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Altera_Forum
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14 years ago

Weak pull-up resistors

Hi everyone! I enabled weak pull-ups for the input and output pin (cyclone II device). But when I measure the voltage on these pins, on the input pin is 3V and on the output pin is 0V. Shouldn...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Hi dsl, thanks for joining in to help me. That is the thing that I found strange when I started using the peripheral. When I connected it first to fpga without applying the power to it, I saw it was back-powered from the input lines. Can that cause a damage to the device? If the output of the peripheral is high and the input of the fpga is tri-stated, can that make a problem too?