ST25R3916 datasheet(18/157 Pages) STMICROELECTRONICS

18 / 157 page

Description

ST25R3916/7

18/157

DS12484 Rev 4

2.2.12

TX encoding

This block encodes the transmit frames according to the selected RF mode and bit rate. The

SOF (start of frame), EOF (end of frame), CRC and parity bits are generated automatically.

The data to transmit are taken from the FIFO.

In Stream mode the framing is bypassed. The FIFO data directly defines the modulation

data sent to the transmitter.

In Transparent mode, the framing and FIFO are bypassed, and the MOSI pin directly drives

the modulation of the transmitter.

2.2.13

RX decoding

This block decodes received frames according to the selected RF mode and bitrate. The

SOF (start of frame), EOF (end of frame), CRC and parity bits are automatically checked, all

of them (except the CRC bit) are removed by this block. The received data is written to the

FIFO.

In Stream mode the framing is bypassed. The digitized subcarrier signal is directly stored in

the FIFO.

In Transparent mode the framing and FIFO are bypassed. The digitized subcarrier signal

directly drives the MISO pin.

2.2.14

FIFO

The ST25R3916/7 contain a 512-byte FIFO. Depending on the direction of the data transfer,

it contains either data which has been received or data which is to be transmitted.

In reader mode the ST25R3916/7 can transmit frames of up to 8191 bytes length and

receive frames of arbitrary length.

2.2.15

Control logic

The control logic contains I/O registers that define the operation of device.

2.2.16

Host interface

A 4-wire serial peripheral interface (SPI) and a 2-wire I2C interface are available to

communicate with an external microcontroller. The pins for the SPI and the I2C interface are

shared, and pin I2C_EN is used to select the active interface.

2.2.17

Passive target memory

The devices contain a 48-byte RAM to store configuration data for the passive target and

card emulation mode.

2.2.18

P2RAM

The P2RAM stores information on wafer number, die position, device subversion, and I2C

address. The P2RAM is programmed during production.

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