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wb_bootrom.v
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wb_bootrom.v
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/*
* wb_rom Generic on-chip ROM with Wishbone interface
* Copyright (C) 2015 Olof Kindgren, olof.kindgren@gmail.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
module wb_bootrom
#(parameter DEPTH = 0, // Memory size in bytes
parameter WB_AW = $clog2(DEPTH), // Wishbone address width
parameter MEMFILE = "") // Initialization file
(input wb_clk_i,
input wb_rst_i,
input [31:0] wb_adr_i,
input wb_cyc_i,
input wb_stb_i,
output reg [31:0] wb_dat_o,
output reg wb_ack_o);
reg [31:0] mem[0:DEPTH/4-1];
wire [WB_AW-1:0] adr = wb_adr_i[WB_AW-1:2];
always @(posedge wb_clk_i) begin
wb_ack_o <= wb_stb_i & wb_cyc_i & !wb_ack_o;
wb_dat_o <= mem[adr];
end
initial
if(MEMFILE == "")
$display("%m : Warning! Memory is not initialized");
else begin
$display("Preloading boot ROM from %s", MEMFILE);
$readmemh(MEMFILE, mem);
end
endmodule