©2014 Silicon Storage Technology, Inc. DS20005016C 11/14
23
512 Kbit / 1 Mbit / 2 Mbit / 4 Mbit 1.8V SPI Serial Flash
SST25WF512 / SST25WF010 / SST25WF020 / SST25WF040
EOL Data Sheet
Read-ID
The Read-ID instruction identifies the manufacturer as SST and the device as SST25WF512/010/020/
040. Use the Read-ID instruction to identify SST device when using multiple manufacturers in the
same socket. See Table 11.
The device information is read by executing an 8-bit command, 90H or ABH, followed by address bits
[A
23
-A
0
]. Following the Read-ID instruction, the manufacturer’s ID is located in address 000000H and
the device ID is located in address 000001H. Once the device is in Read-ID mode, the manufacturer’s
and device ID output data toggles between address 000000H and 000001H until terminated by a low
to high transition on CE#.
Figure 22:Read-ID Sequence
Table 11: Product Identification
Address Data
Manufacturer’s ID 000000H BFH
Device ID
SST25WF512 000001H 01H
SST25WF010 000001H 02H
SST25WF020 000001H 03H
SST25WF040 000001H 04H
T11.20005016
1328 F22.0
CE#
SO
SI
SCK
00
012345678
00 ADD
90 or AB
HIGH IMPEDANCE
15 16
23
24
31
32
39
40
47 48 55 56 63
BF
Device ID
BF
Device ID
HIGH
IMPEDANCE
MODE 3
MODE 0
MSB MSB
MSB
Note: The manufacturer’s and device ID output stream is continuous until terminated by a low-to-high transition on CE#.
00H will output the manufacturer’s ID first and 01H will out device ID first before toggling between the two.
