XRT79L71IB datasheet(5/109 Pages) EXAR

5 / 109 page

XRT79L71

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

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-

XRT79L71IB Datasheet(PDF) 5 Page - Exar Corporation

XRT79L71IB Datasheet(HTML) 5 Page - Exar Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL