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AS3953A − Detailed Description

Configuration Word

The Configuration word is used to define the AS3953A

operating options. It is delivered by ams with default setting.

Figure 36:

Configuration Word (Bits 31 to 16)

Notes:

1. Configuration bits b31 to b15 define AS3953A response to SAK and ATS command in ISO 14443A Protocol modes, while bits b14 to

b0 actually change performance.

2. Incase both nl4 and nfc are set, the nl4 setting prevails.

Configuration

Bit

Name

Default

Function

b31

fsci<3>

FSCI. Default value (2h) codes maximum size of frame

accepted by PICC to 32 bytes which is the size of the

FIFO. Please note that the AS3953A can support larger

frame sizes in case FIFO is read during the receiving.

b30

fsci<2>

b29

fsci<1>

b28

fsci<0>

b27

fwi<3>

FWI (default value (6h) defines frame waiting time of

~19.3ms)

b26

fwi<2>

b25

fwi<1>

b24

fwi<0>

b23

dr_sdr

1: Only the same bit rate for both directions supported

(TA(1) of ATS)

b22

dr_picc_8

1: DR=8 PICC-to-PCD supported (848kbit/s) (TA(1) of

ATS)

b21

dr_picc_4

1: DR=4 PICC-to-PCD supported (424kbit/s) (TA(1) of

ATS)

b20

dr_picc_2

1: DR=2 PICC-to-PCD supported (212kbit/s) (TA(1) of

ATS)

b19

dr_pcd_8

1: DR=8 PCD-to-PICC supported (848kbit/s) (TA(1) of

ATS)

b18

dr_pcd_4

1: DR=4 PCD-to-PICC supported (424kbit/s) (TA(1) of

ATS)

b17

dr_pcd_2

1: DR=2 PCD-to-PICC supported (212kbit/s) (TA(1) of

ATS)

b16

nl4

1: SAK on Cascade Level 2 reports that tag is not ISO

14443-4 compatible

b15

nfc

1: SAK on Cascade Level 2 reports that tag is NFC passive

target

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