctx);
ctx->gsrclk_wire = ctx->getBelPinWire(bel, id_CLK);
}
}
}
}
// Preplace PLL
void preplace_plls()
{
std::set<BelId> available_plls;
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) == id_EHXPLLL && ctx->checkBelAvail(bel))
available_plls.insert(bel);
}
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_EHXPLLL && ci->attrs.count(ctx->id("BEL")))
available_plls.erase(ctx->getBelByName(ctx->id(ci->attrs.at(ctx->id("BEL")).as_string())));
}
// Place PLL connected to fixed drivers such as IO close to their source
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_EHXPLLL && !ci->attrs.count(ctx->id("BEL"))) {
const NetInfo *drivernet = net_or_nullptr(ci, id_CLKI);
if (drivernet == nullptr || drivernet->driver.cell == nullptr)
continue;
const CellInfo *drivercell = drivernet->driver.cell;
if (!drivercell->attrs.count(ctx->id("BEL")))
continue;
BelId drvbel = ctx->getBelByName(ctx->id(drivercell->attrs.at(ctx->id("BEL")).as_string()));
Loc drvloc = ctx->getBelLocation(drvbel);
BelId closest_pll;
int closest_distance = std::numeric_limits<int>::max();
for (auto bel : available_plls) {
Loc pllloc = ctx->getBelLocation(bel);
int distance = std::abs(drvloc.x - pllloc.x) + std::abs(drvloc.y - pllloc.y);
if (distance < closest_distance) {
closest_pll = bel;
closest_distance = distance;
}
}
if (closest_pll == BelId())
log_error("failed to place PLL '%s'\n", ci->name.c_str(ctx));
available_plls.erase(closest_pll);
ci->attrs[ctx->id("BEL")] = ctx->getBelName(closest_pll).str(ctx);
}
}
// Place PLLs driven by logic, etc, randomly
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_EHXPLLL && !ci->attrs.count(ctx->id("BEL"))) {
if (available_plls.empty())
log_error("failed to place PLL '%s'\n", ci->name.c_str(ctx));
BelId next_pll = *(available_plls.begin());
available_plls.erase(next_pll);
ci->attrs[ctx->id("BEL")] = ctx->getBelName(next_pll).str(ctx);
}
}
}
// Check if two nets have identical constant drivers
bool equal_constant(NetInfo *a, NetInfo *b)
{
if (a->driver.cell == nullptr || b->driver.cell == nullptr)
return (a->driver.cell == nullptr && b->driver.cell == nullptr);
if (a->driver.cell->type != ctx->id("GND") && a->driver.cell->type != ctx->id("VCC"))
return false;
return a->driver.cell->type == b->driver.cell->type;
}
struct EdgeClockInfo
{
CellInfo *buffer = nullptr;
NetInfo *unbuf = nullptr;
NetInfo *buf = nullptr;
};
std::map<std::pair<int, int>, EdgeClockInfo> eclks;
std::map<NetInfo *, int> bridge_side_hint;
void make_eclk(PortInfo &usr_port, CellInfo *usr_cell, BelId usr_bel, int bank)
{
NetInfo *ecknet = usr_port.net;
if (ecknet == nullptr)
log_error("Input '%s' of cell '%s' cannot be disconnected\n", usr_port.name.c_str(ctx),
usr_cell->name.c_str(ctx));
int found_eclk = -1, free_eclk = -1;
for (int i = 0; i < 2; i++) {
if (eclks.count(std::make_pair(bank, i))) {
if (eclks.at(std::make_pair(bank, i)).unbuf == ecknet) {
found_eclk = i;
break;
}
} else if (free_eclk == -1) {
if (bridge_side_hint.count(ecknet) && bridge_side_hint.at(ecknet) != i)
continue;
free_eclk = i;
}
}
if (found_eclk == -1) {
if (free_eclk == -1) {
log_error("Unable to promote edge clock '%s' for bank %d. 2/2 edge clocks already used by '%s' and "
"'%s'.\n",
ecknet->name.c_str(ctx), bank, eclks.at(std::make_pair(bank, 0)).unbuf->name.c_str(ctx),
eclks.at(std::make_pair(bank, 1)).unbuf->name.c_str(ctx));
} else {
log_info("Promoted '%s' to bank %d ECLK%d.\n", ecknet->name.c_str(ctx), bank, free_eclk);
auto &eclk = eclks[std::make_pair(bank, free_eclk)];
eclk.unbuf = ecknet;
IdString eckname = ctx->id(ecknet->name.str(ctx) + "$eclk" + std::to_string(bank) + "_" +
std::to_string(free_eclk));
std::unique_ptr<NetInfo> promoted_ecknet(new NetInfo);
promoted_ecknet->name = eckname;
promoted_ecknet->attrs[ctx->id("ECP5_IS_GLOBAL")] = 1; // Prevents router etc touching this special net
eclk.buf = promoted_ecknet.get();
NPNR_ASSERT(!ctx->nets.count(eckname));
ctx->nets[eckname] = std::move(promoted_ecknet);
// Insert TRELLIS_ECLKBUF to isolate edge clock from general routing
std::unique_ptr<CellInfo> eclkbuf =
create_ecp5_cell(ctx, id_TRELLIS_ECLKBUF, eckname.str(ctx) + "$buffer");
BelId target_bel;
// Find the correct Bel for the ECLKBUF
IdString eclkname = ctx->id("G_BANK" + std::to_string(bank) + "ECLK" + std::to_string(free_eclk));
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_TRELLIS_ECLKBUF)
continue;
if (ctx->getWireBasename(ctx->getBelPinWire(bel, id_ECLKO)) != eclkname)
continue;
target_bel = bel;
break;
}
NPNR_ASSERT(target_bel != BelId());
eclkbuf->attrs[ctx->id("BEL")] = ctx->getBelName(target_bel).str(ctx);
connect_port(ctx, ecknet, eclkbuf.get(), id_ECLKI);
connect_port(ctx, eclk.buf, eclkbuf.get(), id_ECLKO);
found_eclk = free_eclk;
eclk.buffer = eclkbuf.get();
new_cells.push_back(std::move(eclkbuf));
}
}
auto &eclk = eclks[std::make_pair(bank, found_eclk)];
disconnect_port(ctx, usr_cell, usr_port.name);
usr_port.net = nullptr;
connect_port(ctx, eclk.buf, usr_cell, usr_port.name);
// Simple ECLK router
WireId userWire = ctx->getBelPinWire(usr_bel, usr_port.name);
IdString bnke_name = ctx->id("BNK_ECLK" + std::to_string(found_eclk));
IdString global_name = ctx->id("G_BANK" + std::to_string(bank) + "ECLK" + std::to_string(found_eclk));
std::queue<WireId> upstream;
std::unordered_map<WireId, PipId> backtrace;
upstream.push(userWire);
WireId next;
while (true) {
if (upstream.empty() || upstream.size() > 30000)
log_error("failed to route bank %d ECLK%d to %s.%s\n", bank, found_eclk,
ctx->getBelName(usr_bel).c_str(ctx), usr_port.name.c_str(ctx));
next = upstream.front();
upstream.pop();
if (ctx->debug)
log_info(" visited %s\n", ctx->getWireName(next).c_str(ctx));
IdString basename = ctx->getWireBasename(next);
if (basename == bnke_name || basename == global_name) {
break;
}
if (ctx->checkWireAvail(next)) {
for (auto pip : ctx->getPipsUphill(next)) {
WireId src = ctx->getPipSrcWire(pip);
backtrace[src] = pip;
upstream.push(src);
}
}
}
// Set all the pips we found along the way
WireId cursor = next;
while (true) {
auto fnd = backtrace.find(cursor);
