IRCC datasheet(76/79 Pages) SMSC

76 / 79 page

OUTPUT MULTIPLEXER

The Output Multiplexer routes the active

encoder/decoder to one of three IrCC serial

communications ports. There are no restrictions

on any of these connections other than Rx/Tx

source pairs go to the same destination (Figure

49). Descriptions of the Block Control, Output

Mux. and Aux IR signals can be found in the

SCE Configuration Registers in Register Block

One.

There are Rx and Tx Polarity controls that

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 zero (default),

inactive outputs will be one.

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 16550A

serial port specification. The Tx/Rx Polarity bits

do not apply when COM mode is selected.

There is a provision for added transmit current

capacity by selectively duplicating the transmit

output of the IR Port or the COM Port at the AUX

Port.

This can be used, for example, to

accommodate the high-power optics found in

Consumer IR TV remote controls.

There are GP Data pins that always reflects the

state of General Purpose Data & Fast bits (5-6)

of Line Control Register A, in Register Block

Zero, Address Four. The state of the G.P. Data

pins is independent of the IrCC Block Controls or

the Output Multiplexer.

IRRx

IRTx

ARx

ATx

CRx

CTx

nDSR

nRTS

nDTR

nCTS

nDCD

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

FIGURE 49 - OUTPUT MULTIPLEXER BLOCK

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