PI74FCT646/648/651/652T
(25Ω Series) P174FCT2646T/2652T
1234567890123456789012345678901212345678901234567890123456789012123456789012345678O90C123T45A67L890R12E12G345I6S78T90E12R34E56D789T01R234A56N78S90C12E12I3V456E78R90S12
REAL-TIME TRANSFER
BUS B TO A
REAL-TIME TRANSFER
BUS A TO B
BUS
A
BUS
B
BUS
A
BUS
B
646/648/ DIR G CPAB CPBA SAB SBA
2646 L L X
X
X
L
651/652/ GAB GBA CPAB CPBA SAB SBA
2652 L L X
X
X
L
STORAGE FROM
A AND/OR B
BUS
A
BUS
B
646/648/ DIR G CPAB CPBA SAB SBA
2646 H L X
X
L
X
651/652/ GAB GBA CPAB CPBA SAB SBA
2652 H H X
X
L
X
TRANSFER STORES
DATA TO A AND/OR B
BUS
A
BUS
B
646/648/ DIR G CPAB CPBA SAB SBA
2646 H L ↑
X
X
X
LL X
↑
X
X
XH ↑
↑
X
X
651/652/ GAB GBA CPAB CPBA SAB SBA
2652 X H ↑
X
X
X
LX X
↑
X
X
LH ↑
↑
X
X
646/648(1) DIR G CPAB CPBA SAB SBA
2646 L L X H or L X
H
H L H or L X
H
X
651/652/ GAB GBA CPAB CPBA SAB SBA
2652 H L H or L H or L H
H
1. Note: The FCT646/2646 cannot transfer data to
A bus and B bus simultaneously.
3
PS2022A 03/11/96