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Scan Reorder issue

We have a scan connection as follows :

               FF1(from Q,SDFF)   -----------BUF ---------------FF2 (to D , DFF)
                                                                                 |
                                                                                 |
                                                                                 ________(to other logic)

Scan def :

+ORDERED
        FF1 ( IN SI ) ( OUT Q )
        FF2 ( IN D ) ( OUT Q )
+FLOATING
         ---
        ---

When i do scan reordering the tool mess with the functional path which is shown in above representation.Connects that entire logic to other flop, which is caught in lec.It does not honor the ORDERED section properly.Is there any known issue where encounter has problem handling Regular Flop (with D input as part of the scan chain) in the ORDERED section instead of a ScanFlop ?

Tried using 7.1 and 8.1USR3.

Appreciate your help.

Regards,
Vishnu

Parents

Vishnu Chada over 14 years ago

Thanks Maxb.Looks like this is an issue with placeDesign -inPlaceOpt.If i break the flow into
placeDesign
scanReorder
OptDesign -preCts
placeDesign -incremental
optDesign -preCTS -incr
scanReorder

lec was clean.
--Vishnu
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Vishnu Chada over 14 years ago

Thanks Maxb.Looks like this is an issue with placeDesign -inPlaceOpt.If i break the flow into
placeDesign
scanReorder
OptDesign -preCts
placeDesign -incremental
optDesign -preCTS -incr
scanReorder

lec was clean.
--Vishnu
Cancel
Vote Up 0 Vote Down

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