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MAX66100

ISO 15693-Compliant 64-Bit UID

______________________________________________________________________________________ 13

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

+ 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

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

15693-3, Annex C.

REQUEST FLAGS COMMAND UID

(1 Byte) 2Bh (8 Bytes)

RESPONSE

FLAGS

INFO

FLAGS

UID DSFID AFI

NUMBER OF

BLOCKS

MEMORY BLOCK

SIZE

IC REFERENCE

00h 0Fh (8 Bytes) (1 Byte) (1 Byte) 00h 07h (1 Byte)

Request Data for the Get System Information Command

Response Data for the Get System Information Command (No Error)

Figure 16. 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

11TH

STAGE

9TH

STAGE

10TH

STAGE

12TH

STAGE

15TH

STAGE

14TH

STAGE

13TH

STAGE

16TH

STAGE

1 2 ... 8 9 10 11 12 13 14 15 16

MAX66100 1

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