system.v

debussy中文使用手册

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/* Debussy tutorial case: A simplified microprogramming-based CPU
   file name: system.v
   description: This file is used to initalize the target system 
		and set up the stimulus for the simulation
*/

`timescale 1 ns / 1ns

module system;

parameter CYCLE = 50;

reg clock;
reg reset;
wire [7:0] addr;
wire [7:0] data; 

// instantiation CPU and program rom 
CPU i_cpu(clock,reset,VMA,R_W,data,addr);
pram i_pram(clock,VMA,R_W,addr,data);

event reset_event; // declare reset_event
 
// initialization and run
initial
   begin
  	$fsdbDumpvars;
        #12600 $finish;
   end

// stimulus
// system reset
initial
   begin
        clock = 0;
        reset = 1;
        #(CYCLE/2) ->reset_event; // tirgger the event called reset_event
	reset = 0;
        #(CYCLE*4) ->reset_event; // tirgger the event called reset_event
	reset = 1;
    end

// system clock
always
   begin
        #(CYCLE*5) clock = 0;
        forever #CYCLE clock = ~clock;
   end
    
endmodule