Re: [myhdl-list] always_comb from a change in Signal list does not get triggered

[Günter D. <dan...@we...>]

Thomas Traber wrote:
> Günter Dannoritzer wrote:
> 
...
>>
>> I changed the code so that the pipe memory has only N-1 entries and dout 
>> being the Nth register, which worked fine. I just would like to know 
>> what I am doing wrong so that the always_comb gets not triggered anymore?
> 
> I think this is a bug in myhdl.

OK, that is good to know that I did not use it in a wrong way.

> 
> BTW, some related comments/questions:
> 
>  >       for i in downrange(N,1):
>  >         pipe[i].next = pipe[i-1]
> 
> The following should also work:
> 
> 	for i in range(1,N):
>            pipe[i].next = pipe[i-1]
> 
> It will not override, the current value because you write to the 
> next-attribute.

Good point. Did not think about that.

> 
> 
> In your simple example you could put the
> 	dout.next = pipe[N-1]
> inside the rtl1 generator so you don't need rtl2 (you probably know it, 
> your code might be a simplification).

Yes, but that will delay dout by one clock cycle, which I did not want 
to have. But replacing pipe[N-1] by dout should make it work.

Have a nice weekend too.

Guenter