We have just bought a new Virtex4 based devleopment board, but were having alot of trouble with the on-chip block RAM. This same design run successfully on a Virtex2 board. We were running ISE 6.3.
We just got ISE 7.1 and our problems have gone away. Just a warning to any who might be having problems with Virtex4 block RAMs and are using ISE 6.3, upgrade to ISE 7.1 ASAP.
Luke Darnell
having
to any
ISE 6.3,
Howdy Luke,
I have two designs that I've brought over to V4 from a V2Pro... both worked fine with 6.3.3i, and both use a large number of the BRAM's in many different configurations (FIFO's, single port, and dual port). Is it possible the RAM mode (read-first vs. write-first) isn't set the way it needs to be? We've seen inconsistant results when it wasn't set correctly.
Have fun,
Marc
Luke, Can you be more specific what kind of trouble you had (have) with the block ram or can you provide a testcase if you have isolated the problem to brams Thanks,
Aurash
Luke Darnell wrote:
of trouble with the on-chip block RAM. This same design run successfully on a Virtex2 board. We were running ISE 6.3.
might be having problems with Virtex4 block RAMs and are using ISE 6.3, upgrade to ISE 7.1 ASAP.
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