$display vs $strobe vs $monitor in verilog? [英] $display vs $strobe vs $monitor in verilog?

问题描述

verilog 中的 $display vs $strobe vs $monitor 有什么区别?当在事件队列中时，每个都适用，语句如何交互?任何声明都可以抑制另一个声明吗?

What is the difference between $display vs $strobe vs $monitor in verilog? When in the event queue does each apply, and how do the statements interact? Can any statement inhibit another?

推荐答案

我会很好地总结LRM(语言参考手册)，但您应该阅读它.一切都在IEEE Std 1800-2012 §21.2 显示系统任务(技术上是SystemVerilog，但这些功能是相同的.)

I'll be nice and summarize the LRM (Language Reference Manual), but you should read it. Everything is in IEEE Std 1800-2012 § 21.2 Display system tasks (Technically SystemVerilog, but these functions are identical.)

• $display : 打印立即数
  • §21.2.1 显示和写入任务
  • $display : print the immediate values
    • § 21.2.1 The display and write tasks
    • §21.2.2 选通监控
    • §21.2.3 持续监控
    • §21.2.1 显示和写入任务

    示例:

    reg [3:0] a,b;
    integer i;
    initial begin
      $monitor("monitor a:%h b:%h @ %0t", a, b, $time);
      for(i=0; i<4; i=i+1) begin
        $strobe("strobe  a:%h b:%h @ %0t", a, b, $time);
        $display("display a:%h b:%h @ %0t", a, b, $time);
        case(i)
          0 : a = 4;
          1 : b = 1;
          2 : begin end // do nothing
          3 : {a,b} = 9;
        endcase
        $display("display a:%h b:%h @ %0t", a, b, $time);
        #1;
      end
    end
    

    输出:(注意打印顺序和那个监视器在时间 2 没有显示)

    Outputs: (notice the print order and that monitor is not displayed at time 2)

    显示 a:x b:x @ 0
    显示 a:4 b:x @ 0
    监视器 a:4 b:x @ 0
    频闪 a:4 b:x @ 0
    显示 a:4 b:x @ 1
    显示 a:4 b:1 @ 1
    监视器 a:4 b:1 @ 1
    频闪 a:4 b:1 @ 1
    显示 a:4 b:1 @ 2
    显示 a:4 b:1 @ 2
    频闪 a:4 b:1 @ 2
    显示 a:4 b:1 @ 3
    显示 a:0 b:9 @ 3
    监视器 a:0 b:9 @ 3
    频闪 a:0 b:9 @ 3

    display a:x b:x @ 0
    display a:4 b:x @ 0
    monitor a:4 b:x @ 0
    strobe a:4 b:x @ 0
    display a:4 b:x @ 1
    display a:4 b:1 @ 1
    monitor a:4 b:1 @ 1
    strobe a:4 b:1 @ 1
    display a:4 b:1 @ 2
    display a:4 b:1 @ 2
    strobe a:4 b:1 @ 2
    display a:4 b:1 @ 3
    display a:0 b:9 @ 3
    monitor a:0 b:9 @ 3
    strobe a:0 b:9 @ 3

    这篇关于$display vs $strobe vs $monitor in verilog?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！