if (fnd == backtrace.end())
break;
ctx->bindPip(fnd->second, eclk.buf, STRENGTH_LOCKED);
cursor = ctx->getPipDstWire(fnd->second);
}
}
void tie_zero(CellInfo *ci, IdString port)
{
if (!ci->ports.count(port)) {
ci->ports[port].name = port;
ci->ports[port].type = PORT_IN;
}
std::unique_ptr<CellInfo> zero_cell{new CellInfo};
std::unique_ptr<NetInfo> zero_net{new NetInfo};
IdString name = ctx->id(ci->name.str(ctx) + "$zero$" + port.str(ctx));
zero_cell->type = ctx->id("GND");
zero_cell->name = name;
zero_net->name = name;
zero_cell->ports[ctx->id("GND")].type = PORT_OUT;
connect_port(ctx, zero_net.get(), zero_cell.get(), ctx->id("GND"));
connect_port(ctx, zero_net.get(), ci, port);
ctx->nets[name] = std::move(zero_net);
new_cells.push_back(std::move(zero_cell));
}
std::unordered_map<IdString, std::pair<bool, int>> dqsbuf_dqsg;
// Pack DQSBUFs
void pack_dqsbuf()
{
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_DQSBUFM) {
CellInfo *pio = net_driven_by(ctx, ci->ports.at(ctx->id("DQSI")).net, is_trellis_io, id_O);
if (pio == nullptr || ci->ports.at(ctx->id("DQSI")).net->users.size() > 1)
log_error("DQSBUFM '%s' DQSI input must be connected only to a top level input\n",
ci->name.c_str(ctx));
if (!pio->attrs.count(ctx->id("BEL")))
log_error("DQSBUFM can only be used with a pin-constrained PIO connected to its DQSI input"
"(while processing '%s').\n",
ci->name.c_str(ctx));
BelId pio_bel = ctx->getBelByName(ctx->id(pio->attrs.at(ctx->id("BEL")).as_string()));
NPNR_ASSERT(pio_bel != BelId());
Loc pio_loc = ctx->getBelLocation(pio_bel);
if (pio_loc.z != 0)
log_error("PIO '%s' does not appear to be a DQS site (expecting an 'A' pin).\n",
ctx->getBelName(pio_bel).c_str(ctx));
pio_loc.z = 8;
BelId dqsbuf = ctx->getBelByLocation(pio_loc);
if (dqsbuf == BelId() || ctx->getBelType(dqsbuf) != id_DQSBUFM)
log_error("PIO '%s' does not appear to be a DQS site (didn't find a DQSBUFM).\n",
ctx->getBelName(pio_bel).c_str(ctx));
ci->attrs[ctx->id("BEL")] = ctx->getBelName(dqsbuf).str(ctx);
bool got_dqsg = ctx->getPIODQSGroup(pio_bel, dqsbuf_dqsg[ci->name].first, dqsbuf_dqsg[ci->name].second);
NPNR_ASSERT(got_dqsg);
log_info("Constrained DQSBUFM '%s' to %cDQS%d\n", ci->name.c_str(ctx),
dqsbuf_dqsg[ci->name].first ? 'R' : 'L', dqsbuf_dqsg[ci->name].second);
// Set all special ports, if used as 'globals' that the router won't touch
for (auto port : {id_DQSR90, id_RDPNTR0, id_RDPNTR1, id_RDPNTR2, id_WRPNTR0, id_WRPNTR1, id_WRPNTR2,
id_DQSW270, id_DQSW}) {
if (!ci->ports.count(port))
continue;
NetInfo *pn = ci->ports.at(port).net;
if (pn == nullptr)
continue;
for (auto &usr : pn->users) {
if (usr.port != port ||
(usr.cell->type != ctx->id("ODDRX2DQA") && usr.cell->type != ctx->id("ODDRX2DQSB") &&
usr.cell->type != ctx->id("TSHX2DQSA") && usr.cell->type != ctx->id("IDDRX2DQA") &&
usr.cell->type != ctx->id("TSHX2DQA") && usr.cell->type != id_IOLOGIC))
log_error("Port '%s' of DQSBUFM '%s' cannot drive port '%s' of cell '%s'.\n",
port.c_str(ctx), ci->name.c_str(ctx), usr.port.c_str(ctx),
usr.cell->name.c_str(ctx));
}
pn->attrs[ctx->id("ECP5_IS_GLOBAL")] = 1;
}
for (auto zport :
{id_RDMOVE, id_RDDIRECTION, id_WRMOVE, id_WRDIRECTION, id_READ0, id_READ1, id_READCLKSEL0,
id_READCLKSEL1, id_READCLKSEL2, id_DYNDELAY0, id_DYNDELAY1, id_DYNDELAY2, id_DYNDELAY3,
id_DYNDELAY4, id_DYNDELAY5, id_DYNDELAY6, id_DYNDELAY7}) {
if (net_or_nullptr(ci, zport) == nullptr)
tie_zero(ci, zport);
}
}
}
}
int lookup_delay(const std::string &del_mode)
{
if (del_mode == "USER_DEFINED")
return 0;
else if (del_mode == "DQS_ALIGNED_X2")
return 6;
else if (del_mode == "DQS_CMD_CLK")
return 9;
else if (del_mode == "ECLK_ALIGNED")
return 21;
else if (del_mode == "ECLK_CENTERED")
return 11;
else if (del_mode == "ECLKBRIDGE_ALIGNED")
return 39;
else if (del_mode == "ECLKBRIDGE_CENTERED")
return 29;
else if (del_mode == "SCLK_ALIGNED")
return 50;
else if (del_mode == "SCLK_CENTERED")
return 39;
else if (del_mode == "SCLK_ZEROHOLD")
return 59;
else
log_error("Unsupported DEL_MODE '%s'\n", del_mode.c_str());
}
// Pack IOLOGIC
void pack_iologic()
{
std::unordered_map<IdString, CellInfo *> pio_iologic;
auto set_iologic_sclk = [&](CellInfo *iol, CellInfo *prim, IdString port, bool input) {
NetInfo *sclk = nullptr;
if (prim->ports.count(port))
sclk = prim->ports[port].net;
if (sclk == nullptr) {
iol->params[input ? ctx->id("CLKIMUX") : ctx->id("CLKOMUX")] = std::string("0");
} else {
iol->params[input ? ctx->id("CLKIMUX") : ctx->id("CLKOMUX")] = std::string("CLK");
if (iol->ports[id_CLK].net != nullptr) {
if (iol->ports[id_CLK].net != sclk && !equal_constant(iol->ports[id_CLK].net, sclk))
log_error("IOLOGIC '%s' has conflicting clocks '%s' and '%s'\n", iol->name.c_str(ctx),
iol->ports[id_CLK].net->name.c_str(ctx), sclk->name.c_str(ctx));
} else {
connect_port(ctx, sclk, iol, id_CLK);
}
}
if (prim->ports.count(port))
disconnect_port(ctx, prim, port);
};
auto set_iologic_eclk = [&](CellInfo *iol, CellInfo *prim, IdString port) {
NetInfo *eclk = nullptr;
if (prim->ports.count(port))
eclk = prim->ports[port].net;
if (eclk == nullptr)
log_error("%s '%s' cannot have disconnected ECLK", prim->type.c_str(ctx), prim->name.c_str(ctx));
if (iol->ports[id_ECLK].net != nullptr) {
if (iol->ports[id_ECLK].net != eclk)
log_error("IOLOGIC '%s' has conflicting ECLKs '%s' and '%s'\n", iol->name.c_str(ctx),
iol->ports[id_ECLK].net->name.c_str(ctx), eclk->name.c_str(ctx));
} else {
connect_port(ctx, eclk, iol, id_ECLK);
}
if (prim->ports.count(port))
disconnect_port(ctx, prim, port);
};
auto set_iologic_lsr = [&](CellInfo *iol, CellInfo *prim, IdString port, bool input) {
NetInfo *lsr = nullptr;
if (prim->ports.count(port))
lsr = prim->ports[port].net;
if (lsr == nullptr) {
iol->params[input ? ctx->id("LSRIMUX") : ctx->id("LSROMUX")] = std::string("0");
} else {
iol->params[input ? ctx->id("LSRIMUX") : ctx->id("LSROMUX")] = std::string("LSRMUX");
if (iol->ports[id_LSR].net != nullptr && !equal_constant(iol->ports[id_LSR].net, lsr)) {
if (iol->ports[id_LSR].net != lsr)
