SST25VF040B-50-4I-SAE SST [Silicon Storage Technology, Inc], SST25VF040B-50-4I-SAE Datasheet - Page 21

• Manufacturer Part Number: SST25VF040B-50-4I-SAE
• Description: 4 Mbit SPI Serial Flash
• Manufacturer: SST [Silicon Storage Technology, Inc]

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
[A
TABLE 7: Product Identification
©2009 Silicon Storage Technology, Inc.
Manufacturer’s ID
Device ID
23
FIGURE 21: Read-ID Sequence
-A
SST25VF040B
0
]. Following the Read-ID instruction, the manufac-
SCK
CE#
SO
SI
Note: The manufacturer's and device ID output stream is continuous until terminated by a low to high transition on CE#.
MODE 3
MODE 0
1. 00H will output the manfacturer's ID first and 01H will output device ID first before toggling between the two.
Device ID = 8DH for SST25VF040B
MSB
0 1 2 3 4 5 6 7 8
90 or AB
HIGH IMPEDANCE
Address
00000H
00001H
00
15 16
Data
BFH
8DH
T7.0 1295
00
23 24
MSB
21
ADD
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.
31 32
1
MSB
BF
39 40
Device ID
47 48
BF
55 56
Device ID
63
IMPEDANCE
S71295-05-000
HIGH
1295 RdID.0
Data Sheet
10/09