Google Git
Sign in
foss-fpga-tools / third_party / yosys / 6cdea425b81fcfe1eec20cbfc4c4e27d46cb641d / . / techlibs / xilinx / cells_sim.v
blob: fa33f4596f713e5c731d4d525c0acb6e7fa48dad [file] [log] [blame]
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* 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.
*
*/
// See Xilinx UG953 and UG474 for a description of the cell types below.
// http://www.xilinx.com/support/documentation/user_guides/ug474_7Series_CLB.pdf
// http://www.xilinx.com/support/documentation/sw_manuals/xilinx2014_4/ug953-vivado-7series-libraries.pdf
module VCC(output P);
assign P = 1;
endmodule
module GND(output G);
assign G = 0;
endmodule
module IBUF(
output O,
(* iopad_external_pin *)
input I);
parameter IOSTANDARD = "default";
parameter IBUF_LOW_PWR = 0;
assign O = I;
endmodule
module IBUFG(
output O,
(* iopad_external_pin *)
input I);
parameter CAPACITANCE = "DONT_CARE";
parameter IBUF_DELAY_VALUE = "0";
parameter IBUF_LOW_PWR = "TRUE";
parameter IOSTANDARD = "DEFAULT";
assign O = I;
endmodule
module OBUF(
(* iopad_external_pin *)
output O,
input I);
parameter IOSTANDARD = "default";
parameter DRIVE = 12;
parameter SLEW = "SLOW";
assign O = I;
endmodule
module BUFG(
(* clkbuf_driver *)
output O,
input I);
assign O = I;
endmodule
module BUFGCTRL(
(* clkbuf_driver *)
output O,
input I0, input I1,
(* invertible_pin = "IS_S0_INVERTED" *)
input S0,
(* invertible_pin = "IS_S1_INVERTED" *)
input S1,
(* invertible_pin = "IS_CE0_INVERTED" *)
input CE0,
(* invertible_pin = "IS_CE1_INVERTED" *)
input CE1,
(* invertible_pin = "IS_IGNORE0_INVERTED" *)
input IGNORE0,
(* invertible_pin = "IS_IGNORE1_INVERTED" *)
input IGNORE1);
parameter [0:0] INIT_OUT = 1'b0;
parameter PRESELECT_I0 = "FALSE";
parameter PRESELECT_I1 = "FALSE";
parameter [0:0] IS_CE0_INVERTED = 1'b0;
parameter [0:0] IS_CE1_INVERTED = 1'b0;
parameter [0:0] IS_S0_INVERTED = 1'b0;
parameter [0:0] IS_S1_INVERTED = 1'b0;
parameter [0:0] IS_IGNORE0_INVERTED = 1'b0;
parameter [0:0] IS_IGNORE1_INVERTED = 1'b0;
wire I0_internal = ((CE0 ^ IS_CE0_INVERTED) ? I0 : INIT_OUT);
wire I1_internal = ((CE1 ^ IS_CE1_INVERTED) ? I1 : INIT_OUT);
wire S0_true = (S0 ^ IS_S0_INVERTED);
wire S1_true = (S1 ^ IS_S1_INVERTED);
assign O = S0_true ? I0_internal : (S1_true ? I1_internal : INIT_OUT);
endmodule
module BUFHCE(
(* clkbuf_driver *)
output O,
input I,
(* invertible_pin = "IS_CE_INVERTED" *)
input CE);
parameter [0:0] INIT_OUT = 1'b0;
parameter CE_TYPE = "SYNC";
parameter [0:0] IS_CE_INVERTED = 1'b0;
assign O = ((CE ^ IS_CE_INVERTED) ? I : INIT_OUT);
endmodule
// module OBUFT(output O, input I, T);
// assign O = T ? 1'bz : I;
// endmodule
// module IOBUF(inout IO, output O, input I, T);
// assign O = IO, IO = T ? 1'bz : I;
// endmodule
module INV(
(* clkbuf_inv = "I" *)
output O,
input I
);
assign O = !I;
endmodule
module LUT1(output O, input I0);
parameter [1:0] INIT = 0;
assign O = I0 ? INIT[1] : INIT[0];
endmodule
module LUT2(output O, input I0, I1);
parameter [3:0] INIT = 0;
wire [ 1: 0] s1 = I1 ? INIT[ 3: 2] : INIT[ 1: 0];
assign O = I0 ? s1[1] : s1[0];
endmodule
module LUT3(output O, input I0, I1, I2);
parameter [7:0] INIT = 0;
wire [ 3: 0] s2 = I2 ? INIT[ 7: 4] : INIT[ 3: 0];
wire [ 1: 0] s1 = I1 ? s2[ 3: 2] : s2[ 1: 0];
assign O = I0 ? s1[1] : s1[0];
endmodule
module LUT4(output O, input I0, I1, I2, I3);
parameter [15:0] INIT = 0;
wire [ 7: 0] s3 = I3 ? INIT[15: 8] : INIT[ 7: 0];
wire [ 3: 0] s2 = I2 ? s3[ 7: 4] : s3[ 3: 0];
wire [ 1: 0] s1 = I1 ? s2[ 3: 2] : s2[ 1: 0];
assign O = I0 ? s1[1] : s1[0];
endmodule
module LUT5(output O, input I0, I1, I2, I3, I4);
parameter [31:0] INIT = 0;
wire [15: 0] s4 = I4 ? INIT[31:16] : INIT[15: 0];
wire [ 7: 0] s3 = I3 ? s4[15: 8] : s4[ 7: 0];
wire [ 3: 0] s2 = I2 ? s3[ 7: 4] : s3[ 3: 0];
wire [ 1: 0] s1 = I1 ? s2[ 3: 2] : s2[ 1: 0];
assign O = I0 ? s1[1] : s1[0];
endmodule
module LUT6(output O, input I0, I1, I2, I3, I4, I5);
parameter [63:0] INIT = 0;
wire [31: 0] s5 = I5 ? INIT[63:32] : INIT[31: 0];
wire [15: 0] s4 = I4 ? s5[31:16] : s5[15: 0];
wire [ 7: 0] s3 = I3 ? s4[15: 8] : s4[ 7: 0];
wire [ 3: 0] s2 = I2 ? s3[ 7: 4] : s3[ 3: 0];
wire [ 1: 0] s1 = I1 ? s2[ 3: 2] : s2[ 1: 0];
assign O = I0 ? s1[1] : s1[0];
endmodule
module LUT6_2(output O6, output O5, input I0, I1, I2, I3, I4, I5);
parameter [63:0] INIT = 0;
wire [31: 0] s5 = I5 ? INIT[63:32] : INIT[31: 0];
wire [15: 0] s4 = I4 ? s5[31:16] : s5[15: 0];
wire [ 7: 0] s3 = I3 ? s4[15: 8] : s4[ 7: 0];
wire [ 3: 0] s2 = I2 ? s3[ 7: 4] : s3[ 3: 0];
wire [ 1: 0] s1 = I1 ? s2[ 3: 2] : s2[ 1: 0];
assign O6 = I0 ? s1[1] : s1[0];
wire [15: 0] s5_4 = I4 ? INIT[31:16] : INIT[15: 0];
wire [ 7: 0] s5_3 = I3 ? s5_4[15: 8] : s5_4[ 7: 0];
wire [ 3: 0] s5_2 = I2 ? s5_3[ 7: 4] : s5_3[ 3: 0];
