I'm using a VIIPro with Bank 4 Vcco set to 3.3V. The PROM is an XCF04S which has separate Vccint (must be 3.3V), Vccjtag and Vcco (can be 2.5 / 3.3V) connections. I'm a little confused as the FPGA has some configuration pins that are 2.5V (Vccaux) which apparently cannot be driven to 3.3V but in the datasheet it states that the configuration device Vcco and the FPGA Vcco need to be the same value. If I could use 2.5V I would but in this case it has to be 3.3V.
I might have figured this out OK but the datasheet information on the PROM and FPGA seem to contradict in some places. Does anyone have any experience of doing this and any advice that would be useful?
So far I've put a 4K7 pull-up to 3.3V on the OE/Reset to Init_B line, a 4K7 pull-up to 2.5V on the CF to ProgB line and a 4K7 pull-up to 2.5V on the nCE to DONE line. On the PROM all Vccs are 3.3V. A screenshot of the diagram is available at the link:
TIA for any help.
Rog.