©2014 Silicon Storage Technology, Inc.

DS20005016C

11/14

24

512 Kbit / 1 Mbit / 2 Mbit / 4 Mbit 1.8V SPI Serial Flash

SST25WF512 / SST25WF010 / SST25WF020 / SST25WF040

EOL Data Sheet

JEDEC Read-ID

The JEDEC Read-ID instruction identifies the device as SST25WF512/010/020/040 and the manufac-

turer as SST. The device information can be read from executing the 8-bit command, 9FH. Following

the JEDEC Read-ID instruction, the 8-bit manufacturer’s ID, BFH, is output from the device. After that,

a 16-bit device ID is shifted out on the SO pin. The Device ID is assigned by the manufacturer and con-

tains the type of memory in the first byte and the memory capacity of the device in the second byte.

See Figure 23 for the instruction sequence. The JEDEC Read ID instruction is terminated by a low to

high transition on CE# at any time during data output.

Figure 23:JEDEC Read-ID Sequence

Table 12: JEDEC Read-ID Data-Out for SST25WF512

Device ID

Product

Manufacturer’s ID (Byte 1)

Memory Type (Byte 2)

Memory Capacity (Byte 3)

SST25WF512

BFH

25H

01H

SST25WF010

BFH

25H

02H

SST25WF020

BFH

25H

03H

SST25WF040

BFH

25H

04H

T12.0 20005016

25

Byte 3

1328 F23.0

CE#

SO

SI

SCK

012345678

HIGH IMPEDANCE

15 16

14

28 29 30 31

BF

MODE 3

MODE 0

MSB

MSB

9 10111213

1718

32

34

9F

19 20 21 22 23

33

24 25 26 27

Note: See Table 12 for Device ID Byte 3 value.