wire [ 1: 0] s5_1 = I1 ? s5_2[ 3: 2] : s5_2[ 1: 0];
assign O5 = I0 ? s5_1[1] : s5_1[0];
endmodule
module MUXCY(output O, input CI, DI, S);
assign O = S ? CI : DI;
endmodule
(* abc9_box_id = 1, lib_whitebox *)
module MUXF7(output O, input I0, I1, S);
assign O = S ? I1 : I0;
endmodule
(* abc9_box_id = 2, lib_whitebox *)
module MUXF8(output O, input I0, I1, S);
assign O = S ? I1 : I0;
endmodule
module XORCY(output O, input CI, LI);
assign O = CI ^ LI;
endmodule
(* abc9_box_id = 4, lib_whitebox *)
module CARRY4(
(* abc9_carry *)
output [3:0] CO,
output [3:0] O,
(* abc9_carry *)
input CI,
input CYINIT,
input [3:0] DI, S
);
assign O = S ^ {CO[2:0], CI | CYINIT};
assign CO[0] = S[0] ? CI | CYINIT : DI[0];
assign CO[1] = S[1] ? CO[0] : DI[1];
assign CO[2] = S[2] ? CO[1] : DI[2];
assign CO[3] = S[3] ? CO[2] : DI[3];
endmodule
`ifdef _EXPLICIT_CARRY
module CARRY0(output CO_CHAIN, CO_FABRIC, O, input CI, CI_INIT, DI, S);
parameter CYINIT_FABRIC = 0;
wire CI_COMBINE;
if(CYINIT_FABRIC) begin
assign CI_COMBINE = CI_INIT;
end else begin
assign CI_COMBINE = CI;
end
assign CO_CHAIN = S ? CI_COMBINE : DI;
assign CO_FABRIC = S ? CI_COMBINE : DI;
assign O = S ^ CI_COMBINE;
endmodule
module CARRY(output CO_CHAIN, CO_FABRIC, O, input CI, DI, S);
assign CO_CHAIN = S ? CI : DI;
assign CO_FABRIC = S ? CI : DI;
assign O = S ^ CI;
endmodule
`endif
// Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf#L238-L250
module FDRE (
(* abc9_arrival=303 *)
output reg Q,
(* clkbuf_sink *)
(* invertible_pin = "IS_C_INVERTED" *)
input C,
input CE,
(* invertible_pin = "IS_D_INVERTED" *)
input D,
(* invertible_pin = "IS_R_INVERTED" *)
input R
);
parameter [0:0] INIT = 1'b0;
parameter [0:0] IS_C_INVERTED = 1'b0;
parameter [0:0] IS_D_INVERTED = 1'b0;
parameter [0:0] IS_R_INVERTED = 1'b0;
initial Q <= INIT;
generate case (|IS_C_INVERTED)
1'b0: always @(posedge C) if (R == !IS_R_INVERTED) Q <= 1'b0; else if (CE) Q <= D ^ IS_D_INVERTED;
1'b1: always @(negedge C) if (R == !IS_R_INVERTED) Q <= 1'b0; else if (CE) Q <= D ^ IS_D_INVERTED;
endcase endgenerate
endmodule
module FDSE (
(* abc9_arrival=303 *)
output reg Q,
(* clkbuf_sink *)
(* invertible_pin = "IS_C_INVERTED" *)
input C,
input CE,
(* invertible_pin = "IS_D_INVERTED" *)
input D,
(* invertible_pin = "IS_S_INVERTED" *)
input S
);
parameter [0:0] INIT = 1'b1;
parameter [0:0] IS_C_INVERTED = 1'b0;
parameter [0:0] IS_D_INVERTED = 1'b0;
parameter [0:0] IS_S_INVERTED = 1'b0;
initial Q <= INIT;
generate case (|IS_C_INVERTED)
1'b0: always @(posedge C) if (S == !IS_S_INVERTED) Q <= 1'b1; else if (CE) Q <= D ^ IS_D_INVERTED;
1'b1: always @(negedge C) if (S == !IS_S_INVERTED) Q <= 1'b1; else if (CE) Q <= D ^ IS_D_INVERTED;
endcase endgenerate
endmodule
module FDCE (
(* abc9_arrival=303 *)
output reg Q,
(* clkbuf_sink *)
(* invertible_pin = "IS_C_INVERTED" *)
input C,
input CE,
(* invertible_pin = "IS_D_INVERTED" *)
input D,
(* invertible_pin = "IS_CLR_INVERTED" *)
input CLR
);
parameter [0:0] INIT = 1'b0;
parameter [0:0] IS_C_INVERTED = 1'b0;
parameter [0:0] IS_D_INVERTED = 1'b0;
parameter [0:0] IS_CLR_INVERTED = 1'b0;
initial Q <= INIT;
generate case ({|IS_C_INVERTED, |IS_CLR_INVERTED})
2'b00: always @(posedge C, posedge CLR) if ( CLR) Q <= 1'b0; else if (CE) Q <= D ^ IS_D_INVERTED;
2'b01: always @(posedge C, negedge CLR) if (!CLR) Q <= 1'b0; else if (CE) Q <= D ^ IS_D_INVERTED;
2'b10: always @(negedge C, posedge CLR) if ( CLR) Q <= 1'b0; else if (CE) Q <= D ^ IS_D_INVERTED;
2'b11: always @(negedge C, negedge CLR) if (!CLR) Q <= 1'b0; else if (CE) Q <= D ^ IS_D_INVERTED;
endcase endgenerate
endmodule
module FDPE (
(* abc9_arrival=303 *)
output reg Q,
(* clkbuf_sink *)
(* invertible_pin = "IS_C_INVERTED" *)
input C,
input CE,
(* invertible_pin = "IS_D_INVERTED" *)
input D,
(* invertible_pin = "IS_PRE_INVERTED" *)
input PRE
);
parameter [0:0] INIT = 1'b1;
parameter [0:0] IS_C_INVERTED = 1'b0;
parameter [0:0] IS_D_INVERTED = 1'b0;
parameter [0:0] IS_PRE_INVERTED = 1'b0;
initial Q <= INIT;
generate case ({|IS_C_INVERTED, |IS_PRE_INVERTED})
2'b00: always @(posedge C, posedge PRE) if ( PRE) Q <= 1'b1; else if (CE) Q <= D ^ IS_D_INVERTED;
2'b01: always @(posedge C, negedge PRE) if (!PRE) Q <= 1'b1; else if (CE) Q <= D ^ IS_D_INVERTED;
2'b10: always @(negedge C, posedge PRE) if ( PRE) Q <= 1'b1; else if (CE) Q <= D ^ IS_D_INVERTED;
2'b11: always @(negedge C, negedge PRE) if (!PRE) Q <= 1'b1; else if (CE) Q <= D ^ IS_D_INVERTED;
endcase endgenerate
endmodule
module FDRE_1 (
(* abc9_arrival=303 *)
output reg Q,
(* clkbuf_sink *)
input C,
input CE, D, R
);
parameter [0:0] INIT = 1'b0;
initial Q <= INIT;
always @(negedge C) if (R) Q <= 1'b0; else if(CE) Q <= D;
endmodule
module FDSE_1 (
(* abc9_arrival=303 *)
output reg Q,
(* clkbuf_sink *)
input C,
