Table of Contents
FEATURES.............................................................................................................................................................................. 7
HIGHLIGHTS.................................................................................................................................................................................................... 7
MAIN FEATURES ............................................................................................................................................................................................ 7
OTHER FEATURES......................................................................................................................................................................................... 7
APPLICATIONS....................................................................................................................................................................... 7
DESCRIPTION......................................................................................................................................................................... 8
FUNCTIONAL BLOCK DIAGRAM.......................................................................................................................................... 9
1 PIN ASSIGNMENT ........................................................................................................................................................... 10
2 PIN DESCRIPTION .......................................................................................................................................................... 11
3 FUNCTIONAL DESCRIPTION ......................................................................................................................................... 15
3.1 RESET ........................................................................................................................................................................................................... 15
3.2 MASTER CLOCK .......................................................................................................................................................................................... 15
3.3 INPUT CLOCKS & FRAME SYNC SIGNALS ............................................................................................................................................... 16
3.3.1 Input Clocks .................................................................................................................................................................................... 16
3.3.2 Frame SYNC Input Signals ............................................................................................................................................................ 16
3.4 INPUT CLOCK PRE-DIVIDER ...................................................................................................................................................................... 17
3.5 INPUT CLOCK QUALITY MONITORING ..................................................................................................................................................... 19
3.5.1 Activity Monitoring ......................................................................................................................................................................... 19
3.5.2 Frequency Monitoring ................................................................................................................................................................... 20
3.6 DPLL INPUT CLOCK SELECTION .............................................................................................................................................................. 21
3.6.1 External Fast Selection .................................................................................................................................................................. 21
3.6.2 Forced Selection ............................................................................................................................................................................ 22
3.6.3 Automatic Selection ....................................................................................................................................................................... 22
3.7 SELECTED INPUT CLOCK MONITORING .................................................................................................................................................. 23
3.7.1 DPLL Locking Detection ................................................................................................................................................................ 23
3.7.1.1 Fast Loss .......................................................................................................................................................................... 23
3.7.1.2 Coarse Phase Loss .......................................................................................................................................................... 23
3.7.1.3 Fine Phase Loss ............................................................................................................................................................... 23
3.7.1.4 Hard Limit Exceeding ....................................................................................................................................................... 23
3.7.2 Locking Status ............................................................................................................................................................................... 23
3.7.3 Phase Lock Alarm .......................................................................................................................................................................... 23
3.8 SELECTED INPUT CLOCK SWITCH ........................................................................................................................................................... 25
3.8.1 Input Clock Validity ........................................................................................................................................................................ 25
3.8.2 Selected Input Clock Switch ......................................................................................................................................................... 25
3.8.2.1 Revertive Switch ............................................................................................................................................................... 25
3.8.2.2 Non-Revertive Switch ....................................................................................................................................................... 25
3.8.3 Selected / Qualified Input Clocks Indication ................................................................................................................................ 25
3.9 SELECTED INPUT CLOCK STATUS VS. DPLL OPERATING MODE ....................................................................................................... 27
3.10 DPLL OPERATING MODE ........................................................................................................................................................................... 29
3.10.1 Six Operating Modes ..................................................................................................................................................................... 29
3.10.1.1 Free-Run Mode ................................................................................................................................................................ 29
3.10.1.2 Pre-Locked Mode ............................................................................................................................................................. 29
3.10.1.3 Locked Mode .................................................................................................................................................................... 29
3.10.1.3.1 Temp-Holdover Mode .................................................................................................................................... 29
3.10.1.4 Lost-Phase Mode ............................................................................................................................................................. 29
3.10.1.5 Holdover Mode ................................................................................................................................................................. 29
Table of Contents
3
August 21, 2007
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