AL4V18x AverLogic Technologies, Inc., AL4V18x Datasheet - Page 10

• Manufacturer Part Number: AL4V18x
• Description: 1K X 18 And 4K X 18 Line Buffers
• Manufacturer: AverLogic Technologies, Inc.

Table 1: Bus-Matching and Endian Support Configuration
Notes: In x9 in to x9 output configuration, Big-Endian/Little-Endian (/BEB) does not affect byte
sequence.
9.0 Multiple Devices Bus Expansion
9.1 Width Expansion Configuration
Simply connecting the corresponding input controls signals of multiple devices may increase data bus
width. Figure 3 shows an 36-bit word width data bus by using two AL4V183 or AL4V185s. Adding
additional AL4V183 or AL4V185s can attain any word width expansion.
AL4V183/AL4V185
IW
H
H
L
L
L
L
OW
H
H
L
L
L
L
/BEB
H
H
H
L
L
L
D17 ~ D9
A
A
A
A
X
X
Input Bus
D8 ~ D0
B (2
B (2
A (1
A (1
B
B
B
B
ND
ND
ST
ST
)
)
)
)
Q17 ~ Q9
X
X
A
B
A
B
Output
Q8 ~ Q0
B (2
A (2
A (1
B (1
B
A
B
A
ND
ND
ST
ST
)
)
)
)
x18 Input to x18 Output – Little Endian
x18 Input to x9 Output – Little Endian
x9 Input to x18 Output – Little Endian
x18 Input to x18 Output – Big Endian
x18 Input to x9 Output – Big Endian
x9 Input to x18 Output – Big Endian
Configuration
February 20, 2003
AL4V183/AL4V185
10