
28
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72T1845/55/65/75/85/95/105/115/125 2.5V TeraSync 18-BIT/9-BIT FIFO 2Kx18/4Kx9, 4Kx18/
8Kx9, 8Kx18/16Kx9, 16Kx18/32Kx9, 32Kx18/64Kx9, 64Kx18/128Kx9, 128Kx18/256Kx9, 256Kx18/512Kx9, 512Kx18/1Mx9
FEBRUARY 10, 2009
D17-D9
A
B
(a) x18 INPUT to x18 OUTPUT - BIG ENDIAN
(b) x18 INPUT to x18 OUTPUT - LITTLE ENDIAN
Write to FIFO
Read from FIFO
BYTE ORDER ON INPUT PORT:
BYTE ORDER ON OUTPUT PORT:
BA
Read from FIFO
A
(c) x18 INPUT to x9 OUTPUT - BIG ENDIAN
1st: Read from FIFO
B
2nd: Read from FIFO
B
(d) x18 INPUT to x9 OUTPUT - LITTLE ENDIAN
1st: Read from FIFO
A
2nd: Read from FIFO
A
(a) x9 INPUT to x18 OUTPUT - BIG ENDIAN
1st: Write to FIFO
BYTE ORDER ON INPUT PORT:
B
2nd: Write to FIFO
BYTE ORDER ON OUTPUT PORT:
AB
Read from FIFO
(a) x9 INPUT to x18 OUTPUT - LITTLE ENDIAN
B
A
Read from FIFO
5909 drw09
BE
IW
OW
H
L
H
BE
IW
OW
L
H
L
BE
IW
OW
H
L
BE
IW
OW
L
H
BE
IW
OW
H
L
BE
IW
OW
L
D8-D0
Q17-Q9
Q8-Q0
Q17-Q9
Q8-Q0
Q17-Q9
Q8-Q0
Q17-Q9
Q8-Q0
Q17-Q9
Q8-Q0
Q17-Q9
Q8-Q0
D17-D9
D8-D0
D17-Q9
D8-Q0
Q17-Q9
Q8-Q0
Q17-Q9
Q8-Q0
Figure 5. Bus-Matching Byte Arrangement