Hyperlynx : where put the probes on the FPGA : on PIN or DIE ??

Hi.

I recently have to use Hyperlynx to estimate the delay between my EP4CE75 and the DDR.

For the simulation in HYPERLYNX, i don't know what i have to choose for the location of the probes : "always at the pin" or "Always at the die" ?

Someone said me that it depends of the AC timing which is defined in the datasheet. For example, if the rising time is define at the die then i have to use "Always at the die" in hyperlynx... But i don't find this information in the datasheet.

Thank you.