Dieter wrote:
The crystal has negligable jitter. It's the DCM in the Xilinx chip
that's introducing all of the noise. A lot of it comes from ground
bounce and crosstalk from other activity in the FPGA.
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. :-(
Ground bounce occurs inside of all high speed chips (and in the bonding
wires and package traces). It remains one of the great unsolved problems.
--
JRT
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