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ISO/IEC 14443 Type B-Compliant
64-Bit UID
CRC Generation
The ISO/IEC 14443 standard uses a 16-bit CRC, gener-
ated according to the CRC-16-CCITT polynomial func-
tion: X 16 + X 12 + X 5 + 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
register and shifted out for transmission with the LSb
first. For more details on this CRC refer to ISO/IEC
14443-3, Annex B, CRC_B encoding.
MSb
POLYNOMIAL = X 16 + X 12 + X 5 + 1
X 0
1ST
STAGE
X 1
2ND
STAGE
X 2
3RD
STAGE
X 3
4TH
STAGE
X 4
5TH
STAGE
X 5
6TH
STAGE
X 6
7TH
STAGE
X 7
8TH
STAGE
LSb
9TH
STAGE
10TH
STAGE
11TH
STAGE
12TH
STAGE
13TH
STAGE
14TH
STAGE
15TH
STAGE
16TH
STAGE
X 8
X 9
X 10
X 11
X 12
X 13
X 14
X 15
X 16
INPUT DATA
Figure 31. CRC-16-CCITT Generator
18
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