DS2154
TABLE OF CONTENTS
1 DETAILED DESCRIPTION....................................................................................................6
1.1
INTRODUCTION .............................................................................................................................6
New Features......................................................................................................................................... 6
FUNCTIONAL DESCRIPTION ...........................................................................................................7
READER’S NOTE...........................................................................................................................7
1.1.1
1.2
1.3
2 PIN DESCRIPTION................................................................................................................9
2.1
2.2
2.3
2.4
2.5
TRANSMIT SIDE DIGITAL PINS......................................................................................................11
RECEIVE SIDE DIGITAL PINS........................................................................................................12
PARALLEL CONTROL PORT PINS .................................................................................................13
LINE INTERFACE PINS .................................................................................................................14
SUPPLY PINS..............................................................................................................................14
3 PARALLEL PORT...............................................................................................................20
4 CONTROL, ID, AND TEST REGISTERS ............................................................................20
4.1
4.2
4.3
4.4
4.5
FRAMER LOOPBACK....................................................................................................................29
LOCAL LOOPBACK.......................................................................................................................29
REMOTE LOOPBACK....................................................................................................................29
POWER-UP SEQUENCE...............................................................................................................30
AUTOMATIC ALARM GENERATION................................................................................................30
5 STATUS AND INFORMATION REGISTERS......................................................................31
5.1
CRC4 SYNC COUNTER...............................................................................................................33
6 ERROR COUNT REGISTERS.............................................................................................39
6.1
6.2
6.3
6.4
BPV OR CODE VIOLATION COUNTER...........................................................................................39
CRC4 ERROR COUNTER ............................................................................................................40
E-BIT COUNTER .........................................................................................................................40
FAS ERROR COUNTER ...............................................................................................................41
7 DS0 MONITORING FUNCTION ..........................................................................................42
8 SIGNALING OPERATION...................................................................................................46
8.1
8.2
PROCESSOR-BASED SIGNALING..................................................................................................46
HARDWARE-BASED SIGNALING ...................................................................................................49
Receive Side........................................................................................................................................ 49
Transmit Side....................................................................................................................................... 49
8.2.1
8.2.2
9 PER-CHANNEL CODE (IDLE) GENERATION AND LOOPBACK .....................................51
9.1
9.1.1
9.1.2
9.2
TRANSMIT SIDE CODE GENERATION............................................................................................51
Simple Idle Code Insertion and Per-Channel Loopback...................................................................... 51
Per-Channel Code Insertion ................................................................................................................ 52
RECEIVE SIDE CODE GENERATION..............................................................................................53
10
11
CLOCK BLOCKING REGISTERS..................................................................................55
ELASTIC STORES OPERATION...................................................................................57
11.1
RECEIVE SIDE ............................................................................................................................57
11.2
TRANSMIT SIDE ..........................................................................................................................57
12
ADDITIONAL (Sa) AND INTERNATIONAL (Si) BIT OPERATION................................58
12.1
12.2
12.3
HARDWARE SCHEME ..................................................................................................................58
INTERNAL REGISTER SCHEME BASED ON DOUBLE-FRAME ...........................................................58
INTERNAL REGISTER SCHEME BASED ON CRC4 MULTIFRAME .....................................................61
2 of 87
ROCHESTER [ Rochester Electronics ]
