ATSHA204 ATMEL [ATMEL Corporation], ATSHA204 Datasheet - Page 51

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ATSHA204

Manufacturer Part Number
ATSHA204
Description
Atmel CryptoAuthentication
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet

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8.11
Random Command
This command generates a random number for use by the system.
Random numbers are generated through a combination of the output of a hardware random number generator and an internal
seed value stored in the EEPROM or SRAM. The external system may choose to update the internally stored EEPROM seed
value prior to the generation of the random number as part of the execution of the nonce or random command, though the
endurance limitations of the EEPROM limit the number of times that this update can be performed. After the endurance limit
has been reached, attempts to update the EEPROM seed return an error.
The random command does not provide a mechanism to integrate an input number with the internal stored seed. If this
functionality is desired, the system should use the Nonce command and ignore the generated nonce.
Prior to the configuration section being locked, the random number generator produces a value of 0xFF, 0xFF, 0x00, 0x00,
0xFF, 0xFF, 0x00, 0x00 to facilitate testing.
Note:
Table 8-30. Input Parameters
Table 8-31. Output Parameter
Table 8-32. Mode Encoding
Opode
Param1
Param2
Data
Name
RandOut
Bits
1-7
0
Meaning
Must be zero.
0: Automatically update EEPROM seed only if necessary prior to random number generation
1: Generate random number using existing EEPROM seed; do not update EEPROM seed.
Name
RANDOM
Mode
Zero
-
Recommended for highest security.
The same internally stored seeds are used for both the Nonce and Random commands. Use of Mode=0 ensures
that the EEPROM is updated, if necessary.
Size
Size
32
1
1
2
0
Notes
The output of the random number generator.
Notes
0x1B
Controls the mechanism of the internal random number generator and seed update.
Must be 0x0000
-
Atmel ATSHA204 [DATASHEET]
8740D−CRYPTO−3/12
51

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