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64 Mbit SPI Serial Dual I/O Flash
A Microchip Technology Company
SST25VF064C
Data Sheet
Security ID
SST25VF064C offers a 256-bit Security ID (Sec ID) feature. The Security ID space is divided into two
parts – one factory-programmed, 64-bit segment and one user-programmable 192-bit segment. The
factory-programmed segment is programmed at SST with a unique number and cannot be changed.
The user-programmable segment is left unprogrammed for the customer to program as desired.
Use the Program SID command to program the Security ID using the address shown in Table 7. Once
programmed, the Security ID can be locked using the Lockout SID command. This prevents any future
write to the Security ID.
The factory-programmed portion of the Security ID can never be programmed, and none of the Secu-
rity ID can be erased.
Status Register
The software status register provides status on whether the flash memory array is available for any
Read or Write operation, whether the device is Write enabled, and the state of the Memory Write pro-
tection. During an internal Erase or Program operation, the status register may be read only to deter-
mine the completion of an operation in progress. Table 4 describes the function of each bit in the
software status register.
Table 4: Status Register
Default at
Bit
0
Name
BUSY
Function
1 = Internal Write operation is in progress
Power-up
0
Read/Write
R
0 = No internal Write operation is in progress
1
WEL
1 = Device is memory Write enabled
0
R
0 = Device is not memory Write enabled
2
3
4
5
6
BP0
BP1
BP2
BP3
SEC 1
Indicate current level of block write protection (See Table 5)
Indicate current level of block write protection (See Table 5)
Indicate current level of block write protection (See Table 5)
Indicate current level of block write protection (See Table 5)
Security ID status
1
1
1
1
0 1
R/W
R/W
R/W
R/W
R
1 = Security ID space locked
0 = Security ID space not locked
7
BPL
1 = BP3, BP2, BP1, BP0 are read-only bits
0
R/W
0 = BP3, BP2, BP1, BP0 are readable/writable
T4.0 25036
1. The Security ID status will always be ‘1’ at power-up after a successful execution of the Lockout SID instruction; other-
wise, the default at power up is ‘0’.
?2011 Silicon Storage Technology, Inc.
8
DS25036A
06/11
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