RM0319 datasheet(247/368 Pages) STMICROELECTRONICS

247 / 368 page

RM0319

Fast infrared port (IRDA)

Doc ID 022640 Rev 3

247/368

19.3

Functional description

Figure 87 shows the dataflow block diagram of the FIrDA controller.

Figure 87.

Dataflow block diagram of the FIrDA controller

19.3.1

Synchronization unit

The synchronization unit block allows to synchronize the RX signal of the off-chip IrDA

transceiver. The RX signal is sampled by the rising edge of the irda_clk clock signal for

synchronization.

If the synchronization unit detects an activity of the RX signal in the listening state, the FIrDA

controller switches to the reception state and sets the RXS bit of the IrDA_STAT register,

then a signal detected interrupt (SD_INT, Section 19.4) is generated.

Synchronization Unit

Modulation Unit

Demodulation Unit

Wrapper Unit

Synchronization

Bus interface

FIFO Unit

Status & Control

Registers

Data Registers

Interrupt & DMA

Registers

Irda_clk

bus_clk

Internal Bus

RX Frame

TX Frame

Baud

Generation

Unit

En_symb

En_pulse

RX Signal

TX Signal

Fast IRDA Interface

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