Custom data rates with Virtex 2 Pro-X MGTs

Has anyone had any experience using Xilinx RocketIO MGTs at data rates other than the PMA rates that are explicitly defined in the datasheet? I've had a fair amount of success with it, but functionality such as clock-data recovery has been troublesome for me. Because the predefined attributes for all 120 bits of the PMA configuration register seem to be geared for certain serial rates, and the documentation is vague at best in UG035, I'm pretty much left to guess and check whether or not changing any of these parameters (RXLOOPFILTER CAP, RES, for instance) might help me out.

Thanks,

Jeff

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jeffcannon
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