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Altera_Forum
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13 years ago

state of unprogrammed or powered off fpga pins

Hi everyone, I would like to know the state of pins of an unprogrammed (blank or no config device) or powered off cyclone 4 FPGA, specifically whether it is safe to pull them up/down while in t...
Altera_Forum's avatar
Altera_Forum
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13 years ago

Driving within rated voltage range is possible, the pins are high-Z respectively expose a weak pull-up. Refer to "Hot socketing" and "Power-on-reset-circuitry" sections in device manual for details.