K7 GTX receive ok but not stable (pattern sensitive)

Hi,
I made a sensor with 8b10b TX fit Xilinx K7 GTX,
The data transfer is ok now, but not stable,
some special code (pattern) have higher error possibility.
Is there any part can be tuned to decrease the error rate?
or any document can be refer to? Thanks !!
 

Dear Austin,
Thanks for the reply,
I use same speed, cable, connnectors, and protocol, for both my TX IC & Xilinx K7 TX,
Xilinx K7 is ok, signal swing 800mV diff p-p,  my TX IC can only 400mV diff p-p, (in spec)
my TX IC eye diagram jitter is larger than K7, but should be in spec (0.35UI, if I understand correctly).
improve my TX refernce clock source quality, TXPLL loop bandwidth, and K7 GTX RXEQ (from DFE-->LPM) can help,
but still has annoying specific symbol error,
the AC couple cap is 0.1uF, for 1.25Gbps & 2.5Gbps 8b10b,
Is there any spec for comma usage ? comma-to-comma maximum spacing or better comma type ?
since DFE-->LPM RXEQ improve a lot, how can I tune RXEQ parameters ?
Thanks and Best Regards,
 

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