XRT72L50 SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER OCTOBER 2003 REV. 1.2.1 the local terminal equipment to receive data from re- GENERAL DESCRIPTION mote terminal equipment. The XRT72L50, single Channel DS3/E3 Framer IC is designed to accept user data from the Terminal The Microprocessor Interface is used to configure the Equipment and insert this data into the payload bit- Framer IC in different operating modes and monitor fields within an outbound DS3/E3 Data Stream. Fur- the performance of the Framer. ther, the Framer IC is also designed to receive an in- The Performance Monitor Sections consist of a large bound DS3/E3 Data Stream from the Remote Termi- number of Reset-upon-Read and Read-Only regis- nal Equipment and extract out the user data. ters that contain cumulative and one-second statistics The XRT72L50 DS3/E3 Framer device is designed to that reflect the performance/health of the Framer IC/ support full-duplex data flow between Terminal Equip- system. ment and an LIU (Line Interface Unit) IC. The Framer FEATURES Device will transmit, receive and process data in the Transmits, Receives and Processes data in the DS3-C-bit Parity, DS3-M13, E3-ITU-T G.751 and E3- DS3-C-bit Parity, DS3-M13, E3-ITU-T G.751 and ITU-T G.832 Framing Formats. E3-ITU-T G.832 Framing Formats. The XRT72L50 DS3/E3 Framer IC consists of a 1 Channel HDLC Controller - Tx and Rx Transmit section, Receiver section, Performance Interfaces to all Popular Microprocessors Monitor Section and a Microprocessor interface. Integrated Framer Performance Monitor The Transmit Section includes a Transmit Payload Data Input Interface, a Transmit Overhead data Input Available in a 100 Pin PQFP package Interface Section, a Transmit HDLC Controller, a 3.3V Power Supply with 5V Tolerant I/O Transmit DS3/E3 Framer block and a Transmit LIU In- Operating Temperature -40C to +85C terface Block which permits the Terminal Equipment to transmit data to a remote terminal. APPLICATIONS Network Interface Units The Receive Section consists of a Receive LIU Inter- face, a Receive DS3/E3 Framer, a Receive HDLC CSU/DSU Equipment. Controller, a Receive Payload Data Output Interface, PCM Test Equipment and a Receive Overhead Data Interface which allows Fiber Optic Terminals DS3/E3 Frame Relay Equipment FIGURE 1. BLOCK DIAGRAM OF THE XRT72L50 TRST TestMode NibIntf TxOHInd TxOHEnable TxNibFrame TxOHClk T3/E3 TxFrame TxOHFrame Transmit T3/E3 HDLC TxNibClk Overhead T3/E3 Transmit transm it TxAISEn controller TxLnClk Interface Fram er TxOH Input TxFram eRef TxOHIns TxNib TxSer TxLineClk A 8:0 TxPOS D 7:0 TxNEG ALE AS WR R/W LIU P CS T3 FEAC & Data Performance Interrupt Interface/ Interface RDY DTCK Link Controller Monitor Controller Controller RxLineClk Reset RxPOS Int MOTO RxNEG RD DS ExtLOS RxClk RxOHEnable RxOHind T3/E3 Receive T3/E3 T3/E3 RxOHClk RxFrame Fram er HDLC Receive RxOH Receive RxNib controller Output RxRed Overhead RxSer RxOHFrame Interface RxOutClk RxOOF Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com XRT72L50 SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER REV. 1.2.1 FIGURE 2. PIN OUT OF THE XRT72L50 81 GND GND 50 RxNib3/RxHDLCDat3 82 TxNib3/TxHDLCDat3 49 83 TxNib2/TxHDLCDat2 RxNib2/RxHDLCDat2 48 84 TxNib1/TxHDLCDat1 RxNib1/RxHDLCDat1 47 85 TxNib0/TxHDLCDat0 RxNib0/RxHDLCDat0 46 86 TxSer/SndMsg RxSer/RxIdle 45 87 TxAISEn RxAIS 44 88 TxInClk RxClk 43 89 GND GND 42 90 TxFrameRef RxFrame 41 XRT72L50 91 VDD VDD 40 92 D(7) RxOutClk/RxHDLCDat7 39 93 D(6) RxRed 38 94 D(5) RxOOF 37 95 RxLOS D(4) 36 96 RxOHClk/RxHDLCClk D(3) 35 97 D(2) RxOHInd 34 98 RxOH/RxHDLCDat6 D(1) 33 99 RxOHEnable/RxHDLCDat5 D(0) 32 100 RxOHFrame/RxHDLCDat4 GND 31 ORDERING INFORMATION PART NUMBER PACKAGE TYPE OPERATING TEMPERATURE RANGE XRT72L50IQ 14x20mm, 100 Lead Plastic QFP -40C to +85C 2 TDO 1 80 VDD TDI 2 79 DMO VDD 3 78 ExtLOS TRST 4 77 RLOL GND 5 76 RxPOS RDY DTCK 6 75 RxNEG WR R/W 7 74 RxLineClk CS 8 73 NC ALE AS 9 72 GND RD DS 10 71 Req TCK 11 70 RLOOP TMS 12 69 LLOOP Int 13 68 TAOS GND 14 67 TxLev A(0) 15 66 EncoDis A(1) 16 65 TxPOS 17 64 A(2) TxNEG A(3) 18 63 TxLineClk A(4) 19 62 VDD A(5) 20 61 TxFrame A(6) 21 60 GND A(7) 22 59 TxNibClk/SndFCS A(8) 23 58 TxNibFrame/ValFCS VDD 24 57 TxOHFrame/TxHDLCClk NibIntf 25 56 TxOHEnable/TxHDLCDat7 GND 26 55 TxOHInd/TxHDLCDat6 MOTO 27 54 TxOH/TxHDLCDat5 Reset 28 53 TxOHIns/TxHDLCDat4 TestMode 29 52 TxOHClk VDD 30 51 VDD