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XWang134
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6 years ago

Arria 10 3V I/O connect to 3.3V device

I have a broad with an arria 10 FPGA (10AX066N2F40), using a 2.5V VCCIO for 3V I/O bank 2L, and bank 2L connects directly to a MCU supplied by a 3.3V power. It mentions that VIH max=3.3V when VCCIO=...
XWang134's avatar
XWang134
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6 years ago

Hi JwChin,

Yes, VCCIO return to 2.5V after MCU output disabled.

I see it is abnormal while VCCIO pull to 2.7V, but I can't find where the leakage is, all other components powerd by both 2.5V and 3.3V is removed from the board.

I tried that solder a resistor (200 Ohm) acorss VCCIO and GND, for emulating a lite load, then 2.7V came down to 2.6V.

It seems that the regulator of VCCIO 2.5V have not the function of sink current.

I could set the 3.3V down to 3.2V, and set the 2.5V up to 2.6V, avoid doing modification of PCB, and bring VCCIO to safety zone.

Regards,

Wang