input CE, D, S
);
parameter [0:0] INIT = 1'b1;
initial Q <= INIT;
always @(negedge C) if (S) Q <= 1'b1; else if(CE) Q <= D;
endmodule
module FDCE_1 (
(* abc9_arrival=303 *)
output reg Q,
(* clkbuf_sink *)
input C,
input CE, D, CLR
);
parameter [0:0] INIT = 1'b0;
initial Q <= INIT;
always @(negedge C, posedge CLR) if (CLR) Q <= 1'b0; else if (CE) Q <= D;
endmodule
module FDPE_1 (
(* abc9_arrival=303 *)
output reg Q,
(* clkbuf_sink *)
input C,
input CE, D, PRE
);
parameter [0:0] INIT = 1'b1;
initial Q <= INIT;
always @(negedge C, posedge PRE) if (PRE) Q <= 1'b1; else if (CE) Q <= D;
endmodule
module LDCE (
output reg Q,
(* invertible_pin = "IS_CLR_INVERTED" *)
input CLR,
input D,
(* invertible_pin = "IS_G_INVERTED" *)
input G,
input GE
);
parameter [0:0] INIT = 1'b0;
parameter [0:0] IS_CLR_INVERTED = 1'b0;
parameter [0:0] IS_G_INVERTED = 1'b0;
parameter MSGON = "TRUE";
parameter XON = "TRUE";
initial Q = INIT;
wire clr = CLR ^ IS_CLR_INVERTED;
wire g = G ^ IS_G_INVERTED;
always @*
if (clr) Q = 1'b0;
else if (GE && g) Q = D;
endmodule
module LDPE (
output reg Q,
input D,
(* invertible_pin = "IS_G_INVERTED" *)
input G,
input GE,
(* invertible_pin = "IS_PRE_INVERTED" *)
input PRE
);
parameter [0:0] INIT = 1'b1;
parameter [0:0] IS_G_INVERTED = 1'b0;
parameter [0:0] IS_PRE_INVERTED = 1'b0;
parameter MSGON = "TRUE";
parameter XON = "TRUE";
initial Q = INIT;
wire g = G ^ IS_G_INVERTED;
wire pre = PRE ^ IS_PRE_INVERTED;
always @*
if (pre) Q = 1'b1;
else if (GE && g) Q = D;
endmodule
module RAM32X1D (
// Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L957
(* abc9_arrival=1153 *)
output DPO, SPO,
input D,
(* clkbuf_sink *)
(* invertible_pin = "IS_WCLK_INVERTED" *)
input WCLK,
input WE,
input A0, A1, A2, A3, A4,
input DPRA0, DPRA1, DPRA2, DPRA3, DPRA4
);
parameter INIT = 32'h0;
parameter IS_WCLK_INVERTED = 1'b0;
wire [4:0] a = {A4, A3, A2, A1, A0};
wire [4:0] dpra = {DPRA4, DPRA3, DPRA2, DPRA1, DPRA0};
reg [31:0] mem = INIT;
assign SPO = mem[a];
assign DPO = mem[dpra];
wire clk = WCLK ^ IS_WCLK_INVERTED;
always @(posedge clk) if (WE) mem[a] <= D;
endmodule
module RAM64X1D (
// Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L957
(* abc9_arrival=1153 *)
output DPO, SPO,
input D,
(* clkbuf_sink *)
(* invertible_pin = "IS_WCLK_INVERTED" *)
input WCLK,
input WE,
input A0, A1, A2, A3, A4, A5,
input DPRA0, DPRA1, DPRA2, DPRA3, DPRA4, DPRA5
);
parameter INIT = 64'h0;
parameter IS_WCLK_INVERTED = 1'b0;
wire [5:0] a = {A5, A4, A3, A2, A1, A0};
wire [5:0] dpra = {DPRA5, DPRA4, DPRA3, DPRA2, DPRA1, DPRA0};
reg [63:0] mem = INIT;
assign SPO = mem[a];
assign DPO = mem[dpra];
wire clk = WCLK ^ IS_WCLK_INVERTED;
always @(posedge clk) if (WE) mem[a] <= D;
endmodule
module RAM128X1D (
// Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L957
(* abc9_arrival=1153 *)
output DPO, SPO,
input D,
(* clkbuf_sink *)
(* invertible_pin = "IS_WCLK_INVERTED" *)
input WCLK,
input WE,
input [6:0] A, DPRA
);
parameter INIT = 128'h0;
parameter IS_WCLK_INVERTED = 1'b0;
reg [127:0] mem = INIT;
assign SPO = mem[A];
assign DPO = mem[DPRA];
wire clk = WCLK ^ IS_WCLK_INVERTED;
always @(posedge clk) if (WE) mem[A] <= D;
endmodule
module SRL16E (
// Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L904-L905
(* abc9_arrival=1472 *)
output Q,
input A0, A1, A2, A3, CE,
(* clkbuf_sink *)
(* invertible_pin = "IS_CLK_INVERTED" *)
input CLK,
input D
);
parameter [15:0] INIT = 16'h0000;
parameter [0:0] IS_CLK_INVERTED = 1'b0;
reg [15:0] r = INIT;
assign Q = r[{A3,A2,A1,A0}];
generate
if (IS_CLK_INVERTED) begin
always @(negedge CLK) if (CE) r <= { r[14:0], D };
end
else
always @(posedge CLK) if (CE) r <= { r[14:0], D };
endgenerate
endmodule
module SRLC16E (
output Q,
output Q15,
input A0, A1, A2, A3, CE,
(* clkbuf_sink *)
(* invertible_pin = "IS_CLK_INVERTED" *)
input CLK,
input D
);
parameter [15:0] INIT = 16'h0000;
parameter [0:0] IS_CLK_INVERTED = 1'b0;
reg [15:0] r = INIT;
assign Q15 = r[15];
assign Q = r[{A3,A2,A1,A0}];
generate
if (IS_CLK_INVERTED) begin
always @(negedge CLK) if (CE) r <= { r[14:0], D };
end
else
always @(posedge CLK) if (CE) r <= { r[14:0], D };
endgenerate
endmodule
module SRLC32E (
// Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L904-L905
(* abc9_arrival=1472 *)
output Q,
(* abc9_arrival=1114 *)
output Q31,
input [4:0] A,
input CE,
(* clkbuf_sink *)
(* invertible_pin = "IS_CLK_INVERTED" *)
input CLK,
input D
);
parameter [31:0] INIT = 32'h00000000;
parameter [0:0] IS_CLK_INVERTED = 1'b0;
reg [31:0] r = INIT;
assign Q31 = r[31];
assign Q = r[A];
generate
if (IS_CLK_INVERTED) begin
always @(negedge CLK) if (CE) r <= { r[30:0], D };
end
else
always @(posedge CLK) if (CE) r <= { r[30:0], D };
endgenerate
endmodule
// DSP
// Virtex 2, Virtex 2 Pro, Spartan 3.
