2 Mbit / 4 Mbit SPI Serial Flash
SST25LF020A / SST25LF040A
Data Sheet
Read-ID
The Read-ID instruction identifies the devices as
SST25LF020A/040A and manufacturer as SST. The
device information can be read from executing an 8-bit
command, 90H or ABH, followed by address bits [A23-A0].
Following the Read-ID instruction, the manufacturer’s ID is
located in address 00000H and the device ID is located in
address 00001H. Once the device is in Read-ID mode, the
manufacturer’s and device ID output data toggles between
address 00000H and 00001H until terminated by a low to
high transition on CE#.
CE#
MODE 3
MODE 0
0
1
2
3
4
5
6
7
8
15 16
23
31
39
40
47 48
55 56
63
24
32
SCK
90 or AB
00
00
ADD1
MSB
SI
MSB
HIGH
IMPEDANCE
HIGH IMPEDANCE
Device ID
Device ID
BF
BF
SO
MSB
Note: The manufacturer's and device ID output stream is continuous until terminated by a low to high transition on CE#.
1. 00H will output the manfacturer's ID first and 01H will output device ID first before toggling between the two.
1242 F15.0
FIGURE 15: READ-ID SEQUENCE
©2006 Silicon Storage Technology, Inc.
S71242-05-000
1/06
17
SST [ SILICON STORAGE TECHNOLOGY, INC ]
