ATECC608A datasheet(52/81 Pages) MICROCHIP

52 / 81 page

Note:

KeyId specifies the OTP zone block to be used in the TempKey calculation.

Table 5-71. Output Response - GenDig OTP

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 5-72. TempKey Calculation - GenDig OTP

32 bytes

1 byte

2 bytes

1 byte

2 bytes

25 bytes

32 bytes

OTP 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

5.3.4.3

GenDig - Data

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

and only the lowest block of a slot is included in the GenDig calculation. The Nonce command must be run prior to

the first GenDig command to load a value into TempKey. If the slot requires a random nonce, then the data must be

generated by the Nonce command versus passing it into the device. Subsequent GenDig commands will use the

value from the previous GenDig operation.

If a slot is set for NoMAC, then it is not allowed to use the output of this GenDig in a MAC command. If multiple

GenDigs are run, if any slot has NoMAC set, then the output in TempKey cannot be used in executing a MAC

command.

Table 5-73. Input Parameters - GenDig Data

Opcode

(1 Byte)

Mode

(1 Byte)

KeyID(1)

(2 Bytes)

Data

(0 or 4 Bytes)

Description

0x15

0x02

0x00 0[Slot] —

Use data from slot # in the calculation.

0x00 0[Slot] 4 bytes

Use data from slot # in the calculation and other data when using

a NoMAC key slot

Note:

KeyId specifies the Data zone slot to be used in the TempKey calculation. Only the lowest 32 bytes will be

used.

Table 5-74. Output Response - GenDig Data

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 1 indicating a DataZone slot was used in the calculation.

TempKey.KeyID will set to the slot specified in the command.

TempKey.NoMacFlag will be set to 0 if the MAC command is allowed and 1 if it is not.

ATECC608A-TNGLoRaWAN

Device Commands

Complete Datasheet

DS40002154B-page 52

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