// Asynchronous mode.
module MULT18X18 (
input signed [17:0] A,
input signed [17:0] B,
output signed [35:0] P
);
assign P = A * B;
endmodule
// Synchronous mode.
module MULT18X18S (
input signed [17:0] A,
input signed [17:0] B,
output reg signed [35:0] P,
(* clkbuf_sink *)
input C,
input CE,
input R
);
always @(posedge C)
if (R)
P <= 0;
else if (CE)
P <= A * B;
endmodule
// Spartan 3E, Spartan 3A.
module MULT18X18SIO (
input signed [17:0] A,
input signed [17:0] B,
output signed [35:0] P,
(* clkbuf_sink *)
input CLK,
input CEA,
input CEB,
input CEP,
input RSTA,
input RSTB,
input RSTP,
input signed [17:0] BCIN,
output signed [17:0] BCOUT
);
parameter integer AREG = 1;
parameter integer BREG = 1;
parameter B_INPUT = "DIRECT";
parameter integer PREG = 1;
// The multiplier.
wire signed [35:0] P_MULT;
assign P_MULT = A_MULT * B_MULT;
// The cascade output.
assign BCOUT = B_MULT;
// The B input multiplexer.
wire signed [17:0] B_MUX;
assign B_MUX = (B_INPUT == "DIRECT") ? B : BCIN;
// The registers.
reg signed [17:0] A_REG;
reg signed [17:0] B_REG;
reg signed [35:0] P_REG;
initial begin
A_REG = 0;
B_REG = 0;
P_REG = 0;
end
always @(posedge CLK) begin
if (RSTA)
A_REG <= 0;
else if (CEA)
A_REG <= A;
if (RSTB)
B_REG <= 0;
else if (CEB)
B_REG <= B_MUX;
if (RSTP)
P_REG <= 0;
else if (CEP)
P_REG <= P_MULT;
end
// The register enables.
wire signed [17:0] A_MULT;
wire signed [17:0] B_MULT;
assign A_MULT = (AREG == 1) ? A_REG : A;
assign B_MULT = (BREG == 1) ? B_REG : B_MUX;
assign P = (PREG == 1) ? P_REG : P_MULT;
endmodule
// Spartan 3A DSP.
module DSP48A (
input signed [17:0] A,
input signed [17:0] B,
input signed [47:0] C,
input signed [17:0] D,
input signed [47:0] PCIN,
input CARRYIN,
input [7:0] OPMODE,
output signed [47:0] P,
output signed [17:0] BCOUT,
output signed [47:0] PCOUT,
output CARRYOUT,
(* clkbuf_sink *)
input CLK,
input CEA,
input CEB,
input CEC,
input CED,
input CEM,
input CECARRYIN,
input CEOPMODE,
input CEP,
input RSTA,
input RSTB,
input RSTC,
input RSTD,
input RSTM,
input RSTCARRYIN,
input RSTOPMODE,
input RSTP
);
parameter integer A0REG = 0;
parameter integer A1REG = 1;
parameter integer B0REG = 0;
parameter integer B1REG = 1;
parameter integer CREG = 1;
parameter integer DREG = 1;
parameter integer MREG = 1;
parameter integer CARRYINREG = 1;
parameter integer OPMODEREG = 1;
parameter integer PREG = 1;
parameter CARRYINSEL = "CARRYIN";
parameter RSTTYPE = "SYNC";
// This is a strict subset of Spartan 6 -- reuse its model.
DSP48A1 #(
.A0REG(A0REG),
.A1REG(A1REG),
.B0REG(B0REG),
.B1REG(B1REG),
.CREG(CREG),
.DREG(DREG),
.MREG(MREG),
.CARRYINREG(CARRYINREG),
.CARRYOUTREG(0),
.OPMODEREG(OPMODEREG),
.PREG(PREG),
.CARRYINSEL(CARRYINSEL),
.RSTTYPE(RSTTYPE)
) upgrade (
.A(A),
.B(B),
.C(C),
.D(D),
.PCIN(PCIN),
.CARRYIN(CARRYIN),
.OPMODE(OPMODE),
// M unconnected
.P(P),
.BCOUT(BCOUT),
.PCOUT(PCOUT),
.CARRYOUT(CARRYOUT),
// CARRYOUTF unconnected
.CLK(CLK),
.CEA(CEA),
.CEB(CEB),
.CEC(CEC),
.CED(CED),
.CEM(CEM),
.CECARRYIN(CECARRYIN),
.CEOPMODE(CEOPMODE),
.CEP(CEP),
.RSTA(RSTA),
.RSTB(RSTB),
.RSTC(RSTC),
.RSTD(RSTD),
.RSTM(RSTM),
.RSTCARRYIN(RSTCARRYIN),
.RSTOPMODE(RSTOPMODE),
.RSTP(RSTP)
);
endmodule
// Spartan 6.
