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Libraries Guide
Chapter 10: Design Elements (SOP3 to XORCY_L)

UPAD

Connects the I/O Node of an IOB to the Internal PLD Circuit

XC3000
XC4000E
XC4000X
XC5200
XC9000
Spartan
SpartanXL
Spartan2
Virtex
Primitive
Primitive
Primitive
Primitive
N/A
Primitive
Primitive
Primitive
Primitive

A UPAD allows the use of any unbonded IOBs in a device. It is used the same way as a IOPAD except that the signal output is not visible on any external device pins.