AJ3 and AK3 are CM_LVDS3_N / P pins, while B25 and C25 are LVDS_OSC_N / _P pins.
Differential pairAJ3 AK3 should havethe IOSTANDARD LVDS associated with them.
Differential pair B25 C25 should have the IOSTANDARD LVDS_25 associated with them.
This has been corrected in v1.0 of the Master UCF, available on the public KC724 Board Files page: http://www.xilinx.com/support/documentation/kc724_14-3_bf.htm
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