Answers Database

M1.4 Timing Analyzer reports "0 items analyzed" on a period constraint.


Record #3285

Product Family:  Software

Product Line:  FPGA Implementation

Problem Title:
M1.4 Timing Analyzer reports "0 items analyzed" on a period constraint.


Problem Description:
When timing analysis is performed, if a PERIOD constraint and a FROM:TO cover th
e same path, the PERIOD constraint is overidden. This causes the path to only be
 reported under the FROM:TO constraint.

This conflict normally occurs when using the OFFSET constraint with an associate
d PERIOD constraint and the FROM:TO constraint.  These two constraints perform s
imilar analysis and normally only one of them is needed.


Solution 1:

This is correct behavior. The user needs to decide what type of constraint that
he wants to use.

If the user wants to use the PERIOD constraint the solution is to remove the FRO
M:TO constraint. Then the paths are reported under the PERIOD constraint.




End of Record #3285