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.