MB89R118C datasheet(7/47 Pages) RAMXEED

7 / 47 page

MB89R118C

DS411-00001-6v0-E

4. Cyclic Redundancy Check (CRC)

When a frame is received, reception of correct data making up the frame is assumed only when the value

of the cyclic redundancy check (CRC) code is valid. For error-checking purposes, a 2-byte CRC code value

is inserted between data and the EOF signal.

The value of CRC code is required from all the data contained between the SOF and CRC field in each

frame. Method of calculation is provided in ISO/IEC 13239. The details are provided 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 lowest-order bit in the lowest-order byte.

5. Electronic Article Surveillance (EAS) status

EAS status is 1 bit data (LSB side) , which is stored in the system area of 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 “FBH” block (refer to “ MEMORY

MAP”) by Read commands such as Read Single Block command.

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

MSBit

LSBit

MSByte

LSByte

LSBit

CRC 16 (8 Bits)

First transmitted bit of the CRC



CRC bit/byte transition order

MB89R118C Datasheet(PDF) 7 Page - RAMXEED LIMITED