Dieter wrote:
Are you saying that there is ground bounce and crosstalk *inside*
the FPGA? Kinda hard to beef up the ground inside someone else's
chip. :-(
But there are routing options. Here's from the spartan3 spec:
Digital Clock Manager (up to four DCMs) - Clock skew elimination - Frequency synthesis - High resolution phase shifting Eight
global clock lines and abundant routing
Redoing the routing with other global clock lines in different locations could
help.
900ps --> 100ps sounds too far.
John G
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