06-03-2013 04:42 AM
according the Artix-7 data-sheet (DS181 (v1.6) April 17, 2013), chapter "Power-On/Off Power Supply Sequencing" on page 5 the sequencing for VCCINT, VCCBRAM, VCCAUX, and VCCO is defined.
What I'm missing is, the sequencing for VCCADC / VREFP? Is there any requirement for the sequencing for VCCADC / VREFP together with VCCINT, VCCBRAM, VCCAUX, and VCCO ?
06-04-2013 09:21 AM
The VCCADC pin should be tied to VCCAUX even if the XADC is not being used. The rest of the XADC pins can be tied to GND. I assume by VREFP you really mean the VREFP and VREFN supply pins of the XADC?
07-15-2013 11:00 AM
PROG_B is sort of a power-on reset. And yes, the supplies should rise monotonic. You don't want to have a dip around the POR thresholds for sure.