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GD25B256D 데이터시트(PDF) 15 Page - GigaDevice Semiconductor (Beijing) Inc.

부품명 GD25B256D
상세설명  3.3V Uniform Sector Dual and Quad Serial Flash
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3.3V Uniform Sector
Dual and Quad Serial Flash
GD25B256D
15
6.2. Extended Address Register
Table 12 Extended Address Register
No.
Name
Description
Note
EA0
A24
Address bit
Volatile writable
EA1
Reserved
Reserved
Reserved
EA2
Reserved
Reserved
Reserved
EA3
Reserved
Reserved
Reserved
EA4
Reserved
Reserved
Reserved
EA5
Reserved
Reserved
Reserved
EA6
Reserved
Reserved
Reserved
EA7
Reserved
Reserved
Reserved
The extended address register is only used when the address mode is 3-Byte mode, as to set the higher address.
A24=1 indicates the upper 128Mb memory address, A24=0 indicates the lower 128Mb. EA1~EA7 are reserved.
A24 bit
The Extended Address Bit A24 is used only when the device is operating in the 3-Byte Address Mode (ADS=0), which
is volatile writable by C5H command. The lower 128Mb memory array (00000000h
– 00FFFFFFh) is selected when A24=0,
and all instructions with 3-Byte addresses will be executed within that region. When A24=1, the upper 128Mb memory array
(01000000h
– 01FFFFFFh) will be selected.
If the device powers up with ADP bit set to 1, or an “Enter 4-Byte Address Mode (B7H)” instruction is issued, the
device will require 4-Byte address input for all address related instructions, and the Extended Address Bit A24 setting will
be ignored. However, any instruction with 4-Byte address input will replace the Extended Address Bit A24 with new settings.
Reserved bit
It is recommended to set the value of the reserved bit
as “0”.


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