Cyclone 5 mismatch between VCCPD and VCCIO

Thank you all for your replies

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All that can be said for certain is that the board does not follow the requirements of Altera's datasheet. Unfortunately, the board is wrong.

Does it matter? Only Altera can tell you what to expect. I suspect the FPGA will work, or appear to work, fine - but for how long...

As for connecting your 3.3V powered EPCS to a 2.5V bank - this is not likely to be an issue under any lab conditions, but may not work over all voltages and temperatures. Driving into the FPGA at 3.3V levels will be fine. However, if the 2.5V signal from the FPGA drops a little (but within the FPGA's spec) it may well be below the minimum threshold specified on the datasheet for the EPCS for a valid logic high. So, conceivably the EPCS could stop working even though the 2.5V output signals from the FPGA remain in spec. (You can check all this by looking at the datasheets for the FPGA and EPCS.)

Cheers,

Alex

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Won't the FPGA bank that has 2.5V VCCIO and is connected to the 3.3V EPCS get damaged because of this supply mismatch?