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

XORCY_D

XOR for Carry Logic with Dual Output

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

XORCY_D is a special XOR used for generating faster and smaller arithmetic functions.

XORCY_D has two functionally identical outputs, O and LO. The O output is a general interconnect. The LO output is used to connect to another output within the same CLB slice.

See also “XORCY” and “XORCY_L.”