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XRT7302IV

2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

Exar Corporation 

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2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

XRT7302

REV. 1.1.6

COMMAND REGISTER CR0-(N) ..................................................................................................... 39

COMMAND REGISTER CR2-(N) ..................................................................................................... 40

COMMAND REGISTER CR0-(N) ..................................................................................................... 40

COMMAND REGISTER CR2-(N) ..................................................................................................... 40

Muting the Recovered Data while the LOS is being Declared ........................................................... 40

COMMAND REGISTER CR3-(N) ..................................................................................................... 41

3.7 ROUTING THE RECOVERED TIMING AND DATA INFORMATION TO THE RECEIVING TERMINAL EQUIPMENT .

41

Routing Dual-Rail Format Data to the Receiving Terminal Equipment ............................................. 41

Figure 22.The typical interface for the Transmission of Data in a Dual-Rail Format from the Receive Section of

the XRT7302 to the Receiving Terminal Equipment ........................................................................ 41

Figure 23.How the XRT7302 outputs data on the RPOS and RNEG output pins .......................................... 42

Figure 24.The Behavior of the RPOS, RNEG and RxClk signals when RxClk is inverted ............................. 42

COMMAND REGISTER CR3-(N) ..................................................................................................... 43

Routing Single-Rail Format (Binary Data Stream) data to the Receive Terminal Equipment ........... 43

COMMAND REGISTER CR3-(N) ..................................................................................................... 43

Figure 25.The typical interface for Data Transmission in a Single-Rail Format from the Receive Section of the

XRT7302 to the Receiving Terminal Equipment .............................................................................. 43

Figure 26.The behavior of the RPOS and RxClk output signals while the XRT7302 is transmitting Single-Rail

data to the Receiving Terminal Equipment ...................................................................................... 44

3.8 SHUTTING OFF THE RECEIVE SECTION .......................................................................................... 44

COMMAND REGISTER CR3-(N) ..................................................................................................... 44

4.0 DIAGNOSTIC FEATURES OF THE XRT7302 .................................................................................. 45

4.1 THE ANALOG LOCAL LOOP-BACK MODE ......................................................................................... 45

Figure 27. A channel in the XRT7302 operating in the Analog Local Loop-Back Mode ................................. 45

COMMAND REGISTER CR4-(N) ..................................................................................................... 45

4.2 THE DIGITAL LOCAL LOOP-BACK MODE. ......................................................................................... 46

Figure 28.The Digital Local Loop-Back path in a given channel of the XRT7302 .......................................... 46

COMMAND REGISTER CR4-(N) ..................................................................................................... 46

4.3 THE REMOTE LOOP-BACK MODE ................................................................................................... 47

Figure 29.The Remote Loop-Back path in a given XRT7302 Channel .......................................................... 47

COMMAND REGISTER CR4-(n) ..................................................................................................... 47

4.4 TXOFF FEATURES ......................................................................................................................... 47

COMMAND REGISTER CR1-(N) ..................................................................................................... 48

Table 6:The Relationship Between the TxOFF Input Pin, the TxOFF Bit Field and the State of the Transmitter

48

4.5 THE TRANSMIT DRIVE MONITOR FEATURES .................................................................................... 48

Figure 30.The XRT7302 employing the Transmit Drive Monitor Features ..................................................... 49

4.6 THE TAOS (TRANSMIT ALL ONES) FEATURE ................................................................................. 49

5.0 THE MICROPROCESSOR SERIAL INTERFACE ............................................................................ 49

5.1 DESCRIPTION OF THE COMMAND REGISTERS .................................................................................. 49

COMMAND REGISTER CR1-(N) ..................................................................................................... 49

Table 7:Addresses and Bit Formats of XRT7302 Command Registers ......................................................... 50

5.2 DESCRIPTION OF BIT-FIELDS FOR EACH COMMAND REGISTER ......................................................... 50

III

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