set_vref

Assigns a VREF pin to a bank.

set_vref -bank [bankname][pinnum]+

Arguments

-bank bankname

Specifies the name of the bank in which the VREF pin is located. For example, for ProASIC3E and Axcelerator devices, I/O banks are numbered 0-7. Therefore, their bank names are bank0, bank1, bank2, etc.

pinnum

Specifies the alphanumeric pin name of the VREF pin(s). You must specify at least one pin number.

Supported Families

Fusion, ProASIC3E and Axcelerator

Description

Some I/O technologies need VREF settings. Some technologies may also need a minimum number of VREF pins for every certain number of input pins. These details are device dependent. Refer to the databook for your device for details. Designer can assign default VREF pins. However, the number of VREF pins Designer assigns may be too conservative, and you may not need as many VREF pins as the default assignment.

Exceptions

While the bank name is optional, you must not specify pin names that do not belong to the bank. Pins that do not belong to a bank that require a VREF are ignored.
The ProASIC3 family does not support VREF pins.

Examples

The following example assigns pins A1 and B10 from I/O bank1 as VREF pins: