AS3953B datasheet(25/65 Pages) AMSOSRAM

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[v1-04] 2016-Jan-07

AS3953B − Detailed Description

Figure 33:

First Byte of the ISO 14443-4 PCD Block

Note(s):

1. RATS and PPS are only processed by the AS3953B logic in case they are sent according to the ISO 14443-4 specification (RATS is first

command sent after entry in ACTIVE(*) state, optionally followed by PPS). In case RATS or PPS are sent once the AS3953B logic is in

PROTOCOL state the information received is saved into FIFO and not acted upon.

2. Compatible with old and new S(PARAMETERS) definition: Old: 1100 x000 is S(PARAMETERS) block according to the ISO 14443-4/AM2.

New: 1111 x000 is S(PARAMETERS) block according to the modification SC17/WG8.

As shown in Figure 33, the block data is put in the FIFO

whenever the two MSB bits are 00 or 10 and also in the case

when the four MSB bits are 1111. Therefore the implemented

communication between the PCD and a tag implemented by

the AS3953B and a controller does not need to follow the Block

transmission protocol defined in the ISO 14443-4.

Use of CID

As mentioned above the AS3953B decides depending on

content of the first byte of received message to either execute

received message as a command or to put it in the FIFO. The

second byte of the message comprises a CID number which is

attributed by PCD. PCD will use CID number in case more PICCs

are brought to Level-4 of communication at the same time.

CID is only checked for messages (commands) that are executed

by the AS3953B. In case CID does not match such a command

is rejected (no action is taken).

Messages that are based on first byte are put in FIFO and are

not filtered by CID. It is left to controller to check for the CID

and decide whether or not to reply (CID number is stored in the

RATS Register).

First Byte

Comment

Action of PICC Logic

1110 0000

RATS

Replies with ATS (1)

1110 not(0000)

Block is put in FIFO

1101 xxxx

PPS

Replies with PPS response

(second character is CID)(1)

1100 x 010

DESELECT

Replies and go to Halt

1100 x not(010)

See note (2)

Block is put in FIFO

1111 xxxx

WTX, S(PARAMETERS), RFU (1)

Block is put in FIFO since controller needs it to

implement chaining

01xx xxxx

Proprietary command

Proprietary command is processed

00xx xxxx

I-block

Block is put in FIFO

10xx xxxx

R-block

AS3953B 数据表(PDF) 25 Page - ams-OSRAM AG

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