CS5535 datasheet(125/555 Pages) NSC

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4.11 UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER AND IR PORT CONTROLLER

The Universal Asynchronous Receiver Transmitter and IR

Port (UART/IR Controller) is an enhanced serial port with

fast IR (infrared). The UART/IR Controller provides

advanced, versatile serial communications features with IR

capabilities and supports:

• UART (Section 4.11.1.1 "UART Mode" on page 127)

• Sharp-IR (Section 4.11.1.2 "Sharp-IR Mode" on page

128)

• IrDA 1.0 SIR (Section 4.11.1.3 "SIR Mode" on page 128)

• Consumer Electronic IR (CEIR); also called TV Remote

or Consumer remote control (Section 4.11.1.4 "CEIR

Mode" on page 128)

In UART mode, the functional block can act as a standard

16450 or 16550, or in extended mode.

Existing 16550-based legacy software is completely and

transparently supported. Organization and specific fall-

back mechanisms switch the functional block to 16550

compatibility mode upon reset, or when initialized by 16550

software.

This functional block has two DMA channels, of which the

device can use one or both. One channel is required for IR-

based applications, since IR communication works in half-

duplex fashion. Two channels are normally needed to han-

dle high-speed, full duplex, UART-based applications.

Figure 4-33 shows the serial port connections to the

peripheral devices and host, as well as the device configu-

ration.

Features

• Fully compatible with 16550 and 16450 devices (except

modem)

• Extended UART mode

• Sharp-IR

• IrDA 1.0 SIR with up to 115.2 kbaud data rate

• Consumer-IR mode

• UART mode data rates up to 1.5 Mbps

• Full duplex infrared frame transmission and reception

• Transmit deferral

• Automatic fallback to 16550 compatibility mode

• Selectable 16 and 32 level FIFOs

• 12-bit timer for infrared protocol support

• DMA handshake signal routing for either 1 or 2 channels

• Support for power management

• Virtual dongle interface

Figure 4-33. UART/IR Overview Diagram

Microprocessor

Master Bus

Local Bus Interface

DMA Controller

Virtual Dongle

Interface

SuperI/O Bus and DMA

Tx and Rx UART/IR Logic

UART Interface

IR Interface

MSR_DON

MSR_CONFIG

MSR_RSVD

MSR_MOD

Local Bus to SuperI/O Bus Converter and Control Logic

ID[3:0]

IRSL0_DS

IRSL[2:0]

Modem/Control Signals

UART/IR Controller

SOUT

SIN

IRTX

IRRX1

IRQ

Interrupt Controller

BUSY

CCU

MHZ48_CLK

Interface

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