module DSP48A1 (
input signed [17:0] A,
input signed [17:0] B,
input signed [47:0] C,
input signed [17:0] D,
input signed [47:0] PCIN,
input CARRYIN,
input [7:0] OPMODE,
output signed [35:0] M,
output signed [47:0] P,
output signed [17:0] BCOUT,
output signed [47:0] PCOUT,
output CARRYOUT,
output CARRYOUTF,
(* clkbuf_sink *)
input CLK,
input CEA,
input CEB,
input CEC,
input CED,
input CEM,
input CECARRYIN,
input CEOPMODE,
input CEP,
input RSTA,
input RSTB,
input RSTC,
input RSTD,
input RSTM,
input RSTCARRYIN,
input RSTOPMODE,
input RSTP
);
parameter integer A0REG = 0;
parameter integer A1REG = 1;
parameter integer B0REG = 0;
parameter integer B1REG = 1;
parameter integer CREG = 1;
parameter integer DREG = 1;
parameter integer MREG = 1;
parameter integer CARRYINREG = 1;
parameter integer CARRYOUTREG = 1;
parameter integer OPMODEREG = 1;
parameter integer PREG = 1;
parameter CARRYINSEL = "OPMODE5";
parameter RSTTYPE = "SYNC";
wire signed [35:0] M_MULT;
wire signed [47:0] P_IN;
wire signed [17:0] A0_OUT;
wire signed [17:0] B0_OUT;
wire signed [17:0] A1_OUT;
wire signed [17:0] B1_OUT;
wire signed [17:0] B1_IN;
wire signed [47:0] C_OUT;
wire signed [17:0] D_OUT;
wire signed [7:0] OPMODE_OUT;
wire CARRYIN_OUT;
wire CARRYOUT_IN;
wire CARRYIN_IN;
reg signed [47:0] XMUX;
reg signed [47:0] ZMUX;
// The registers.
reg signed [17:0] A0_REG;
reg signed [17:0] A1_REG;
reg signed [17:0] B0_REG;
reg signed [17:0] B1_REG;
reg signed [47:0] C_REG;
reg signed [17:0] D_REG;
reg signed [35:0] M_REG;
reg signed [47:0] P_REG;
reg [7:0] OPMODE_REG;
reg CARRYIN_REG;
reg CARRYOUT_REG;
initial begin
A0_REG = 0;
A1_REG = 0;
B0_REG = 0;
B1_REG = 0;
C_REG = 0;
D_REG = 0;
M_REG = 0;
P_REG = 0;
OPMODE_REG = 0;
CARRYIN_REG = 0;
CARRYOUT_REG = 0;
end
generate
if (RSTTYPE == "SYNC") begin
always @(posedge CLK) begin
if (RSTA) begin
A0_REG <= 0;
A1_REG <= 0;
end else if (CEA) begin
A0_REG <= A;
A1_REG <= A0_OUT;
end
end
always @(posedge CLK) begin
if (RSTB) begin
B0_REG <= 0;
B1_REG <= 0;
end else if (CEB) begin
B0_REG <= B;
B1_REG <= B1_IN;
end
end
always @(posedge CLK) begin
if (RSTC) begin
C_REG <= 0;
end else if (CEC) begin
C_REG <= C;
end
end
always @(posedge CLK) begin
if (RSTD) begin
D_REG <= 0;
end else if (CED) begin
D_REG <= D;
end
end
always @(posedge CLK) begin
if (RSTM) begin
M_REG <= 0;
end else if (CEM) begin
M_REG <= M_MULT;
end
end
always @(posedge CLK) begin
if (RSTP) begin
P_REG <= 0;
end else if (CEP) begin
P_REG <= P_IN;
end
end
always @(posedge CLK) begin
if (RSTOPMODE) begin
OPMODE_REG <= 0;
end else if (CEOPMODE) begin
OPMODE_REG <= OPMODE;
end
end
always @(posedge CLK) begin
if (RSTCARRYIN) begin
CARRYIN_REG <= 0;
CARRYOUT_REG <= 0;
end else if (CECARRYIN) begin
CARRYIN_REG <= CARRYIN_IN;
CARRYOUT_REG <= CARRYOUT_IN;
end
end
end else begin
always @(posedge CLK, posedge RSTA) begin
if (RSTA) begin
A0_REG <= 0;
A1_REG <= 0;
end else if (CEA) begin
A0_REG <= A;
A1_REG <= A0_OUT;
end
end
always @(posedge CLK, posedge RSTB) begin
if (RSTB) begin
B0_REG <= 0;
B1_REG <= 0;
end else if (CEB) begin
B0_REG <= B;
B1_REG <= B1_IN;
end
end
always @(posedge CLK, posedge RSTC) begin
if (RSTC) begin
C_REG <= 0;
end else if (CEC) begin
C_REG <= C;
end
end
always @(posedge CLK, posedge RSTD) begin
if (RSTD) begin
D_REG <= 0;
end else if (CED) begin
D_REG <= D;
end
end
always @(posedge CLK, posedge RSTM) begin
if (RSTM) begin
M_REG <= 0;
end else if (CEM) begin
M_REG <= M_MULT;
end
end
always @(posedge CLK, posedge RSTP) begin
if (RSTP) begin
P_REG <= 0;
end else if (CEP) begin
P_REG <= P_IN;
end
end
always @(posedge CLK, posedge RSTOPMODE) begin
if (RSTOPMODE) begin
OPMODE_REG <= 0;
end else if (CEOPMODE) begin
OPMODE_REG <= OPMODE;
end
end
always @(posedge CLK, posedge RSTCARRYIN) begin
if (RSTCARRYIN) begin
CARRYIN_REG <= 0;
CARRYOUT_REG <= 0;
end else if (CECARRYIN) begin
CARRYIN_REG <= CARRYIN_IN;
CARRYOUT_REG <= CARRYOUT_IN;
end
end
end
endgenerate
// The register enables.
assign A0_OUT = (A0REG == 1) ? A0_REG : A;
assign A1_OUT = (A1REG == 1) ? A1_REG : A0_OUT;
assign B0_OUT = (B0REG == 1) ? B0_REG : B;
assign B1_OUT = (B1REG == 1) ? B1_REG : B1_IN;
assign C_OUT = (CREG == 1) ? C_REG : C;
assign D_OUT = (DREG == 1) ? D_REG : D;
assign M = (MREG == 1) ? M_REG : M_MULT;
assign P = (PREG == 1) ? P_REG : P_IN;
assign OPMODE_OUT = (OPMODEREG == 1) ? OPMODE_REG : OPMODE;
assign CARRYIN_OUT = (CARRYINREG == 1) ? CARRYIN_REG : CARRYIN_IN;
assign CARRYOUT = (CARRYOUTREG == 1) ? CARRYOUT_REG : CARRYOUT_IN;
assign CARRYOUTF = CARRYOUT;
// The pre-adder.
wire signed [17:0] PREADDER;
assign B1_IN = OPMODE_OUT[4] ? PREADDER : B0_OUT;
assign PREADDER = OPMODE_OUT[6] ? D_OUT - B0_OUT : D_OUT + B0_OUT;
// The multiplier.
assign M_MULT = A1_OUT * B1_OUT;
// The carry in selection.
assign CARRYIN_IN = (CARRYINSEL == "OPMODE5") ? OPMODE_OUT[5] : CARRYIN;
// The post-adder inputs.
always @* begin
case (OPMODE_OUT[1:0])
2'b00: XMUX <= 0;
2'b01: XMUX <= M;
2'b10: XMUX <= P;
2'b11: XMUX <= {D_OUT[11:0], B1_OUT, A1_OUT};
default: XMUX <= 48'hxxxxxxxxxxxx;
endcase
end
always @* begin
case (OPMODE_OUT[3:2])
2'b00: ZMUX <= 0;
2'b01: ZMUX <= PCIN;
2'b10: ZMUX <= P;
2'b11: ZMUX <= C_OUT;
default: ZMUX <= 48'hxxxxxxxxxxxx;
endcase
end
// The post-adder.
wire signed [48:0] X_EXT;
wire signed [48:0] Z_EXT;
assign X_EXT = XMUX;
assign Z_EXT = ZMUX;
assign {CARRYOUT_IN, P_IN} = OPMODE_OUT[7] ? (Z_EXT - (X_EXT + CARRYIN_OUT)) : (Z_EXT + X_EXT + CARRYIN_OUT);
// Cascade outputs.
assign BCOUT = B1_OUT;
assign PCOUT = P;
endmodule
// TODO: DSP48 (Virtex 4).
