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ISO 15693-Compliant 64-Bit UID
Request Data for the Get System Information Command
REQUEST FLAGS
(1 Byte)
COMMAND
2Bh
UID
(8 Bytes)
Response Data for the Get System Information Command (No Error)
RESPONSE
FLAGS
00h
INFO
FLAGS
0Fh
UID
(8 Bytes)
DSFID
(1 Byte)
AFI
(1 Byte)
NUMBER OF
BLOCKS
00h
MEMORY BLOCK
SIZE
07h
IC REFERENCE
(1 Byte)
Detailed Command Descriptions
In the request data graphics of this section, the UID
field is shaded to indicate that the inclusion of the UID
depends on the address mode.
Get System Information
The Get System Information command is the only com-
mand beyond the network function level that the
MAX66100 supports. It allows the master to retrieve
technical information about the MAX66100. The IC ref-
erence code indicates the die revision in hexadecimal
format, such as A1h, A2h, B1h, etc.
CRC Generation
The ISO 15693 standard uses a 16-bit CRC, generated
according to the CRC-16-CCITT polynomial function:
X 16 + X 12 + X 5 + 1 (see Figure 16). 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
15693-3, Annex C.
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 16. CRC-16-CCITT Generator
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