W78M32VP-XBX
These devices are available pre-programmed with one of the
following:
SECURED SILICON SECTOR ENTRY/EXIT
COMMAND SEQUENCES
The system can access the Secured Silicon Sector region by
issuing the three-cycle Enter Secured Silicon Sector command
sequence. The device continues to access the Secured Silicon
Sector region until the system issues the four-cycle Exit Secured
Silicon Sector command sequence.
A random, 8 Word secure ESN only within the Secured
Silicon Sector (at addresses 000000H - 000007H)
Both a random, secure ESN and customer code through the
Spansion programming service.
Customers may opt to have their code programmed through
the Spansion programming services. Spansion programs the
customer's code, with or without the random ESN. The devices are
then shipped from the Spansion factory with the Secured Silicon
Sector permanently locked. Contact your local representative for
details on using Spansion programming services.
See Command Definitions [Secured Silicon Sector Command
Table, Appendix
Table 39 for address and data requirements for both command
sequences.
The Secured Silicon Sector Entry Command allows the following
commands to be executed
CUSTOMER LOCKABLE SECURED SILICON
SECTOR
The Customer Lockable Secured Silicon Sector is always shipped
unprotected (DQ7 set to “0”), allowing customers to utilize that
sector in any manner they choose. If the security feature is not
required, the Secured Silicon Sector can be treated as an additional
Flash memory space.
Read customer and factory Secured Silicon areas
Program the customer Secured Silicon Sector
After the system has written the Enter Secured Silicon Sector
command sequence, it may read the Secured Silicon Sector by
using the addresses normally occupied by sector SA0 within the
memory array. This mode of operation continues until the system
issues the Exit Secured Silicon Sector command sequence, or
until power is removed from the device.
Please note the following:
Once the Secured Silicon Sector area is protected, the
Secured Silicon Sector Indicator Bit is permanently set to
“0.”
The Secured Silicon Sector can be read any number of
times, but can be programmed and locked only once. The
Secured Silicon Sector lock must be used with caution as
once locked, there is no procedure available for unlocking
the Secured Silicon Sector area and none of the bits in the
Secured Silicon Sector memory space can be modified in
any way.
The accelerated programming (ACC) and unlock bypass
functions are not available when the Secured Silicon Sector
is enabled.
Once the Secured Silicon Sector is locked and verified, the
system must write the Exit Secured Silicon Sector Region
command sequence which return the device to the memory
array at sector 0.
Microsemi Corporation reserves the right to change products or specifications without notice.
August 2011 © 2011 Microsemi Corporation. All rights reserved.
Rev. 15
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Microsemi Corporation • (602) 437-1520 • www.microsemi.com
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