如何在不重复代码的情况下将接口绑定到多个端口？ [英] How to bind an interface to multiple ports without duplicating code?

问题描述

在此示例中，如何创建可以为模块的两个端口重用的单个接口绑定语句：

In this example, how do I create a single interface bind statement that can be reused for both ports of the module:

module adderSubtractor2(
  input            clk,
  input [7:0]      a0,
  input [7:0]      b0,
  input            doAdd0, // if this is 1, add; else subtract
  output reg [8:0] result0
`ifdef HAS_UNIT_2
  ,
  input [7:0]      a1,
  input [7:0]      b1,
  input            doAdd1, // if this is 1, add; else subtract
  output reg [8:0] result1  
`endif
);
  // ...
endmodule

interface adderSubtractor_if(
  input bit clk,
  input [7:0] a,
  input [7:0] b,
  input       doAdd,
  input [8:0] result
);
  // ...
endinterface: adderSubtractor_if

// BIND STATEMENT(S) HERE

// The test that will be run on the DUT
program automatic test(adderSubtractor_if addSub);
  initial begin
    // do stuff with interface
  end
endprogram // test

// The top level testbench.
module testbench;
  reg clk;
  adderSubtractor2 dut(.clk (clk));
  test test0(dut.adderSubtractor_if0);
`ifdef HAS_UNIT_2
  test test1(dut.adderSubtractor_if1);
`endif

  // ...
endmodule // testbench

推荐答案

我相信您正在寻找的是可参数化的界面。

I believe that what you're looking for is parametrizable interface.

一般情况下，屏蔽端口`ifdef风险很大，你必须有充分的理由这样做。关于这个主题的讨论已经这里。

In general, masking ports with `ifdef is very risky, and you must have very good reasons to do this. There has already been a discussion on this topic here.

我认为没有理由在你的情况下使用`ifdef。您可以：

I don't see any reason to use `ifdef in your case. You can:

1. 定义参数NUM_OF_INSTANCES



2. 定义所有（clk和rst除外） ）模块的端口作为压缩数组。 ie

1. define a parameter NUM_OF_INSTANCES

2. define all (except clk and rst) the ports of your module as packed arrays. i.e.

输入[1：NUM_OF_INSTANCES] [7：0] a;

input [1:NUM_OF_INSTANCES][7:0] a;

使用生成 for模块内部用于实例化多个加法器的语句

use "generate for" statement inside the module to instantiate multiple adders

希望这会有所帮助。

这篇关于如何在不重复代码的情况下将接口绑定到多个端口？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！