W25Q128FVSIF-TR Datasheet, PDF (45/100 Pages) Winbond – 3V 128M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q128FV
Fast Read Quad I/O (EBh) in QPI Mode
The Fast Read Quad I/O instruction is also supported in QPI mode, as shown in Figure 19c. 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. In QPI mode, the “Continuous Read
Mode” bits M7-0 are also considered as dummy clocks. In the default setting, the data output will follow
the Continuous Read Mode bits immediately.
“Continuous Read Mode” feature is also available in QPI mode for Fast Read Quad I/O instruction.
Please refer to the description on previous pages.
“Wrap Around” feature is not available in QPI mode for Fast Read Quad I/O instruction. To perform a read
operation with fixed data length wrap around in QPI mode, a dedicated “Burst Read with Wrap” (0Ch)
instruction must be used. Please refer to 8.2.45 for details.
/CS
CLK
IO₀
Mode 3
Mode 0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Instruction
EBh
A23-16
A15-8
A7-0
M7-0*
IOs switch from
Input to Output
20 16 12 8 4 0 4 0 4 0 4 0 4
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 Byte 3
* "Set Read Parameters" instruction (C0h) can
set the number of dummy clocks.
Figure 24c. Fast Read Quad I/O Instruction (Initial instruction or previous M5-410, QPI Mode)
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Publication Release Date: October 09, 2013
Revision I