
DS21354 & DS21554
2 of 117
TABLE OF CONTENTS
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