at88sc018 ATMEL Corporation, at88sc018 Datasheet - Page 24

• Manufacturer Part Number: at88sc018
• Description: Cryptocompanion? Chip For Cryptomemory And Cryptorf
• Manufacturer: ATMEL Corporation

3.17.
3.18.
3.19. Clear
3.20.
24
ReadManufacturingID
Reads the contents of the ManufacturingID and Lock Byte from the EEPROM. This command can always be executed,
regardless of whether or not the AT88SC018 has been locked.
Table 47.
Table 48.
Lock
Locks the current memory values into the AT88SC018, per the description in
AT88SC018 cannot be unlocked. After the execution of this command, the Lock Byte will have a value of 0xFF. This
command has no effect on locked parts.
There are no inputs or outputs to this command.
Clears the current authentication state, empties the C & S registers and prepares the chip for a new authentication. A
new startup challenge/response is NOT required. There are no input or output arguments to this command.
After execution of this command, the Auth_1 / Auth_2 sequence must be successfully completed before subsequent
execution of EncryptPassword, Encryption_1&2 and/or GrindBytes.
Crunch
Passes a random number of 8 bytes through the crunch engine on the AT88SC018 and sends the output of the crunch
engine back to the system. This command is used to ensure the AT88SC018 is talking with an actual CRF chip, which
should respond with the same answer in the given timeframe.
The AT88SC018 does not interpret these bytes, merely passes them through the crunch engine.
Table 49.
Table 50.
CryptoCompanion Chip
MfrID
Iterations
Data
Data
Name
Name
Name
Name
Inputs
Outputs
Inputs
Outputs
Size
Size
Size
Size
16
1
8
8
ManufacturingID & Lock Byte
A maximum of 255 iterations can be run through the crunch engine. A 1 in this filed will
compute one Iteration through the crunch engine.
Crunch engine input bytes.
Crunch engine output bytes.
Description
Description
Description
Description
Section 1.5.1.
5277C–CryptoCompanion–9/09
Once Locked, the