Article ID: 000079278 Content Type: Troubleshooting Last Reviewed: 01/01/2015

Do I need to use all the VREF's in the same bank in a Cyclone device as VREF's, or can I use some as VREF and some as user I/O?

Environment

BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

No, you do not need to use all VREF's in one bank as VREF's. Each pin's reference to VREF is contained in a group. Therefore, if a certain group of pins are using a VREF, the other VREF's in the same bank may be used as regular I/O if their groups do not need them to be VREF's. You can find out the groupings of VREF's by looking at the second column of the Cyclone® series device pinout. It illustrates which pins use which VREF's.

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Cyclone® FPGAs