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NuvKFC's avatar
NuvKFC
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4 years ago
Solved

How to constraint max skew between two net or balance the delay between two net?

I have two end point (two path) that need to balance the delay. The design is as follows. Path1: PAD1-->clock of module A: clock_a Path2: PAD2-->data of module A: data_a How t...
Nurina's avatar
Nurina
Icon for Regular Contributor rankRegular Contributor
4 years ago

Sorry about that. Let me try to re-upload it.

  • NuvKFC's avatar
    NuvKFC
    Icon for Contributor rankContributor
    4 years ago

    Hi Nurina

    Thank you, Nurina, very much.

    Data_a and Clock_a are in the same clock domain. So, R1 and R2 should meet the setup and hold timing.

    If I constraint the skew between R1 and R2 on the previous picture, how to know the path delay (PAD1 to Clock_a, PAD2 to Data_a) meet the requirement?

    I only constraint the net delay as follows on the paths which are from PAD1 to Clock_a and from PAD2 to Data_a.

    Constraint:

    set_net_delay -max 5.0 -from PAD1 -to clock_a

    set_net_delay -min 0.0 -from PAD1 -to clock_a

    set_net_delay -max 5.0 -from PAD2 -to data_a

    set_net_delay -min 0.0 -from PAD2 -to data_a