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//======================================================================
//
// Copyright (c) 2019, 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 modexpng_sdp_36k_x16_x32_wrapper_generic
(
clk, clk_bus,
ena, wea,
addra, dina,
enb, regceb,
addrb, doutb
);
//
// Headers
//
`include "modexpng_parameters.vh"
//
// Ports
//
input clk;
input clk_bus;
input ena;
input wea;
input [BANK_ADDR_W + BUS_OP_ADDR_W -1:0] addra;
input [ BUS_DATA_W -1:0] dina;
input enb;
input regceb;
input [BANK_ADDR_W + OP_ADDR_W -1:0] addrb;
output [ WORD_W -1:0] doutb;
//
// Memory
//
reg [BUS_DATA_W -1:0] mem[0:2**(BANK_ADDR_W+BUS_OP_ADDR_W)-1];
//
// Write Port
//
always @(posedge clk_bus)
//
if (ena && wea)
mem[addra] <= dina;
//
// Read Port
//
reg [WORD_W -1:0] doutb_reg1;
reg [WORD_W -1:0] doutb_reg2;
assign doutb = doutb_reg2;
wire [BUS_DATA_W -1:0] mem_addrb = mem[addrb[BANK_ADDR_W + OP_ADDR_W -1:1]];
wire [ WORD_W -1:0] mem_addrb_msb = mem_addrb[ BUS_DATA_W -1:WORD_W];
wire [ WORD_W -1:0] mem_addrb_lsb = mem_addrb[ WORD_W -1: 0];
always @(posedge clk)
//
if (enb)
doutb_reg1 <= addrb[0] ? mem_addrb_msb : mem_addrb_lsb;
always @(posedge clk)
//
if (regceb)
doutb_reg2 <= doutb_reg1;
endmodule
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