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Altera_Forum's avatar
Altera_Forum
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15 years ago

Only pins connected to the GXB transceiver blocks can use this I/O standard.

I'm creating a simple design for a new Arria II GX board and I got stuck right off the bat when trying to assign pins for the differential reference clock (PCI Express): Warning: Following 1 pi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Problem solved. It turns out that this error message is (confusingly) displayed by QII when the OUTPUT signals from the GXB instance are not assigned. Having assigned dummy output pins, the design now compiles okay.

This project is only used to validate pin assignments on my PCB before sending it to manufacturing so I had not hooked up the output signals.