General Description: This error message occurs during the timing annotation in NGDBuild.
Checking timing specifications ... WARNING:NgdHelpers:708 - Found case insensitive match for NET name "FCLK", while processing OFFSET property "OFFSET = OUT 7500.000000 pS AFTER FCLK ;".
PROGRAM ABNORMALLY TERMINATED
解决方案
A workaround is to change case of the constraints in the UCF so that the signal names have the same case as in the netlist.