Re: [myhdl-list] Modules interface information

[Oscar D. <osc...@gm...>]

2011/5/5 Günter Dannoritzer <dan...@we...>:
> Am 05.05.2011 12:00, schrieb Oscar Diaz:
> ...
>> In traditional HDL you have a well-defined interface in the modules:
>> i.e. VHDL has entity declarations with generics and ports, each with a
>> well-defined type. So, you can easily create an IP core and someone
>> can easily see the entity description and hopefully use it correctly.
>
> I agree that you need some documentation about what is an input, output,
> or parameter. But there is some advantage to not specify the port too
> specific. You can create the code in a generic way and specify by the
> interfacing signals its behavior. No need to specify whether the input
> is 8 bit or 16 bit wide. The internal logic will determine it by the
> specified interface signal. - Though works only for input signals. When
> I tried this the last time for output signals, the convertor got
> confused, because I was using information from the output signal and it
> thought I tried to use it as an input.
>
> One interesting idea is conditional instantiation as shown in the manual
> based on a parameter:
>
> http://www.myhdl.org/doc/current/manual/modeling.html#conditional-instantiation
>
> I haven't tested that, but assume you could do it based on the signal
> type as well. So if the interface signal is of type intbv, use some
> implementation that is e.g. different from the implementation than the
> implementation when the input signal is a bool type. ... or any other
> type you can imagine.

Another point in favor with my colleagues. However there are some
cases when you need to pass an explicit parameter, i.e. a constant
that must be different for each instances of the same module.

>
> Cheers, Guenter
>
> ------------------------------------------------------------------------------
> WhatsUp Gold - Download Free Network Management Software
> The most intuitive, comprehensive, and cost-effective network
> management toolset available today.  Delivers lowest initial
> acquisition cost and overall TCO of any competing solution.
> http://p.sf.net/sfu/whatsupgold-sd
> _______________________________________________
> myhdl-list mailing list
> myh...@li...
> https://lists.sourceforge.net/lists/listinfo/myhdl-list
>



-- 
Oscar Díaz
Huella de clave = 904B 306C C3C2 7487 650B  BFAC EDA2 B702 90E9 9964
gpg --keyserver subkeys.pgp.net --recv-keys 90E99964

Recomiendo usar OpenDocument Format
para uso e intercambio de documentos

http://www.spreadopendocument.org/