VREF group Definition
A group of I/O pins associated with a VREF
pin that
are grouped for the purpose of specifying voltage. Each
VREF
group is associated with a specific I/O bank, and
all of the pins in a VREF
group must use the same
VREF
voltage.
The format of a VREF
group location is
VREFGROUP_B<number>_N<number>
,
where B<number>
represents the I/O bank
number and N<number>
represents the VREF
index within the I/O bank. For example, the
Quartus® Prime
Settings File (.qsf) setting for a VREF
group
assignment is:
set_location_assignment VREFGROUP_B3_N2 -to clock
For supported device (
Arria® series,
Cyclone®
series, and
Stratix® series) family devices you can assign
nodes and entities to VREF
groups using the Assignment
Editor, Pin Planner, and Chip Planner.