log_error("IOLOGIC '%s' has conflicting LSR signals '%s' and '%s'\n", iol->name.c_str(ctx),
iol->ports[id_LSR].net->name.c_str(ctx), lsr->name.c_str(ctx));
} else if (iol->ports[id_LSR].net == nullptr) {
connect_port(ctx, lsr, iol, id_LSR);
}
}
if (prim->ports.count(port))
disconnect_port(ctx, prim, port);
};
auto set_iologic_mode = [&](CellInfo *iol, std::string mode) {
auto &curr_mode = iol->params[ctx->id("MODE")].str;
if (curr_mode != "NONE" && mode == "IREG_OREG")
return;
if (curr_mode != "NONE" && curr_mode != "IREG_OREG" && curr_mode != mode)
log_error("IOLOGIC '%s' has conflicting modes '%s' and '%s'\n", iol->name.c_str(ctx), curr_mode.c_str(),
mode.c_str());
if (iol->type == id_SIOLOGIC && mode != "IREG_OREG" && mode != "IDDRX1_ODDRX1" && mode != "NONE")
log_error("IOLOGIC '%s' is set to mode '%s', but this is only supported for left and right IO\n",
iol->name.c_str(ctx), mode.c_str());
curr_mode = mode;
};
auto get_pio_bel = [&](CellInfo *pio, CellInfo *curr) {
if (!pio->attrs.count(ctx->id("BEL")))
log_error("IOLOGIC functionality (DDR, DELAY, DQS, etc) can only be used with pin-constrained PIO "
"(while processing '%s').\n",
curr->name.c_str(ctx));
BelId bel = ctx->getBelByName(ctx->id(pio->attrs.at(ctx->id("BEL")).as_string()));
NPNR_ASSERT(bel != BelId());
return bel;
};
auto create_pio_iologic = [&](CellInfo *pio, CellInfo *curr) {
BelId bel = get_pio_bel(pio, curr);
log_info("IOLOGIC component %s connected to PIO Bel %s\n", curr->name.c_str(ctx),
ctx->getBelName(bel).c_str(ctx));
Loc loc = ctx->getBelLocation(bel);
bool s = false;
if (loc.y == 0 || loc.y == (ctx->chip_info->height - 1))
s = true;
std::unique_ptr<CellInfo> iol =
create_ecp5_cell(ctx, s ? id_SIOLOGIC : id_IOLOGIC, pio->name.str(ctx) + "$IOL");
loc.z += s ? 2 : 4;
iol->attrs[ctx->id("BEL")] = ctx->getBelName(ctx->getBelByLocation(loc)).str(ctx);
CellInfo *iol_ptr = iol.get();
pio_iologic[pio->name] = iol_ptr;
new_cells.push_back(std::move(iol));
return iol_ptr;
};
auto process_dqs_port = [&](CellInfo *prim, CellInfo *pio, CellInfo *iol, IdString port) {
NetInfo *sig = nullptr;
if (prim->ports.count(port))
sig = prim->ports[port].net;
if (sig == nullptr || sig->driver.cell == nullptr)
log_error("Port %s of cell '%s' cannot be disconnected, it must be driven by a DQSBUFM\n",
port.c_str(ctx), prim->name.c_str(ctx));
if (iol->ports.at(port).net != nullptr) {
if (iol->ports.at(port).net != sig) {
log_error("IOLOGIC '%s' has conflicting %s signals '%s' and '%s'\n", iol->name.c_str(ctx),
port.c_str(ctx), iol->ports[port].net->name.c_str(ctx), sig->name.c_str(ctx));
}
disconnect_port(ctx, prim, port);
} else {
bool dqsr;
int dqsgroup;
bool has_dqs = ctx->getPIODQSGroup(get_pio_bel(pio, prim), dqsr, dqsgroup);
if (!has_dqs)
log_error("Primitive '%s' cannot be connected to top level port '%s' as the associated pin is not "
"in any DQS group",
prim->name.c_str(ctx), pio->name.c_str(ctx));
if (sig->driver.cell->type != id_DQSBUFM || sig->driver.port != port)
log_error("Port %s of cell '%s' must be driven by port %s of a DQSBUFM", port.c_str(ctx),
prim->name.c_str(ctx), port.c_str(ctx));
auto &driver_group = dqsbuf_dqsg.at(sig->driver.cell->name);
if (driver_group.first != dqsr || driver_group.second != dqsgroup)
log_error("DQS group mismatch, port %s of '%s' in group %cDQ%d is driven by DQSBUFM '%s' in group "
"%cDQ%d\n",
port.c_str(ctx), prim->name.c_str(ctx), dqsr ? 'R' : 'L', dqsgroup,
sig->driver.cell->name.c_str(ctx), driver_group.first ? 'R' : 'L', driver_group.second);
replace_port(prim, port, iol, port);
}
};
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == ctx->id("DELAYF") || ci->type == ctx->id("DELAYG")) {
CellInfo *i_pio = net_driven_by(ctx, ci->ports.at(ctx->id("A")).net, is_trellis_io, id_O);
CellInfo *o_pio = net_only_drives(ctx, ci->ports.at(ctx->id("Z")).net, is_trellis_io, id_I, true);
CellInfo *iol = nullptr;
if (i_pio != nullptr && ci->ports.at(ctx->id("A")).net->users.size() == 1) {
iol = create_pio_iologic(i_pio, ci);
set_iologic_mode(iol, "IREG_OREG");
bool drives_iologic = false;
for (auto user : ci->ports.at(ctx->id("Z")).net->users)
if (is_iologic_input_cell(ctx, user.cell) && user.port == ctx->id("D"))
drives_iologic = true;
if (drives_iologic) {
// Reconnect to PIO which the packer expects later on
NetInfo *input_net = ci->ports.at(ctx->id("A")).net, *dly_net = ci->ports.at(ctx->id("Z")).net;
disconnect_port(ctx, i_pio, id_O);
i_pio->ports.at(id_O).net = nullptr;
disconnect_port(ctx, ci, id_A);
ci->ports.at(id_A).net = nullptr;
disconnect_port(ctx, ci, id_Z);
ci->ports.at(id_Z).net = nullptr;
connect_port(ctx, dly_net, i_pio, id_O);
connect_port(ctx, input_net, iol, id_INDD);
connect_port(ctx, input_net, iol, id_DI);
} else {
replace_port(ci, id_A, iol, id_PADDI);
replace_port(ci, id_Z, iol, id_INDD);
}
packed_cells.insert(cell.first);
} else if (o_pio != nullptr) {
iol = create_pio_iologic(o_pio, ci);
iol->params[ctx->id("DELAY.OUTDEL")] = std::string("ENABLED");
bool driven_by_iol = false;
NetInfo *input_net = ci->ports.at(ctx->id("A")).net, *dly_net = ci->ports.at(ctx->id("Z")).net;
if (input_net->driver.cell != nullptr && is_iologic_output_cell(ctx, input_net->driver.cell) &&
input_net->driver.port == ctx->id("Q"))
driven_by_iol = true;
if (driven_by_iol) {
disconnect_port(ctx, o_pio, id_I);
o_pio->ports.at(id_I).net = nullptr;
disconnect_port(ctx, ci, id_A);
ci->ports.at(id_A).net = nullptr;
disconnect_port(ctx, ci, id_Z);
ci->ports.at(id_Z).net = nullptr;
connect_port(ctx, input_net, o_pio, id_I);
ctx->nets.erase(dly_net->name);
} else {
replace_port(ci, ctx->id("A"), iol, id_TXDATA0);
replace_port(ci, ctx->id("Z"), iol, id_IOLDO);
if (!o_pio->ports.count(id_IOLDO)) {
o_pio->ports[id_IOLDO].name = id_IOLDO;
o_pio->ports[id_IOLDO].type = PORT_IN;
}
replace_port(o_pio, id_I, o_pio, id_IOLDO);
}
packed_cells.insert(cell.first);
} else {
log_error("%s '%s' must be connected directly to top level input or output\n", ci->type.c_str(ctx),
ci->name.c_str(ctx));
}
iol->params[ctx->id("DELAY.DEL_VALUE")] =
lookup_delay(str_or_default(ci->params, ctx->id("DEL_MODE"), "USER_DEFINED"));
