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Altera_Forum's avatar
Altera_Forum
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10 years ago

Cyclone IV unused input in 3.3V bank tied to +1.2V

We're using the Cyclone IV EP4CE15 device in a 256-pin package. This package allows migration to the next larger device (EP4CE22), but the larger device has more VCCINT and GND pins. This requires ty...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

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I'm all in for running tests to see how these pins behave on our board, but the migration methodology comes from Altera so I'm still puzzled why there's no official information flowing from them. Has this situation never been characterized? I seriously doubt that. C'mon, Altera, cough up the goods!!

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I do recall having to do this analysis in the past ... but I don't recall seeing a warning in the Altera docs. I think I simply found the issue while trying to create a common package for a Cyclone IV device.

Did you try filing a Service Request with Altera? If not, submit one, and post the results back here.

Cheers,

Dave