// TODO: DSP48E (Virtex 5).
// Virtex 6, Series 7.
module DSP48E1 (
output [29:0] ACOUT,
output [17:0] BCOUT,
output reg CARRYCASCOUT,
output reg [3:0] CARRYOUT,
output reg MULTSIGNOUT,
output OVERFLOW,
output reg signed [47:0] P,
output reg PATTERNBDETECT,
output reg PATTERNDETECT,
output [47:0] PCOUT,
output UNDERFLOW,
input signed [29:0] A,
input [29:0] ACIN,
input [3:0] ALUMODE,
input signed [17:0] B,
input [17:0] BCIN,
input [47:0] C,
input CARRYCASCIN,
input CARRYIN,
input [2:0] CARRYINSEL,
input CEA1,
input CEA2,
input CEAD,
input CEALUMODE,
input CEB1,
input CEB2,
input CEC,
input CECARRYIN,
input CECTRL,
input CED,
input CEINMODE,
input CEM,
input CEP,
(* clkbuf_sink *) input CLK,
input [24:0] D,
input [4:0] INMODE,
input MULTSIGNIN,
input [6:0] OPMODE,
input [47:0] PCIN,
input RSTA,
input RSTALLCARRYIN,
input RSTALUMODE,
input RSTB,
input RSTC,
input RSTCTRL,
input RSTD,
input RSTINMODE,
input RSTM,
input RSTP
);
parameter integer ACASCREG = 1;
parameter integer ADREG = 1;
parameter integer ALUMODEREG = 1;
parameter integer AREG = 1;
parameter AUTORESET_PATDET = "NO_RESET";
parameter A_INPUT = "DIRECT";
parameter integer BCASCREG = 1;
parameter integer BREG = 1;
parameter B_INPUT = "DIRECT";
parameter integer CARRYINREG = 1;
parameter integer CARRYINSELREG = 1;
parameter integer CREG = 1;
parameter integer DREG = 1;
parameter integer INMODEREG = 1;
parameter integer MREG = 1;
parameter integer OPMODEREG = 1;
parameter integer PREG = 1;
parameter SEL_MASK = "MASK";
parameter SEL_PATTERN = "PATTERN";
parameter USE_DPORT = "FALSE";
parameter USE_MULT = "MULTIPLY";
parameter USE_PATTERN_DETECT = "NO_PATDET";
parameter USE_SIMD = "ONE48";
parameter [47:0] MASK = 48'h3FFFFFFFFFFF;
parameter [47:0] PATTERN = 48'h000000000000;
parameter [3:0] IS_ALUMODE_INVERTED = 4'b0;
parameter [0:0] IS_CARRYIN_INVERTED = 1'b0;
parameter [0:0] IS_CLK_INVERTED = 1'b0;
parameter [4:0] IS_INMODE_INVERTED = 5'b0;
parameter [6:0] IS_OPMODE_INVERTED = 7'b0;
initial begin
`ifdef __ICARUS__
if (AUTORESET_PATDET != "NO_RESET") $fatal(1, "Unsupported AUTORESET_PATDET value");
if (SEL_MASK != "MASK") $fatal(1, "Unsupported SEL_MASK value");
if (SEL_PATTERN != "PATTERN") $fatal(1, "Unsupported SEL_PATTERN value");
if (USE_SIMD != "ONE48" && USE_SIMD != "TWO24" && USE_SIMD != "FOUR12") $fatal(1, "Unsupported USE_SIMD value");
if (IS_ALUMODE_INVERTED != 4'b0) $fatal(1, "Unsupported IS_ALUMODE_INVERTED value");
if (IS_CARRYIN_INVERTED != 1'b0) $fatal(1, "Unsupported IS_CARRYIN_INVERTED value");
if (IS_CLK_INVERTED != 1'b0) $fatal(1, "Unsupported IS_CLK_INVERTED value");
if (IS_INMODE_INVERTED != 5'b0) $fatal(1, "Unsupported IS_INMODE_INVERTED value");
if (IS_OPMODE_INVERTED != 7'b0) $fatal(1, "Unsupported IS_OPMODE_INVERTED value");
`endif
end
wire signed [29:0] A_muxed;
wire signed [17:0] B_muxed;
generate
if (A_INPUT == "CASCADE") assign A_muxed = ACIN;
else assign A_muxed = A;
if (B_INPUT == "CASCADE") assign B_muxed = BCIN;
else assign B_muxed = B;
endgenerate
reg signed [29:0] Ar1, Ar2;
reg signed [24:0] Dr;
reg signed [17:0] Br1, Br2;
reg signed [47:0] Cr;
reg [4:0] INMODEr = 5'b0;
reg [6:0] OPMODEr = 7'b0;
reg [3:0] ALUMODEr = 4'b0;
reg [2:0] CARRYINSELr = 3'b0;
generate
// Configurable A register
if (AREG == 2) begin
initial Ar1 = 30'b0;
initial Ar2 = 30'b0;
always @(posedge CLK)
if (RSTA) begin
Ar1 <= 30'b0;
Ar2 <= 30'b0;
end else begin
if (CEA1) Ar1 <= A_muxed;
if (CEA2) Ar2 <= Ar1;
end
end else if (AREG == 1) begin
//initial Ar1 = 30'b0;
initial Ar2 = 30'b0;
always @(posedge CLK)
if (RSTA) begin
Ar1 <= 30'b0;
Ar2 <= 30'b0;
end else begin
if (CEA1) Ar1 <= A_muxed;
if (CEA2) Ar2 <= A_muxed;
