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GD25B257D Scheda tecnica(PDF) 58 Page - GigaDevice Semiconductor (Beijing) Inc.

Il numero della parte GD25B257D
Spiegazioni elettronici  3.3V Uniform Sector Dual and Quad Serial Flash
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Produttore elettronici  GIGADEVICE [GigaDevice Semiconductor (Beijing) Inc.]
Homepage  http://www.gigadevice.com/
Logo GIGADEVICE - GigaDevice Semiconductor (Beijing) Inc.

GD25B257D Scheda tecnica(HTML) 58 Page - GigaDevice Semiconductor (Beijing) Inc.

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3.3V Uniform Sector
Dual and Quad Serial Flash
GD25B257D
58
8.25.
Enter 4-Byte Address Mode (B7H)
The Enter 4-Byte Address Mode command enables accessing the address length of 32-bit for the memory area of
higher density (larger than 128Mb). The device default is in 24-bit address mode; after sending out the EN4B instruction,
the bit8 (ADS bit
) of status register will be automatically set to “1” to indicate the 4-Byte address mode has been enabled.
Once the 4-Byte address mode is enabled, the address length becomes 32-bit instead of the default 24-bit.
All instructions are accepted normally, and just the address bit is changed from 24-bit to 32-bit.
The sequence of issuing EN4B instruction is: CS# goes low  sending Enter 4-Byte mode command CS# goes
high.
Figure 61. Enter 4-Byte Address Mode Sequence Diagram
8.26.
Exit 4-Byte Address Mode (E9H)
The Exit 4-Byte Address Mode command is executed to exit the 4-Byte address mode and return to the default 3-Byte
address mode. After sending out the EX4B instruction, the bit8 (ADS bit) of status regis
ter will be cleared to “0” to indicate
the exit of the 4-Byte address mode. Once exiting the 4-Byte address mode, the address length will return to 24-bit.
The sequence of issuing EN4B instruction is: CS# goes low  sending Exit 4-Byte Address Mode command CS#
goes high.
Figure 62.Exit 4-Byte Address Mode Sequence Diagram
Command
0
1
2
3
4
5
6
7
B7H
CS#
SCLK
SI
SO
High-Z
Command
0
1
2
3
4
5
6
7
E9H
CS#
SCLK
SI
SO
High-Z


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