AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

AT88SC0808/1616/3216/6416CRF, AT88RF04C

J.7.

AAC Registers

The Authentication Attempt Counters contain a value which indicates how many unsuccessful Authentication attempts

have been made using the Key Index of the corresponding Secret Seed. Table 88, Table 89 and Table 90 shows

coding of the AAC register. If the AAC reaches the maximum count of 4 or 8 on 88SC PICCs, then the corresponding

key set is locked and all subsequent Authentication attempts will fail. If the AAC reaches the maximum count of 15 on

88RF PICCs, then the corresponding key set is locked and all subsequent Authentication attempts will fail.

If the AAC contents are corrupted, or are programmed with an undefined value, then the corresponding key set is

locked and all subsequent Authentication attempts will fail. The AAC registers can always be read using the Read

System Zone command.

Table 88. Authentication Attempt Counter Coding for the Default Configuration of 88SC PICCs.

AAC Register

Description

$FF

No Failed Attempts

$EE

1 Failed Attempt

$CC

2 Failed Attempts

$88

3 Failed Attempts

$00

4 Failed Attempts (LOCK)

All Other Values Are Not Supported

Table 89. Authentication Attempt Counter Coding for the Extended Trials Allowed Configuration of 88SC PICCs.

AAC Register

Description

$FF

No Failed Attempts

$FE

1 Failed Attempt

$FC

2 Failed Attempts

$F8

3 Failed Attempts

$F0

4 Failed Attempts

$E0

5 Failed Attempts

$C0

6 Failed Attempts

$80

7 Failed Attempts

$00

8 Failed Attempts (LOCK)

All Other Values Are Not Supported

5276C–RFID–3/09

111

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