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//------------------------------------------------------------------------------
//
// modexp_systolic_pe_artix7.v
// -----------------------------------------------------------------------------
// Hardware (Artix-7 DSP48E1) low-level systolic array processing element.
//
// Authors: Pavel Shatov
//
// Copyright (c) 2016-2017, NORDUnet A/S
//
// 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 modexp_systolic_pe_artix7
(
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
);
reg [31: 0] t_dly;
reg [31: 0] c_in_dly;
always @(posedge clk) t_dly <= t;
always @(posedge clk) c_in_dly <= c_in;
wire [31: 0] t_c_in_s;
wire t_c_in_c_out;
reg t_c_in_c_out_dly;
always @(posedge clk) t_c_in_c_out_dly <= t_c_in_c_out;
adder32_artix7 add_t_c_in
(
.clk (clk),
.a (t_dly),
.b (c_in_dly),
.c_in (1'b0),
.s (t_c_in_s),
.c_out (t_c_in_c_out)
);
wire [63: 0] a_b;
wire [31: 0] a_b_lsb = a_b[31: 0];
wire [31: 0] a_b_msb = a_b[63:32];
reg [31: 0] a_b_msb_dly;
always @(posedge clk) a_b_msb_dly <= a_b_msb;
modexp_multiplier32_artix7 mul_a_b
(
.clk (clk),
.a (a),
.b (b),
.p (a_b)
);
wire [31: 0] add_p_s;
wire add_p_c_out;
reg [31: 0] add_p_s_dly;
always @(posedge clk) add_p_s_dly <= add_p_s;
assign p = add_p_s_dly;
adder32_artix7 add_p
(
.clk (clk),
.a (a_b_lsb),
.b (t_c_in_s),
.c_in (1'b0),
.s (add_p_s),
.c_out (add_p_c_out)
);
adder32_artix7 add_c_out
(
.clk (clk),
.a (a_b_msb_dly),
.b ({{31{1'b0}}, t_c_in_c_out_dly}),
.c_in (add_p_c_out),
.s (c_out),
.c_out ()
);
endmodule
//------------------------------------------------------------------------------
// End-of-File
//------------------------------------------------------------------------------
|
