Datasheet
©2011 Silicon Storage Technology, Inc. DS25041A 05/11
12
8 Mbit (x16) Multi-Purpose Flash Plus
SST39VF801C / SST39VF802C / SST39LF801C / SST39LF802C
Data Sheet
A
Microchip Technology Company
Security ID
The SST39VF801C/802C and SST39LF801C/802C devices offer a 136 Word Security ID space. The
Secure ID space is divided into two segments—one factory programmed segment and one user pro-
grammed segment. The first segment is programmed and locked at SST with a random 128-bit num-
ber. The user segment, with a 128 word space, is left un-programmed for the customer to program as
desired.
To program the user segment of the Security ID, the user must use the Security ID Word-Program
command. To detect end-of-write for the SEC ID, read the toggle bits. Do not use Data# Polling. Once
this is complete, the Sec ID should be locked using the User Sec ID Program Lock-Out. This disables
any future corruption of this space. Note that regardless of whether or not the Sec ID is locked, neither
Sec ID segment can be erased.
The Secure ID space can be queried by executing a three-byte command sequence with Enter Sec ID
command (88H) at address 555H in the last byte sequence. To exit this mode, the Exit Sec ID com-
mand should be executed. Refer to Table 7 for more details.