AR# 5851: 1.5i SP2 Virtex back annotation - Ngdanno issues warning stating that 100% back annotation is not possible.
AR# 5851
1.5i SP2 Virtex back annotation - Ngdanno issues warning stating that 100% back annotation is not possible.
Description
A case has been seen where ngdanno reports that 100% back-annotation is not possible, however the three reasons stated do no appear to apply to this case.
Map was not run with the -oe or -os options, there are only a few flops contained in the design (no Carry logic), and the MAP report does not give any specifics about logic being replicated during physical mapping.
Solution
A fix for this problem is available in the 1.5i Service Pack2: