ice40: Move clock constraints across SB_IO and SB_GB_IO
Signed-off-by: David Shah <dave@ds0.me>
diff --git a/ice40/pack.cc b/ice40/pack.cc
index f411aee..f5649e6 100644
--- a/ice40/pack.cc
+++ b/ice40/pack.cc
@@ -490,6 +490,26 @@
sb->type.c_str(ctx), sb->name.c_str(ctx));
if (net != nullptr) {
+
+ if (net->clkconstr != nullptr) {
+ if (sb->ports.count(id_D_IN_0)) {
+ NetInfo *din0_net = sb->ports.at(id_D_IN_0).net;
+ if (din0_net != nullptr && !din0_net->clkconstr) {
+ // Copy clock constraint from IO pad to input buffer output
+ din0_net->clkconstr =
+ std::unique_ptr<ClockConstraint>(new ClockConstraint(*net->clkconstr));
+ }
+ }
+ if (is_sb_gb_io(ctx, sb) && sb->ports.count(id_GLOBAL_BUFFER_OUTPUT)) {
+ NetInfo *gb_net = sb->ports.at(id_GLOBAL_BUFFER_OUTPUT).net;
+ if (gb_net != nullptr && !gb_net->clkconstr) {
+ // Copy clock constraint from IO pad to global buffer output
+ gb_net->clkconstr =
+ std::unique_ptr<ClockConstraint>(new ClockConstraint(*net->clkconstr));
+ }
+ }
+ }
+
delete_nets.insert(net->name);
sb->ports.at(ctx->id("PACKAGE_PIN")).net = nullptr;
}
