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ATECC608A Datasheet(PDF) 53 Page - Microchip Technology |
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ATECC608A Datasheet(HTML) 53 Page - Microchip Technology |
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53 / 81 page  Table 5-75. TempKey Calculation - GenDig Data Size Parameters - MAC Parameters - NoMAC 32 bytes DATA.slot[KeyID] DATA.slot[KeyID] 4 byte Opcode, Mode, KeyID = 0x15, 0x02, 0x0[Slot] 0x00 OtherData[0:3] 1 byte SN[8] = Varies by vendor SN[8] = Varies by vendor 2 bytes SN[0:1] = 0x01 0x23 SN[0:1] = 0x01 0x23 25 bytes All Zeros All Zeros 32 bytes TempKey.Value TempKey.Value 5.3.4.4 GenDig - Shared Nonce In Shared Nonce mode 32 bytes of data are input to this command. This mode is used when a nonce value must be shared between two devices. 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 5-76. Input Parameters GenDig Shared Nonce Opcode (1 Byte) Mode (1 Byte) KeyID(1) (2 Bytes) Data (32 Bytes) Description 0x15 0x03 0x00 0[Slot] Input data 0x80 0[Slot] Input data Note: 1. KeyId specifies the DataZone slot to be used in the TempKey calculation. Only the lowest 32 bytes will be used. Table 5-77. Output Response - GenDig Data Name Size Description Response 1 byte 0x00 - If successful. Error code - If the command fails. Notes: Flag Bits 1. TempKey.Valid flag will be set to 1 if successful, otherwise it is 0. 2. TempKey.GenDigData will be set to 1 indicating a DataZone slot was used in the calculation. 3. TempKey.KeyID will set to the slot specified in the command. Table 5-78. TempKey Calculation - GenDig Shared Nonce Size Parameters - KeyID MSB 0x00 Parameters - KeyID MSB 0x80 32 bytes Input Data TempKey.value 1 byte Opcode = 0x15 Opcode = 0x15 1 byte Mode = 0x03 Mode = 0x03 1 byte LSB of KeyID = 0x0[Slot] LSB of KeyID = 0x0[Slot] 1 byte 0x00 0x00 1 byte SN[8] = Varies by vendor SN[8] = Varies by vendor 2 bytes SN[0:1] = 0x01 0x23 SN[0:1] = 0x01 0x23 25 bytes All Zeros All Zeros 32 bytes TempKey.Value Input Data ATECC608A-TNGLoRaWAN Device Commands © 2020 Microchip Technology Inc. Complete Datasheet DS40002154B-page 53 |
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