IRCC datasheet(56/79 Pages) SMSC

56 / 79 page

Consumer IR Mode

Transmit

nActiveFrame goes active as soon as the

Consumer IR transmitter starts modulating the

SCE data stream.

nActiveFrame becomes

inactive as soon as the transmit register is

empty.

Receive

nActiveFrame goes active as soon as the

Consumer IR receiver detects the first active bit-

time of infrared energy. nActiveFrame becomes

inactive whenever the Consumer IR receiver is

manually disabled, a DMA Terminal Count has

occurred, or following a FIFO Overrun.

IRDA ENCODER

Description

The IrDA FIR Encoder supports the synchronous

bit-oriented HDLC protocol at .576Mbps and

1.152Mbps, and 4PPM Encoding at 4Mbps

including all message framing, bit stuffing, and

CRC generation (Figure 21).

The IrDA FIR

Encoder exchanges only payload data with the

host and supports Multi-Frame Windows for brick

walled messages as well as BOF and BW

framing extensions. The IrDA FIR Encoder also

includes an SIR Interaction Pulse generator in

hardware.

SCE

4PPM

Encoder

HDLC

Encoder

Framing

4PPM

Decoder

HDLC

Decoder

Control & Status

SIP

Generator

FIGURE 21 - IrDA FIR ENCODER

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