AS3953B datasheet(28/65 Pages) AMSOSRAM

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Page 27

[v1-04] 2016-Jan-07

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AS3953B − Detailed Description

Figure 35:

Configuration Word (Bits 31 to 16)

Note(s):

1. Configuration bits b31 to b15 define AS3953B 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 AS3953B 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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