XRT79L72 Datasheet, PDF (4/72 Pages) Exar Corporation – 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L72
REV. P1.0.2
PRELIMINARY
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2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
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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