Pin No.
Pin Name
I/O
Description
-61-
IC DESCRIPTION -8/9 (HY29F400BT90) -2/2
45
46
47
48
DQ15/A -1
VSS
_____
BYTE
A16
I/O
–
I
I
Data Bus, active "H". In word mode, these pins provide a 16-bit data path for read and write
operations. In Byte mode, DQ [7:0] provide an 8-bit data path and DQ [15]/A [-1] is used as the
LSB of the 19-bit byte address input.
Power and signal ground.
Byte mode, active Low. Controls the byte/word configuration of the device. Low selects byte
mode, High selects word mode.
Address, active "H". In word mode, these 18 inputs select one of 262, 144 (256K) words within
the array for read or write operations. In Byte mode, these inputs are combined with the DQ15/
A-1 input (LSB) to select one of 524,288 (512K) bytes within the array for read or write
operations.
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9
2
8
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4
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9
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9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
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