SST25VF040B View Datasheet(PDF) - Silicon Storage Technology

Part Name

Description

Manufacturer

SST25VF040B

4 Mbit SPI Serial Flash

Silicon Storage Technology 

4 Mbit SPI Serial Flash

SST25VF040B

Read-ID (RDID)

The Read-ID instruction (RDID) identifies the devices as

SST25VF040B and manufacturer as SST. This command

is backward compatible to all SST25xFxxxA devices and

should be used as default device identification when multi-

ple versions of SPI Serial Flash devices are used in a

design. The device information can be read from executing

an 8-bit command, 90H or ABH, followed by address bits

[A23-A0]. Following the Read-ID instruction, the manufac-

Data Sheet

turer’s ID is located in address 00000H and the device ID is

located in address 00001H. Once the device is in Read-ID

mode, the manufacturer’s and device ID output data tog-

gles between address 00000H and 00001H until termi-

nated by a low to high transition on CE#.

Refer to Tables 6 and 7 for device identification data.

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

90 or AB

00

00

ADD1

MSB

MSB

HIGH

HIGH IMPEDANCE

SO

BF Device ID BF Device ID IMPEDANCE

MSB

Note: The manufacturer's and device ID output stream is continuous until terminated by a low to high transition on CE#.

Device ID = 8DH for SST25VF040B

1. 00H will output the manfacturer's ID first and 01H will output device ID first before toggling between the two.

1295 RdID.0

FIGURE 21: Read-ID Sequence

TABLE 7: Product Identification

Manufacturer’s ID

Device ID

SST25VF040B

Address

00000H

00001H

Data

BFH

8DH

T7.0 1295

©2009 Silicon Storage Technology, Inc.

21

S71295-05-000

10/09

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