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1.5i SP2 Virtex Bitgen - Pulldown should not be enabled on VREF pins.
The weak pulldown memory cell is currently enabled on VREF pins when it
should not be. This bug affects all Select I/O standards that use VREF.
A fix for this problem is included in 1.5i Service Pack 2. For more information see:
(Xilinx Solution #5887)
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