11-10-2017 02:45 PM
I have an input diff pair configured as DIFF_SSTL12_DCI on a VU13P device. The POS side is centered around 0.52V and the NEG side is centered around 0.69V. They should both be centered at 0.6V. Is there a way to see what the DCI circuitry thinks the resistor value should be? Is there a way to check if the 2R pullup and 2R pulldown are the same or not (see ug571 v1.7 figure 1-68).
11-11-2017 11:42 PM
11-13-2017 11:19 AM
We already tried DCIReset, it didn't change the behavior. We weren't sure if we put it in the right place; the documentation is unclear about how many DCIResets there are and where they need to be. Is there one per SLR? Or one per I/O bank?
11-13-2017 02:24 PM
11-15-2017 01:15 PM
Can we see a scope shot of both the driving and tri stated cases?