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NuvKFC's avatar
NuvKFC
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3 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
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3 years ago

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

NuvKFC's avatar
NuvKFC
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3 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