AT88SC6416CRF-MR1 查看數據表（PDF） - Atmel Corporation

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AT88SC6416CRF-MR1

CryptoRF® Specification

Atmel Corporation 

AT88SC0808/1616/3216/6416CRF, AT88RF04C

O.7.

CRC Error Detection

A 2 byte CRC_B is required in each frame transmitted by the PICC or PCD to permit transmission error detection. The

CRC_B is calculated on all of the command and data bytes in the frame. For encrypted data the encryption is

performed prior to CRC_B calculation. The SOF, EOF, start bits, stop bits, and EGT are not included in the CRC_B

calculation. The two byte CRC_B follows the data bytes in the frame.

Figure 51. Location of the two CRC_B bytes within a frame.

SOF

K data bytes

CRC1

CRC2

EOF

The CRC_B polynomial is defined in ISO/IEC 14443 and ISO/IEC 13239 as x16 + x12 + x5 + x0. This is a hex polynomial

of $1021. The initial value of the register used for the CRC_B calculation is all ones ($FFFF). When receiving

information from the reader, the PICC computes the CRC on the incoming command, data, and CRC bytes. After the

last bit has been processed the CRC register should contain $0000.

In the example illustrated in Figure 51, the CRC_B is calculated on the “K” bytes of data and then appended to the

data. CRC1 is the least significant byte and CRC2 is the most significant byte of the CRC_B. If the CRC_B was

calculated as $5A6B, then CRC1 is $6B and CRC2 is $5A.

O.8.

Type A Tolerance

The RF Interface is designed for use in multi-protocol applications. It will not latch or lock up if exposed to Type A

signals and will not respond to them. The PICC may reset in the presence of Type A field modulation, but is not

damaged by exposure to Type A signals.

In a typical multi-protocol application the reader will poll for Type B cards and complete all transactions with any Type B

cards present in the field. The reader will then poll for Type A cards and complete all transactions with them. The

reader alternates between the two types of modulation and protocols.

5276C–RFID–3/09

139

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