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XRT73L03IV Datasheet(PDF) 6 Page - Exar Corporation |
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XRT73L03IV Datasheet(HTML) 6 Page - Exar Corporation |
6 / 62 page XRT73L03 3 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT áç áç áç áç PRELIMINARY REV. P1.0.13 III Figure 29. A channel in the XRT73L03 operating in the Analog Local Loop-Back Mode .............................. 46 COMMAND REGISTER CR4-(N) ....................................................................................................... 46 4.2 THE DIGITAL LOCAL LOOP-BACK MODE. .......................................................................................................... 47 Figure 30. The Digital Local Loop-Back path in a given channel of the XRT73L03 ........................................ 47 COMMAND REGISTER CR4-(N) ....................................................................................................... 47 4.3 THE REMOTE LOOP-BACK MODE ...................................................................................................................... 48 Figure 31. The Remote Loop-Back path in a given XRT73L03 Channel ........................................................ 48 COMMAND REGISTER CR4-(n) ....................................................................................................... 48 4.4 TXOFF FEATURES ........................................................................................................................................... 48 COMMAND REGISTER CR1-(N) ....................................................................................................... 49 TABLE 6: THE RELATIONSHIP BETWEEN THE TXOFF INPUT PIN, THE TXOFF BIT FIELD AND THE STATE OF THE TRANS- MITTER ............................................................................................................................................... 49 4.5 THE TRANSMIT DRIVE MONITOR FEATURES ....................................................................................................... 49 Figure 32. The XRT73L03 employing the Transmit Drive Monitor Features ................................................... 50 4.6 THE TAOS (TRANSMIT ALL ONES) FEATURE ................................................................................................... 50 5.0 The Microprocessor Serial Interface .............................................................................................. 50 5.1 DESCRIPTION OF THE COMMAND REGISTERS ..................................................................................................... 50 COMMAND REGISTER CR1-(N) ....................................................................................................... 50 TABLE 7: ADDRESSES AND BIT FORMATS OF XRT73L03 COMMAND REGISTERS ................................................. 51 5.2 DESCRIPTION OF BIT-FIELDS FOR EACH COMMAND REGISTER ........................................................................... 52 5.2.1 Command Register - CR0-(n) ............................................................................................................ 52 COMMAND REGISTER CR0-(N) ........................................................................................................ 52 COMMAND REGISTER CR1-(N) ....................................................................................................... 52 5.2.3 Command Register CR2-(n) .............................................................................................................. 53 COMMAND REGISTER CR2-(N) ....................................................................................................... 53 COMMAND REGISTER CR3-(N) ....................................................................................................... 54 COMMAND REGISTER CR4-(N) ....................................................................................................... 54 TABLE 8: CONTENTS OF LLB(N) AND RLB(N) AND THE CORRESPONDING LOOP-BACK MODE FOR CHANNEL(N) .... 55 5.3 OPERATING THE MICROPROCESSOR SERIAL INTERFACE. ................................................................................... 55 Figure 33. Microprocessor Serial Interface Data Structure ............................................................................. 56 Figure 34. Timing Diagram for the Microprocessor Serial Interface ................................................................ 57 ORDERING INFORMATION ............................................................................................. 58 PACKAGE DIMENSIONS ................................................................................................. 58 REVISION HISTORY ..................................................................................................................................... 59 |
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