This is caused by a dangling CIN net with no driver. This net should have been trimmed by Map but was not. The resulting DRC issue is an error in bitgen.
ERROR:xvkdr:3 - blockcheck: Dangling CYINIT input. CYINIT of comp io_int/cmd_fifo_reg_1[6] is configured to use pin CIN, but pin CIN is not connected.
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1
This problem can be worked around by deleting the stub in the routed ncd in EPIC and then running bitgen.
This problem is corrected in the 2.1i release due to ship in June.
2
Turn off the DRC when running bitgen. Use the -d option in the utilities->customize-> template manager.