AT88RF04C-MY1G 查看數據表（PDF） - Atmel Corporation

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AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

AT88SC0808/1616/3216/6416CRF, AT88RF04C

6.5. Read User Zone Command with Integrated MAC [$c2] [88RF]

The Read User Zone command with Integrated MAC reads data from the currently selected User Zone on 88RF

PICCs. This command can only be used when the Authentication or Encryption Communication Security mode is

active.

Reader

PICC

Command >

PARAM = $80 >

CID

$2

PARAM

ADDR

“L”

CRC1

CRC2

Echo Command >

CID

$2

NACK

STATUS

CRC1

CRC2

FAILURE RESPONSE

< Error Code

Echo Command >

CID

$2

ACK

DATA 1

DATA 2

……….

DATA “L”

DATA “L+1”

MAC1

MAC2

STATUS

CRC1

CRC2

SUCCESS RESPONSE

< Checksum

< Status Code

6.5.1.

Operation

The Read User Zone command with Integrated MAC reads data from the 88RF device's currently selected User Zone

and also returns the cryptographic checksum. If the RCS bit of the DCR register is set to 1b, then the cryptographic

engine is reset after the checksum is read. If the RCS bit of the DCR register is set to 0b, then the cryptographic

engine is not reset by this command.

The data byte address is internally incremented as each byte is read from memory. Reading beyond the end of the

current User Zone is prohibited. Only PICCs in the Active State are permitted to answer this command. If the

Authentication or Encryption Communication Security mode is not active, then a NACK response is returned.

If the Encryption Communication Security mode is active, then the DATA bytes are encrypted. In Authentication

Communication Security mode the DATA bytes are not encrypted.

27

5276C–RFID–3/09

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