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I was able to calculate the package delay values in pico seconds by using the IBIS models from the xilinx site.

For example:

For a Virtex-5 FPGA IBIS model, the package ff323_5vlx20t_ibis.pkg is provided. Let us choose the pin B9.

From Capacitance matrix, C=1.58E-12 F/package length

From Inductance matrix, L=1.99E-09 H/package length

Delay= SQRT(C*L)=56.1 ps

Now I want convert this delay(56.1 ps) to package length(mils).

What method I need to follow for the same?

MightyBeard007
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  • As the distance involved is used to equalise the timing across a group of signals and the internal package timing is fixed, convert it to the equivalent length of track on the PCB. – Peter Smith Sep 18 '20 at 13:23
  • @PeterSmith I will convert the propagation delay value 160ps/inch to 1 pico seconds per mil, then multiply that value with 56.1ps to obtain length in mils. is it correct ? – MightyBeard007 Sep 19 '20 at 04:20

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