MB89R119B

DS411-00002-4v0-E

7

4. Cyclic Redundancy Check (CRC)

Upon reception of a request from the reader/writer, the transponder shall verify that CRC value is valid. If it

is invalid, it shall discard the frame and shall not answer.

Upon reception of a response from the transponder, the reader/writer is recommended that the reader/writer

verify that the CRC value is valid. If it is invalid, actions to be performed are left to the responsibility of the

reader/writer maker. For error-checking, the 2 bytes CRC are appended to each request and each response,

with each frame, before the EOF.

The CRC is calculated on all the bytes after the SOF up to but not including the CRC field. Method of

calculation is provided in ISO/IEC 13239 and the detail is defined in ISO/IEC 15693-3 and ISO/IEC 18000-

3 (Mode 1) . The initial value of the CRC code provided in ISO/IEC 15693-3 is “FFFFH”.

The CRC code is transferred, beginning with the least significant bit in the least significant byte.

5. Electronic Article Surveillance (EAS) status

EAS status is 1 bit data, which is stored in the system area of memory (FeRAM) . The initial value is “1”.

EAS bit “1” means goods-monitoring status, and EAS bit “0” means that goods-monitoring status is cleared.

EAS status can be written by Write EAS command and can be checked “3DH” block (refer to “ MEMORY

MAP) by Read commands such as Read Signal Block command.

Together with Gate type reader/writer, EAS command can support anti-theft security functions.

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CRC bit/bytes transmission rules

LSByte

MSByte

LSBit

MSBit LSBit

MSBit

CRC 16 (8 Bits)

CRC 16 (8 Bits)

First transmitted bit of the CRC