if (ci->params.count(ctx->id("DEL_VALUE")) &&
(!ci->params.at(ctx->id("DEL_VALUE")).is_string ||
std::string(ci->params.at(ctx->id("DEL_VALUE")).as_string()).substr(0, 5) != "DELAY"))
iol->params[ctx->id("DELAY.DEL_VALUE")] = ci->params.at(ctx->id("DEL_VALUE"));
if (ci->ports.count(id_LOADN))
replace_port(ci, id_LOADN, iol, id_LOADN);
else
tie_zero(ci, id_LOADN);
if (ci->ports.count(id_MOVE))
replace_port(ci, id_MOVE, iol, id_MOVE);
else
tie_zero(ci, id_MOVE);
if (ci->ports.count(id_DIRECTION))
replace_port(ci, id_DIRECTION, iol, id_DIRECTION);
else
tie_zero(ci, id_DIRECTION);
if (ci->ports.count(id_CFLAG))
replace_port(ci, id_CFLAG, iol, id_CFLAG);
}
}
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == ctx->id("IDDRX1F")) {
CellInfo *pio = net_driven_by(ctx, ci->ports.at(ctx->id("D")).net, is_trellis_io, id_O);
if (pio == nullptr || ci->ports.at(ctx->id("D")).net->users.size() > 1)
log_error("IDDRX1F '%s' D input must be connected only to a top level input\n",
ci->name.c_str(ctx));
CellInfo *iol;
if (pio_iologic.count(pio->name))
iol = pio_iologic.at(pio->name);
else
iol = create_pio_iologic(pio, ci);
set_iologic_mode(iol, "IDDRX1_ODDRX1");
replace_port(ci, ctx->id("D"), iol, id_PADDI);
set_iologic_sclk(iol, ci, ctx->id("SCLK"), true);
set_iologic_lsr(iol, ci, ctx->id("RST"), true);
replace_port(ci, ctx->id("Q0"), iol, id_RXDATA0);
replace_port(ci, ctx->id("Q1"), iol, id_RXDATA1);
iol->params[ctx->id("GSR")] = str_or_default(ci->params, ctx->id("GSR"), "DISABLED");
packed_cells.insert(cell.first);
} else if (ci->type == ctx->id("ODDRX1F")) {
CellInfo *pio = net_only_drives(ctx, ci->ports.at(ctx->id("Q")).net, is_trellis_io, id_I, true);
if (pio == nullptr)
log_error("ODDRX1F '%s' Q output must be connected only to a top level output\n",
ci->name.c_str(ctx));
CellInfo *iol;
if (pio_iologic.count(pio->name))
iol = pio_iologic.at(pio->name);
else
iol = create_pio_iologic(pio, ci);
set_iologic_mode(iol, "IDDRX1_ODDRX1");
replace_port(ci, ctx->id("Q"), iol, id_IOLDO);
if (!pio->ports.count(id_IOLDO)) {
pio->ports[id_IOLDO].name = id_IOLDO;
pio->ports[id_IOLDO].type = PORT_IN;
}
replace_port(pio, id_I, pio, id_IOLDO);
pio->params[ctx->id("DATAMUX_ODDR")] = std::string("IOLDO");
set_iologic_sclk(iol, ci, ctx->id("SCLK"), false);
set_iologic_lsr(iol, ci, ctx->id("RST"), false);
replace_port(ci, ctx->id("D0"), iol, id_TXDATA0);
replace_port(ci, ctx->id("D1"), iol, id_TXDATA1);
iol->params[ctx->id("GSR")] = str_or_default(ci->params, ctx->id("GSR"), "DISABLED");
packed_cells.insert(cell.first);
} else if (ci->type == ctx->id("ODDRX2F") || ci->type == ctx->id("ODDR71B")) {
CellInfo *pio = net_only_drives(ctx, ci->ports.at(ctx->id("Q")).net, is_trellis_io, id_I, true);
if (pio == nullptr)
log_error("%s '%s' Q output must be connected only to a top level output\n", ci->type.c_str(ctx),
ci->name.c_str(ctx));
CellInfo *iol;
if (pio_iologic.count(pio->name))
iol = pio_iologic.at(pio->name);
else
iol = create_pio_iologic(pio, ci);
set_iologic_mode(iol, "ODDRXN");
replace_port(ci, ctx->id("Q"), iol, id_IOLDO);
if (!pio->ports.count(id_IOLDO)) {
pio->ports[id_IOLDO].name = id_IOLDO;
pio->ports[id_IOLDO].type = PORT_IN;
}
replace_port(pio, id_I, pio, id_IOLDO);
set_iologic_sclk(iol, ci, ctx->id("SCLK"), false);
set_iologic_sclk(iol, ci, ctx->id("SCLK"), true);
set_iologic_eclk(iol, ci, id_ECLK);
set_iologic_lsr(iol, ci, ctx->id("RST"), false);
set_iologic_lsr(iol, ci, ctx->id("RST"), true);
replace_port(ci, ctx->id("D0"), iol, id_TXDATA0);
replace_port(ci, ctx->id("D1"), iol, id_TXDATA1);
replace_port(ci, ctx->id("D2"), iol, id_TXDATA2);
replace_port(ci, ctx->id("D3"), iol, id_TXDATA3);
if (ci->type == ctx->id("ODDR71B")) {
Loc loc =
ctx->getBelLocation(ctx->getBelByName(ctx->id(pio->attrs.at(ctx->id("BEL")).as_string())));
if (loc.z % 2 == 1)
log_error("ODDR71B '%s' can only be used at 'A' or 'C' locations\n", ci->name.c_str(ctx));
replace_port(ci, ctx->id("D4"), iol, id_TXDATA4);
replace_port(ci, ctx->id("D5"), iol, id_TXDATA5);
replace_port(ci, ctx->id("D6"), iol, id_TXDATA6);
iol->params[ctx->id("ODDRXN.MODE")] = std::string("ODDR71");
} else {
iol->params[ctx->id("ODDRXN.MODE")] = std::string("ODDRX2");
}
iol->params[ctx->id("GSR")] = str_or_default(ci->params, ctx->id("GSR"), "DISABLED");
pio->params[ctx->id("DATAMUX_ODDR")] = std::string("IOLDO");
packed_cells.insert(cell.first);
} else if (ci->type == ctx->id("IDDRX2F") || ci->type == ctx->id("IDDR71B")) {
CellInfo *pio = net_driven_by(ctx, ci->ports.at(ctx->id("D")).net, is_trellis_io, id_O);
if (pio == nullptr || ci->ports.at(ctx->id("D")).net->users.size() > 1)
log_error("%s '%s' D input must be connected only to a top level input\n", ci->type.c_str(ctx),
ci->name.c_str(ctx));
CellInfo *iol;
if (pio_iologic.count(pio->name))
iol = pio_iologic.at(pio->name);
else
iol = create_pio_iologic(pio, ci);
set_iologic_mode(iol, "IDDRXN");
replace_port(ci, ctx->id("D"), iol, id_PADDI);
set_iologic_sclk(iol, ci, ctx->id("SCLK"), true);
set_iologic_eclk(iol, ci, id_ECLK);
set_iologic_lsr(iol, ci, ctx->id("RST"), true);
replace_port(ci, ctx->id("Q0"), iol, id_RXDATA0);
replace_port(ci, ctx->id("Q1"), iol, id_RXDATA1);
replace_port(ci, ctx->id("Q2"), iol, id_RXDATA2);
replace_port(ci, ctx->id("Q3"), iol, id_RXDATA3);
if (ci->type == ctx->id("IDDR71B")) {
Loc loc =
ctx->getBelLocation(ctx->getBelByName(ctx->id(pio->attrs.at(ctx->id("BEL")).as_string())));
if (loc.z % 2 == 1)
log_error("IDDR71B '%s' can only be used at 'A' or 'C' locations\n", ci->name.c_str(ctx));
replace_port(ci, ctx->id("Q4"), iol, id_RXDATA4);
replace_port(ci, ctx->id("Q5"), iol, id_RXDATA5);
replace_port(ci, ctx->id("Q6"), iol, id_RXDATA6);
replace_port(ci, ctx->id("ALIGNWD"), iol, id_SLIP);
iol->params[ctx->id("IDDRXN.MODE")] = std::string("IDDR71");
} else {
iol->params[ctx->id("IDDRXN.MODE")] = std::string("IDDRX2");
}
iol->params[ctx->id("GSR")] = str_or_default(ci->params, ctx->id("GSR"), "DISABLED");
packed_cells.insert(cell.first);
} else if (ci->type == ctx->id("OSHX2A")) {
