W25Q256FVBIF-TR Datasheet, PDF (39/108 Pages) Winbond – 3V 256M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q256FV
8.2.8 Enter 4-Byte Address Mode (B7h)
The Enter 4-Byte Address Mode instruction (Figure 12) will allow 32-bit address (A31-A0) to be used to
access the memory array beyond 128Mb. The Enter 4-Byte Address Mode instruction is entered by
driving /CS low, shifting the instruction code “B7h” into the DI pin and then driving /CS high.
/CS
CLK
Mode 3
Mode 0
DI
(IO₀)
DO
(IO₁)
01234567
Mode 3
Mode 0
Instruction (B7h)
High Impedance
/CS
CLK
IO0
Mode 3
Mode 0
01
Instruction
B7h
Mode 3
Mode 0
IO1
IO2
IO3
Figure 12. Enter 4-Byte Address Mode instruction for SPI Mode (left) or QPI Mode (right)
8.2.9 Exit 4-Byte Address Mode (E9h)
In order to be backward compatible, the Exit 4-Byte Address Mode instruction (Figure 13) will only allow
24-bit address (A23-A0) to be used to access the memory array up to 128Mb. The Extended Address
Register must be used to access the memory array beyond 128Mb. The Exit 4-Byte Address Mode
instruction is entered by driving /CS low, shifting the instruction code “E9h” into the DI pin and then driving
/CS high.
/CS
CLK
Mode 3
Mode 0
DI
(IO₀)
DO
(IO₁)
01234567
Instruction (E9h)
Mode 3
Mode 0
High Impedance
/CS
CLK
IO0
Mode 3
Mode 0
01
Instruction
E9h
Mode 3
Mode 0
IO1
IO2
IO3
Figure 13. Exit 4-Byte Address Mode instruction for SPI Mode (left) or QPI Mode (right)
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Publication Release Date: February 11, 2015
Preliminary – Revision H