AT88SC3216CRF-MVB1G Atmel, AT88SC3216CRF-MVB1G Datasheet - Page 139

• Manufacturer Part Number: AT88SC3216CRF-MVB1G
• Description: CRYPTOMEMORY 32KBIT 16ZONE MVB
• Manufacturer: Atmel
• Series: CryptoMemory®, CryptoRF®r

Specifications of AT88SC3216CRF-MVB1G

• Rf Type: Read / Write
• Frequency: 13.56MHz
• Features: ISO1444-2, 1444-3, 32-kbits
• Package / Case: MVB Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

O.7.
O.8.
5276C–RFID–3/09
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.
The CRC_B polynomial is defined in ISO/IEC 14443 and ISO/IEC 13239 as x
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.
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.
SOF
Location of the two CRC_B bytes within a frame.
AT88SC0808/1616/3216/6416CRF, AT88RF04C
K data bytes
16
CRC1
+ x
12
+ x
5
+ x
0
. This is a hex polynomial
CRC2
EOF
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