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Virtex 5 PCB Designers Guide: required capacitors

Hi all,

I've some trouble designing a virtex 5 board. I use the "Xilinx Virtex

5 LX development kit" schematic ( provided by Avnet ) as model, and the Xilinx App Note "Virtex 5 PCB User guide 203".

My problem is about the capacitors required by the FPGA. In the pcb user guide, there is a section wich details the list of required capacitors / slices. Capacitors used are 330uF, 2.2uF, and 220nF. But I was surprised when I look at the "Xilinx Virtex 5 LX development kit" schematic, because only 100uF, 2.2uF, 100nF and a lot of 1nF are used.. there is a lot of differences between the two..

So my question is, what do you think about that ? and what will you advice to me ? Do you think it would be better if I add 1nF capacitors for very high frequencies variations ?

Thanks by advance,

Best regards, Michel.

Reply to
michel.talon
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Hi Michel, Instead of starting yet another thread on bypass caps, perhaps you could go and read the ones we've already had? There's plenty to choose from. Google groups or fpga-faq.com for comp.arch.fpga . If you want the latest and greatest technology, do a google search for X2Y caps. Cheers, Syms.

Reply to
Symon

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