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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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XRT72L13 датащи(PDF) 1 Page - Exar Corporation |
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XRT72L13 датащи(HTML) 1 Page - Exar Corporation |
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1 / 370 page  Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com áç áç áç áç PRELIMINARY XRT72L13 M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC APRIL 2001 REV. P1.0.6 GENERAL DESCRIPTION The XRT72L13 is a fully integrated, low power, Multi- plexer/Framer IC which performs Multiplexing/De- mutiplexing of 28 DS1or 21 E1 signals into/from a DS3 signal with either M13 or C-bit parity frame for- mat, performs Clear Channel DS3 Framing, and sup- ports High speed HDLC/LAPD data linking. The XRT72L13 also contains M12 and M23 bit-inter- leaving multiplexing/demultiplexing functions with necessary stuffing and destuffing control. Seven in- ternal DS2/G.747 framers are included to support Mux/Demux purposes. The XRT72L13 contains an integral DS3 Framer which provides Clear Channel DS3 Framing and Er- ror Accumulation in accordance with ANSI/ITU-T specifications. The XRT72L13 provides the intelligent functions of DS3/DS2 mode control, signaling control, error and alarm reporting and handles the HDLC/LAPD data link through internal registers accessible via an 8-bit parallel, memory mapped, µProcessor interface. FEATURES • A fully integrated device that supports: Multiplexing/Demultiplexing Mode Clear Channel DS3 Framer Mode High Speed HDLC Controller Mode • Supports Multiple Loop-back modes • Smooths gapped clock signals • Supports Intel or Motorola PIO µP interfaces • Available in a 208 pin PQFP package • Single 3.3V Power Supply • 5V Tolerant I/O • Operates over the Industrial Temperature Range APPLICATIONS • M13 Multiplexer/Demuliplexer Applications. • Frame Relay Systems • Digital Access and Cross Connect Systems • Local Digital Switch • Add/Drop Multiplexers • DS3 Data/Channel Service Units. • Test Equipment FIGURE 1. BLOCK DIAGRAM OF THE XRT72L13 MULTIPLEXER/FRAMER TxHDLC Controller TxHDLC Controller RxDS1[0:27] RxClk[0:27] M23 DEMUX M23 DEMUX M23 MUX M23 MUX M12 MUX M12 MUX Clear Channel DS3 Framer Clear Channel DS3 Framer 32/64 Bit De-Jitter FIFO RxHDLC Controller RxHDLC Controller RxHdlc[0:7] RxHDLCClk RxIdle Valid-FCS TxDS1[0:27] TxClk[0:27] TxHDLC[0:7] TxHDLCClk Send_FCS Microprocessor Interface Microprocessor Interface TxPOS TxNEG TxLine Clk RxPOS RxNEG RxLine Clk DS2 or G.747 Data Streams M12 DEMUX |
Аналогичный номер детали - XRT72L13 |
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Аналогичное описание - XRT72L13 |
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