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[v1-10] 2018-Apr-27

AS3956 − Detailed Description

NFC Device to MCU Data Flow Protocol

For the data transmission from NFC device to the MCU

employing the Extended mode, a NFC WRITE shall be used. Each

data transfer from NFC device is comprised of four WRITE

commands starting from address FCh and ending at address

FFh. The protocol implemented on a NFC device is expected to

always start the data transmission at address FCh, which signals

the beginning of the communication, and end at address FFh.

Figure 46 depicts regular implementation of the Extended

mode using the WRITE commands.

Figure 46:

Address Space Employed for Communication

FCh

FDh

FEh

FFh

00h

11h

22h

33h

44h

55h

66h

77h

88h

99h

AAh

BBh

CCh

DDh

EEh

FFh

Address space used for communication in

extended mode

...

WRITE FCh,00112233h

ACK, rf_busy = 1,

IRQ RX start = 1

WRITE FDh,44556677h

ACK, rf_data_rdy = 1,

IRQ RX end = 1

WRITE FEh,8899AABBh

WRITE hFF,CCDDEEFFh

ACK

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