Question

我正在尝试通过Xinlix软件使用二维数组初始化内存。代码在语法上是正确的，但它的测试平台提供了意想不到的输出。

例如：

address 0:instruction=1081601; but required output=00108101

和

address 1:instruction=1048834; required output=00100102

有谁能告诉我我的代码有什么问题？

module Imem ( address, instruction);
  input [31:0]  address;
  output     reg [31:0] instruction;

  reg [31:0]sra [0:256];integer i;

  //    I-mem is read in every cycle.
  //    A read signal could be added if necessary.
  always @(address)
  begin
    sra[32'h00000000]=32'h00108101;
    sra[32'h00000001]=32'h00100102;
    sra[32'h00000002]=32'h34100020;
    sra[32'h00000003]=32'h38100020;
    sra[32'h00000004]=32'h00108105;
    sra[32'h00000005]=32'h00108106;
    sra[32'h00000006]=32'h00108147;
    sra[32'h00000007]=32'h00100148;
    sra[32'h00000008]=32'h0010810F;
    sra[32'h00000009]=32'h00108109;
    sra[32'h0000000A]=32'h0010014A;
    sra[32'h0000000B]=32'h0010810B;
    sra[32'h0000000C]=32'h8C105555;
    sra[32'h0000000D]=32'hAC10AAAA;
    sra[32'h0000000E]=32'h31555555;
    sra[32'h0000000F]=32'h28A00000;
    sra[32'h00000010]=32'h00000000;
    sra[32'h00000011]=32'h00000000;

    for(i=32'd18;i<=32'd256;i=i+1)
        sra[i]=32'h00000000;

    instruction=sra[address];
  end

endmodule

我的测试平台是：

module instr_v_v;

    // Inputs
    reg [31:0] address;

    // Outputs
    wire [31:0] instruction;

    // Instantiate the Unit Under Test (UUT)
    Imem uut ( 
        .address(address), 
        .instruction(instruction)
    );

    initial 
    begin
        address=32'd0;
        $display($time,"address=%h,instruction=%h",address,instruction);
        // Initialize Inputs


        // Wait 100 ns for global reset to finish

        #10 address=32'd1;
        #10 address=32'd2;
        #10 address=32'd3;
        #10 address=32'd4;

        // Add stimulus here
    end

endmodule

Answer 1

看起来它工作正常，我将tb改为低于其后驱动每个地址，你等待1次单位显示该值。

波形：http://img42.com/8ED7S

这应该是输出

              11address=00000000,instruction=00108101
              22address=00000001,instruction=00100102
              33address=00000002,instruction=34100020
              44address=00000003,instruction=38100020
              55address=00000004,instruction=00108105



initial 
begin
    #10 address=32'd0;
    #1 $display($time,"address=%h,instruction=%h",address,instruction);
    // Initialize Inputs


    // Wait 100 ns for global reset to finish

    #10 address=32'd1;
      #1 $display($time,"address=%h,instruction=%h",address,instruction);
    #10 address=32'd2;
      #1 $display($time,"address=%h,instruction=%h",address,instruction);
    #10 address=32'd3;
      #1 $display($time,"address=%h,instruction=%h",address,instruction);
    #10 address=32'd4;
      #1 $display($time,"address=%h,instruction=%h",address,instruction);

    // Add stimulus here
end

在verilog中初始化二维数组

1 个答案: