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simple_mem.v
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simple_mem.v
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/*
* This file is part of leiwand_rv32.
* Copyright (c) 2019 Franz Flasch.
*
* leiwand_rv32 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* leiwand_rv32 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with leiwand_rv32. If not, see <https://www.gnu.org/licenses/>.
*/
`timescale 1ns/1ps
module simple_mem #(
parameter integer WORDS = 256
) (
input clk,
input rst,
input valid,
output reg ready,
input [3:0] wen,
input [31:0] addr,
input [31:0] wdata,
output reg [31:0] rdata
);
reg [31:0] mem [WORDS-1:0];
always @(posedge clk) begin
if(rst) begin
// mem[0] <= 32'h00018eb7;
// mem[1] <= 32'h00000f13;
// mem[2] <= 32'h00000e13;
// mem[3] <= 32'h001e0e13;
// mem[4] <= 32'h01de0463;
// mem[5] <= 32'hff9ff06f;
// mem[6] <= 32'h001f0f13;
// mem[7] <= 32'hfedff06f;
end
else begin
if(valid) begin
rdata <= mem[addr[(`HIGH_BIT_TO_FIT(WORDS)-1)+2:2]];
if (wen[0]) mem[addr[(`HIGH_BIT_TO_FIT(WORDS)-1)+2:2]][ 7: 0] <= wdata[ 7: 0];
if (wen[1]) mem[addr[(`HIGH_BIT_TO_FIT(WORDS)-1)+2:2]][15: 8] <= wdata[15: 8];
if (wen[2]) mem[addr[(`HIGH_BIT_TO_FIT(WORDS)-1)+2:2]][23:16] <= wdata[23:16];
if (wen[3]) mem[addr[(`HIGH_BIT_TO_FIT(WORDS)-1)+2:2]][31:24] <= wdata[31:24];
ready <= 1;
end
else begin
ready <= 0;
end
end
end
endmodule