ATECC508A datasheet(10/109 Pages) MICROCHIP

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Device Organization

The ATECC508A contains an integrated EEPROM storage memory and SRAM buffer.

The EEPROM memory contains a total of 11,200 bits and is divided into the following zones:

Table 2-1. ATECC508A Zones

Zone

Description

Nomenclature

Data

Zone of 1,208 bytes (9.7 Kb) split into 16 general purpose read-only

or read/write memory slots of 36 bytes (288 bits), 72 bytes (576 bits),

or 416 bytes (3,328 bits) each that can be used to store keys (public

or private), signatures, certificates, calibration, model number, or

other information, typically that relate to the item to which the

ATECC508A device is attached. The access policy of each data slot

is determined by the values programmed into the corresponding

configuration values. However, the policies become effective upon

setting the LockValue byte only.

Slot<YY> = The entire

contents stored in Slot

YY of the Data zone.

Configuration

Zone of 128 bytes (1,024-bit) EEPROM that contains the serial

number and other ID information, as well as, access policy

information for each slot of the data memory. The values

programmed into the configuration zone will determine the access

policy of how each data slot will respond. The configuration zone can

be modified until it has been locked (LockConfig set to !

=0x55). In order to enable the access policies, the LockValue byte

must be set. (See section above)

SN<a:b> = A range of

bytes within a field of the

Configuration zone.

One Time

Programmable

(OTP)

Zone of 64 bytes (512 bits) of OTP bits. Prior to locking the OTP

zone, the bits may be freely written using the standard Write

command. The OTP zone can be used to store read-only data or

one-way fuse type consumption logging information.

OTP<bb> = A byte within

the OTP zone, while

OTP<aa:bb> indicates a

range of bytes.

Terms discussed within this document will have the following meanings:

Table 2-2. Document Terms

Term

Meaning

Block

A single 256-bit (32-byte) area of a particular memory zone. The industry SHA-256

documentation also uses the term “block” to indicate a 512-bit section of the message input.

Within this document, this convention is used only when describing hash input messages.

KeyID

KeyID is equivalent to the slot number for those slots designated to hold key values. Key 1 is

stored in Slot<1> and so on. While all 16 slots can potentially hold keys, those slots which are

configured to permit clear-text reads would not normally be used as private or secret keys by the

crypto commands.

param<b>

Indicates bit b of a command parameter or configuration byte.

SRAM

Contains input and output buffers, as well as state storage locations. See Section Static RAM

(SRAM) Memory.

2.1

EEPROM Data Zone

The data zone is broken into 16 slots, for which access restrictions are individually programmable. While

all slots can be used for private or secret keys or user data, only slots 8 through 15 are large enough to

ATECC508A

Device Organization

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