AT88SC0104CA_11 ATMEL [ATMEL Corporation], AT88SC0104CA_11 Datasheet - Page 8

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AT88SC0104CA_11

Manufacturer Part Number
AT88SC0104CA_11
Description
Atmel CryptoMemory Specification Datasheet
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
5.
5.1
5.2
5.3
Configuration and User Zone Description
Detailed Description
To enable the security features of CryptoMemory, personalize the device by setting up registers and loading appropriate
passwords and keys. This is accomplished though programming the configuration zone of CryptoMemory using simple write
and read commands. To gain access to the configuration zone, the secure code (Write 7 password) must be successfully
presented. After writing and verifying data in the configuration zone, the security fuses must be blown to lock this information in
the device. For additional information on personalizing CryptoMemory,
specification.
Control Logic
Access to the user zones occurs only through the control logic built into the device. This logic is configurable through access
registers, key registers and keys programmed into the configuration memory during device personalization. Also implemented
in the control logic is a cryptographic engine for performing the various higher-level security functions of the device.
Configuration Memory
The configuration memory consists of 2048 bits of EEPROM memory used for storing passwords, keys, codes, and defining
security levels to be used for each user zone. The control logic defines access rights to the configuration memory and the user
may not alter these rights. The access rights include the ability to program certain portions of the configuration memory and
then lock the data written through use of security fuses. The configuration memory for each CryptoMemory device is identical
with the exception of the number of access registers and password/key registers available. Devices with four user zones have
four sets of registers, and those with eight user zones, eight sets of registers. Unused memory space in the register region
becomes reserved to ensure other components of the configuration memory remain at the same address location regardless
of the number of user zones in a device.
Atmel AT88SC0104CA/0204CA/0404CA/0808CA [Datasheet]
please see the examples in the protocol sections of this
8664E−CRYPTO−12/11
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