Re: [Iverilog-devel] wrong results in simple math equation

[Martin W. <ic...@ma...>]

Using both the latest stable version of iverilog (v10.1) and the version in development (v11), both 
w0 and w1 are driven to 1'bx, which is the correct result.

thec wrote:
> `timescale 1ns/1ns
>
> // in case you did receive two copies with the same content,
> // just delete one.
> // 6/66
>
> module test;
>
>         // Outputs
>         wire w0,w1;
>
>         initial
>         begin
>                 $dumpfile("andx_gate.vcd");
>                 $dumpvars(0,test);
>         end
>
>         initial
>         begin
>                 #100 $finish(2);
>         end
>
> 	//
> 	//6/66 w0 and w1 should have the same results
> 	//
>         assign #1 w0 = 1'b 0 * (1'b 1 - 1'b x);
>         andx    andx0(.x0(1'b 0),.x1(1'b x),.y0(w1));
>
> endmodule
>
>
> module andx(x0,x1,y0);
>
> input x0,x1;
> output y0;
>
>         assign #1 y0 = x0 * (1'b 1 - x1);
>
> endmodule
>
> // have fun
> // 6/66
>
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