XRT79L71IB datasheet(60/109 Pages) EXAR

60 / 109 page

XRT79L71

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE

REV. 1.0.0

Figure 2 indicates that the XRT79L71 consists of the following functional blocks.

• The Transmit Payload Data Input Interface Block

• The Transmit Overhead Data Input Interface Block

• The Transmit LAPD Controller Block

• The Transmit FEAC Controller Block (DS3, C-bit Parity Applications Only)

• The Transmit Trail-Trace Message Controller Block (E3, ITU-T G.832 Applications Only)

• The Transmit SSM Controller Block (E3, ITU-T G.832 Applications Only)

• The Transmit DS3/E3 Framer Block

• The Transmit DS3/E3 LIU Block

• The Receive DS3/E3 LIU Block

• The Receive DS3/E3 Framer Block

• The Receive SSM Controller Block (E3, ITU-T G.832 Applications Only)

• The Receive Trail-Trace Message Controller Block (E3, ITU-T G.832 Applications Only)

• The Receive FEAC Controller Block (DS3, C-bit Parity Applications Only)

• The Receive LAPD Controller Block

• The Receive Payload Data Output Interface Block

• The Receive Overhead Data Output Interface Block

Each of these functional blocks is briefly discussed below.

These functional blocks will be discussed in

considerable detail throughout this data sheet.

FIGURE 2. THE FUNCTIONAL BLOCK DIAGRAM OF THE XRT79L71 WHEN IT HAS BEEN CONFIGURED TO OPERATE IN

THE

CLEAR-CHANNEL DS3/E3 FRAMER MODE

Transmit Payload

Data Input

Interface Block

Transmit DS3/E3

Framer Block

DS3/E3

Jitter

Attenuator

Block

DS3/E3

Jitter

Attenuator

Block

DS3/E3

Jitter

Attenuator

Block

DS3/E3

Jitter

Attenuator

Block

Receive DS3/E3

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

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

Transmit

DS3/E3

LIU Block

Transmit

DS3/E3

LIU Block

Receive

DS3/E3

LIU Block

Receive

DS3/E3

LIU Block

TTIP

TRING

RTIP

RRING

Only one JA exists.

Can be configured in

Tx or Rx Path

XRT79L71IB Datasheet(PDF) 60 Page - Exar Corporation

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