gr.v

cup 的设计源代码

`timescale 1ns / 1ps
////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer:
//
// Create Date:    18:59:32 10/08/08
// Design Name:    
// Module Name:    GR
// Project Name:   
// Target Device:  
// Tool versions:  
// Description:
//
// Dependencies:
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
////////////////////////////////////////////////////////////////////////////////
module GR(clk, rst, GR_in, GR_address, load_enable, GR_out);

    parameter width=8;
    
    input clk;
    input rst;
    input[width-1:0] GR_in;
    input [2:0] GR_address;
    input load_enable;
    output[width-1:0] GR_out;

    reg[width-1:0] GR_out;
    reg[width-1:0] register[7:0];
    
    always@(posedge clk or negedge rst)
    begin
        if(~rst)
        begin
         register[0]<='b0;
			register[1]<='b0;
			register[2]<='b0;
			register[3]<='b0;
			register[4]<='b0;
			register[5]<='b0;
			register[6]<='b0;
			register[7]<='b0;
        end
        else if(load_enable)
        begin
            case(GR_address)
            'b000:register[0]<=GR_in;
            'b001:register[1]<=GR_in;
            'b010:register[2]<=GR_in;
            'b011:register[3]<=GR_in;
            'b100:register[4]<=GR_in;
            'b101:register[5]<=GR_in;
            'b110:register[6]<=GR_in;
            'b111:register[7]<=GR_in;
            endcase
        end
    end
    
    always@(GR_address or register[0] or register[1] or register[2] or register[3]
            or register[4] or register[5] or register[6] or register[7])
    begin
        case(GR_address)
        'b000:GR_out=register[0];
        'b001:GR_out=register[1];
        'b010:GR_out=register[2];
        'b011:GR_out=register[3];
        'b100:GR_out=register[4];
        'b101:GR_out=register[5];
        'b110:GR_out=register[6];
        'b111:GR_out=register[7];
        endcase
    end

endmodule