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Libraries Guide
Chapter 8: Design Elements (OAND2 to OXOR2)

ONOR2

2-Input NOR Gate with Invertible Inputs

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

ONOR2 is a 2-input NOR gate that is implemented in the output multiplexer of the XC4000X IOB. The F pin is faster than I0. Input pins can be inverted even though there is no library component showing inverted inputs. The mapper will automatically bring any inverted input pins into the IOB.