end
end else begin
always @* Ar1 <= A_muxed;
always @* Ar2 <= A_muxed;
end
// Configurable B register
if (BREG == 2) begin
initial Br1 = 25'b0;
initial Br2 = 25'b0;
always @(posedge CLK)
if (RSTB) begin
Br1 <= 18'b0;
Br2 <= 18'b0;
end else begin
if (CEB1) Br1 <= B_muxed;
if (CEB2) Br2 <= Br1;
end
end else if (BREG == 1) begin
//initial Br1 = 25'b0;
initial Br2 = 25'b0;
always @(posedge CLK)
if (RSTB) begin
Br1 <= 18'b0;
Br2 <= 18'b0;
end else begin
if (CEB1) Br1 <= B_muxed;
if (CEB2) Br2 <= B_muxed;
end
end else begin
always @* Br1 <= B_muxed;
always @* Br2 <= B_muxed;
end
// C and D registers
if (CREG == 1) initial Cr = 48'b0;
if (CREG == 1) begin always @(posedge CLK) if (RSTC) Cr <= 48'b0; else if (CEC) Cr <= C; end
else always @* Cr <= C;
if (CREG == 1) initial Dr = 25'b0;
if (DREG == 1) begin always @(posedge CLK) if (RSTD) Dr <= 25'b0; else if (CED) Dr <= D; end
else always @* Dr <= D;
// Control registers
if (INMODEREG == 1) initial INMODEr = 5'b0;
if (INMODEREG == 1) begin always @(posedge CLK) if (RSTINMODE) INMODEr <= 5'b0; else if (CEINMODE) INMODEr <= INMODE; end
else always @* INMODEr <= INMODE;
if (OPMODEREG == 1) initial OPMODEr = 7'b0;
if (OPMODEREG == 1) begin always @(posedge CLK) if (RSTCTRL) OPMODEr <= 7'b0; else if (CECTRL) OPMODEr <= OPMODE; end
else always @* OPMODEr <= OPMODE;
if (ALUMODEREG == 1) initial ALUMODEr = 4'b0;
if (ALUMODEREG == 1) begin always @(posedge CLK) if (RSTALUMODE) ALUMODEr <= 4'b0; else if (CEALUMODE) ALUMODEr <= ALUMODE; end
else always @* ALUMODEr <= ALUMODE;
if (CARRYINSELREG == 1) initial CARRYINSELr = 3'b0;
if (CARRYINSELREG == 1) begin always @(posedge CLK) if (RSTCTRL) CARRYINSELr <= 3'b0; else if (CECTRL) CARRYINSELr <= CARRYINSEL; end
else always @* CARRYINSELr <= CARRYINSEL;
endgenerate
// A and B cascade
generate
if (ACASCREG == 1 && AREG == 2) assign ACOUT = Ar1;
else assign ACOUT = Ar2;
if (BCASCREG == 1 && BREG == 2) assign BCOUT = Br1;
else assign BCOUT = Br2;
endgenerate
// A/D input selection and pre-adder
wire signed [29:0] Ar12_muxed = INMODEr[0] ? Ar1 : Ar2;
wire signed [24:0] Ar12_gated = INMODEr[1] ? 25'b0 : Ar12_muxed;
wire signed [24:0] Dr_gated = INMODEr[2] ? Dr : 25'b0;
wire signed [24:0] AD_result = INMODEr[3] ? (Dr_gated - Ar12_gated) : (Dr_gated + Ar12_gated);
reg signed [24:0] ADr;
generate
if (ADREG == 1) initial ADr = 25'b0;
if (ADREG == 1) begin always @(posedge CLK) if (RSTD) ADr <= 25'b0; else if (CEAD) ADr <= AD_result; end
else always @* ADr <= AD_result;
endgenerate
// 25x18 multiplier
wire signed [24:0] A_MULT;
wire signed [17:0] B_MULT = INMODEr[4] ? Br1 : Br2;
generate
if (USE_DPORT == "TRUE") assign A_MULT = ADr;
else assign A_MULT = Ar12_gated;
endgenerate
wire signed [42:0] M = A_MULT * B_MULT;
wire signed [42:0] Mx = (CARRYINSEL == 3'b010) ? 43'bx : M;
reg signed [42:0] Mr = 43'b0;
// Multiplier result register
generate
if (MREG == 1) begin always @(posedge CLK) if (RSTM) Mr <= 43'b0; else if (CEM) Mr <= Mx; end
else always @* Mr <= Mx;
endgenerate
wire signed [42:0] Mrx = (CARRYINSELr == 3'b010) ? 43'bx : Mr;
// X, Y and Z ALU inputs
reg signed [47:0] X, Y, Z;
always @* begin
// X multiplexer
case (OPMODEr[1:0])
2'b00: X = 48'b0;
2'b01: begin X = $signed(Mrx);
`ifdef __ICARUS__
if (OPMODEr[3:2] != 2'b01) $fatal(1, "OPMODEr[3:2] must be 2'b01 when OPMODEr[1:0] is 2'b01");
`endif
end
2'b10: begin X = P;
`ifdef __ICARUS__
if (PREG != 1) $fatal(1, "PREG must be 1 when OPMODEr[1:0] is 2'b10");
`endif
end
2'b11: X = $signed({Ar2, Br2});
default: X = 48'bx;
endcase
// Y multiplexer
case (OPMODEr[3:2])
2'b00: Y = 48'b0;
2'b01: begin Y = 48'b0; // FIXME: more accurate partial product modelling?
