IRCC2.0 datasheet(82/87 Pages) SMSC

82 / 87 page

OUTPUT MULTIPLEXER

The

Output

Multiplexer

routes

the

active

encoder/decoder to one of three IrCC 2.0 serial

communications ports. There are no restrictions

on any of these connections other than Rx/Tx

source pairs go to the same destination (Figure

51).

Descriptions of the Block Control, Output

Mux, and Aux IR signals can be found in the

SCE Configuration Registers in Register Block

One.

The Rx and Tx Polarity controls determine the

active states for the IR port signals, see SCE

Configuration Register A. The state of inactive

IR outputs depends upon the Tx Polarity bit; e.g.,

if Tx Polarity is one (default), inactive outputs will

be 0.

Routing for the COM Port flow-control

signals is fixed. When the COM Port is inactive,

the flow-control signals behave according to the

current SMSC 16C550A serial port specification.

Note: The Tx/Rx Polarity bits do not apply when

COM mode is selected.

There are GP Data pins that reflect the state of

General Purpose Data and Fast bits (5-6) of Line

Control Register A, in Register Block Zero,

Address Four. The state of the GP Data pins is

independent of the IrCC 2.0 Block Controls or

the Output Multiplexer.

Note: This figure is for illustration purposes only and is not intended to suggest specific implementation

details.

nCTS

nDCD

IRRx

IRTx

ARx

ATx

CRx

CTx

nDSR

nRTS

nDTR

nRI

1 to 3

Demux.

3 to 1

Mux.

1 to 6

Demux.

6 to 1

Mux.

2 to 1

Mux.

Raw Rx

Raw Tx

TV Rx

TV Tx

ASK Rx

ASK Tx

IrDA SIR Rx

IrDA SIR Tx

COM Rx

COM Tx

Output

Mux.

Block

Control

Aux.

Port

AUX

Port

COM

Port

Polarity

G.P. Data

GP Data G.P.

Port

IrDA FIR Rx

IrDA FIR Tx

Fast

Transmit

Limiter

Tx PW

Limit

Media

Busy

Detect

RX PW

Reject

FIGURE 51 - OUTPUT MUX WITH TRANSMIT PULSE WIDTH LIMITER

IRCC2.0 Datasheet(PDF) 82 Page - SMSC Corporation

IRCC2.0 Datasheet(HTML) 82 Page - SMSC Corporation

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