SST25VF040B-50-4I-SAE SST [Silicon Storage Technology, Inc], SST25VF040B-50-4I-SAE Datasheet - Page 20

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

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,
TABLE 6: JEDEC Read-ID Data
©2009 Silicon Storage Technology, Inc.
Manufacturer’s ID
FIGURE 20: JEDEC Read-ID Sequence
Byte1
BFH
SCK
CE#
SO
SI
HIGH IMPEDANCE
MODE 3
MODE 0
Memory Type
0 1 2 3 4 5 6 7 8
Byte 2
25H
9F
Device ID
Memory Capacity
MSB
Byte 3
8DH
9 10 11 12 13
T6.0 1295
BF
14
20
15 16
MSB
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.
17 18
19 20 21 22 23
25
24 25 26 27
4 Mbit SPI Serial Flash
8D
1295 JEDECID.1
28 29 30 31
SST25VF040B
32
S71295-05-000
33
34
10/09