ATECC608A datasheet(51/81 Pages) MICROCHIP

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The input value, typically a nonce from a remote device, is combined with the current TempKey value to create

a shared nonce in which both devices can attest to the inclusion of the RNG.

5.3.4.1

GenDig - Config

Data from the Configuration zone can be included in the GenDig calculation. Data are always included in 32-byte

blocks and only one block may be included on any given GenDig calculation. The Nonce command must be run prior

to the first GenDig command to load a value into TempKey. Subsequent GenDig commands will use the value stored

in TempKey from the previous GenDig operation.

Table 5-67. Input Parameters GenDig Config

Opcode

(1 Byte)

Mode

(1 Byte)

KeyID(1)

(2 Bytes)

Data

(0 Bytes)

Description

0x15

0x00

0x00 00

—

Use Configuration Block 0

0x00 01

—

Use Configuration Block 1

0x00 02

—

Use Configuration Block

0x00 03

—

Use Configuration Block 3

Note:

KeyId specifies the Configuration zone block to be used in the TempKey Calculation.

Table 5-68. Output Response - GenDig Config

Name

Size

Description

Response

1 byte

0x00 - If successful. Error code - If the command fails.

Notes: Flag Bits

TempKey.Valid flag will be set to 1 if successful, otherwise it is 0.

TempKey.GenDigData will be set to 0.

Table 5-69. TempKey Calculation - GenDig Config

32 bytes

1 byte

2 bytes

1 byte

2 bytes

25 bytes

32 bytes

Configuration Zone Block

Opcode = 0x15

Mode = 0x00

KeyID[0:1] = 0x0[block] 0x00

SN[8] = Varies by vendor

SN[0:1] = 0x01 0x23

All Zeros

TempKey.Value

5.3.4.2

GenDig - OTP

Data from the OTP zone can be included in the GenDig calculation. Data are always included in 32-byte blocks and

only one block may be included on any given GenDig calculation. The Nonce command must be run prior to the first

GenDig command to load a value into TempKey. Subsequent GenDig commands will use the value from the

previous GenDig operation.

Table 5-70. Input Parameters - GenDig OTP

Opcode

(1 Byte)

Mode

(1 Byte)

KeyID(1)

(2 Bytes)

Data

(0 Bytes)

Description

0x15

0x01

0x00 00

—

Use OTP Block 0 as the KeyID

0x00 01

—

Use OTP Block 1 as the KeyID

ATECC608A-TNGLoRaWAN

Device Commands

Complete Datasheet

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