CellInfo *pio = net_only_drives(ctx, ci->ports.at(ctx->id("Q")).net, is_trellis_io, id_I, true);
if (pio == nullptr)
log_error("OSHX2A '%s' Q output must be connected only to a top level output\n",
ci->name.c_str(ctx));
CellInfo *iol;
if (pio_iologic.count(pio->name))
iol = pio_iologic.at(pio->name);
else
iol = create_pio_iologic(pio, ci);
set_iologic_mode(iol, "MIDDRX_MODDRX");
replace_port(ci, ctx->id("Q"), iol, id_IOLDO);
if (!pio->ports.count(id_IOLDO)) {
pio->ports[id_IOLDO].name = id_IOLDO;
pio->ports[id_IOLDO].type = PORT_IN;
}
replace_port(pio, id_I, pio, id_IOLDO);
set_iologic_sclk(iol, ci, ctx->id("SCLK"), false);
set_iologic_eclk(iol, ci, id_ECLK);
set_iologic_lsr(iol, ci, ctx->id("RST"), false);
set_iologic_lsr(iol, ci, ctx->id("RST"), true);
replace_port(ci, ctx->id("D0"), iol, id_TXDATA0);
replace_port(ci, ctx->id("D1"), iol, id_TXDATA2);
iol->params[ctx->id("GSR")] = str_or_default(ci->params, ctx->id("GSR"), "DISABLED");
iol->params[ctx->id("MODDRX.MODE")] = std::string("MOSHX2");
pio->params[ctx->id("DATAMUX_MDDR")] = std::string("IOLDO");
packed_cells.insert(cell.first);
} else if (ci->type == ctx->id("ODDRX2DQA") || ci->type == ctx->id("ODDRX2DQSB")) {
CellInfo *pio = net_only_drives(ctx, ci->ports.at(ctx->id("Q")).net, is_trellis_io, id_I, true);
if (pio == nullptr)
log_error("%s '%s' Q output must be connected only to a top level output\n", ci->type.c_str(ctx),
ci->name.c_str(ctx));
CellInfo *iol;
if (pio_iologic.count(pio->name))
iol = pio_iologic.at(pio->name);
else
iol = create_pio_iologic(pio, ci);
set_iologic_mode(iol, "MIDDRX_MODDRX");
replace_port(ci, ctx->id("Q"), iol, id_IOLDO);
if (!pio->ports.count(id_IOLDO)) {
pio->ports[id_IOLDO].name = id_IOLDO;
pio->ports[id_IOLDO].type = PORT_IN;
}
replace_port(pio, id_I, pio, id_IOLDO);
set_iologic_sclk(iol, ci, ctx->id("SCLK"), false);
set_iologic_eclk(iol, ci, id_ECLK);
set_iologic_lsr(iol, ci, ctx->id("RST"), false);
set_iologic_lsr(iol, ci, ctx->id("RST"), true);
replace_port(ci, ctx->id("D0"), iol, id_TXDATA0);
replace_port(ci, ctx->id("D1"), iol, id_TXDATA1);
replace_port(ci, ctx->id("D2"), iol, id_TXDATA2);
replace_port(ci, ctx->id("D3"), iol, id_TXDATA3);
iol->params[ctx->id("GSR")] = str_or_default(ci->params, ctx->id("GSR"), "DISABLED");
iol->params[ctx->id("MODDRX.MODE")] = std::string("MODDRX2");
iol->params[ctx->id("MIDDRX_MODDRX.WRCLKMUX")] =
std::string(ci->type == ctx->id("ODDRX2DQSB") ? "DQSW" : "DQSW270");
process_dqs_port(ci, pio, iol, ci->type == ctx->id("ODDRX2DQSB") ? id_DQSW : id_DQSW270);
pio->params[ctx->id("DATAMUX_MDDR")] = std::string("IOLDO");
packed_cells.insert(cell.first);
} else if (ci->type == ctx->id("IDDRX2DQA")) {
CellInfo *pio = net_driven_by(ctx, ci->ports.at(ctx->id("D")).net, is_trellis_io, id_O);
if (pio == nullptr || ci->ports.at(ctx->id("D")).net->users.size() > 1)
log_error("IDDRX2DQA '%s' D input must be connected only to a top level input\n",
ci->name.c_str(ctx));
CellInfo *iol;
if (pio_iologic.count(pio->name))
iol = pio_iologic.at(pio->name);
else
iol = create_pio_iologic(pio, ci);
set_iologic_mode(iol, "MIDDRX_MODDRX");
replace_port(ci, ctx->id("D"), iol, id_PADDI);
set_iologic_sclk(iol, ci, ctx->id("SCLK"), true);
set_iologic_eclk(iol, ci, id_ECLK);
set_iologic_lsr(iol, ci, ctx->id("RST"), true);
replace_port(ci, ctx->id("Q0"), iol, id_RXDATA0);
replace_port(ci, ctx->id("Q1"), iol, id_RXDATA1);
replace_port(ci, ctx->id("Q2"), iol, id_RXDATA2);
replace_port(ci, ctx->id("Q3"), iol, id_RXDATA3);
replace_port(ci, ctx->id("QWL"), iol, id_INFF);
iol->params[ctx->id("GSR")] = str_or_default(ci->params, ctx->id("GSR"), "DISABLED");
iol->params[ctx->id("MIDDRX.MODE")] = std::string("MIDDRX2");
process_dqs_port(ci, pio, iol, id_DQSR90);
process_dqs_port(ci, pio, iol, id_RDPNTR2);
process_dqs_port(ci, pio, iol, id_RDPNTR1);
process_dqs_port(ci, pio, iol, id_RDPNTR0);
process_dqs_port(ci, pio, iol, id_WRPNTR2);
process_dqs_port(ci, pio, iol, id_WRPNTR1);
process_dqs_port(ci, pio, iol, id_WRPNTR0);
packed_cells.insert(cell.first);
} else if (ci->type == ctx->id("TSHX2DQA") || ci->type == ctx->id("TSHX2DQSA")) {
CellInfo *pio = net_only_drives(ctx, ci->ports.at(ctx->id("Q")).net, is_trellis_io, id_T, true);
if (pio == nullptr)
log_error("%s '%s' Q output must be connected only to a top level tristate\n", ci->type.c_str(ctx),
ci->name.c_str(ctx));
CellInfo *iol;
if (pio_iologic.count(pio->name))
iol = pio_iologic.at(pio->name);
else
iol = create_pio_iologic(pio, ci);
set_iologic_mode(iol, "MIDDRX_MODDRX");
replace_port(ci, ctx->id("Q"), iol, id_IOLTO);
if (!pio->ports.count(id_IOLTO)) {
pio->ports[id_IOLTO].name = id_IOLTO;
pio->ports[id_IOLTO].type = PORT_IN;
}
replace_port(pio, id_T, pio, id_IOLTO);
set_iologic_sclk(iol, ci, ctx->id("SCLK"), false);
set_iologic_eclk(iol, ci, id_ECLK);
set_iologic_lsr(iol, ci, ctx->id("RST"), false);
replace_port(ci, ctx->id("T0"), iol, id_TSDATA0);
replace_port(ci, ctx->id("T1"), iol, id_TSDATA1);
process_dqs_port(ci, pio, iol, ci->type == ctx->id("TSHX2DQSA") ? id_DQSW : id_DQSW270);
iol->params[ctx->id("GSR")] = str_or_default(ci->params, ctx->id("GSR"), "DISABLED");
iol->params[ctx->id("MTDDRX.MODE")] = std::string("MTSHX2");
iol->params[ctx->id("MTDDRX.REGSET")] = std::string("SET");
iol->params[ctx->id("MTDDRX.DQSW_INVERT")] =
std::string(ci->type == ctx->id("TSHX2DQSA") ? "ENABLED" : "DISABLED");
iol->params[ctx->id("MIDDRX_MODDRX.WRCLKMUX")] =
std::string(ci->type == ctx->id("TSHX2DQSA") ? "DQSW" : "DQSW270");
iol->params[ctx->id("IOLTOMUX")] = std::string("TDDR");
packed_cells.insert(cell.first);
} else if (ci->type == ctx->id("TRELLIS_FF") && bool_or_default(ci->attrs, ctx->id("syn_useioff"))) {
// Pack IO flipflop into IOLOGIC
std::string mode = str_or_default(ci->attrs, ctx->id("ioff_dir"), "");
if (mode != "output") {
// See if it can be packed as an input ff
NetInfo *d = get_net_or_empty(ci, ctx->id("DI"));
CellInfo *pio = net_driven_by(ctx, d, is_trellis_io, id_O);
if (pio != nullptr && d->users.size() == 1) {
// Input FF
CellInfo *iol;
if (pio_iologic.count(pio->name))
iol = pio_iologic.at(pio->name);
else
