mirror of
https://github.com/YosysHQ/yosys
synced 2025-11-04 13:29:12 +00:00
69 lines
1.9 KiB
Verilog
69 lines
1.9 KiB
Verilog
/*
|
|
* yosys -- Yosys Open SYnthesis Suite
|
|
*
|
|
* Copyright (C) 2012 Claire Xenia Wolf <claire@yosyshq.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.
|
|
*
|
|
*/
|
|
|
|
(* techmap_celltype = "$alu" *)
|
|
module \$__SF2_ALU (A, B, CI, BI, X, Y, CO);
|
|
parameter A_SIGNED = 0;
|
|
parameter B_SIGNED = 0;
|
|
parameter A_WIDTH = 1;
|
|
parameter B_WIDTH = 1;
|
|
parameter Y_WIDTH = 1;
|
|
|
|
(* force_downto *)
|
|
input [A_WIDTH-1:0] A;
|
|
(* force_downto *)
|
|
input [B_WIDTH-1:0] B;
|
|
(* force_downto *)
|
|
output [Y_WIDTH-1:0] X, Y;
|
|
|
|
input CI, BI;
|
|
(* force_downto *)
|
|
output [Y_WIDTH-1:0] CO;
|
|
|
|
wire _TECHMAP_FAIL_ = Y_WIDTH <= 2;
|
|
|
|
(* force_downto *)
|
|
wire [Y_WIDTH-1:0] AA, BB;
|
|
\$pos #(.A_SIGNED(A_SIGNED), .A_WIDTH(A_WIDTH), .Y_WIDTH(Y_WIDTH)) A_conv (.A(A), .Y(AA));
|
|
\$pos #(.A_SIGNED(B_SIGNED), .A_WIDTH(B_WIDTH), .Y_WIDTH(Y_WIDTH)) B_conv (.A(B), .Y(BB));
|
|
|
|
(* force_downto *)
|
|
wire [Y_WIDTH-1:0] C = {CO, CI};
|
|
|
|
genvar i;
|
|
generate for (i = 0; i < Y_WIDTH; i = i + 1) begin:slice
|
|
ARI1 #(
|
|
// G = F1 = A[i] & (B[i]^BI)
|
|
// Y = F0 = A[i]^B[i]^BI
|
|
// P = Y
|
|
// ADCB
|
|
.INIT(20'b 01_11_0010_1000_1001_0110)
|
|
) carry (
|
|
.A(1'b0),
|
|
.B(AA[i]),
|
|
.C(BB[i]),
|
|
.D(BI),
|
|
.FCI(C[i]),
|
|
.Y(X[i]),
|
|
.S(Y[i]),
|
|
.FCO(CO[i])
|
|
);
|
|
end endgenerate
|
|
endmodule
|
|
|