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XRT79L71 Datasheet(PDF) 5 Page - Exar Corporation |
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XRT79L71 Datasheet(HTML) 5 Page - Exar Corporation |
5 / 109 page XRT79L71 I REV. 1.0.0 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE 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 P RODUCT ORDERING INFORMATION .....................................................................................................3 TABLE 1: PIN OUT OF THE XRT79L71 (TOP VIEW) ........................................................................................................................ 4 1.0 REGISTER MAP/DESCRIPTION OF THE XRT79L71 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR- CHANNEL FRAMER WITH LIU IC (SEE 79L71-REGISTER/MAP-DESC.PDF) .................................... 5 2.0 PIN DESCRIPTIONS .............................................................................................................................. 5 PIN DESCRIPTIONS ........................................................................................................................................ 5 MICROPROCESSOR INTERFACE....................................................................................................................... 5 TEST AND DIAGNOSTIC ................................................................................................................................10 GENERAL PURPOSE INPUT AND OUTPUT PINS .............................................................................................. 12 TRANSMIT SYSTEM SIDE INTERFACE PINS .................................................................................................... 12 RECEIVE SYSTEM SIDE INTERFACE PINS ...................................................................................................... 33 TRANSMIT LINE SIDE SIGNALS...................................................................................................................... 50 RECEIVE LINE SIDE SIGNALS........................................................................................................................ 52 VDD PINS ................................................................................................................................................... 54 GND PINS................................................................................................................................................... 54 NOT CONNECTED PINS ................................................................................................................................55 3.0 1.0.0BRIEF XRT79L71 ARCHITECTURE DESCRIPTION ................................................................. 56 TABLE 2: LISTING OF ARCHITECTURAL/FUNCTIONAL DESCRIPTION DOCUMENTS FOR THE XRT79L71 ............................................... 56 BRIEF FUNCTIONAL ARCHITECTURE DESCRIPTION OF THE XRT79L71 - CLEAR-CHANNEL DS3/E3 FRAMER MODE........................................................................................................................................ 56 FIGURE 2. THE FUNCTIONAL BLOCK DIAGRAM OF THE XRT79L71 WHEN IT HAS BEEN CONFIGURED TO OPERATE IN THE CLEAR-CHANNEL DS3/E3 FRAMER MODE ................................................................................................................................................. 57 A MORE DETAILED FUNCTIONAL/ARCHITECTURAL DESCRIPTION FOR CLEAR-CHANNEL FRAMER MODE ........................................................................................................................................................ 60 BRIEF FUNCTIONAL ARCHITECTURE DESCRIPTION OF THE XRT79L71 - HIGH-SPEED HDLC CON- TROLLER OVER DS3/E3 MODE.............................................................................................................. 60 FIGURE 3. THE FUNCTIONAL BLOCK DIAGRAM OF THE XRT79L71 WHEN IT HAS BEEN CONFIGURED TO OPERATE IN THE HIGH-SPEED HDLC CONTROLLER OVER DS3/E3 MODE................................................................................................................................. 60 A MORE DETAILED FUNCTIONAL/ARCHITECTURAL DESCRIPTION FOR THE HIGH-SPEED HDLC CON- TROLLER MODE ...................................................................................................................................... 64 BRIEF FUNCTIONAL/ARCHITECTURAL DESCRIPTION OF THE XRT79L71 - ATM UNI OVER DS3/E3 MODE ........................................................................................................................................................ 64 FIGURE 4. THE FUNCTIONAL BLOCK DIAGRAM OF THE XRT79L71 WHEN IT HAS BEEN CONFIGURED TO OPERATE IN THE ATM UNI OVER DS3/E3 MODE ............................................................................................................................................................... 64 A MORE DETAILED FUNCTIONAL/ARCHITECTURAL DESCRIPTION FOR THE ATM UNI MODE..... 68 FUNCTIONAL ARCHITECTURE/DESCRIPTION OF THE XRT79L71 - PPP OVER DS3/E3 MODE...... 69 FIGURE 5. THE FUNCTIONAL BLOCK DIAGRAM OF THE XRT79L71 WHEN IT HAS BEEN CONFIGURED TO OPERATE IN THE PPP OVER DS3/ E3 MODE ....................................................................................................................................................................... 69 A MORE DETAILED FUNCTIONAL/ARCHITECTURAL DESCRIPTION FOR THE PPP MODE ............ 73 4.0 INTERRUPT STRUCTURE WITHIN THE XRT79L71 ......................................................................... 73 TABLE 3: LIST OF ALL OF THE POSSIBLE CONDITIONS THAT CAN GENERATE INTERRUPTS WITHIN THE XRT79L71............................. 74 TABLE 4: A LISTING OF THE XRT79L71 ATM UNI/PPP/CLEAR-CHANNEL DS3/E3 FRAMER DEVICE INTERRUPT BLOCK REGISTERS 75 TABLE 5: INTERRUPT SERVICE ROUTINE GUIDE FOR THE XRT79L71 .............................................................................................. 78 TABLE 6: INTERRUPT SERVICE ROUTINE GUIDE FOR THE DS3/E3 FRAMER BLOCK .......................................................................... 79 5.0 REGISTER MAP/DESCRIPTION OF THE XRT79L71 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR- |
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