AT88SC0104C_03 Просмотр технического описания (PDF) - Atmel Corporation

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производитель

AT88SC0104C_03

CryptoRF™ EEPROM Memory 1 Kbits

Atmel Corporation 

Checksum

Supervisor Mode

Modify Forbidden

Program Only

The PICC implements a data validity check function in the form of a checksum. The

checksum may function in standard or cryptographic mode.

In the standard mode, the checksum is optional and may be used for transmission error

detection; however, communication error detection capability is already provided by the

mandatory CRC and this capability is redundant. In standard mode, the host may read a

checksum from the device to verify that the data sent was correctly written.

The cryptographic mode is more powerful since it provides data origin authentication

capability in the form of a Message Authentication Code (MAC); only the host/device

that carried out a valid authentication is capable of computing a valid MAC. The

cryptographic mode is automatically activated when a successful authentication is

carried out. To write data to the device, the host is required to compute a valid MAC and

provide it to the device.

If after an ingoing command the device computes a MAC different from the MAC

transmitted by the host, not only is the command abandoned but the cryptographic

mode is also reset. A new authentication is required to reactivate the cryptographic

mode.

Enabling this feature allows the holder of one specific password to gain full access to all

eight password sets, including the ability to change passwords.

No write access is allowed in a user zone protected with this feature at any time. The

user zone must be written during device personalization prior to blowing the security

fuses.

For a user zone protected by this feature, data within the zone may be changed from a

“1” to a “0”, but never from a “0” to a “1”.

Tuning Capacitance

The capacitance between the coil pins AC1 and AC2 is 82 pF nominal and may vary

over ±10% over temperature and process variation.

Reliability

Table 4. Reliability

Parameter

Write endurance

Data retention

Min

Typ

100,000

–

10

–

Max

Units

–

Write

Cycles

–

Years

Mechanical

Engineering Samples

Engineering samples are available in Atmel’s RF modules or ISO7810 ID-1 plastic

cards.

8 AT88SC0104CRF

5021AS–CRRF–05/03

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