microrom.v

debussy中文使用手册

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// *  of Novas Software Inc.                                              *
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/* Debussy tutorial case: A simplified microprogramming-based CPU
   file name: microrom.v
   description: This part modelize the microprogram rom

		addr: 8-bits address bus
		data: 8-bits data bus
		addr_error: address out of range
*/


`timescale 1 ns / 1 ns

module mprom(addr, dout, addr_error);
input [7:0] addr;
output [21:0] dout;
output addr_error;
reg [21:0] microrom [255:0];

 assign dout = microrom[addr]; 
 assign addr_error = ((addr>255) || (addr<0)) ? 1 : 0 ;  

initial
begin
	$readmemh("../verilog/memory/microrom.dat",microrom,0,255);
end
endmodule