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XRT79L72 Datasheet(PDF) 4 Page - Exar Corporation |
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XRT79L72 Datasheet(HTML) 4 Page - Exar Corporation |
4 / 72 page XRT79L72 PRELIMINARY xr REV. P1.0.2 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC I TABLE OF CONTENTS HARDWARE MANUAL ......................................................................................................1 GENERAL FEATURES:......................................................................................................................................1 Line Interface Unit ....................................................................................................................................................... 1 DS3/E3 Framer............................................................................................................................................................ 1 ATM/PPP PROTOCOL PROCESSOR........................................................................................................................ 1 Transmit Cell Processing............................................................................................................................................. 1 Receive Cell Processing.............................................................................................................................................. 1 Transmit Packet Processing ........................................................................................................................................ 2 Receive Packet Processing ......................................................................................................................................... 2 Utopia/ System Interface ............................................................................................................................................. 2 Serial Interface ............................................................................................................................................................ 2 APPLICATIONS ...........................................................................................................................................2 FIGURE 1. BLOCK DIAGRAM OF THE XRT79L72 ............................................................................................................................... 2 PRODUCT ORDERING INFORMATION ................................................................................................................3 TABLE OF CONTENTS ............................................................................................................ I PIN DESCRIPTIONS.........................................................................................................................................4 MICROPROCESSOR INTERFACE .......................................................................................................................4 TEST AND DIAGNOSTIC ...................................................................................................................................6 GENERAL PURPOSE INPUT AND OUTPUT PINS.................................................................................................7 TRANSMIT SYSTEM SIDE INTERFACE PINS.......................................................................................................7 RECEIVE SYSTEM SIDE INTERFACE PINS.......................................................................................................24 TRANSMIT LINE SIDE SIGNALS ......................................................................................................................39 RECEIVE LINE SIDE SIGNALS ........................................................................................................................41 ELECTRICAL CHARACTERISTICS ................................................................................46 TABLE 1: DC ELECTRICAL CHARACTERISTICSS..................................................................................................................... 46 Applies to all TTL-Level Input and CMOS Level Output pins - Ambient Temperature = 25°C .................................. 46 AC ELECTRICAL CHARACTERISTIC INFORMATION ..................................................46 MICROPROCESSOR INTERFACE TIMING FOR REVISION A SILICON ......................................................46 MICROPROCESSOR INTERFACE TIMING - ASYNCHRONOUS INTEL MODE.................................................... 46 FIGURE 2. ASYNCHRONUS MODE 1 - INTEL TYPE PROGRAMMED I/O TIMING (WRITE CYCLE) ............................................................ 46 FIGURE 3. ASYNCHRONUS MODE 1 - INTEL TYPE PROGRAMMED I/O TIMING (READ CYCLE) ............................................................. 47 TABLE 2: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE, WHEN CONFIGURED TO OPERATE IN THE INTEL ASYNCHRONOUS MODE ............................................................................................................................................................................ 47 MICROPROCESSOR INTERFACE TIMING - ASYNCHRONOUS MOTOROLA (68K) MODE................................................................................................................................48 FIGURE 4. ASYNCHRONUS MODE 2 - MOTOROLA 68K PROGRAMMED I/O TIMING (WRITE CYCLE) .................................................... 48 FIGURE 5. ASYNCHRONUS MODE 2 - MOTOROLA 68 PROGRAMMED I/O TIMING (READ CYCLE) ........................................................ 48 TABLE 3: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE WHEN CONFIGURED TO OPERATE IN THE MOTOROLA (68K) ASYN- CHRONOUS MODE........................................................................................................................................................... 49 MICROPROCESSOR INTERFACE TIMING - POWER PC 403 SYNCHRONOUS MODE49 FIGURE 6. SYNCHRONOUS MODE 3 - IBM POWERPC 403 INTERFACE TIMING (WRITE CYCLE) ......................................................... 49 FIGURE 7. SYNCHRONOUS MODE 3 - IBM POWERPC 403 INTERFACE TIMING (READ CYCLE)........................................................... 50 TABLE 4: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE, WHEN CONFIGURED TO OPERATE IN THE IBM POWER PC403 MODE ............................................................................................................................................................................ 50 DS3/E3 LIU INTERFACE - LINE SIDE ELECTRICAL CHARACTERISTIC INFORMATION 51 E3 LINE SIDE PARAMETERS .........................................................................................................................51 FIGURE 8. PULSE MASK FOR E3 (34.368MBPS) INTERFACE AS PER ITU-T G.703 ........................................................................... 51 TABLE 5: E3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS........................................................ 51 DS3 LINE SIDE PARAMETERS .......................................................................................................................52 FIGURE 9. BELLCORE GR-499-CORE PULSE TEMPLATE REQUIREMENTS FOR DS3 APPLICATIONS.................................................. 52 TABLE 6: DS3 PULSE MASK EQUATIONS ........................................................................................................................................ 53 TABLE 7: DS3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS (GR-499) ................................. 53 TRANSMIT UTOPIA INTERFACE....................................................................................54 FIGURE 10. TIMING DIAGRAM FOR THE TRANSMIT UTOPIA INTERFACE BLOCK ................................................................................ 54 TABLE 8: TIMING INFORMATION FOR THE TRANSMIT UTOPIA INTERFACE BLOCK ............................................................................. 54 |
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