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Altera_Forum's avatar
Altera_Forum
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15 years ago

Same logic high ,but different voltage

Hi,guys. So why different pins have different voltage, while they are all logic high. (In my experiment,one is 1.14V, the other is 3.3V) Appreciate for any reply
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi John

AFAIK it can be one of the following cases:

- pins located on different fpga banks, configured with different voltage standards

- you have a problem in your design and 1.14V pin is driving a line which is an output from another device/pin; if this device is driving a logic low, then voltage will settle to a middle level; clearly this is not good for both the devices.

Regards

Cris