Datasheet

16 Mbit LPC Serial Flash

SST49LF016C

Data Sheet

Microchip Technology Company

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

Address

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.

Value Access Description

SEC_ID__WRITE_LOCK FFBC0102H 0000 0000b

0000 0001b

R Write Unlocked

Write Locked

SEC_ID_BYTE_0 FFBC0180H R Factory Programmed

SEC_ID_BYTE_1 FFBC0181H R Factory Programmed

SEC_ID_BYTE_2 FFBC0182H R Factory Programmed

SEC_ID_BYTE_3 FFBC0183H R Factory Programmed

… … … …

SEC_ID_BYTE_7 FFBC0187H R Factory Programmed

SEC_ID_BYTE_8 FFBC0188H R User Programmed

SEC_ID_BYTE_9 FFBC0189H R User Programmed

… … … …

SEC_ID_BYTE_30 FFBC019EH R User Programmed

SEC_ID_BYTE_31 FFBC019FH R User Programmed

T16.0 25029