Serial Quad I/O (SQI) Flash Memory
A Microchip Technology Company
SST26VF016 / SST26VF032
Data Sheet
Write-Protection Lock-Down
To prevent changes, the Block-Protection register can be set to Write-Protection Lock-Down using the
Lock Down Block Protection Register (LPBR) command. Once the Write-Protection Lock-Down is
enabled, the Block-Protection register can not be changed. To avoid inadvertent lock down, the WREN
command must be executed prior to the LBPR command.
To reset Write-Protection Lock-Down, power cycle the device. The Write-Protection Lock-Down status
may be read from the Status register.
Security ID
SST26VF016/032 offer 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 SecID Program command to program the Security ID using the address shown in Table 7.
Once programmed, the Security ID can be locked using the Lockout Sec ID command. This prevents
any future write to the Security ID.
The factory-programmed portion of the Security ID can’t be programmed by the user; neither factory-
programmed nor user-programmable areas can be erased.
©2011 Silicon Storage Technology, Inc.
DS-25017A
04/11
8
SST [ SILICON STORAGE TECHNOLOGY, INC ]
