16
COMMERCIALTEMPERATURERANGE
IDT72V3624/72V3634/72V3644 3.3V CMOS SyncBiFIFOTM WITH BUS-MATCHING
256 x 36 x 2, 512 x 36 x 2, 1,024 x 36 x 2
Figure 2. Bus Sizing
A35 A27
A26 A18
A17 A9
A8 A0
B35 B27
B26 B18
B17 B9
B8 B0
A
D
A
C
B
C
B
D
C
A
D
B
(a) LONG WORD SIZE
(b) WORD SIZE
BIG ENDIAN
(c) WORD SIZE
LITTLE-ENDIAN
(d) BYTE SIZE
BIG-ENDIAN
Write to FIFO1/
Read from FIFO2
Read from FIFO1/
Write to FIFO2
1st: Read from FIFO1/
Write to FIFO2
BE
BM
SIZE
H
L
H
L
H
X
L
X
BYTE ORDER ON PORT A:
BE
BM
SIZE
BE
BM
SIZE
BE
BM
SIZE
2nd: Read from FIFO1/
Write to FIFO2
3rd: Read from FIFO1/
Write to FIFO2
4th: Read from FIFO1/
Write to FIFO2
1st: Read from FIFO1/
Write to FIFO2
1st: Read from FIFO1/
Write to FIFO2
2nd: Read from FIFO1/
Write to FIFO2
2nd: Read from FIFO1/
Write to FIFO2
D
C
(e) BYTE SIZE
LITTLE-ENDIAN
1st: Read from FIFO1/
Write to FIFO2
A
B
BE
BM
SIZE
L
H
2nd: Read from FIFO1/
Write to FIFO2
3rd: Read from FIFO1/
Write to FIFO2
4th: Read from FIFO1/
Write to FIFO2
4664 drw04
BYTE ORDER ON PORT B:
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0
B35 B27
B26 B18
B17 B9
B8 B0