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16 Mbit LPC Serial Flash
A Microchip Technology Company
SST49LF016C
Data Sheet
Security ID Registers
The SST49LF016C device offers a 256-bit Security ID register space. The Security ID space is divided
into two segments - one (64-bits) factory programmed segment and one (192 bits) user programmed
segment. The first segment is programmed and locked at SST with a unique 64-bit number. The user
segment (192 bits) is left blank (FFH) for the customer to be programmed as desired. Refer to Table 8,
“Software Command Sequence” for more details.
The Security ID Information and its Write Lock/Unlock status can be Read in the Register Access
Space for Execute-In-Place type of applications. (See Table 16.)
The Write Lock-out status of the Security ID space can be read from the SEC_ID_WRITE_LOCK reg-
ister (see Table 16). The SEC_ID_WRITE_LOCK register is a read-only register that is accessible at
the address location specified in Table 16.
In case of multi-byte register reads with Firmware Memory cycle, for SEC_ID_WRITE_LOCK register,
the device will return register data for the addressed register until the command finishes, or is aborted.
In the case of multi-byte register reads with Firmware Memory cycle, for all the SEC_ID_BYTE regis-
ters, the device will return page-aligned sequential register data with wrap-around until the command
finishes, or is aborted.
Table 16: Security ID Registers
Register
Register
SEC_ID__WRITE_LOCK
Address 1
FFBC0102H
Value
0000 0000b
Access
R
Description
Write Unlocked
0000 0001b
Write Locked
SEC_ID_BYTE_0
SEC_ID_BYTE_1
SEC_ID_BYTE_2
SEC_ID_BYTE_3
…
SEC_ID_BYTE_7
SEC_ID_BYTE_8
SEC_ID_BYTE_9
…
SEC_ID_BYTE_30
SEC_ID_BYTE_31
FFBC0180H
FFBC0181H
FFBC0182H
FFBC0183H
…
FFBC0187H
FFBC0188H
FFBC0189H
…
FFBC019EH
FFBC019FH
R
R
R
R
…
R
R
R
…
R
R
Factory Programmed
Factory Programmed
Factory Programmed
Factory Programmed
…
Factory Programmed
User Programmed
User Programmed
…
User Programmed
User Programmed
T16.0 25029
1. Address shown in this column is for boot device only. Address locations should appear elsewhere in the 4 GByte sys-
tem memory map depending on ID strapping values on ID[3:0] pins when multiple LPC memory devices are used in a
system.
?2011 Silicon Storage Technology, Inc.
25
DS25029A
06/11
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