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512 Kbit / 1 Mbit / 2 Mbit / 4 Mbit 1.8V SPI Serial Flash
A Microchip Technology Company
SST25WF512 / SST25WF010 / SST25WF020 / SST25WF040
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#.
Table 11: Product Identification
Address
Data
Manufacturer’s ID
Device ID
SST25WF512
SST25WF010
SST25WF020
SST25WF040
000000H
000001H
000001H
000001H
000001H
BFH
01H
02H
03H
04H
T11.25016
CE#
MODE 3
0 1 2 3 4 5 6 7 8
15 16
23 24
31 32
39 40
47 48
55 56
63
SCK
MODE 0
SI
MSB
90 or AB
00
00
ADD
MSB
HIGH
SO
HIGH IMPEDANCE
BF
Device ID
BF
Device ID
IMPEDANCE
MSB
1328 F22.0
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.
Figure 22: Read-ID Sequence
?2011 Silicon Storage Technology, Inc.
23
DS25016A
06/11
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