AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

6.10.

Write System Zone Command with Integrated MAC [$c4] [88RF]

The Write System Zone command with Integrated MAC writes data to the 88RF PICC configuration memory. This

command can only be used when the Encryption Communication mode is active. This command is only available

when the Security fuses are: SEC = 0b, ENC = 0b, SKY = 1b, PER = 1b.

Reader

PICC

Command >

Checksum >

CID

$4

PARAM

ADDR

“L”

DATA 1

DATA 2

……….

DATA “L”

DATA “L+1”

MAC1

MAC2

CRC1

CRC2

Echo Command >

CID

$4

ACK/NACK

STATUS

CRC1

CRC2

6.10.1. Operation

The Write System Zone command with Integrated MAC writes data into the 88RF PICC configuration memory. 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 System 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 Encryption Communication

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 System 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 System 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.

42 AT88SC0808/1616/3216/6416CRF, AT88RF04C

5276C–RFID–3/09

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