XRT72L13 datasheet(73/370 Pages) EXAR

73 / 370 page

áç

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13

PRELIMINARY

REV. 1.0.6

Figure 31 indicates that when the XRT72L13 has

been configured to operate in the "Clear Channel

DS3 Framer Remote Loop-back" Mode, then the fol-

lowing internal connections are made:

• The RxPOS input signal is routed to the TxPOS

output pin.

• The RxNEG input signal is routed to the TxNEG

output pin.

• The RxLineClk output clock signal is routed to the

TxLineClk input pin.

1.2.1.1.3

PRBS Generator/Receiver

In order to support diagnostic testing of the signal

path, the XRT72L13 contains a PRBS Generator and

Receiver. This feature can be operated in conjunc-

tion with (or not) with the "Clear Channel DS3 Framer

Local" or "Remote" Loop-back Modes.

A more detailed description of this feature will be pre-

sented in the next revision of the XRT72L13 Data

Sheet.

1.3

XRT72L13 OPERATION WHILE IN THE

"HIGH SPEED HDLC CONTROLLER" MODE

Figure 32 presents a Functional Block Diagram of the

XRT72L13 M13 Multiplexer/Framer IC, when it has

been configured to operate in the "High Speed HDLC

Controller Mode"

FIGURE 31. ILLUSTRATION OF THE XRT72L13 M13 MULTIPLEXER/FRAMER OPERATING IN THE "CLEAR CHANNEL

DS3 FRAMER REMOTE 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

Remote

Loop-back

Path

XRT72L13 Datasheet(PDF) 73 Page - Exar Corporation

XRT72L13 Datasheet(HTML) 73 Page - Exar Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL