ACS8510 Rev2.1 SETS
FINAL
ADVANCED COMMUNICATIONS
Table of Contents
List of Sections
Description ................................................................................................................................................................................................ 1
Block Diagram........................................................................................................................................................................................... 1
Features ..................................................................................................................................................................................................... 1
Table of Contents ...................................................................................................................................................................................... 2
Pin Diagram ............................................................................................................................................................................................... 5
Pin Descriptions ........................................................................................................................................................................................ 6
Functional Description ............................................................................................................................................................................. 9
Local Oscillator Clock ................................................................................................................................................................................... 10
ITU and ETSI Specification ............................................................................................................................................................. 10
Telcordia GR-1244 CORE Specification ....................................................................................................................................... 10
Crystal Frequency Calibration ...................................................................................................................................................... 10
Input Interfaces ............................................................................................................................................................................................. 10
Over-Voltage Protection .............................................................................................................................................................................. 10
Input Reference Clock Ports ....................................................................................................................................................................... 11
Input Wander and Jitter Tolerance .............................................................................................................................................................. 9
Output Clock Ports ........................................................................................................................................................................................ 12
Low Speed Output Clock (DPLL2) ................................................................................................................................................. 12
High Speed Output Clock (DPLL1) ............................................................................................................................................... 12
Frame Sync and Multi-Frame Sync Clocks (Part of DPLL1) ................................................................................................... 13
Low Jitter Multiple E1/DS1 Outputs ........................................................................................................................................... 13
Output Wander and Jitter ............................................................................................................................................................................ 13
Phase Variation ............................................................................................................................................................................................. 18
Phase Build Out ............................................................................................................................................................................................. 21
Microprocessor Interface............................................................................................................................................................................. 21
Motorola Mode ................................................................................................................................................................................ 21
Intel Mode ........................................................................................................................................................................................ 21
Multiplexed Mode ........................................................................................................................................................................... 21
Serial Mode ...................................................................................................................................................................................... 21
EPROM Mode ................................................................................................................................................................................... 21
Register Set ..................................................................................................................................................................................... 22
Configuration Registers ................................................................................................................................................................. 22
Status Registers .............................................................................................................................................................................. 22
Register Access ............................................................................................................................................................................... 22
Interrupt Enable and Clear ......................................................................................................................................................................... 22
Register Map .................................................................................................................................................................................................. 23
Register Map Description ........................................................................................................................................................................... 27
Selection of Input Reference Clock Source ............................................................................................................................................. 36
Forced Control Selection ............................................................................................................................................................... 37
Automatic Control Selection ........................................................................................................................................................ 37
Ultra Fast Switching ....................................................................................................................................................................... 37
External Protection Switching ..................................................................................................................................................... 38
Clock Quality Monitoring ............................................................................................................................................................................. 38
Activity Monitoring ....................................................................................................................................................................................... 39
Frequency Monitoring .................................................................................................................................................................................. 39
Modes of Operation ...................................................................................................................................................................................... 41
Free-run mode ................................................................................................................................................................................. 41
Pre-Locked mode ............................................................................................................................................................................ 41
Locked mode .................................................................................................................................................................................... 41
Lost_Phase mode ........................................................................................................................................................................... 41
Holdover mode ................................................................................................................................................................................ 42
Pre-Locked(2) mode........................................................................................................................................................................ 42
Protection Facility ........................................................................................................................................................................................ 43
Alignment of Priority Tables in Master and Slave ACS8510 ................................................................................................. 44
Alignment of the Selection of Reference Sources for TOUT4 Generation in the Master and Slave ACS8510........... 45
Alignment of the Phases of the 8kHz and 2kHz Clocks in both Master and Slave ACS8510 ....................................... 45
JTAG .................................................................................................................................................................................................................. 45
PORB ................................................................................................................................................................................................................ 45
Electrical Specification.......................................................................................................................................................................... 48
Revision 2.00/September 2003 Semtech Corp.
2
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