SST25VF040B SST, SST25VF040B Datasheet - Page 20

• Manufacturer Part Number: SST25VF040B
• Description: 4 Mbit SPI Serial Flash
• Manufacturer: SST

Data Sheet
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: P
©2006 Silicon Storage Technology, Inc.
Manufacturer’s ID
Device ID
23
FIGURE 20: R
-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#.
RODUCT
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.
EAD
Device ID = 8DH for SST25VF040B
-ID S
MSB
0 1 2 3 4 5 6 7 8
I
DENTIFICATION
EQUENCE
90 or AB
HIGH IMPEDANCE
Address
00000H
00001H
00
15 16
Data
BFH
8DH
T7.0 1295
00
23 24
MSB
20
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
4 Mbit SPI Serial Flash
55 56
Device ID
63
SST25VF040B
IMPEDANCE
S71295-01-000
HIGH
1295 RdID.0
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