GD25B256DFIS datasheet(15/82 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25B256D

6.2. Extended Address Register

Table 12 Extended Address Register

No.

Name

Description

Note

EA0

A24

Address bit

Volatile writable

EA1

Reserved

EA2

Reserved

EA3

Reserved

EA4

Reserved

EA5

Reserved

EA6

Reserved

EA7

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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