generate_rom.py

#!/usr/bin/python2.7 -u

from struct import unpack;
import sys

if len(sys.argv) < 2:
    print "Usage: %s <rom file>" % sys.argv[0]
    exit(1)

template = """/* AUTOGENERATED see generate_rom.py */
module rom (
    input clk,
                          
    input mem_valid,
    output reg mem_ready,
    input [31:0] mem_addr,                   
    output reg [31:0] mem_rdata,                   
    input [31:0] mem_wdata,
    input [3:0] mem_wstrb 
);
    localparam DEPTH = 8;
    localparam WORDS = 1 << DEPTH;

    reg [31:0] rom [0:WORDS-1];

    integer i;
    initial begin
        for(i = 0; i < WORDS; i = i + 1) rom[i] <= 32'h00000000;
##ROM##
    end

    wire [DEPTH-1:0] addr = mem_addr[DEPTH-1+2:2];

    always @(posedge clk) begin
        mem_ready <= 0;
        if(mem_valid && !mem_ready) begin
            mem_ready <= 1;
            mem_rdata <= rom[addr];
        end
    end
endmodule"""

rom = []
data = open(sys.argv[1], "r").read()
i = 0;
while len(data) >= 4:
    word, data = data[:4], data[4:]
    rom.append("        rom[%i] <= 32'h%s;" % (i, word[::-1].encode("hex")));
    i += 1;

rom = "\n".join(rom)
print template.replace("##ROM##", rom)