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Giải thích chi tiết về linh kiện  1.8V Uniform Sector Dual and Quad Serial Flash
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1.8V Uniform Sector
Dual and Quad Serial Flash
GD25LB256D
18
7.1.
Enable 4-byte Mode (B7H)
The Enable 4-byte Mode command enables accessing the address length of 32-bit for the memory area of the higher
density (larger than 128Mb). The GD25LB256D default is in 24-bit address mode. After sending the Enable 4-byte Mode
command, the EN4B bit (S11) will be 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. The Disable 4-byte mode or
Reset or Power-off will disable 4-byte mode. In the 4-byte mode, A31-A25 are don
’t care.
Figure1. Enable 4-byte Mode Sequence Diagram
Command
0
1
2
3
4
5
6
7
B7H
CS#
SCLK
SI
Figure1a. Enable 4-byte Mode Sequence Diagram (QPI)
CS#
SCLK
IO0
IO1
IO2
IO3
0
1
Command
B7H



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