Detailed Description
ISO-14443 and NFCIP Framing
This block performs ISO-14443 and NFCIP-1 106 kbps active
communication framing for receive and transmit according to
the selected ISO mode and data rate settings.
• In reception, it takes demodulated subcarrier signal from
Receiver. It recognizes the SOF, EOF and data bits;
performs parity and CRC check; organizes the received
data in bytes and places them in the FIFO.
• During transmit, it operates inversely; it takes bytes from
FIFO; generates parity and CRC bits; adds SOF and EOF;
and performs final encoding before passing modulation
signal to transmitter.
• In Transparent mode, the framing and FIFO are bypassed;
the digitized subcarrier signal, which is Receiver output is
directly sent to SDATAO pin; signal applied to SDATAI pin
is directly used to modulate the transmitter.
FIFO
The AS3909/10 contains a 32byte FIFO. Depending on the
mode, it contains either data that has been received or data that
is to be transmitted.
Control Logic
The control logic contains I/O registers, which define the
operation of device.
SPI Interface
A 4-wire Serial Peripheral interface (SPI) is used for
communication between external microcontroller and the
AS3909/10.
ams Datasheet, Confidential: 2013-Oct [3-02]
AS3909/AS3910 – 13