Newbie looking for multiported-RAM to interface to a Spartan-III

Hi,

I'm working on a buffer-type application using a Spartan-III that
requires six bytes of data to be read and written to memory at rates of
about 100MHz. I was wondering two things:

1) Whether a Spartan-III is fast enough to send the required timing
signals for a multiported memory at this speed. If not, I'll probably
have to look into spending more money on a Virtex.
2) What companies sell multiported ram? Any suggestions will help.
Regards,
Jack Mehinsky

savingsandloan wrote:
> Hi,
>
> I'm working on a buffer-type application using a Spartan-III that
> requires six bytes of data to be read and written to memory at rates
of
> about 100MHz. I was wondering two things:
>
> 1) Whether a Spartan-III is fast enough to send the required timing
> signals for a multiported memory at this speed. If not, I'll probably
> have to look into spending more money on a Virtex.

The S3 should have no problem 100 MHz, even if it were DDR.  S3's are
more or less comparable to Virtex 2's in terms of capability.

> 2) What companies sell multiported ram? Any suggestions will help.

Assuming you have already verified that you can't fit your data in the
FPGA block RAM (even going with a really large Spartan III maybe
cheaper, lower power, and smaller, than a small S3 + external RAM), the
list is quite long and varies depending on exactly what style of
multiport you desire.

This looks to be a pretty complete list, although I wouldn't
necessarily trust the classification of one vendor into one memory type
like they have:
http://www.interfacebus.com/memory.html  

Have fun,

   Marc