SRIX4K datasheet(13/50 Pages) STMICROELECTRONICS

Part #	SRIX4K

Description	13.56 MHz short-range contactless memory chip with 4096-bit EEPROM, anticollision and anti-clone functions

PDF	50 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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13 / 50 page

SRIX4K

Data transfer

13/50

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 Appendix A. The initial register

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

CRC 16 (8 bits)

LSbit

MSbit

LSbit

MSbit

LSByte

MSByte

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SRIX4K Datasheet(PDF) 13 Page - STMicroelectronics