XRT72L13 datasheet(72/370 Pages) EXAR

72 / 370 page

XRT72L13

MULTIPLEXER/FRAMER IC

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PRELIMINARY

REV. 1.0.6

Figure 30 indicates that when the XRT72L13 has

been configured to operate in the "Clear Channel

DS3 Framer Local Loop-back" Mode, then the follow-

ing internal connections are made.

• The TxPOS output signal is routed into the RxPOS

input pin.

• The TxNEG output signal is routed into the RxNEG

input pin

• The TxLineClk output clock signal is routed into the

RxLineClk input pin.

1.2.1.1.2

Remote Loop-back Mode

Figure 31 presents an illustration of the XRT72L13

M13 Multiplexer/Framer IC operating in the "Clear

Channel DS3 Framer Remote Loop-back" Mode.

FIGURE 30. ILLUSTRATION OF THE XRT72L13 M13 MULTIPLEXER/FRAMER OPERATING IN THE "CLEAR CHANNEL

DS3 FRAMER LOCAL LOOP-BACK" MODE

Transmit Payload

Data Input

Interface Block

Transmit DS3

Framer Block

Transmit

LIU

Interface

Block

Receive LIU

Interface

Block

Receive DS3

Framer Block

Receive Payload

Data Output

Interface Block

Microprocessor

Interface

TxSer

TxNib[3:0]

TxInClk

MOTO

D[7:0]

A[8:0]

IntB*

CSB*

RdB_DS

WrB_RW

Rdy_Dtck

Reset*

ALE_AS

RxSer

RxNib[3:0]

RxOutClk

TxPOS

TxNEG

TxLineClk

RxPOS

RxNEG

RxLineClk

Tx LAPD Buffer/

Controller

Rx LAPD Buffer/

Controller

Transmit Overhead

Input

Interface Block

Receive Overhead

Output

Interface Block

TxOHClk

TxOHIns

TxOHInd

TxOH

TxOHEnable

TxOHFrame

TxNibClk

TxFrame

RxNibClk

RxFrame

RxOHFrame

RxOH

RxOHClk

RxOHEnable

RxOHInd

Local

Loop-back

Path

XRT72L13 Datasheet(PDF) 72 Page - Exar Corporation

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