iol = create_pio_iologic(pio, ci);
set_iologic_mode(iol, "IREG_OREG");
set_iologic_sclk(iol, ci, ctx->id("CLK"), true);
set_iologic_lsr(iol, ci, ctx->id("LSR"), true);
// Handle CLK and CE muxes
if (str_or_default(ci->params, ctx->id("CLKMUX")) == "INV")
iol->params[ctx->id("CLKIMUX")] = std::string("INV");
if (str_or_default(ci->params, ctx->id("CEMUX"), "CE") == "CE") {
iol->params[ctx->id("CEIMUX")] = std::string("CEMUX");
iol->params[ctx->id("CEMUX")] = std::string("CE");
if (get_net_or_empty(ci, ctx->id("CE")) == nullptr)
replace_port(ci, ctx->id("CE"), iol, ctx->id("CE"));
else
disconnect_port(ctx, ci, ctx->id("CE"));
} else {
iol->params[ctx->id("CEIMUX")] = std::string("1");
}
// Set IOLOGIC params from FF params
iol->params[ctx->id("FF.INREGMODE")] = std::string("FF");
iol->params[ctx->id("FF.REGSET")] = str_or_default(ci->params, ctx->id("REGSET"), "RESET");
iol->params[ctx->id("SRMODE")] = str_or_default(ci->params, ctx->id("SRMODE"), "ASYNC");
iol->params[ctx->id("GSR")] = str_or_default(ci->params, ctx->id("GSR"), "DISABLED");
replace_port(ci, ctx->id("DI"), iol, id_PADDI);
replace_port(ci, ctx->id("Q"), iol, id_INFF);
packed_cells.insert(cell.first);
continue;
}
}
if (mode != "input") {
CellInfo *pio_t = net_only_drives(ctx, ci->ports.at(ctx->id("Q")).net, is_trellis_io, id_T, true);
CellInfo *pio_i = net_only_drives(ctx, ci->ports.at(ctx->id("Q")).net, is_trellis_io, id_I, true);
if (pio_t != nullptr || pio_i != nullptr) {
// Output or tristate FF
bool tri = (pio_t != nullptr);
CellInfo *pio = tri ? pio_t : pio_i;
CellInfo *iol;
if (pio_iologic.count(pio->name))
iol = pio_iologic.at(pio->name);
else
iol = create_pio_iologic(pio, ci);
set_iologic_mode(iol, "IREG_OREG");
// Connection between FF and PIO
replace_port(ci, ctx->id("Q"), iol, tri ? id_IOLTO : id_IOLDO);
if (tri) {
if (!pio->ports.count(id_IOLTO)) {
pio->ports[id_IOLTO].name = id_IOLTO;
pio->ports[id_IOLTO].type = PORT_IN;
}
pio->params[ctx->id("TRIMUX_TSREG")] = std::string("IOLTO");
replace_port(pio, id_T, pio, id_IOLTO);
} else {
if (!pio->ports.count(id_IOLDO)) {
pio->ports[id_IOLDO].name = id_IOLDO;
pio->ports[id_IOLDO].type = PORT_IN;
}
pio->params[ctx->id("DATAMUX_OREG")] = std::string("IOLDO");
replace_port(pio, id_I, pio, id_IOLDO);
}
set_iologic_sclk(iol, ci, ctx->id("CLK"), false);
set_iologic_lsr(iol, ci, ctx->id("LSR"), false);
// Handle CLK and CE muxes
if (str_or_default(ci->params, ctx->id("CLKMUX")) == "INV")
iol->params[ctx->id("CLKOMUX")] = std::string("INV");
if (str_or_default(ci->params, ctx->id("CEMUX"), "CE") == "CE") {
iol->params[ctx->id("CEOMUX")] = std::string("CEMUX");
iol->params[ctx->id("CEMUX")] = std::string("CE");
if (get_net_or_empty(ci, ctx->id("CE")) == nullptr)
replace_port(ci, ctx->id("CE"), iol, ctx->id("CE"));
else
disconnect_port(ctx, ci, ctx->id("CE"));
} else {
iol->params[ctx->id("CEOMUX")] = std::string("1");
}
// FF params
iol->params[ctx->id(tri ? "TSREG.OUTREGMODE" : "OUTREG.OUTREGMODE")] = std::string("FF");
iol->params[ctx->id(tri ? "TSREG.REGSET" : "OUTREG.REGSET")] =
str_or_default(ci->params, ctx->id("REGSET"), "RESET");
iol->params[ctx->id("SRMODE")] = str_or_default(ci->params, ctx->id("SRMODE"), "ASYNC");
// Data input
replace_port(ci, ctx->id("DI"), iol, tri ? id_TSDATA0 : id_TXDATA0);
iol->params[ctx->id("GSR")] = str_or_default(ci->params, ctx->id("GSR"), "DISABLED");
packed_cells.insert(cell.first);
continue;
}
}
log_error("Failed to pack flipflop '%s' with 'syn_useioff' set into IOLOGIC.\n", ci->name.c_str(ctx));
}
}
flush_cells();
// Constrain ECLK-related cells
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_ECLKBRIDGECS) {
Loc loc;
NetInfo *i0 = get_net_or_empty(ci, id_CLK0), *i1 = get_net_or_empty(ci, id_CLK1),
*o = get_net_or_empty(ci, id_ECSOUT);
for (NetInfo *input : {i0, i1}) {
if (input == nullptr)
continue;
for (auto user : input->users) {
if (!user.cell->attrs.count(ctx->id("BEL")))
continue;
Loc user_loc = ctx->getBelLocation(
ctx->getBelByName(ctx->id(user.cell->attrs.at(ctx->id("BEL")).as_string())));
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_ECLKBRIDGECS)
continue;
loc = ctx->getBelLocation(bel);
if (loc.x == user_loc.x) {
ci->attrs[ctx->id("BEL")] = ctx->getBelName(bel).str(ctx);
goto eclkbridge_done;
}
}
}
if (input->driver.cell != nullptr) {
CellInfo *drv = input->driver.cell;
if (!drv->attrs.count(ctx->id("BEL")))
continue;
Loc drv_loc = ctx->getBelLocation(
ctx->getBelByName(ctx->id(drv->attrs.at(ctx->id("BEL")).as_string())));
BelId closest;
int closest_x = -1; // aim for same side of chip
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_ECLKBRIDGECS)
continue;
loc = ctx->getBelLocation(bel);
if (closest_x == -1 || std::abs(loc.x - drv_loc.x) < std::abs(closest_x - drv_loc.x)) {
closest_x = loc.x;
closest = bel;
}
}
NPNR_ASSERT(closest != BelId());
loc = ctx->getBelLocation(closest);
ci->attrs[ctx->id("BEL")] = ctx->getBelName(closest).str(ctx);
goto eclkbridge_done;
}
}
// If all else fails, place randomly
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_ECLKBRIDGECS)
continue;
loc = ctx->getBelLocation(bel);
ci->attrs[ctx->id("BEL")] = ctx->getBelName(bel).str(ctx);
}
eclkbridge_done:
if (o != nullptr)
for (auto user2 : o->users) {
// Set side hint to ensure edge clock choice is routeable
if (user2.cell->type == id_ECLKSYNCB && user2.port == id_ECLKI) {
NetInfo *synco = get_net_or_empty(user2.cell, id_ECLKO);
if (synco != nullptr)
bridge_side_hint[synco] = (loc.x > 1) ? 0 : 1;
}
}
continue;
}
}
// Promote/route edge clocks
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_IOLOGIC || ci->type == id_DQSBUFM) {
if (!ci->ports.count(id_ECLK) || ci->ports.at(id_ECLK).net == nullptr)
continue;
BelId bel = ctx->getBelByName(ctx->id(str_or_default(ci->attrs, ctx->id("BEL"))));
NPNR_ASSERT(bel != BelId());
Loc pioLoc = ctx->getBelLocation(bel);
if (ci->type == id_DQSBUFM)
pioLoc.z -= 8;
else
pioLoc.z -= 4;
BelId pioBel = ctx->getBelByLocation(pioLoc);
NPNR_ASSERT(pioBel != BelId());
int bank = ctx->getPioBelBank(pioBel);
make_eclk(ci->ports.at(id_ECLK), ci, bel, bank);
