Keywords: CE, timing group, TNM, Ngdbuild, NGDBuild
If I create a register group in Constraint Editor, using "Advance" -> "Clock to Pad" or "Pad to setup" -> "create input register group" or "create output register group," the timegroup created by Constraints Editor does not work with NGDBuild.
TIMEGRP "test3" = INST "Source1" INST "Source2" INST "Source3";
TIMEGRP "test6" = INST "Destination2" INST "Destination3" INST "Destination4" INST "Source1";
WARNING:ConstraintSystem:56 - Constraint <TIMEGRP "test3" = INST "Source1" INST
"Source2" INST "Source3";> [ffs_1clk.ucf(21)]: Unable to find an active 'TNM'
or 'TimeGrp' constraint named 'INST'.
When this happens, the associated constraint does not get propagated to PCF. Essentially, using the advance window in Constraint Editor, I cannot create OFFSET IN or OFFSET OUT constraints with register groups.