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ATSHA204A Datasheet(PDF) 16 Page - Microchip Technology |
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ATSHA204A Datasheet(HTML) 16 Page - Microchip Technology |
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16 / 93 page  Word (HEX) Address (HEX) Default 0x03 0x0C 0xFFFFFFFF 0x04 0x10 0xFFFFFFFF 0x05 0x14 0xFFFFFFFF 0x06 0x18 0xFFFFFFFF 0x07 0x1C 0xFFFFFFFF 0x08 0x20 0xFFFFFFFF 0x09 0x24 0xFFFFFFFF 0x0A 0x28 0xFFFFFFFF 0x0B 0x2C 0xFFFFFFFF 0x0C 0x30 0xFFFFFFFF 0x0D 0x34 0xFFFFFFFF 0x0E 0x38 0xFFFFFFFF 0x0F 0x3C 0xFFFFFFFF 2.1.4 Device Locking There are two separate lock bytes for the device: • One to lock the configuration zone (that is controlled by LockConfig, byte 87). • One to lock both the Data and OTP zones (that are controlled by LockValue, byte 86). This enables the access polices for each Data zone slot based on the Slot configuration. These locks are stored within separate bytes in the Configuration zone and can be modified only through the Lock command. After a memory zone is locked, there is no way to unlock it. Locking of the Data/OTP zone does not mean the slots can not be modified. The slots can be modified based on the access policies defined by the Slot configuration. The device should be personalized at the system manufacturer with the desired configuration information and the Configuration zone should be locked. When this lock is complete, all necessary writes of public and secret information into the EEPROM slots should be performed using encrypted writes if appropriate. Upon completion of writes to the data and OTP zones, the Data and OTP zones the LockValue byte should be written. It is vital that the LockValue byte be set to lock prior to release of the system containing the device into the field in order to protect the data stored in the Data and OTP zones. Failure to lock these zones may permit modification of any secret keys and may lead to other security problems. Any attempt to read or write the Data or OTP sections prior to locking the configuration section causes the device to return an error. Contact Microchip for optional secure personalization services. 2.1.4.1 Configuration Zone Locking Certain bytes within the configuration zone cannot be modified, regardless of the state of LockConfig. Access to the remainder of the bytes within the zone is controlled using the LockConfig byte in the configuration zone, as shown in the table below. Throughout this document, if LockConfig is 0x55, then the configuration zone is said to be unlocked; otherwise it is locked. ATSHA204A Device Organization © 2018 Microchip Technology Inc. DS40002025A-page 16 |
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