©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

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

01 2 3 4 5 6 7 8

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.