PDF XRT73R12 Data sheet ( Hoja de datos )

Número de pieza	XRT73R12
Descripción	TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
Fabricantes	Exar Corporation
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No Preview Available ! www.DataSheet4U.com PRELIMINARY XRT73R12 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT OCTOBER 2003 GENERAL DESCRIPTION The XRT73R12 is a twelve channel fully integrated Line Interface Unit (LIU) featuring EXAR’s R3 Technology (Reconfigurable, Relayless Redundancy) for E3/DS3/STS-1 applications. The LIU incorporates 12 independent Receivers and Transmitters in a single 420 Lead TBGA package. Each channel of the XRT73R12 can be independently configured to operate in E3 (34.368 MHz), DS3 (44.736 MHz) or STS-1 (51.84 MHz). Each transmitter can be turned off and tri-stated for redundancy support or for conserving power. The XRT73R12’s differential receiver provides high noise interference margin and is able to receive data over 1000 feet of cable or with up to 12 dB of cable attenuation. REV. P1.0.3 The XRT73R12 provides a Parallel Microprocessor Interface for programming and control. The XRT73R12 supports analog, remote and digital loop-backs. The device also has a built-in Pseudo Random Binary Sequence (PRBS) generator and detector with the ability to insert and detect single bit error for diagnostic purposes. APPLICATIONS • E3/DS3 Access Equipment • DSLAMs • Digital Cross Connect Systems • CSU/DSU Equipment • Routers • Fiber Optic Terminals FIGURE 1. BLOCK DIAGRAM OF THE XRT 73R12 CS RD WR Addr[7:0] D[7:0] PCLK RDY INT Pmode RESET RTIP_n RRing_n TTIP_n TRing_n MTIP_n MRing_n DMO_n ICT µProcessor Interface XRT73R12 Peak Detector AGC/ Equalizer Slicer Local LoopBack Clock & Data Recovery LOS Detector Clock Synthesizer MUX Remote LoopBack HDB3/ B3ZS Decoder Line Driver Device Monitor Tx Pulse Shaping Tx Control Timing Control HDB3/ MUX B3ZS Encoder Channel 0 Channel n... Channel 11 CLKOUT_n SFM_en RLOL_n E3Clk DS3Clk STS-Clk/12M RxClk_n RxPOS_n RxNEG/LCV_n RLOS_n TxClk_n TxPOS_n TxNEG_n TxON PART NUMBER XRT73R12IB ORDERING INFORMATION PACKAGE 420 Lead TBGA OPERATING TEMPERATURE RANGE -40°C to +85°C Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com 1 page PRELIMINARY XRT73R12 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT REV. P1.0.3 TABLE 23: CHANNEL LEVEL INTERRUPT STATUS REGISTER - CR225 (ADDRESS LOCATION = 0XE1)....................................................... 63 TABLE 24: DEVICE/PART NUMBER REGISTER - CR110 (ADDRESS LOCATION = 0X6E) ........................................................................... 64 TABLE 25: CHIP REVISION NUMBER REGISTER - CR111 (ADDRESS LOCATION = 0X6F) ......................................................................... 64 THE PER-CHANNEL REGISTERS........................................................................................................................... 65 REGISTER DESCRIPTION - PER CHANNEL REGISTERS .................................................................................... 66 TABLE 26: XRT73R12 REGISTER MAP SHOWING INTERRUPT ENABLE REGISTERS (IER_N).................................................................. 66 TABLE 27: SOURCE LEVEL INTERRUPT ENABLE REGISTER - CHANNEL N ADDRESS LOCATION = 0XM1 .................................................... 66 TABLE 28: XRT73R12 REGISTER MAP SHOWING INTERRUPT STATUS REGISTERS (ISR_N).................................................................. 68 TABLE 29: SOURCE LEVEL INTERRUPT STATUS REGISTER - CHANNEL N ADDRESS LOCATION = 0XM2 .................................................... 68 TABLE 30: XRT73R12 REGISTER MAP SHOWING ALARM STATUS REGISTERS (AS_N) .......................................................................... 70 TABLE 31: ALARM STATUS REGISTER - CHANNEL N ADDRESS LOCATION = 0XM3................................................................................... 70 TABLE 32: XRT73R12 REGISTER MAP SHOWING TRANSMIT CONTROL REGISTERS (TC_N)................................................................... 73 TABLE 33: TRANSMIT CONTROL REGISTER - CHANNEL N ADDRESS LOCATION = 0XM4 ........................................................................... 