virtex4 distributed RAM

Distributed RAM on Virtex4. the part # we are using is : LX100-10, package FF1513. Xilinx publishes the FIFO timing info for Asynchronous FIFOs using Block RAM, but not distributed RAM. Specifically, I'd like to know the timing of all the FIFO signals (FULL/EMPTY, ALMOST_FYLL/ALMOST_EMPTY and other FIFO status signals). If someone could shed some light on where I might find this info, I'd really appreciate it.

Are you run out of block RAMs?

Distributed RAM on Virtex4. the part # we are using is : LX100-10, package FF1513. Xilinx publishes the FIFO timing info for Asynchronous FIFOs using Block RAM, but not distributed RAM. Specifically, I'd like to know the timing of all the FIFO signals (FULL/EMPTY, ALMOST_FYLL/ALMOST_EMPTY and other FIFO status signals). If someone could shed some light on where I might find this info, I'd really appreciate it.

Thank you for your quick response Peter. I'm not saying that we are going to use distributed RAM, infact we are going to use Block RAMs just as you pointed out. But, since Coregen generates Async or Sync FIFO based on either RAM, I was curious to know what the Timing model was if we ever have to use distributed RAM based FIFOs in the future. If you have any info on this I'd very much appreciate it.

I have a few more questions on the Block RAM FIFO but, I will address them through Webcase.

As an aside, I remember you from my AMD days way back in 1983-84 timeframe. I was in Clive Ghest/Steve Dines organization working on the QPDM graphics processor.

Thanks.

Nope, please see my response to Peter Alfke in this forum

Hello Peter, I changed my mind and am submitting two more questions here on Virtex4 Async FIFO for you :

1. On the Coregen tool, we could not find a button to choose between First Word Fall Through (FWFT) and Standard modes of operation

1. We have a file in our XilinxCoreLib directory called FIFO_GENERATOR_V1_1.v and it does not seem to understand FWFT either. is there a newer version of this file as well as Coregen/Fifogen tool that we need to upgrade to to get these features ?

Thanks