TABLE OF CONTENTS
DS21354 & DS21554
1 LIST OF FIGURES .......................................................................................................................5
2 LIST OF TABLES.........................................................................................................................6
3 INTRODUCTION .........................................................................................................................7
3.1 Functional Description...............................................................................................................8
3.2 Document Revision History.......................................................................................................9
4 PIN DESCRIPTION....................................................................................................................11
4.1 Pin Function Description .........................................................................................................15
4.1.1 Transmit Side Pins .........................................................................................................15
4.1.2 Receive Side Pins...........................................................................................................18
4.1.3 Parallel Control Port Pins...............................................................................................20
4.1.4 JTAG Test Access Port Pins ..........................................................................................22
4.1.5 Interleave Bus Operation Pins........................................................................................23
4.1.6 Line Interface Pins .........................................................................................................23
4.1.7 Supply Pins.....................................................................................................................24
5 PARALLEL PORT .....................................................................................................................24
5.1 Register Map............................................................................................................................25
6 CONTROL, ID, AND TEST REGISTERS...............................................................................29
6.1 Power-Up Sequence.................................................................................................................30
6.1.1 Synchronizatrion and Re-synchronization .....................................................................31
6.2 Framer Loopback.....................................................................................................................34
6.3 Automatic Alarm Generation...................................................................................................35
6.4 Remote Loopback ....................................................................................................................37
6.5 Local Loopback .......................................................................................................................34
7 STATUS AND INFORMATION REGISTERS .......................................................................39
7.1 CRC4 Sync Counter.................................................................................................................41
8 ERROR COUNT REGISTERS..................................................................................................44
8.1 BPV or Code Violation Counter..............................................................................................44
8.2 CRC4 Error Counter ................................................................................................................45
8.3 E-Bit Counter...........................................................................................................................45
8.4 FAS Error Counter...................................................................................................................46
9 DS0 MONITORING FUNCTION .............................................................................................46
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