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Altera_Forum's avatar
Altera_Forum
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10 years ago

VCCIO and IO standard difference

hi, I have cyclone IV GX Device, VCCIO of the bank is 3.3V. However, in Quartus project there 2.5V standard as input and output setting. There is basicly 4 signals in that bank, 2 inputs and 2 o...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

Hi Tero.

The setting change on it's own won't break the FPGA, but overshoot on 3.3 data lines may. It's recommended clamp diodes are used in most cases.

I would just fix the Quartus project and recompile. If it's happy with 3.3 then you are all good and have no worries.

(Sorry for the late reply, I just saw your response today.)

Pete