Answers Database
1.5i SP2 Virtex back annotation - Ngdanno issues warning stating that 100% back annotation is not possible.
Record #5851
Product Family: Software
Product Line: FPGA Implementation
Product Part: ngdanno
Product Version: 1.5i
Problem Title:
1.5i SP2 Virtex back annotation - Ngdanno issues warning stating that 100% back annotation
is not possible.
Problem 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 1:
A fix for this problem is available in the 1.5i Service Pack2:
(Xilinx Solution #5887)
End of Record #5851 - Last Modified: 03/29/99 09:37 |
