W25Q256FVBIF-TR Datasheet, PDF (43/108 Pages) Winbond – 3V 256M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q256FV
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
IO₀
Mode 3
Mode 0
0 1 2 3 4 5 6 7 8 9 10 11 12 13
Instruction
0Bh
A23-16
20 16
A15-8
12 8
A7-0 Dummy*
40404
IOs switch from
Input to Output
0404
IO₁
21 17 13 9 5 1 5 1 5 1 5 1 5
IO₂
22 18 14 10 6 2 6 2 6 2 6 2 6
IO₃
23 19 15 11 7 3 7 3 7 3 7 3 7
Byte 1 Byte 2
* "Set Read Parameters" instruction (C0h) can set
the number of dummy clocks.
Figure 16b. Fast Read Instruction (QPI Mode)
32-Bit Address is required when the device is operating in 4-Byte Address Mode
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Publication Release Date: February 11, 2015
Preliminary – Revision H