A logic option that specifies the VREF pin for the I/O standard being used by an I/O pin.
You can select one of the following settings:
| As VREFA | Specifies the voltage of VREFA pin as the reference voltage for the I/O standard. |
| As VREFB | Specifies the voltage of VREFB pin as the reference voltage for the I/O standard. |
| Off | Provides no input reference support. |
This option is ignored if it is applied to anything other than the I/O standard being used by an I/O pin. This option is available for MAX® 7000B devices.
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