FOR MOBILE APPLICATIONS
W25Q256FV
Publication Release Date: May 13, 2012
- 40 - Preliminary - Revision M1
Fast Read (0Bh) in QPI Mode
The Fast Read instruction is also supported in QPI mode. When QPI mode is enabled, the number of
dummy clocks is configured by the “Set Read Parameters (C0h)” instruction to accommodate a wide
range of applications with different needs for either maximum Fast Read frequency or minimum data
access latency. Depending on the Read Parameter Bits P[5:4] setting, the number of dummy clocks can
be configured as either 2, 4, 6 or 8. The default number of dummy clocks upon power up or after a Reset
instruction is 2.
/CS
CLK
Mode 0
Mode 3
0
1
IO
0
IO
1
IO
2
IO
3
0Bh
2
3
4
5
20
16
12
8
21
17
22
18
23
19
13
9
14
10
15
11
A23-16
6
7
8
9
4
0
5
1
6
2
7
3
A15-8
A7-0
Dummy
*
Byte 1
Byte 2
4
0
5
1
6
2
7
3
4
0
5
1
6
2
7
3
4
0
5
1
6
2
7
3
10
11
12
13
4
5
6
7
IOs switch from
Input to Output
*
"Set Read Parameters" instruction (C0h) can set
the number of dummy clocks.
Instruction
Figure 16b. Fast Read Instruction (QPI Mode)
32-Bit Address is required when the device is operating in 4-Byte Address Mode
