ATECC508A datasheet(75/109 Pages) MICROCHIP

75 / 109 page

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Configuration Zone:

The CRC is calculated over all 128 bytes within the Configuration zone using the current value of

the LockConfig at address 87. If the compare succeeds, then LockConfig will be set to a value of

00.

•

Data and OTP Zone:

The slot contents are concatenated in numerical order to create the input to the CRC algorithm.

Slots that are configured to contain an ECC private key are never included in the summary CRC

calculation. The OTP zone is then concatenated after the last Data slot and the CRC value is

calculated. If the compare succeeds, then LockValue will be set to a value of 00.

If Mode<7> is zero and the input summary does not match that computed on the device, then an error is

returned and the personalization process should be repeated.

For slots containing public keys that must be validated, the most significant four bits are modified by the

device when being written and/or when being validated. The summary CRC is calculated using the

current values.

Table 9-29. Input Parameters

Name

Size

Notes

Opcode

LOCK

0x17

Param1

Mode

See Table 9-31.

Param2

Summary

Summary (CRC) of the designated zones, or should be 0x0000 if Mode<7> is set.

Data

Ignored

—

Table 9-30. Output Parameter

Name

Size

Notes

Success

Upon successful execution, ATECC508A returns a value of zero.

Table 9-31. Mode Encoding

Bits

Meaning

Summary check bit. This bit is ignored when locking individual data slots.

0 = The summary value is verified before the zone is locked.

1 = Check of the zone summary is ignored and the zone is locked regardless of the contents of the zone.

Microchip does not recommend using this mode.

Unused, must be zero.

5–2 The slot number to be locked if bits<1:0> have a value of 0b10; otherwise, these bits must be zero.

1-0

00 =

The Configuration zone is to be locked.

01 =

The Data and OTP zones are to be locked.

10 =

A single slot in the Data zone is to be locked.

11 =

Illegal value, the device will return an error.

ATECC508A

Security Commands

Datasheet Complete

DS20005927A-page 75

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