Xilinx XC4000 Series

XC4000 Series Field Programmable Gate Arrays
4-22 September 18, 1996 (Version 1.04)
DQ
S/R
EC
YQ
Y
DIN
H
G
F
G
H
DQ
S/R
EC
XQ
DIN
H
G
F
H
X
H
F
G
G4
G3
G2
G1
F
F3
F2
F1
F4
F
CARRY
G
CARRY
C
C
DOWN
CARRY
LOGIC
D
CC
UP
K S/R EC
H1
X6699
OUT
IN
OUT
IN
IN
C
OUT0
Figure 13: Fast Carry Logic in XC4000E CLB (shaded area not present in XC4000EX)