AT88SC018 datasheet(13/33 Pages) ATMEL

13 / 33 page

CryptoCompanion Chip

5277C–CryptoCompanion–9/09

1.5.13. Memory Initialization Values

Upon shipment from the Atmel factory, the following locations will have predefined values. The contents of all other

locations are not guaranteed by Atmel.

Table 11.

Predefined Initial Memory Values

Name

Initial Value

SHA Constant

Defined by FIPS PUB 180-1.This is written at the Atmel factory and cannot subsequently be

changed.

EncKey

Customer Specific, Contact Atmel. See Section 1.5.2 for more details.

ManufacturingID

A unique value for all AT88SC018 chips, see Section 1.5.3

Lock

xxxx_xx10 or xxxx_xx00, per Sections 1.5.1 & 1.5.2. Consult Atmel for ordering information.

RNGSeed

Random values for each AT88SC018. See Section 1.5.6

Dev

TWI bus address, shipped as 0xC0. See Section 1.5.4

CF0 – CF15

Random values for each AT88SC018. See Section 1.5.10

Certain values within the AT88SC018 memory array MUST be properly programmed prior to locking of the memory.

Failure to properly initialize these locations will result in unpredictable and/or unsecure operation of the part.

Table 12.

Customer Defined Memory Values

Name

Initial Value

SystemSecret,

CmcSecret

These values are used to perform a mutual authentication between the AT88SC018 and the

system processor. See the Startup (Section 3.2) and ChallengeResponse (Section 3.3) for more

details.

RW_Bound

The boundary between ReadOnly and ReadWrite memory. See Sections 1.5.7 & 1.5.8 for more

information.

F_Bound

Controls the number of F secrets in the array, see Section 1.5.9 for value limitations.

Mode

The lower 2 bits control the way in which VerifyFlash is run, see Section 3.1 for more details.

The upper 5 bits MUST be ‘0’ for proper operation; other values may result in security or

functional issues.

FlashDigest

If Mode.Bit[1:0] is set to 0, then this must be set to the proper value per the descriptions in the

VerifyFlash command, see Section 3.1.

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