GD25LQ40xIGx 1.8V Uniform Sector Dual and Quad Serial Flash
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7.4. Read Status Register (RDSR) (05H or 35H)
The Read Status Register (RDSR) command is for reading the Status Register. The Status Register may be read
at any time, even while a Program, Erase or Write Status Register cycle is in progress. When one of these cycles
is in progress, it is recommended to check the Write In Progress (WIP) bit before sending a new command to
the device. It is also possible to read the Status Register continuously. For command code “05H”, the SO will
output Status Register bits S7~S0. The command code “35H”, the SO will output Status Register bits S15~S8.
Figure 5. Read Status Register Sequence Diagram
CS#
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
SCLK
SI
Command
05H or 35H
S7~S0 or S15~S8 out
S7~S0 or S15~S8 out
SO
High-Z
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
MSB
MSB
Figure 5a. Read Status Register Sequence Diagram (QPI)
CS#
0
1
2
3
4
5
SCLK
IO0
Command
05H or 35H
4
5
0
1
2
3
4
5
6
7
0
1
4
5
6
7
IO1
IO2
IO3
6
2
7
3
S7-S0 or S15-S8 out
Rev.1.0
59 - 18
ELM [ ELM ELECTRONICS ]
