PI74LCX16646
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REAL-TIME TRANSFER
BUS B TO A
BUS
A
BUS
B
REAL-TIME TRANSFER
BUS A TO B
BUS
A
BUS
B
xDIR xOE CLKAB CLKBA xSAB xSBA
L
L
X
X
XL
STORAGE FROM
A AND/OR B
BUS
A
BUS
B
xDIR xOE CLKAB CLKBA xSAB xSBA
H
L
X
X
LX
TRANSFER STORES
DATA TO A AND/OR B
BUS
A
BUS
B
xDIR xOE CLKAB CLKBA xSAB xSBA
H
L
↑
X
X
X
L
L
X
↑
X
X
X
H
↑
↑
X
X
xDIR(1)
L
H
xOE
L
L
CLKAB CLKBA xSAB xSBA
X
H or L X H
H or L
X
HX
Note:
1. Cannot transfer data to A bus and B bus simultaneously.
3
PS2093B 09/20/02