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XRT7300IV Datasheet(PDF) 5 Page - Exar Corporation

Part # XRT7300IV
Description  E3/DS3/STS-1 LINE INTERFACE UNIT
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT7300IV Datasheet(HTML) 5 Page - Exar Corporation

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E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7300
REV. 1.1.1
III
COMMAND REGISTER CR2 (ADDRESS = 0X02) .................................................................................. 33
Muting the Recovered Data while the LOS is being Declared............................................................. 33
3.7 ROUTING THE RECOVERED TIMING AND DATA INFORMATION TO THE RECEIVING TERMINAL EQUIPMENT .... 33
COMMAND REGISTER CR3 (ADDRESS = 0X03) .................................................................................. 33
Figure 23. The Typical Interface for the Transmission of Data in a Dual-Rail Format From the Receive Section
of the XRT7300 to the Receiving Terminal Equipment ...................................................................... 34
Figure 24. How the XRT7300 Outputs Data on the RPOS and RNEG Output Pins ........................................ 34
Figure 25.The Behavior of the RPOS, RNEG and RCLK1 Signals When RCLK1 is Inverted ......................... 35
Routing Single-Rail Format data (Binary Data Stream) to the Receive Terminal Equipment ............. 35
COMMAND REGISTER CR3 (ADDRESS = 0X03) .................................................................................. 35
COMMAND REGISTER CR3 (ADDRESS = 0X03) .................................................................................. 35
Figure 26.The Typical Interface for the Transmission of Data in a Single-Rail Format From the Receive Section
of the XRT7300 to the Receiving Terminal Equipment ...................................................................... 36
Figure 27.The Behavior of the RPOS and RCLK1 Output Signals While the XRT7300 is Transmitting Single-Rail
Data to the Receiving Terminal Equipment........................................................................................36
4.0 DIAGNOSTIC FEATURES OF THE XRT7300 ........................................................................................ 36
4.1 THE ANALOG LOCAL LOOP-BACK MODE ................................................................................................. 36
Figure 28.The Analog Local Loop-Back in the XRT7300 ................................................................................. 37
COMMAND REGISTER CR4 (ADDRESS = 0X04) .................................................................................. 37
4.2 THE DIGITAL LOCAL LOOP-BACK MODE .................................................................................................. 37
Figure 29.The Digital Local Loop-Back path in the XRT7300 .......................................................................... 38
COMMAND REGISTER CR4 (ADDRESS = 0X04) .................................................................................. 38
4.3 THE REMOTE LOOP-BACK MODE ............................................................................................................ 38
Figure 30.The Remote Loop-Back Path in the XRT7300 ................................................................................. 39
COMMAND REGISTER CR4 (ADDRESS = 0X04) .................................................................................. 39
4.4 TXOFF FEATURES................................................................................................................................. 40
COMMAND REGISTER CR1 (ADDRESS = 0X01) .................................................................................. 40
4.5 THE TRANSMIT DRIVE MONITOR FEATURES ............................................................................................ 40
Figure 31.The XRT7300 Employing the Transmit Drive Monitor Features....................................................... 40
Figure 32. Two LIU’s, Each Monitoring the Transmit Output Signal of the Other LIU IC ................................. 41
4.6 THE TAOS (TRANSMIT ALL ONES) FEATURE .......................................................................................... 41
COMMAND REGISTER CR1 (ADDRESS = 0X01) .................................................................................. 41
5.0 THE MICROPROCESSOR SERIAL INTERFACE ................................................................................... 42
5.1 DESCRIPTION OF THE COMMAND REGISTERS .......................................................................................... 42
Table 5:Addresses and Bit Formats of XRT7300 Command Registers ........................................................... 42
DESCRIPTION OF BIT-FIELDS FOR EACH COMMAND REGISTER .................................................... 42
Command Register - CR0 ................................................................................................................... 42
Command Register - CR1 ................................................................................................................... 43
Command Register - CR2 ................................................................................................................... 44
Command Register - CR3 ................................................................................................................... 44
Command Register - CR4 ................................................................................................................... 45
5.2 OPERATING THE MICROPROCESSOR SERIAL INTERFACE. ......................................................................... 45
Table 6:Loop-Back Modes................................................................................................................................ 45
Figure 33.Microprocessor Serial Interface Data Structure ............................................................................... 46
Figure 34. How to Interface the XRT7300 IC to the XRT7234/45 E3/DS3 ATM UNI IC .................................. 47
Figure 35.How to Interface the XRT7300 IC to the XRT7250 DS3/E3 Framer IC............................................ 48
ORDERING INFORMATION ..................................................................................................................... 49
Package Dimensions ....................................................................................................... 49


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