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

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AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

6.8. Write User Zone Command with Integrated MAC [$c3] [88RF]

The Write User Zone command with Integrated MAC writes data into the currently selected User Zone of 88RF PICCs.

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

Reader

PICC

Command >

PARAM = $80 >

Checksum >

CID

$3

PARAM

ADDR

“L”

DATA 1

DATA 2

……….

DATA “L”

DATA “L+1”

MAC1

MAC2

CRC1

CRC2

Echo Command >

CID

$3

ACK/NACK

STATUS

CRC1

CRC2

6.8.1. Operation

The Write User Zone command with Integrated MAC writes data in the 88RF device's currently selected User Zone. As

each byte is clocked in to the memory the lower bits of the address are internally incremented. The upper address bits

are not incremented, so the page address remains constant.

Write operations cannot cross page boundaries; a Write User Zone command can only write data bytes within a single

physical memory page. Attempts to write beyond the end of the page boundary will wrap to the beginning of the same

page. 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 checksum does not match, then

a NACK response is returned, the write operation is aborted, and the cryptographic engine is reset.

The Write User Zone command with Integrated MAC includes an automatic data verification function. After the

EEPROM write is complete the data verification logic reads the new EEPROM contents and compares it to the data

received in the Write User Zone command. If the data does not match the PICC returns a NACK response with $ED in

the status byte. If the data matches, the PICC returns an ACK response.

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.

36 AT88SC0808/1616/3216/6416CRF, AT88RF04C

5276C–RFID–3/09

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