FOR MOBILE APPLICATIONS
W25Q256FV
Publication Release Date: May 13, 2012
- 36 - Preliminary - Revision M1
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.
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 0
Mode 3
0
1
Mode 0
Mode 3
IO
0
IO
1
IO
2
IO
3
E9h
Instruction
Figure 13. Exit 4-Byte Address Mode instruction for SPI Mode (left) or QPI Mode (right)