}
}
flush_cells();
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_CLKDIVF) {
const NetInfo *clki = net_or_nullptr(ci, id_CLKI);
for (auto &eclk : eclks) {
if (eclk.second.unbuf == clki) {
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_CLKDIVF)
continue;
Loc loc = ctx->getBelLocation(bel);
// CLKDIVF for bank 6/7 on the left; for bank 2/3 on the right
if (loc.x < 10 && eclk.first.first != 6 && eclk.first.first != 7)
continue;
// z-index of CLKDIVF must match index of ECLK
if (loc.z != eclk.first.second)
continue;
ci->attrs[ctx->id("BEL")] = ctx->getBelName(bel).str(ctx);
make_eclk(ci->ports.at(id_CLKI), ci, bel, eclk.first.first);
goto clkdiv_done;
}
}
}
clkdiv_done:
continue;
} else if (ci->type == id_ECLKSYNCB) {
const NetInfo *eclki = net_or_nullptr(ci, id_ECLKI);
const NetInfo *eclko = net_or_nullptr(ci, id_ECLKO);
if (eclki != nullptr && eclki->driver.cell != nullptr) {
if (eclki->driver.cell->type == id_ECLKBRIDGECS) {
BelId bel =
ctx->getBelByName(ctx->id(eclki->driver.cell->attrs.at(ctx->id("BEL")).as_string()));
Loc loc = ctx->getBelLocation(bel);
ci->attrs[ctx->id("BEL")] =
ctx->getBelName(ctx->getBelByLocation(Loc(loc.x, loc.y, 15))).str(ctx);
goto eclksync_done;
}
}
if (eclko == nullptr)
log_error("ECLKSYNCB '%s' has disconnected port ECLKO\n", ci->name.c_str(ctx));
for (auto user : eclko->users) {
if (user.cell->type == id_TRELLIS_ECLKBUF) {
Loc eckbuf_loc = ctx->getBelLocation(
ctx->getBelByName(ctx->id(user.cell->attrs.at(ctx->id("BEL")).as_string())));
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_ECLKSYNCB)
continue;
Loc loc = ctx->getBelLocation(bel);
if (loc.x == eckbuf_loc.x && loc.y == eckbuf_loc.y && loc.z == eckbuf_loc.z - 2) {
ci->attrs[ctx->id("BEL")] = ctx->getBelName(bel).str(ctx);
goto eclksync_done;
}
}
}
}
eclksync_done:
continue;
} else if (ci->type == ctx->id("DDRDLLA")) {
ci->type = id_DDRDLL; // transform from Verilog to Bel name
const NetInfo *clk = net_or_nullptr(ci, id_CLK);
if (clk == nullptr)
log_error("DDRDLLA '%s' has disconnected port CLK\n", ci->name.c_str(ctx));
for (auto &eclk : eclks) {
if (eclk.second.unbuf == clk) {
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_DDRDLL)
continue;
Loc loc = ctx->getBelLocation(bel);
int ddrdll_bank = -1;
if (loc.x < 15 && loc.y < 15)
ddrdll_bank = 7;
else if (loc.x < 15 && loc.y > 15)
ddrdll_bank = 6;
else if (loc.x > 15 && loc.y < 15)
ddrdll_bank = 2;
else if (loc.x > 15 && loc.y > 15)
ddrdll_bank = 3;
if (eclk.first.first != ddrdll_bank)
continue;
ci->attrs[ctx->id("BEL")] = ctx->getBelName(bel).str(ctx);
make_eclk(ci->ports.at(id_CLK), ci, bel, eclk.first.first);
goto ddrdll_done;
}
}
}
ddrdll_done:
continue;
}
}
flush_cells();
};
void generate_constraints()
{
log_info("Generating derived timing constraints...\n");
auto MHz = [&](delay_t a) { return 1000.0 / ctx->getDelayNS(a); };
auto equals_epsilon = [](delay_t a, delay_t b) { return (std::abs(a - b) / std::max(double(b), 1.0)) < 1e-3; };
std::unordered_set<IdString> user_constrained, changed_nets;
for (auto &net : ctx->nets) {
if (net.second->clkconstr != nullptr)
user_constrained.insert(net.first);
changed_nets.insert(net.first);
}
auto get_period = [&](CellInfo *ci, IdString port, delay_t &period) {
if (!ci->ports.count(port))
return false;
NetInfo *from = ci->ports.at(port).net;
if (from == nullptr || from->clkconstr == nullptr)
return false;
period = from->clkconstr->period.min_delay;
return true;
};
auto set_period = [&](CellInfo *ci, IdString port, delay_t period) {
if (!ci->ports.count(port))
return;
NetInfo *to = ci->ports.at(port).net;
if (to == nullptr)
return;
if (to->clkconstr != nullptr) {
if (!equals_epsilon(to->clkconstr->period.min_delay, period) && user_constrained.count(to->name))
log_warning(
" Overriding derived constraint of %.1f MHz on net %s with user-specified constraint of "
"%.1f MHz.\n",
MHz(to->clkconstr->period.min_delay), to->name.c_str(ctx), MHz(period));
return;
}
to->clkconstr = std::unique_ptr<ClockConstraint>(new ClockConstraint());
to->clkconstr->low.min_delay = period / 2;
to->clkconstr->low.max_delay = period / 2;
to->clkconstr->high.min_delay = period / 2;
to->clkconstr->high.max_delay = period / 2;
to->clkconstr->period.min_delay = period;
to->clkconstr->period.max_delay = period;
log_info(" Derived frequency constraint of %.1f MHz for net %s\n", MHz(to->clkconstr->period.min_delay),
to->name.c_str(ctx));
changed_nets.insert(to->name);
};
auto copy_constraint = [&](CellInfo *ci, IdString fromPort, IdString toPort, double ratio = 1.0) {
if (!ci->ports.count(fromPort) || !ci->ports.count(toPort))
return;
NetInfo *from = ci->ports.at(fromPort).net, *to = ci->ports.at(toPort).net;
if (from == nullptr || from->clkconstr == nullptr || to == nullptr)
return;
if (to->clkconstr != nullptr) {
if (!equals_epsilon(to->clkconstr->period.min_delay,
delay_t(from->clkconstr->period.min_delay / ratio)) &&
user_constrained.count(to->name))
log_warning(
" Overriding derived constraint of %.1f MHz on net %s with user-specified constraint of "
"%.1f MHz.\n",
MHz(to->clkconstr->period.min_delay), to->name.c_str(ctx),
MHz(delay_t(from->clkconstr->period.min_delay / ratio)));
return;
}
to->clkconstr = std::unique_ptr<ClockConstraint>(new ClockConstraint());
to->clkconstr->low = ctx->getDelayFromNS(ctx->getDelayNS(from->clkconstr->low.min_delay) / ratio);
to->clkconstr->high = ctx->getDelayFromNS(ctx->getDelayNS(from->clkconstr->high.min_delay) / ratio);
to->clkconstr->period = ctx->getDelayFromNS(ctx->getDelayNS(from->clkconstr->period.min_delay) / ratio);
log_info(" Derived frequency constraint of %.1f MHz for net %s\n", MHz(to->clkconstr->period.min_delay),
to->name.c_str(ctx));
changed_nets.insert(to->name);
};
// Run in a loop while constraints are changing to deal with dependencies
// Iteration limit avoids hanging in crazy loopback situation (self-fed PLLs or dividers, etc)
int iter = 0;
const int itermax = 5000;
while (!changed_nets.empty() && iter < itermax) {
++iter;
std::unordered_set<IdString> changed_cells;
for (auto net : changed_nets)
