srix4k STMicroelectronics, srix4k Datasheet - Page 13

• Manufacturer Part Number: srix4k
• Description: 13.56mhz Short Range Contactless Memory Chip With 4096 Bit Eeprom, Anti-collision And Anti-clone Functions
• Manufacturer: STMicroelectronics

SRIX4K
3.4
CRC
The 16-bit CRC used by the SRIX4K is generated in compliance with the ISO 14443 Type B
recommendation. For further information, please see
contents are all 1s: FFFFh.
The two-byte CRC is present in every Request and in every Answer Frame, before the EOF.
The CRC is calculated on all the bytes between SOF (not included) and the CRC field.
Upon reception of a Request from a reader, the SRIX4K verifies that the CRC value is valid.
If it is invalid, the SRIX4K discards the frame and does not answer the reader.
Upon reception of an Answer from the SRIX4K, the reader should verify the validity of the
CRC. In case of error, the actions to be taken are the reader designer’s responsibility.
The CRC is transmitted with the Least Significant Byte first and each byte is transmitted with
the least significant bit first.
Figure 11. CRC transmission rules
LSbit
CRC 16 (8 bits)
LSByte
MSbit
LSbit
Appendix
A. The initial register
CRC 16 (8 bits)
MSByte
Data transfer
ai07667
MSbit
13/50