TIR2000 datasheet(13/63 Pages) TI

13 / 63 page

2–1

Functional Description

2.1

Modes of Operation

The TIR2000 operates in six different modes. For proper operation, the device must be programmed

correctly for each mode. The various modes of operation include:

•

Fast-speed infrared (IrDA FIR) mode

•

Medium-speed infrared (IrDA MIR) mode

•

Slow-speed infrared (IrDA SIR) mode

•

SHARP Infrared (IR) mode

•

TV mode

•

Universal asynchronous receiver transmitter (UART) mode

Basic data communication involves at least two devices. During the data transmit mode, the first device

transmits data and the second device receives the transmitted data. During the receive mode, the second

device transmits the data and the first device receives the data. When the device is configured for the UART

mode, both data transmission and data receive can occur simultaneously, but during the infrared (IR) modes

either the data transmit or data receive is possible at any time but not simultaneously. A basic configuration

for two communicating devices in the infrared mode is shown in Figure 2–1.

TIR2000

Xcvr

TIR2000

Xcvr

Ir Pulse

Machine 1

Machine 2

Transmit

TIR2000

Xcvr

TIR2000

Xcvr

Ir Pulse

Machine 1

Machine 2

Receive

Figure 2–1. Basic Configuration for Ir Communication

The TIR2000 has internal programmable registers. Some of the registers are common to all modes of

operation and some are specific to a particular mode of operation. The device is accessed with the industry

standard architecture (ISA) address bus SA[15–0]. An outside address decoder uses ISA signals

(SA[15–4], AEN) and generates the chip select (CS) signal for the TIR2000 device. The lower address bits

SA[3–0] are directly connected to the device. The internal address decoder decodes SA[3–0] lower address

bits to access the different registers.

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