GD25LQ40xIGx 1.8V Uniform Sector Dual and Quad Serial Flash
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7.1. Write Enable (WREN)(06H)
The Write Enable (WREN) command is for setting the Write Enable Latch (WEL) bit. The Write Enable Latch
(WEL) bit must be set prior to every Page Program (PP), Sector Erase (SE), Block Erase (BE), Chip Erase (CE),
Write Status Register (WRSR) and Erase/Program Security Registers command. The Write Enable (WREN)
command sequence: CS# goes low → sending the Write Enable command → CS# goes high.
Figure 2. Write Enable Sequence Diagram
CS#
0
1
2
3
4
5
6
7
SCLK
SI
Command
06H
High-Z
SO
Figure 2a. Write Enable Sequence Diagram (QPI)
CS#
0
1
SCLK
Command
06H
IO0
IO1
IO2
IO3
Rev.1.0
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