LXT6282
Contents
1.0
2.0
Pin Assignments and Signal Descriptions....................................................10
General Functional Description .........................................................................15
2.1
2.2
Introduction..........................................................................................................15
Transmitter Description .......................................................................................15
2.2.1 Dejitter Mode..........................................................................................15
2.2.2 Retiming Mode .......................................................................................16
2.2.3 Pass-Through Mode...............................................................................16
Receive Data Flow Description ...........................................................................16
2.3
3.0
Functional Description Per E1 Channel..........................................................18
3.1
Transmitter Default Operation.............................................................................18
3.1.1 Data Input Interface................................................................................18
3.1.2 Frame Alignment....................................................................................18
3.1.3 CRC-4 Multiframe Alignment..................................................................18
3.1.4 AIS Detection .........................................................................................20
3.1.5 CRC-4 Multiframe Monitoring.................................................................20
3.1.5.1 CRC-4 Block Errors Calculation ................................................20
3.1.5.2 Remote End Block Errors..........................................................20
3.1.5.3 Remote Alarm ...........................................................................20
3.1.6 Retiming Elastic Store Operation ...........................................................20
3.1.7 De-jittering Circuitry................................................................................23
3.1.8 AIS Signal Insertion................................................................................23
3.1.9 Line Coding HDB3..................................................................................23
3.1.10 Receiver Operation ................................................................................24
3.1.10.1Line decoding HDB3 .................................................................24
3.1.10.2AIS Detection ............................................................................24
3.1.10.3AIS Insert/LOS Alarm filtering ...................................................25
3.1.10.4Frame Alignment/Out Of Frame Alarm......................................25
3.1.10.5CRC-4 Multiframe Alignment/Out of CRC Multiframe Alarm.....25
3.1.10.6CRC-4 Multiframe Monitoring....................................................25
3.1.10.7Test Pattern Generator for Autotesting/Maintenance................26
3.1.11 MICROCONTROLLER INTERFACE .....................................................26
3.1.11.1Intel Interface.............................................................................26
3.1.11.2Motorola Interface .....................................................................27
3.1.12 Iinterrupt Handling..................................................................................27
3.1.12.1Interrupt Sources.......................................................................27
3.1.12.2Interrupt Enables.......................................................................27
3.1.12.3Interrupt Clearing.......................................................................28
3.1.12.4Status Registers Access ...........................................................28
3.1.12.5Counter Reading .......................................................................28
4.0
Microprocessor Register Description..............................................................29
4.1
Global Registers..................................................................................................30
4.1.1 GLOB_CONF0 - Global Operational Configuration 0 (0FH) ..................30
4.1.2 GLOB_CONF1- Global Operational Configuration 1 (1FH) ...................31
4.1.3 IND_XMTE1_CHN - Individual Transmit E1 Channel Interrupt (2FH)....32
4.1.4 IND_RCVE1_CHN - Individual Receive E1 Channel Interrupt (3FH).....32
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