From 29d6ebd961442d5df28a39dd907988480400fea6 Mon Sep 17 00:00:00 2001 From: Clifford Wolf Date: Mon, 3 Jun 2013 12:48:44 +0200 Subject: [PATCH] Implemented technology mapping for multipliers (using array multiplier) --- techlibs/stdcells.v | 34 ++++++++++++++++++++++++++++++---- 1 file changed, 30 insertions(+), 4 deletions(-) diff --git a/techlibs/stdcells.v b/techlibs/stdcells.v index e4a034c6e..01cfb9d14 100644 --- a/techlibs/stdcells.v +++ b/techlibs/stdcells.v @@ -946,7 +946,26 @@ wire [Y_WIDTH-1:0] A_buf, B_buf; endmodule -/**** +// -------------------------------------------------------- + +module \$arraymul (A, B, Y); + +parameter WIDTH = 8; +input [WIDTH-1:0] A, B; +output [WIDTH-1:0] Y; + +wire [WIDTH*WIDTH-1:0] partials; + +genvar i; +assign partials[WIDTH-1 : 0] = A[0] ? B : 0; +generate for (i = 1; i < WIDTH; i = i+1) begin:gen + assign partials[WIDTH*(i+1)-1 : WIDTH*i] = (A[i] ? B << i : 0) + partials[WIDTH*i-1 : WIDTH*(i-1)]; +end endgenerate + +assign Y = partials[WIDTH*WIDTH-1 : WIDTH*(WIDTH-1)]; + +endmodule + // -------------------------------------------------------- module \$mul (A, B, Y); @@ -961,13 +980,20 @@ input [A_WIDTH-1:0] A; input [B_WIDTH-1:0] B; output [Y_WIDTH-1:0] Y; -wire signed [A_WIDTH:0] buffer_a = A_SIGNED ? $signed(A) : A; -wire signed [B_WIDTH:0] buffer_b = B_SIGNED ? $signed(B) : B; +wire signed [Y_WIDTH:0] buffer_a = A_SIGNED ? $signed(A) : A; +wire signed [Y_WIDTH:0] buffer_b = B_SIGNED ? $signed(B) : B; -assign Y = buffer_a * buffer_b; +\$arraymul #( + .WIDTH(Y_WIDTH) +) arraymul ( + .A(buffer_a), + .B(buffer_b), + .Y(Y) +); endmodule +/**** // -------------------------------------------------------- module \$div (A, B, Y); -- 2.30.2