4 Mbit SPI Serial Flash
SST25VF040B
Data Sheet
CE#
MODE 3
0
1
2
3
4 5 6 7
MODE 0
SCK
80
SI
MSB
HIGH IMPEDANCE
SO
1295 DisableSO.0
FIGURE 9: Disable SO as Hardware RY/BY#
during AAI Programming
CE#
0
7
8
15 16 23 24 31 32 39 40 47
0
7
8
15 16 23
0
7
8
15 16 23
0
7
0
7
8
15
MODE 3
MODE 0
SCK
SI
D
D
WRDI
RDSR
AD
A
A
A
D0
D1
AD
D2
D3
AD
n-1
n
Last 2
Data Bytes
WDRI to exit
AAI Mode
Load AAI command, Address, 2 bytes data
D
OUT
SO
Wait T or poll
BP
Software Status register
to load any command
Check for Flash Busy Status to load next valid1 command
Note: 1. Valid commands during AAI programming: AAI command or WRDI command
2. User must configure the SO pin to output Flash Busy status during AAI programming
1295 AAI.HW.0
FIGURE 10: Auto Address Increment (AAI) Word-Program Sequence with
Hardware End-of-Write Detection
©2009 Silicon Storage Technology, Inc.
S71295-05-000
10/09
13
SST [ SILICON STORAGE TECHNOLOGY, INC ]