73 TABLE 34: XRT73R12 REGISTER MAP SHOWING RECEIVE CONTROL REGISTERS (RC_N) .................................................................... 75 TABLE 35: RECEIVE CONTROL REGISTER - CHANNEL N ADDRESS LOCATION = 0XM5 ............................................................................. 75 TABLE 36: XRT73R12 REGISTER MAP SHOWING CHANNEL CONTROL REGISTERS (CC_N) ................................................................... 76 TABLE 37: CHANNEL CONTROL REGISTER - CHANNEL N ADDRESS LOCATION = 0XM6 ............................................................................ 76 TABLE 38: XRT73R12 REGISTER MAP SHOWING ERROR COUNTER MSBYTE REGISTERS (EM_N)........................................................ 79 TABLE 39: ERROR COUNTER MSBYTE REGISTER - CHANNEL N ADDRESS LOCATION = 0XMA................................................................. 79 TABLE 40: XRT73R12 REGISTER MAP SHOWING ERROR COUNTER LSBYTE REGISTERS (EL_N).......................................................... 79 TABLE 41: ERROR COUNTER LSBYTE REGISTER - CHANNEL N ADDRESS LOCATION = 0XMB.................................................................. 80 TABLE 42: XRT73R12 REGISTER MAP SHOWING ERROR COUNTER HOLDING REGISTERS (EH_N) ........................................................ 80 TABLE 43: ERROR COUNTER HOLDING REGISTER - CHANNEL N ADDRESS LOCATION = 0XMC ................................................................ 81 8.0 ELECTRICAL CHARACTERISTICS ................................................................................................... 82 TABLE 44: ABSOLUTE MAXIMUM RATINGS ............................................................................................................................................. 82 TABLE 45: DC ELECTRICAL CHARACTERISTICS:..................................................................................................................................... 82 ORDERING INFORMATION .................................................................................................................. 83 PACKAGE DIMENSIONS - .............................................................................................................................................. 83 REVISIONS .................................................................................................................................................................. 84 III 5 Page PRELIMINARY TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT XRT73R12 REV. P1.0.3 RECEIVE LINE SIDE PINS PIN # SIGNAL NAME TYPE B22 AE22 B18 AE18 A14 AF14 D13 AC13 B9 AE9 B5 AE5 RTip0 RTip1 RTip2 RTip3 RTip4 RTip5 RTip6 RTip7 RTip8 RTip9 RTip10 RTip11 I C22 AD22 C18 AD18 B14 AE14 C13 AD13 C9 AD9 C5 AD5 RRing0 RRing1 RRing2 RRing3 RRing4 RRing5 RRing6 RRing7 RRing8 RRing9 RRing10 RRing11 I DESCRIPTION Receive TIP Input These input pins along with the corresponding RRing_n input pin function as the Receive DS3/E3/STS-1 Line input signal for a given channel of the XRT73R12. Cconnect this signal and the corresponding RRING_n input signal to a 1:1 transformer. Whenever the RTIP/RRING input pins are receiving a positive-polarity pulse within the incoming DS3, E3 or STS-1 line signal, this input pin will be pulsed to a higher voltage than its corresponding RRING_n input pin. Conversely, whenever the RTIP/RRING input pins are receiving a negative- polarity pulse within the incoming DS3, E3 or STS-1 line signal, this input pin will be pulsed to a lower voltage than its corresponding RRING_n input pin. Receive Ring Input These input pins along with the corresponding RTIP_n input pin function as the Receive DS3/E3/STS-1 Line input signal for a given channel of the XRT73R12. Connect this signal and the corresponding RTIP_n input signal to a 1:1 trans- former. (See Figure 6) Whenever the RTIP/RRING input pins are receiving a positive-polarity pulse within the incoming DS3, E3 or STS-1 line signal, then this input pin will be pulsed to a lower voltage than its corresponding RTIP_n input pin. Conversely, whenever the RTIP/RRING input pins are receiving a negative- polarity pulse within the incoming DS3, E3 or STS-1 line signal, then this input pin will be pulsed to a higher voltage than its corresponding RTIP_n input pin. 8 11 Page

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