Rainbow-electronics MAX66140 Manual de usuario descargar pdf (Pagina 18)

CRC Generation

The MAX66140 uses two different types of CRCs. One

CRC is an 8-bit type. The equivalent polynomial func-

tion of this CRC is X

+ X

+ 1.

The other CRC is a 16-bit type, generated according to

the CRC-16-CCITT polynomial function (see Figure 18)

+ X

+ 1. This CRC is used for error detec-

tion in request and response data packets and is

always communicated in the inverted form. After all

data bytes are shifted into the CRC generator, the state

of the 16 flip-flops is parallel-copied to a shift register

and shifted out for transmission with the LSb first. For

more details on this CRC, refer to ISO/IEC 15693-3,

Annex C.

MAX66140

ISO 15693-Compliant Secure Memory

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Rainbow-electronics MAX66140 Manual de usuario Pagina 18