Answers Database
LCA2XNF may use unit delays (functional) in timing simulation flow
Record #1085
Product Family: Software
Product Line: XACT FPGA
Product Part: lca2xnf
Product Version: 5.2
Problem Title:
LCA2XNF may use unit delays (functional) in timing simulation flow
Problem Description:
A user may observe in some cases, his timing simulation looks like a
functional simulation. This can be caused by LCA2XNF writing out an XNF file with no delay informat
ion annotated. LCA2XNF may do this if the LCA file has
DRC errors; it will use unit delays instead. If XSIMMAKE was run, this will
be reported in the XSIMMAKE.OUT file (WARNING 23).
Solution 1:
Run a DRC check via XDE or Makebits to check if the LCA file is really OK.
If there are any errors, you must re-run PPR and/or adjust your design until
DRC check passes. PPR will sometimes produce LCA files that have DRC errors.
These errors are normally caught when Makebits is run, since Makebits runs
the DRC check automatically, but there is no such filter in Xsimmake.
End of Record #1085 - Last Modified: 12/18/96 15:38 |
