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#
48
16
24
16
24
8
8
16
0
8
0
8
16
32
40
0
8
0
8
0
0
24
SCK
SI
D
n-1
D
n
A
WRDI
RDSR
W
AD
A
A
D0
AD
D2
D3
AD
D1
REN
Last 2
Data Bytes
WRDI to exit
AAI Mode
Load AAI command, Address, 2 bytes data
D
OUT
SO
Check for Flash Busy Status to load next valid command
Output Status
Register Data
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
©2007 Silicon Storage Technology, Inc.
S71295-02-000
7/07
13
SST [ SILICON STORAGE TECHNOLOGY, INC ]
