Virtex4 Block Ram : ISE6.3 Problem

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

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Luke Darnell
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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

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Marc Randolph

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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Aurelian Lazarut

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