When generating a ChipScope ICON core targeting a Spartan device, I see the following messages:
x: Could not find net(s) 'U0/U_ICON/iDRCK' in the design. To suppress this error specify the correct net name or remove the constraint.
ERROR:Parsers:11 - Encountered unrecognized constraint while parsing.
ERROR:NgdBuild:134 - Unable to process the "/path/chipscope_icon_0.ncf" constraints file; please see the above messages for details.
How can I work around this issue?
This is a known issues and is resolved in ChipScope Pro and ISE 10.1 Service Pack 3.