Abridged data sheet – Rainbow Electronics MAX66140 User Manual
Page 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
8
+ X
5
+ X
4
+ 1.
The other CRC is a 16-bit type, generated according to
the CRC-16-CCITT polynomial function (see Figure 18)
X
16
+ X
12
+ X
5
+ 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
______________________________________________________________________________________
29
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