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XRT72L52

TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

Exar Corporation 

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XRT72L52

FEBRUARY 2005

TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

REV. 1.0.1

GENERAL DESCRIPTION

The XRT72L52, Two Channel DS3/E3 Framer IC is

designed to accept user data from the Terminal

Equipment and insert this data into the payload bit-

fields within an outbound DS3/E3 Data Stream. Fur-

ther, the Framer is also designed to receive an in-

bound DS3/E3 Data Stream from the Remote Termi-

nal Equipment and extract out the user data.

The XRT72L52 DS3/E3 Framer device is designed to

support full-duplex data flow between Terminal Equip-

ment and an LIU (Line Interface Unit) IC. The Framer

Device will transmit, receive and process data in the

DS3-C-bit Parity, DS3-M13, E3-ITU-T G.751 and E3-

ITU-T G.832 Framing Formats.

The XRT72L52 DS3/E3 Framer IC consists of a

Transmit section, Receiver section, Performance

Monitor Section and a Microprocessor interface.

The Transmit Section includes a Transmit Payload

Data Input Interface, a Transmit Overhead data Input

Interface Section, a Transmit HDLC Controller, a

Transmit DS3/E3 Framer block and a Transmit LIU

Interface Block which permits the Terminal Equip-

ment to transmit data to a remote terminal.

The Receive Section consists of a Receive LIU Inter-

face, a Receive DS3/E3 Framer, a Receive HDLC

Controller, a Receive Payload Data Output Interface,

and a Receive Overhead Data Interface which allows

the local terminal equipment to receive data from re-

mote terminal equipment.

The Microprocessor Interface is used to configure the

Framer IC in different operating modes and monitor

the performance of the Framer.

The Performance Monitor Sections consist of a large

number of Reset-upon-Read and Read-Only regis-

ters that contain cumulative and one-second statistics

that reflect the performance/health of the Framer IC/

system.

FEATURES

• Transmits, Receives and Processes data in the

DS3-C-bit Parity, DS3-M13, E3-ITU-T G.751 and

E3-ITU-T G.832 Framing Formats.

• 1 Channel HDLC Controller - Tx and Rx

• Interfaces to all Popular Microprocessors

• Integrated Framer Performance Monitor

• Available in a 160 Pin PQFP package

• 3.3V Power Supply with 5V Tolerant I/O

• Operating Temperature -40°C to +85°C

APPLICATIONS

• Network Interface Units

• CSU/DSU Equipment.

• PCM Test Equipment

• Fiber Optic Terminals

• DS3/E3 Frame Relay Equipment

FIGURE 1. BLOCK DIAGRAM OF THE XRT72L52

TRST

TestMode

NibbleIntf

TxOHEnable

TxOHClk

TxOHFrame

TxAISEn

TxOH

TxOHIns

T3/E3

Transmit

Overhead

Interface

TxLineClk[n:0]

TxPOS[n:0]

TxNEG[n:0]

RxLineClk[n:0]

RxPOS[n:0]

RxNEG[n:0]

ExtLOS

RxOHEnable[n:0]

RxOHClk[n:0]

RxOH[n:0]

RxRed[n:0]

RxOHFrame[n:0]

RxOOF[n:0]

LIU

Interface/

Controller

T3/E3

Receive

Overhead

Interface

Typical Channel n

Where n = 0 or 1

T3/E3 Transmit

Framer

T3/E3

transmit

Input

T3 FEAC & Data

Link Controller

Performance

Monitor

Interrupt

Controller

T3/E3 Receive

Framer

T3/E3

Receive

Output

HDLC

controller

uP

Interface

HDLC

controller

TxOHInd[n:0]

TxNibFrame[n:0]

TxFrame[n:0]

TxNibClk[n:0]

TxLnClk[n:0]

TxFrameRef[n:0]

TxNib[n:0]

TxSer[n:0]

A(11:0)

D(7:0)

ALE_AS

WR_R/W

CS

RDY_DTCK

Reset

INT

MOTO

RD_DS

RxClk[n:0]

RxOHind[n:0]

RxFrame[n:0]

RxNib[n:0]

RxSer[n:0]

RxOUTClk[n:0]

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

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