From caea5e361940c0d445a7d90446641a637c6d49cc Mon Sep 17 00:00:00 2001 From: "Pavel V. Shatov (Meister)" Date: Sat, 1 Jul 2017 22:26:32 +0300 Subject: Started porting generic multiplier to Xilinx primitives. --- src/rtl/pe/generic/multiplier32_generic.v | 85 +++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 src/rtl/pe/generic/multiplier32_generic.v (limited to 'src/rtl/pe/generic/multiplier32_generic.v') diff --git a/src/rtl/pe/generic/multiplier32_generic.v b/src/rtl/pe/generic/multiplier32_generic.v new file mode 100644 index 0000000..794ce96 --- /dev/null +++ b/src/rtl/pe/generic/multiplier32_generic.v @@ -0,0 +1,85 @@ +//====================================================================== +// +// modexpa7_pe_mul.v +// ----------------------------------------------------------------------------- +// Low-level processing element (multiplier). +// +// Authors: Pavel Shatov +// +// Copyright (c) 2017, NORDUnet A/S All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions +// are met: +// - Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// +// - Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// +// - Neither the name of the NORDUnet nor the names of its contributors may +// be used to endorse or promote products derived from this software +// without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS +// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED +// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED +// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR +// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF +// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING +// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +//====================================================================== + +module multiplier32_generic + ( + input clk, + input [31: 0] a, + input [31: 0] b, + input [31: 0] t, + input [31: 0] c_in, + output [31: 0] p, + output [31: 0] c_out + ); + + // + // Customizable Latency + // + parameter LATENCY = 4; + + // + // Delay Line + // + reg [63: 0] abct[1:LATENCY]; + + // + // Outputs + // + assign p = abct[LATENCY][31: 0]; + assign c_out = abct[LATENCY][63:32]; + + // + // Sub-products + // + wire [63: 0] ab = {{32{1'b0}}, a} * {{32{1'b0}}, b}; + wire [63: 0] ct = {{32{1'b0}}, c_in} + {{32{1'b0}}, t}; + + // + // Delay + // + integer i; + always @(posedge clk) + // + for (i=1; i<=LATENCY; i=i+1) + abct[i] <= (i == 1) ? ab + ct : abct[i-1]; + +endmodule + +//====================================================================== +// End of file +//====================================================================== -- cgit v1.2.3