SST25VF040B View Datasheet(PDF) - Silicon Storage Technology

Part Name

Description

Manufacturer

SST25VF040B

4 Mbit SPI Serial Flash

Silicon Storage Technology 

Data Sheet

JEDEC Read-ID

The JEDEC Read-ID instruction identifies the device as

SST25VF040B and the manufacturer 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. Byte 1,

4 Mbit SPI Serial Flash

SST25VF040B

BFH, identifies the manufacturer as SST. Byte 2, 25H, iden-

tifies the memory type as SPI Serial Flash. Byte 3, 8DH,

identifies the device as SST25VF040B. The instruction

sequence is shown in Figure 20. The JEDEC Read ID

instruction is terminated by a low to high transition on CE#

at any time during data output.

CE#

SCK

MODE 3

MODE 0

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

SI

9F

HIGH IMPEDANCE

SO

BF

MSB

FIGURE 20: JEDEC Read-ID Sequence

25

MSB

TABLE 6: JEDEC Read-ID Data

Manufacturer’s ID

Device ID

Byte1

BFH

Memory Type

Byte 2

25H

Memory Capacity

Byte 3

8DH

T6.0 1295

8D

1295 JEDECID.1

©2009 Silicon Storage Technology, Inc.

20

S71295-05-000

10/09

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