MX25L12835F
8-1. Quad Peripheral Interface (QPI) Read Mode
QPI protocol enables user to take full advantage of Quad I/O Serial Flash by providing the Quad I/O interface in
command cycles, address cycles and as well as data output cycles.
Enable QPI mode
By issuing 35H command, the QPI mode is enable. After QPI mode enable, the device enter quad mode (4-4-4)
without QE bit status changed.
Figure 4. Enable QPI Sequence
CS#
MODE 3
MODE 0
2
3
4
5
6
7
0
1
SCLK
SIO0
35h
SIO[3:1]
Reset QPI (RSTQIO)
To reset the QPI mode, the RSTQIO (F5H) command is required. After the RSTQIO command is issued, the device
returns from QPI mode (4 I/O interface in command cycles) to SPI mode (1 I/O interface in command cycles).
Note:
For EQIO and RSTQIO commands, CS# high width has to follow "write spec" tSHSL for next instruction.
Figure 5. Reset QPI Mode
CS#
SCLK
SIO[3:0]
F5h
P/N: PM1795
REV. 1.0, OCT. 23, 2012
15
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