Answers Database
1.5i Virtex Back Annotation - Ngdanno issues warning stating that 100% back annotation is not possible
Record #5520
Product Family: Software
Product Line: FPGA Implementation
Product Part: ngdanno
Problem Title:
1.5i Virtex Back Annotation - Ngdanno issues warning stating that 100% back annotation is
not possible
Problem Description:
A Virtex case has been seen where ngdanno reports that 100% back-annotation is not possible, howeve
r 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 included in the 1.5i Service Pack 1. For details
on this Service Pack see http://www.xilinx.com/techdocs/5514.htm
End of Record #5520 - Last Modified: 02/10/99 14:06 |
