AS3911 datasheet(125/149 Pages) AMSCO

125 / 149 page

ams Datasheet, Confidential: 2013-Oct [2-03]

AS3911 – 125

Appl icatio n I n f o rm a t i o n

FeliCa Reader Mode

The general recommendation from previous chapter is valid

also for FeliCa reader mode. Bit rates 212 and 424 kb/s are

supported. Bit rates are the same in both (reader to tag and tag

to reader) directions. Modulation reader to tag is AM.

In FeliCa mode the FeliCa frame format is supported.

Figure 118:

FeliCa Frame Format

FeliCa Transmission

In order to transmit FeliCa frame only the Payload data is put in

the FIFO. The number of Payload bytes is defined in the Number

of Transmitted Bytes Register 1 and Number of Transmitted

Bytes Register 2. Preamble length is defined by bits f_p1 and

f_p0 in the ISO14443B and FeliCa Settings Register, default

value is 48 bits, but also other options are possible.

Transmission is triggered by sending direct command Transmit

With CRC. First preamble is sent, followed by SYNC and Length

bytes. Then Payload stored in FIFO is sent, transmission is

terminated by two CRC bytes which are calculated by the

AS3911. Length byte is calculated from ‘number of transmitted

bytes’.

The following equation is used:

length = payload length + 1 = number of transmitted bytes +1

FeliCa Reception

After transmission is done the AS3911 logic starts to parse the

receiver output to detect the Preamble of FeliCa tag reply.

Once the Preamble followed by the two SYNC bytes is detected

the Length byte and Payload data are put in the FIFO. CRC bytes

are internally checked.

NFCIP-1 Operation

The AS3911 supports all NFCIP-1 initiator modes and active

communication target modes. All NFCIP-1 bit rates (106, 212

and 424 kbit/s) are supported.

Preamble: 48 data bits all logical 0

Sync:

2 bytes (B2h, 4Dh)

Length:

Length byte (value= payload length + 1), the length range is from 2 to 255

Payload:

Payload

CRC:

2 bytes

Preamble

SYNC

Length

Payload

CRC

AS3911 Datasheet(PDF) 125 Page - ams AG

AS3911 Datasheet(HTML) 125 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL