17
COMMERCIALTEMPERATURERANGE
IDT72V3654/72V3664/72V3674 3.3V CMOS SyncBiFIFOTM WITH BUS-MATCHING
2,048 x 36 x 2, 4,096 x 36 x 2 and 8,192 x 36 x 2
Figure 2. Bus Sizing
A35
A27
A26
A18
A17
A9
A8
A0
B35
B27
B26
B18
B17
9
B8
B0
A
D
A
C
B
C
B
D
C
A
D
B
B35
B27
B26
B18
B17
B9
B8
B0
(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:
B35
B27
B26
B18
B17
B9
B8
B0
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
B35
B27
B26
B18
B17
B9
B8
B0
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
B35
B27
B26
B18
B17
B9
B8
B0
4664 drw 04
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