AS3953A-BDFM datasheet(23/71 Pages) AMSOSRAM

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[v1-05] 2019-Feb-15

AS3953A − Detailed Description

TC(1): The interface byte TC(1) specifies a parameter of the

protocol. The interface byte TC(1) consists of two parts:

• The most significant bits b8 to b3 are set to 000000, all

other values are ‘RFU’.

• The bits b2 and b1 define which optional fields in the

prolog field are supported by the PICC. The PCD is allowed

to skip fields that are supported by the PICC. Bit b2

indicates support of CID and b1 indicates support of NAD.

The AS3953A value is ‘10’ indicating “CID supported” and

“NAD not supported”.

Figure below defines the coding of the TC(1) byte.

Figure 24:

TC(1) Byte Coding

Proprietary Commands

Proprietary commands have the same format as blocks defined

in ISO 14443-4 with the difference that optional NAD field is

abandoned since NAD is not supported by the AS3953A. The

same format is used for commands sent by PCD and AS3953A

responses. Figure below defines the coding of the proprietary

commands.

Figure 25:

Proprietary Commands Coding

Prolog field consists of the mandatory Protocol Control Byte

and an optional Card Identifier Byte. Card identifier byte is

according to ISO 14443-4 definition. Epilog field contains CRC

over transmitted block.

MSB

LSB

Description

0000010

Coding of ATS byte TC(1)

CID

NAD

Prolog Field

Information Field

Epilog Field

PCB

[CID]

INF

EDC

1 byte

2 bytes

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