Re: [myhdl-list] Dual port ram, mixed width byte enables.

[Christopher F. <chr...@gm...>]

Josy,

I am not 100% sure that it is limited to only multidim, I haven't
researched this but I thought you could build mix port by using
a model of the BRAM prims (1bit width) and build them from
the simple model.  More of an elaboration / generate approach.

If that doesn't work than the user code [1] would be the quickest
alternative (as we both stated).

I think the Array will take some discussion etc. before it worked
in to the base.  It is a fairly important feature and I am sure there
will be significant feedback from the core devs.  It needs a clean
MEP etc. for discussion and review.  I don't think it is something
that can be used in the near-term.

Regards,
Chris

[1] http://docs.myhdl.org/en/stable/manual/conversion.html#user-defined-code


On Tue, Apr 19, 2016 at 9:35 AM, Josy Boelen <jos...@gm...> wrote:

> Christopher Felton <chris.felton <at> gmail.com> writes:
>
> >
> >
> >
> > On Tue, Apr 19, 2016 at 7:32 AM, Samuele Disegna <smldis <at>
> gmail.com> wrote:Yes! There is a multidimensional array that enables
> indexing of the smaller port (or the ability to have byte enables).
> >
> > Yes that will be a problem :(
> >
> > There are a couple options: first, try and rework the example without
> the multidimension array.  Second, you could use the user defined code
> and wrap the template.  That would probably be the fastest and you would
> be able to still model the same logic in myhdl just not convert the
> multidim array.
> >
>
> Chris, Samuele,
>
> It needs to be a proper multidim VHDL array to have Quartus infer an
> 'altsyncram'. You can try using one single-dimension array per byte-
> enable, but then you will end up with multiple 'altsyncram'.
> So there is only the second option left; write a model in MyHDL for the
> testbench and include 'user defined code' for conversion.
> It will be possible using the future/proposed 'myhdl.Array' type.(I have
> that working in my local branch, but with the new '@block' decorator
> making a proper PR is a lot more work. And I have indulged in a few more
> 'enhancements'. Maybe I should start sharing those first)
>
> Regards,
>
> Josy
>
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