Re: [myhdl-list] Re: Tristate logic (newbie question)

[Tom D. <td...@di...>]

I agree with you dislike for tri-states.

I like the fact that a None signal causes a problem that you have to fix=20
before your simulation works.

If we are talking about I/O tri-states, then it can easily be solved=20
with an HDL wrapper and bringing out of the MyHDL code the date_o,=20
data_i and data_oe signals.

Tom


Jan Decaluwe wrote:

> Jos=E9 Pedro Matos wrote:
>
>> hello to all.
>>
>> Is any solution for the tristate question been resolved?
>
>
> Bom dia, tudo bem? :-)
>
> Not much has been done - I still hate tristates as much as then :-)
> However, in the development version, I have started to support None as
> as a value for an intbv slice, by removing the bound checks if
> the value is None. This was done to support things like:
>
>    intbv()[8:]
>
> in list of signal definitions (for memory inference in toVerilog).
>
>>
>> The first example that i make in verilog and in vhdl is to put a value
>> in the data bus when READ_Z and ChipSelect_Z go down and then put the
>> bus in high impedance when the chip is not selected. I see it work fin=
e.
>> I'm happy.
>>
>> I tried to generate the same hdl in myhdl. Not happy.
>>
>> I would like to use myhdl, because python is on my self-learning path,
>> because for what i've read i believe in xp programming and i see lot o=
f
>> good things comming from python people.
>>
>> Can someone help me?
>> I could try hack the code. Has someone done that?
>
>
> Hacking the code is fine, a discussion on how things should work,
> in full detail, even better :-)
>
>> Why there is no CVS for this project?
>
>
> (Note: I do use CVS locally to manage the source code.)
>
> To main reasons why there is not yet a public CVS repository:
>
> 1. In my judgement, it was not the most urgent functionality
> for the project, considering the stage it is in.
> 2. I hoped that by the time a public repo would be useful, there
> would be a better alternative to CVS available, perhaps a
> distributed version control system.
>
> Best regards,
>
> Jan
>