Rainbow-electronics MAX66000 Bedienungsanleitung PDF herunterladen (Seite 18)

MAX66000

ISO/IEC 14443 Type B-Compliant

64-Bit UID

18 ______________________________________________________________________________________

Figure 31. CRC-16-CCITT Generator

1ST

STAGE

MSb

LSb

2ND

STAGE

7TH

STAGE

8TH

STAGE

6TH

STAGE

3RD

STAGE

4TH

STAGE

5TH

STAGE

POLYNOMIAL = X

+ X

+ 1

INPUT DATA

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STAGE

9TH

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10TH

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12TH

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15TH

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14TH

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13TH

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16TH

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CRC Generation

The ISO/IEC 14443 standard uses a 16-bit CRC, gener-

ated according to the CRC-16-CCITT polynomial func-

tion: X

+ X

+ 1 (Figure 31). This CRC is used

for error detection in request and response data pack-

ets 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

first. For more details on this CRC refer to ISO/IEC

14443-3, Annex B, CRC_B encoding.

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MAX66000 1
64-Bit UID 1

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