IRCC datasheet(19/79 Pages) SMSC

19 / 79 page

INFRARED DATA ASSOCIATION

Description

The Infrared Data Association (IrDA) was created

to develop an interoperable, low-cost, low-power,

half-duplex serial data interconnection standard

that supports a walk-up, point-to-point user

model that is adaptable to a wide range of

appliances and devices.

The IrDA Serial Infrared Data Link Standard,

Version 1.1 is the standard to which the SMSC

IrCC conforms. Relevant IrDA documents in this

specification include the SIR-Physical Layer

Specification, Version 1.1, October 17, 1995, the

SIR-Link Access Protocol (IrLAP), Version 1.0,

June 23, 1994, and the Link Management

Protocol (IrLMP), Version 1.1, January 23, 1996.

The high-speed extensions (FIR) to the IrDA

physical layer as described in the SIR-Physical

Layer

Specification

appear

alternate

modulation and demodulation paths for data from

IrLAP bound for the IR medium and are

transparent to IrLAP as it is defined for SIR.

IR hardware and software must comply as a

system

with

the

entire

family

IrDA

specifications, including the SIR/FIR-Physical

Layer Specifications, IrLAP, and IrLMP.

A block diagram of one end of an IrDA link that

includes

the

SIR

and

FIR

physical

implementations is shown in Figure 11.

SIR Interaction Pulse

The SIR Interaction Pulse (SIP) is intended to

guarantee non-disruptive coexistence with SIR-

only systems which might otherwise interfere with

Fast IR links.

A SIP is defined as a 1.6 microsecond

transmitter

pulse

followed

7.1

microseconds of off time (Figure 12). Once a

Fast connection has been established the station

must generate one SIP every 500ms.

1.152Mb/s

4Mb/s

SIR Encoder

SCE

Transceiver

Module

IR Out

IR In

FIR Encoders

UART

SIP

FIGURE 11 - IRCC IRDA BLOCK DIAGRAM

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