XRT79L71IB datasheet(4/441 Pages) EXAR

4 / 441 page

XRT79L71

PRELIMINARY

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REV. P1.0.3

1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

TABLE OF CONTENTS

GENERAL DESCRIPTION .................................................................................................1

GENERAL

FEATURES:......................................................................................................................................1

Line Interface Unit ....................................................................................................................................................... 1

DS3/E3 Framer............................................................................................................................................................ 1

ATM/PPP PROTOCOL PROCESSOR........................................................................................................................ 1

Transmit Cell Processing............................................................................................................................................. 1

Receive Cell Processing.............................................................................................................................................. 2

Transmit Packet Processing ........................................................................................................................................ 2

Receive Packet Processing ......................................................................................................................................... 2

Utopia/ System Interface ............................................................................................................................................. 2

Serial Interface ............................................................................................................................................................ 2

APPLICATIONS ...........................................................................................................................................2

FIGURE 1. BLOCK DIAGRAM OF THE XRT79L71 ............................................................................................................................... 2

PRODUCT ORDERING INFORMATION ................................................................................................................2

TABLE 1: PIN OUT OF THE XRT79L71 (TOP VIEW) ........................................................................................................................ 3

TABLE OF CONTENTS ...........................................................................................................1

PIN DESCRIPTIONS.........................................................................................................................................4

MICROPROCESSOR INTERFACE .......................................................................................................................4

TEST AND DIAGNOSTIC ...................................................................................................................................7

GENERAL PURPOSE INPUT AND OUTPUT PINS .................................................................................................8

TRANSMIT SYSTEM SIDE INTERFACE PINS .......................................................................................................8

RECEIVE SYSTEM SIDE INTERFACE PINS .......................................................................................................23

TRANSMIT LINE SIDE SIGNALS ......................................................................................................................35

RECEIVE LINE SIDE SIGNALS ........................................................................................................................36

VDD PINS ...................................................................................................................................................37

GND PINS ...................................................................................................................................................38

NOT CONNECTED PINS.................................................................................................................................38

ELECTRICAL CHARACTERISTICS ................................................................................39

AC ELECTRICAL CHARACTERISTIC INFORMATION ..................................................39

MICROPROCESSOR INTERFACE TIMING FOR REVISION A SILICON ......................................................39

MICROPROCESSOR INTERFACE TIMING - ASYNCHRONOUS INTEL MODE.................................................... 39

TABLE 2: DC ELECTRICAL CHARACTERISTICSS..................................................................................................................... 39

Applies to all TTL-Level Input and CMOS Level Output pins - Ambient Temperature = 25°C .................................. 39

FIGURE 2. ASYNCHRONUS MODE 1 - INTEL TYPE PROGRAMMED I/O TIMING (WRITE CYCLE) ............................................................ 39

FIGURE 3. ASYNCHRONUS MODE 1 - INTEL TYPE PROGRAMMED I/O TIMING (READ CYCLE) ............................................................. 40

TABLE 3: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE, WHEN CONFIGURED TO OPERATE IN THE INTEL ASYNCHRONOUS

MODE ............................................................................................................................................................................ 40

MICROPROCESSOR INTERFACE TIMING - ASYNCHRONOUS MOTOROLA (68K)

MODE................................................................................................................................41

FIGURE 4. ASYNCHRONUS MODE 2 - MOTOROLA 68K PROGRAMMED I/O TIMING (WRITE CYCLE) .................................................... 41

FIGURE 5. ASYNCHRONUS MODE 2 - MOTOROLA 68 PROGRAMMED I/O TIMING (READ CYCLE) ........................................................ 41

MICROPROCESSOR INTERFACE TIMING - POWER PC 403 SYNCHRONOUS MODE42

TABLE 4: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE WHEN CONFIGURED TO OPERATE IN THE MOTOROLA (68K) ASYN-

CHRONOUS

MODE........................................................................................................................................................... 42

FIGURE 6. SYNCHRONOUS MODE 3 - IBM POWERPC 403 INTERFACE TIMING (WRITE CYCLE) ......................................................... 42

FIGURE 7. SYNCHRONOUS MODE 3 - IBM POWERPC 403 INTERFACE TIMING (READ CYCLE)........................................................... 43

TABLE 5: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE, WHEN CONFIGURED TO OPERATE IN THE IBM POWER PC403

MODE ............................................................................................................................................................................ 43

MICROPROCESSOR INTERFACE TIMING - IDT3051/52 MODE ..................................44

FIGURE 8. SYNCHRONOUS MODE 4 - IDT 3051/52 INTERFACE TIMING (WRITE CYCLE) .................................................................... 44

FIGURE 9. SYNCHRONOUS MODE 4 - IDT 3051/52 INTERFACE TIMING (READ CYCLE)...................................................................... 45

TABLE 6: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE, WHEN CONFIGURED TO OPERATE IN THE IBM POWER PC403

MODE ............................................................................................................................................................................ 45

DS3/E3 LIU INTERFACE - LINE SIDE ELECTRICAL CHARACTERISTIC INFORMATION

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