XRT79L71IB(2003) Ver la hoja de datos (PDF) - Exar Corporation
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XRT79L71IB Datasheet PDF : 441 Pages
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XRT79L71
REV. P1.0.3
PRELIMINARY
áç
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
46
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