GD25LQ256C Datasheet, PDF (16/68 Pages) ELM Electronics – 256M-bit Serial Flash

GD25LQ256CWIGx 1.8V Uniform Sector Dual and Quad Serial Flash
7.1. Enable 4-byte Mode (B7H)
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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 GD25LQ256C default is in 24-bit address node. 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.
Figure 2. Enable 4-byte Mode Sequence Diagram
CS#
SCLK
01234567
Command
SI
B7H
Figure 2a. Enable 4-byte Mode Sequence Diagram (QPI)
CS#
SCLK
IO₀
01
Command
B7H
IO₁
IO₂
IO₃
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Rev.1.0