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Different propagation velocity on each layer

Azertyop

Hi,

I need to constraint delays in terms of timing (nS) with routing across different materials in a multilayer pcb.

I use materials with 1.43 10 e+008 m/S and 1.66 10 e+008 m/S.

How can i define these different values on each layer?

I can't define constraints in terms of length, because i have to take care of package pins delays and via delays which are timing defined only.

@+

  • steve

    I don't think you can set this by layer but you can set this by design. Look at Setup - Constraints - Modes - Electrical, and you can set velocity factors for Pin Delay and Z-Axis delay. You may be able to do a custom worksheet in Constraint Manager but you may need to try this to see if this is what you want.

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