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XRT72L13

更新时间： 2024-11-08 22:21:59
品牌 Logo 应用领域
艾科嘉 - EXAR 复用器
页数 文件大小 规格书
370页 4067K
描述
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

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PRELIMINARY  
XRT72L13  
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC  
APRIL 2001  
REV. P1.0.6  
• A fully integrated device that supports:  
GENERAL DESCRIPTION  
Multiplexing/Demultiplexing Mode  
Clear Channel DS3 Framer Mode  
High Speed HDLC Controller Mode  
• Supports Multiple Loop-back modes  
• Smooths gapped clock signals  
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.  
• 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  
The XRT72L13 contains an integral DS3 Framer  
which provides Clear Channel DS3 Framing and Er-  
ror Accumulation in accordance with ANSI/ITU-T  
specifications.  
APPLICATIONS  
• M13 Multiplexer/Demuliplexer Applications.  
• Frame Relay Systems  
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.  
• Digital Access and Cross Connect Systems  
• Local Digital Switch  
• Add/Drop Multiplexers  
• DS3 Data/Channel Service Units.  
• Test Equipment  
FEATURES  
FIGURE 1. BLOCK DIAGRAM OF THE XRT72L13 MULTIPLEXER/FRAMER  
TxHDLC[0:7]  
TxHDLCClk  
Send_FCS  
TxHDLC  
Controller  
TxDS1[0:27]  
TxClk[0:27]  
M23  
MUX  
M12  
MUX  
TxPOS  
TxNEG  
TxLine Clk  
Clear Channel  
DS2 or G.747  
Data Streams  
DS3 Framer  
32/64 Bit  
De-Jitter  
FIFO  
RxPOS  
RxNEG  
RxLine Clk  
RxDS1[0:27]  
RxClk[0:27]  
M23  
M12  
DEMUX  
DEMUX  
RxHdlc[0:7]  
RxHDLCClk  
RxIdle  
Microprocessor  
RxHDLC  
Controller  
Interface  
Valid-FCS  
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com  
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