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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

Yes, I noticed that. The said pin(proto5_IO37) is connected not only to U22, but also U30, which means that one pin connects to two busswitch devices.

But could I measure both sides of them, 'cause I don't find any test point to check about. Another weird thing is the said pin ,which is proto5_IO37 ,is proto2_IO37 on refernce manual.