EN29GL064 Datasheet, PDF (40/66 Pages) Eon Silicon Solution Inc. – 64 Megabit (8192K x 8-bit / 4096K x 16-bit) Flash Memory

Table 9. Secured Silicon Sector Addresses
Preliminary EN29GL064
Factory Locked Secured Silicon Sector
The Factory Locked Secured Silicon Sector is always protected when shipped from the factory and has
the Secured Silicon Sector Indicator Bit (DQ7) permanently set to a “1”. This prevents cloning of a
factory locked part and ensures the security of the ESN and customer code once the product is shipped
to the field.
These devices are available pre-programmed with one of the following:
• 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 EON programming service.
Customers may opt to have their code programmed through the EON programming services. EON
programs the customer's code, with or without the random ESN. The devices are then shipped from the
EON factory with the Secured Silicon Sector permanently locked. Contact your local representative for
details on using EON programming services.
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.
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.
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.
The Secured Silicon Sector Entry Command allows the following commands to be executed
• 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.
This Data Sheet may be revised by subsequent versions
40
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc.,
Rev. A, Issue Date: 2009/3/20
www.eonssi.com