W25Q80DVSNIG-TR Datasheet, PDF (30/71 Pages) Winbond – 3V 8M-BIT SERIAL FLASH MEMORY WITH DUAL AND QUAD SPI

W25Q80DV
Fast Read Dual I/O (BBh)
The Fast Read Dual I/O (BBh) instruction allows for improved random access while maintaining two IO
pins, IO0 and IO1. It is similar to the Fast Read Dual Output (3Bh) instruction but with the capability to
input the Address bits (A23-0) two bits per clock. This reduced instruction overhead may allow for code
execution (XIP) directly from the Dual SPI in some applications.
/CS
CLK
Mode 3
Mode 0
DI
(IO₀)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Instruction (BBh)
A23-16
A15-8
A7-0
M7-0
22 20 18 16 14 12 10 8 6 4 2 0 6 4 2 0
DO
(IO₁)
/CS
CLK
DI
(IO₀)
* ^{= MSB}
23 21 19 17 15 13 11 9 7 5 3 1 7 5 3 1
*
*
23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
IOs switch from
Input to Output
064206420642064206
DO
(IO₁)
175317531753175317
* Byte 1
* Byte 2
* Byte 3
* Byte 4
Figure 13a. Fast Read Dual I/O Instruction Sequence (M[7:0] =FFh)
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Publication Release Date:July 21, 2015
Prelimry-Revision G