for (auto &user : ctx->nets.at(net)->users)
if (user.port == id_CLKI || user.port == id_ECLKI || user.port == id_CLK0 || user.port == id_CLK1)
changed_cells.insert(user.cell->name);
changed_nets.clear();
for (auto cell : sorted(changed_cells)) {
CellInfo *ci = ctx->cells.at(cell).get();
if (ci->type == id_CLKDIVF) {
std::string div = str_or_default(ci->params, ctx->id("DIV"), "2.0");
double ratio;
if (div == "2.0")
ratio = 1 / 2.0;
else if (div == "3.5")
ratio = 1 / 3.5;
else
log_error("Unsupported divider ratio '%s' on CLKDIVF '%s'\n", div.c_str(), ci->name.c_str(ctx));
copy_constraint(ci, id_CLKI, id_CDIVX, ratio);
} else if (ci->type == id_ECLKSYNCB || ci->type == id_TRELLIS_ECLKBUF) {
copy_constraint(ci, id_ECLKI, id_ECLKO, 1);
} else if (ci->type == id_ECLKBRIDGECS) {
copy_constraint(ci, id_CLK0, id_ECSOUT, 1);
copy_constraint(ci, id_CLK1, id_ECSOUT, 1);
} else if (ci->type == id_DCCA) {
copy_constraint(ci, id_CLKI, id_CLKO, 1);
} else if (ci->type == id_EHXPLLL) {
delay_t period_in;
if (!get_period(ci, id_CLKI, period_in))
continue;
log_info(" Input frequency of PLL '%s' is constrained to %.1f MHz\n", ci->name.c_str(ctx),
MHz(period_in));
double period_in_div = period_in * int_or_default(ci->params, ctx->id("CLKI_DIV"), 1);
std::string path = str_or_default(ci->params, ctx->id("FEEDBK_PATH"), "CLKOP");
int feedback_div = int_or_default(ci->params, ctx->id("CLKFB_DIV"), 1);
if (path == "CLKOP" || path == "INT_OP")
feedback_div *= int_or_default(ci->params, ctx->id("CLKOP_DIV"), 1);
else if (path == "CLKOS" || path == "INT_OS")
feedback_div *= int_or_default(ci->params, ctx->id("CLKOS_DIV"), 1);
else if (path == "CLKOS2" || path == "INT_OS2")
feedback_div *= int_or_default(ci->params, ctx->id("CLKOS2_DIV"), 1);
else if (path == "CLKOS3" || path == "INT_OS3")
feedback_div *= int_or_default(ci->params, ctx->id("CLKOS3_DIV"), 1);
else {
log_info(" Unable to determine output frequencies for PLL '%s' with FEEDBK_PATH=%s\n",
ci->name.c_str(ctx), path.c_str());
continue;
}
double vco_period = period_in_div / feedback_div;
double vco_freq = MHz(vco_period);
if (vco_freq < 400 || vco_freq > 800)
log_info(" Derived VCO frequency %.1f MHz of PLL '%s' is out of legal range [400MHz, "
"800MHz]\n",
vco_freq, ci->name.c_str(ctx));
set_period(ci, id_CLKOP, vco_period * int_or_default(ci->params, ctx->id("CLKOP_DIV"), 1));
set_period(ci, id_CLKOS, vco_period * int_or_default(ci->params, ctx->id("CLKOS_DIV"), 1));
set_period(ci, id_CLKOS2, vco_period * int_or_default(ci->params, ctx->id("CLKOS2_DIV"), 1));
set_period(ci, id_CLKOS3, vco_period * int_or_default(ci->params, ctx->id("CLKOS3_DIV"), 1));
} else if (ci->type == id_OSCG) {
int div = int_or_default(ci->params, ctx->id("DIV"), 128);
set_period(ci, id_OSC, delay_t((1.0e6 / (2.0 * 155)) * div));
}
}
}
}
void prepack_checks()
{
// Check for legacy-style JSON (use CEMUX as a clue) and error out, avoiding a confusing assertion failure
// later
for (auto cell : sorted(ctx->cells)) {
if (is_ff(ctx, cell.second) && cell.second->params.count(ctx->id("CEMUX")) &&
!cell.second->params[ctx->id("CEMUX")].is_string)
log_error("Found netlist using legacy-style JSON parameter values, please update your Yosys.\n");
}
}
public:
void pack()
{
prepack_checks();
print_logic_usage();
pack_io();
pack_dqsbuf();
preplace_plls();
pack_iologic();
pack_ebr();
pack_dsps();
pack_dcus();
pack_misc();
pack_constants();
pack_dram();
pack_carries();
find_lutff_pairs();
pack_lut5xs();
pair_luts();
pack_lut_pairs();
pack_remaining_luts();
pack_remaining_ffs();
generate_constraints();
promote_ecp5_globals(ctx);
ctx->check();
}
private:
Context *ctx;
std::unordered_set<IdString> packed_cells;
std::vector<std::unique_ptr<CellInfo>> new_cells;
struct SliceUsage
{
bool lut0_used = false, lut1_used = false;
bool ccu2_used = false, dpram_used = false, ramw_used = false;
bool ff0_used = false, ff1_used = false;
bool mux5_used = false, muxx_used = false;
};
std::unordered_map<IdString, SliceUsage> sliceUsage;
std::unordered_map<IdString, IdString> lutffPairs;
std::unordered_map<IdString, IdString> fflutPairs;
std::unordered_map<IdString, IdString> lutPairs;
};
// Main pack function
bool Arch::pack()
{
Context *ctx = getCtx();
try {
log_break();
Ecp5Packer(ctx).pack();
log_info("Checksum: 0x%08x\n", ctx->checksum());
assignArchInfo();
ctx->settings[ctx->id("pack")] = 1;
archInfoToAttributes();
return true;
} catch (log_execution_error_exception) {
assignArchInfo();
return false;
}
}
void Arch::assignArchInfo()
{
for (auto cell : sorted(cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_TRELLIS_SLICE) {
ci->sliceInfo.using_dff = false;
if (ci->ports.count(id_Q0) && ci->ports[id_Q0].net != nullptr)
ci->sliceInfo.using_dff = true;
if (ci->ports.count(id_Q1) && ci->ports[id_Q1].net != nullptr)
ci->sliceInfo.using_dff = true;
if (ci->ports.count(id_CLK) && ci->ports[id_CLK].net != nullptr)
ci->sliceInfo.clk_sig = ci->ports[id_CLK].net->name;
else
ci->sliceInfo.clk_sig = IdString();
if (ci->ports.count(id_LSR) && ci->ports[id_LSR].net != nullptr)
ci->sliceInfo.lsr_sig = ci->ports[id_LSR].net->name;
else
ci->sliceInfo.lsr_sig = IdString();
ci->sliceInfo.clkmux = id(str_or_default(ci->params, id_CLKMUX, "CLK"));
ci->sliceInfo.lsrmux = id(str_or_default(ci->params, id_LSRMUX, "LSR"));
ci->sliceInfo.srmode = id(str_or_default(ci->params, id_SRMODE, "LSR_OVER_CE"));
ci->sliceInfo.is_carry = str_or_default(ci->params, id("MODE"), "LOGIC") == "CCU2";
ci->sliceInfo.sd0 = std::stoi(str_or_default(ci->params, id("REG0_SD"), "0"));
ci->sliceInfo.sd1 = std::stoi(str_or_default(ci->params, id("REG1_SD"), "0"));
ci->sliceInfo.has_l6mux = false;
if (ci->ports.count(id_FXA) && ci->ports[id_FXA].net != nullptr &&
ci->ports[id_FXA].net->driver.port == id_OFX0)
ci->sliceInfo.has_l6mux = true;
} else if (ci->type == id_DP16KD) {
ci->ramInfo.is_pdp = (int_or_default(ci->params, id("DATA_WIDTH_A"), 0) == 36);
}
}
for (auto net : sorted(nets)) {
net.second->is_global = bool_or_default(net.second->attrs, id("ECP5_IS_GLOBAL"));
}
}
NEXTPNR_NAMESPACE_END