`ifdef __ICARUS__
if (OPMODEr[1:0] != 2'b01) $fatal(1, "OPMODEr[1:0] must be 2'b01 when OPMODEr[3:2] is 2'b01");
`endif
end
2'b10: Y = {48{1'b1}};
2'b11: Y = Cr;
default: Y = 48'bx;
endcase
// Z multiplexer
case (OPMODEr[6:4])
3'b000: Z = 48'b0;
3'b001: Z = PCIN;
3'b010: begin Z = P;
`ifdef __ICARUS__
if (PREG != 1) $fatal(1, "PREG must be 1 when OPMODEr[6:4] i0s 3'b010");
`endif
end
3'b011: Z = Cr;
3'b100: begin Z = P;
`ifdef __ICARUS__
if (PREG != 1) $fatal(1, "PREG must be 1 when OPMODEr[6:4] is 3'b100");
if (OPMODEr[3:0] != 4'b1000) $fatal(1, "OPMODEr[3:0] must be 4'b1000 when OPMODEr[6:4] i0s 3'b100");
`endif
end
3'b101: Z = $signed(PCIN[47:17]);
3'b110: Z = $signed(P[47:17]);
default: Z = 48'bx;
endcase
end
// Carry in
wire A24_xnor_B17d = A_MULT[24] ~^ B_MULT[17];
reg CARRYINr = 1'b0, A24_xnor_B17 = 1'b0;
generate
if (CARRYINREG == 1) begin always @(posedge CLK) if (RSTALLCARRYIN) CARRYINr <= 1'b0; else if (CECARRYIN) CARRYINr <= CARRYIN; end
else always @* CARRYINr = CARRYIN;
if (MREG == 1) begin always @(posedge CLK) if (RSTALLCARRYIN) A24_xnor_B17 <= 1'b0; else if (CEM) A24_xnor_B17 <= A24_xnor_B17d; end
else always @* A24_xnor_B17 = A24_xnor_B17d;
endgenerate
reg cin_muxed;
always @(*) begin
case (CARRYINSELr)
3'b000: cin_muxed = CARRYINr;
3'b001: cin_muxed = ~PCIN[47];
3'b010: cin_muxed = CARRYCASCIN;
3'b011: cin_muxed = PCIN[47];
3'b100: cin_muxed = CARRYCASCOUT;
3'b101: cin_muxed = ~P[47];
3'b110: cin_muxed = A24_xnor_B17;
3'b111: cin_muxed = P[47];
default: cin_muxed = 1'bx;
endcase
end
wire alu_cin = (ALUMODEr[3] || ALUMODEr[2]) ? 1'b0 : cin_muxed;
// ALU core
wire [47:0] Z_muxinv = ALUMODEr[0] ? ~Z : Z;
wire [47:0] xor_xyz = X ^ Y ^ Z_muxinv;
wire [47:0] maj_xyz = (X & Y) | (X & Z_muxinv) | (Y & Z_muxinv);
wire [47:0] xor_xyz_muxed = ALUMODEr[3] ? maj_xyz : xor_xyz;
wire [47:0] maj_xyz_gated = ALUMODEr[2] ? 48'b0 : maj_xyz;
wire [48:0] maj_xyz_simd_gated;
wire [3:0] int_carry_in, int_carry_out, ext_carry_out;
wire [47:0] alu_sum;
assign int_carry_in[0] = 1'b0;
wire [3:0] carryout_reset;
generate
if (USE_SIMD == "FOUR12") begin
assign maj_xyz_simd_gated = {
maj_xyz_gated[47:36],
1'b0, maj_xyz_gated[34:24],
1'b0, maj_xyz_gated[22:12],
1'b0, maj_xyz_gated[10:0],
alu_cin
};
assign int_carry_in[3:1] = 3'b000;
assign ext_carry_out = {
int_carry_out[3],
maj_xyz_gated[35] ^ int_carry_out[2],
maj_xyz_gated[23] ^ int_carry_out[1],
maj_xyz_gated[11] ^ int_carry_out[0]
};
assign carryout_reset = 4'b0000;
end else if (USE_SIMD == "TWO24") begin
assign maj_xyz_simd_gated = {
maj_xyz_gated[47:24],
1'b0, maj_xyz_gated[22:0],
alu_cin
};
assign int_carry_in[3:1] = {int_carry_out[2], 1'b0, int_carry_out[0]};
assign ext_carry_out = {
int_carry_out[3],
1'bx,
maj_xyz_gated[23] ^ int_carry_out[1],
1'bx
};
assign carryout_reset = 4'b0x0x;
end else begin
assign maj_xyz_simd_gated = {maj_xyz_gated, alu_cin};
assign int_carry_in[3:1] = int_carry_out[2:0];
assign ext_carry_out = {
int_carry_out[3],
3'bxxx
};
assign carryout_reset = 4'b0xxx;
end
genvar i;
for (i = 0; i < 4; i = i + 1)
assign {int_carry_out[i], alu_sum[i*12 +: 12]} = {1'b0, maj_xyz_simd_gated[i*12 +: ((i == 3) ? 13 : 12)]}
+ xor_xyz_muxed[i*12 +: 12] + int_carry_in[i];
endgenerate
wire signed [47:0] Pd = ALUMODEr[1] ? ~alu_sum : alu_sum;
wire [3:0] CARRYOUTd = (OPMODEr[3:0] == 4'b0101 || ALUMODEr[3:2] != 2'b00) ? 4'bxxxx :
((ALUMODEr[0] & ALUMODEr[1]) ? ~ext_carry_out : ext_carry_out);
wire CARRYCASCOUTd = ext_carry_out[3];
wire MULTSIGNOUTd = Mrx[42];
generate
if (PREG == 1) begin
initial P = 48'b0;
initial CARRYOUT = carryout_reset;
initial CARRYCASCOUT = 1'b0;
initial MULTSIGNOUT = 1'b0;
always @(posedge CLK)
if (RSTP) begin
P <= 48'b0;
CARRYOUT <= carryout_reset;
CARRYCASCOUT <= 1'b0;
MULTSIGNOUT <= 1'b0;
end else if (CEP) begin
P <= Pd;
CARRYOUT <= CARRYOUTd;
CARRYCASCOUT <= CARRYCASCOUTd;
MULTSIGNOUT <= MULTSIGNOUTd;
end
end else begin
always @* begin
P = Pd;
CARRYOUT = CARRYOUTd;
CARRYCASCOUT = CARRYCASCOUTd;
MULTSIGNOUT = MULTSIGNOUTd;
end
end
endgenerate
assign PCOUT = P;
generate
wire PATTERNDETECTd, PATTERNBDETECTd;
if (USE_PATTERN_DETECT == "PATDET") begin
// TODO: Support SEL_PATTERN != "PATTERN" and SEL_MASK != "MASK
assign PATTERNDETECTd = &(~(Pd ^ PATTERN) | MASK);
assign PATTERNBDETECTd = &((Pd ^ PATTERN) | MASK);
end else begin
assign PATTERNDETECTd = 1'b1;
assign PATTERNBDETECTd = 1'b1;
end
if (PREG == 1) begin
reg PATTERNDETECTPAST, PATTERNBDETECTPAST;
initial PATTERNDETECT = 1'b0;
initial PATTERNBDETECT = 1'b0;
initial PATTERNDETECTPAST = 1'b0;
initial PATTERNBDETECTPAST = 1'b0;
always @(posedge CLK)
if (RSTP) begin
PATTERNDETECT <= 1'b0;
PATTERNBDETECT <= 1'b0;
PATTERNDETECTPAST <= 1'b0;
PATTERNBDETECTPAST <= 1'b0;
end else if (CEP) begin
PATTERNDETECT <= PATTERNDETECTd;
PATTERNBDETECT <= PATTERNBDETECTd;
PATTERNDETECTPAST <= PATTERNDETECT;
PATTERNBDETECTPAST <= PATTERNBDETECT;
end
assign OVERFLOW = &{PATTERNDETECTPAST, ~PATTERNBDETECT, ~PATTERNDETECT};
assign UNDERFLOW = &{PATTERNBDETECTPAST, ~PATTERNBDETECT, ~PATTERNDETECT};
end else begin
always @* begin
PATTERNDETECT = PATTERNDETECTd;
PATTERNBDETECT = PATTERNBDETECTd;
end
assign OVERFLOW = 1'bx, UNDERFLOW = 1'bx;
end
endgenerate
endmodule
// TODO: DSP48E2 (Ultrascale).