2 Mbit SPI Serial Flash
A Microchip Technology Company
SST25VF020B
Data Sheet
Read-ID (RDID)
The Read-ID instruction (RDID) identifies the devices as SST25VF020B and manufacturer as SST. The
device information can be read from executing an 8-bit command, 90H or ABH, followed by address
bits [A 23 -A 0 ]. Following the Read-ID instruction, the manufacturer’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 manufac-
turer’s and device ID output data toggles between address 00000H and 00001H until terminated by a
low to high transition on CE#.
Refer to Tables 7 and 8 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
MSB
90 or AB
00
00
ADD 1
MSB
HIGH
SO
HIGH IMPEDANCE
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 = 8CH for SST25VF020B
1. 00H will output the manfacturer's ID first and 01H will output device ID first before toggling between the two.
1417 RdID.0
Figure 23: Read-ID Sequence
Table 8: Product Identification
Address
Data
Manufacturer’s ID
Device ID
SST25VF020B
00000H
00001H
BFH
8CH
T8.0 25054
?2012 Silicon Storage Technology, Inc.
24
DS25054A
01/12
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