[manticore] Re: FIFO issues
Jeff Mrochuk
mrochuk at ee.ualberta.ca
Thu Jun 6 00:18:33 EDT 2002
I'll look into doing it with lpm ram.
On Wed, 2002-06-05 at 22:15, benjcarson at digitaljunkies.ca wrote:
> You have to use lpm_ram as registers to use esb bits, as far as I know. I
> don't think using lpm_ram is too vendor specific since I think most FPGAs
> have ram or can emulate it using normal registers. Just my $0.02.
>
> Benj
>
>
> Jeff Mrochuk writes:
>
> > Here's one for ya.
> >
> > I tried to compile my fifo, and even with only 32x8 its gigantic (14% of our
> > chip)
> > So I took a look at their design and it turns out the reason its so small is
> > because it uses ESB bits. If you disable ESB bits on the altera fifo, our
> > 640x8 fifo is 103% of the chip.
> >
> > Looks like we may have to be a bit more creative in our display, maybe empty
> > it as it fills. I'd like to know how commercial hardware does it, maybe it
> > just has giant fifo hardware.
> >
> > In the mean time, do you know if you can tell quartus to use ESB bits on your
> > own designs?
> >
> > Jeff
> >
> >
>
>
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