AS3911 datasheet(135/159 Pages) AMSCO

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ams Datasheet

Page 135

[v2-11] 2016-Jun-13

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AS3911 − Application Information

Support of NFCIP-1Transport Frame Format

Figure 123 depicts the Transport Frame according to NFCIP-1

standard.

Figure 123:

Transport Frame Format According to NFCIP-1

Transport Frame for bit rate 212 and 424 kbit/s has the same

format as communication frame used during Initialization and

SDD. This format is also used in FeliCa protocol (see also FeliCa

Reader Mode). In case of 106 kbit/s the SB (Start byte at F0h)

and LEN (length byte) are only used in Transport Frame.

Support of Transport Frame for 106 kbit/s NFCIP-1

communication is enabled by setting bit nfc_f0 in the

ISO14443A and NFC 106kbit/s Settings Register.

Once this bit is set and ISO 14443A mode with bit rate 106 kbit/s

is configured, the behavior of the AS3911 framing is as follows:

Transmission

In order to transmit a Transport Frame only the Transport Data

has to be put in FIFO. The number of Transport Data bytes is

defined in the Number of Transmitted Bytes Register 1 and

Number of Transmitted Bytes Register 2. Transmission is

triggered by sending direct command Transmit With CRC. First

Start byte with value F0h followed by Length byte are sent. Then

Transport Data stored in FIFO is sent, transmission is terminated

by two CRC bytes (E1 in Figure 123) which are calculated by the

AS3911. Length byte is calculated from ‘number of transmitted

bytes’. The following equation is used:

length = Transport Data length + 1 = number of transmitted

bytes +1

Reception

After transmission is done the AS3911 logic starts to parse the

receiver output to detect the start of tag reply.

Once the start of communication sequence is detected the first

byte (Start Byte with value F0h) is checked the Length byte and

Transport Data bytes are put in the FIFO.

LEN

CMD0

CMD1

Byte 0

Byte 1

Byte 2

…

Byte n

LEN

CMD0

CMD1

Byte 0

Byte 1

Byte 2

…

Byte n

Transport Data Field

Frame Format

for 106 kbps

Frame Format

for 212 kbps

and 424 kbps

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