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  3. COND expressions in SDF files

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COND expressions in SDF files

archive
archive over 18 years ago

Hello,

When a timing arch of a cell has COND expressions, what delay value of these conditional
expression is used for setup and hold analysis?
Considering the example below, what delay value would be used by, e.g., CTE to report delay of this cell considering timing arch C -> Q?

#####
(CELL
(CELLTYPE "ON21LX1")
(INSTANCE gbl_slave_test/g310)
(DELAY
(ABSOLUTE
(IOPATH C Q (0.076::0.076) (0.047::0.047))
(COND ((A==1'b1)&&(B==1'b1)) (IOPATH C Q (0.076::0.076) (0.047::0.047)))
(COND ((A==1'b1)&&(B==1'b0)) (IOPATH C Q (0.078::0.078) (0.057::0.057)))
(COND ((A==1'b0)&&(B==1'b1)) (IOPATH C Q (0.079::0.079) (0.076::0.076)))
(IOPATH B Q (0.106::0.106) (0.092::0.092))
(IOPATH A Q (0.082::0.082) (0.076::0.076))
)
)
)
#####

Can anyone help me?

Regards,
Cristiano.


Originally posted in cdnusers.org by clsantos
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  • archive
    archive over 18 years ago

    Thanks again lisiang.

    Will timing analyzer use worst case delays for setup analysis and best case for hold analysis?

    What is the purpose of the delay values in the right side of "IOPATH C Q"?

    What delay value will be used in case of ((A==1'b0)&&(B==1'b0))?

    Cristiano.


    Originally posted in cdnusers.org by clsantos
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  • archive
    archive over 18 years ago

    Thanks again lisiang.

    Will timing analyzer use worst case delays for setup analysis and best case for hold analysis?

    What is the purpose of the delay values in the right side of "IOPATH C Q"?

    What delay value will be used in case of ((A==1'b0)&&(B==1'b0))?

    Cristiano.


    Originally posted in cdnusers.org by clsantos
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