From: Christopher Lu Date: Sun, 28 Dec 2008 10:23:33 +0000 (-0500) Subject: Merge branch 'master' of nyus.joshuawise.com:/git/firearm X-Git-Url: http://git.joshuawise.com/firearm.git/commitdiff_plain/4caf81e0cb02f814642cd7dc1a1d5ac05415415e?hp=6c715b10a8f5c06afe094824298b1573eebf9a2e Merge branch 'master' of nyus.joshuawise.com:/git/firearm --- diff --git a/Execute.v b/Execute.v index 5ba0a9a..e00e93d 100644 --- a/Execute.v +++ b/Execute.v @@ -19,3 +19,40 @@ module Execute( ); endmodule + +module Multiplier( + input clk, + input Nrst, /* XXX not used yet */ + + input start, + input [31:0] acc0, + input [31:0] in0, + input [31:0] in1, + + output reg done = 0, + output reg [31:0] result); + + reg [31:0] bitfield; + reg [31:0] multiplicand; + reg [31:0] acc; + + always @(posedge clk) + begin + if (start) begin + bitfield <= in0; + multiplicand <= in1; + acc <= acc0; + done <= 0; + end else begin + bitfield <= {2'b00, bitfield[31:2]}; + multiplicand <= {multiplicand[29:0], 2'b00}; + acc <= acc + + (bitfield[0] ? multiplicand : 0) + + (bitfield[1] ? {multiplicand[30:0], 1'b0} : 0); + if (bitfield == 0) begin + result <= acc; + done <= 1; + end + end + end +endmodule