在永远堵块内部使用电线吗? [英] Use of wire inside an always block?

问题描述

我可以在Always Block内使用电线吗? 例如:

Can I use a wire inside an always block? Like for example:

        wire [3:0]a;
        assign a=3;

        always @(c)
           begin
                d=a+c;
           end

它被编译而没有抛出任何错误.为什么?

It got compiled without throwing any error. Why?

推荐答案

是的，您可以在Always块中使用导线的值，而不能在Always块或初始块中为导线分配值.

Yes, you can use a wire's value inside an always block, you just can not assign a value to a wire in always or initial block.

导线和reg之间的唯一真正区别是分配值的语法.

The only real difference between a wire and reg is the syntax for assigning values.

在上面的示例中d也可以被创建为导线，它们是等效的:

In the above example d could also have been created as a wire, these are equivalent:

reg [3:0] answer_reg;
always @* begin
  answer_reg = a + c;
end

wire [3:0] answer_wire;
assign answer_wire = a + c;

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