GD25LQ64C Datasheet, PDF (18/62 Pages) ELM Electronics – 64M-bit Serial Flash

GD25LQ64CxIGx 1.8V Uniform Sector Dual and Quad Serial Flash
7.4. Read Status Register (RDSR) (05H or 35H or 15H)
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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”/“35H”, the
SO will output Status Register bits S7~S0/S15~S8. The command code “15H” only supports the QPI mode, the
I/O0 will output Status Register S1-S0. (For 133MHz Frequency, the 15H will better than 05H to check the WIP
bit.)
Figure 5. Read Status Register Sequence Diagram
CS#
SCLK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Command
SI
05H or 35H
SO
High-Z
S7~S0 or S15~S8 out
S7~S0 or S15~S8 out
76543210765432107
MSB
MSB
Figure 5a. Read Status Register Sequence Diagram (QPI)
CS#
SCLK
IO₀
012345
Command
05H or 35H
40 4 04
IO₁
51 515
IO₂
6262 6
IO₃
7 3 7 37
S7-S0 or S15-S8 out
Figure 5b. Read Status Register Sequence Diagram (QPI)(15H)
CS#
SCLK
IO₀
IO₁
012345
Command
15H
S1 S0 S1 S0
S1-S0 out
IO₂
IO₃
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Rev.1.0