參數(shù)資料
型號: SM3E-19.44M
廠商: Connor-Winfield
文件頁數(shù): 22/36頁
文件大?。?/td> 0K
描述: IC MOD TIMING 19.440MHZ STRAT 3E
標準包裝: 1
系列: SM3
類型: 定時模塊,系統(tǒng)時鐘
PLL:
主要目的: 以太網(wǎng),ADM,DSLAM,SONET/SDH,Stratum,TDM
輸入: LVCMOS
輸出: LVCMOS
電路數(shù): 1
比率 - 輸入:輸出: 8:3
差分 - 輸入:輸出: 無/無
頻率 - 最大: 19.44MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: 0°C ~ 70°C
安裝類型: 通孔
封裝/外殼: 32-DIP 模塊
包裝: 管件
其它名稱: CW643
SM3E 19.44M
SM3E19.44M
SM3E Data Sheet #:
TM054
Page 29 of 36 Rev: 04 Date: 01/26/11
Copyright 2011 The Connor-Winfield Corp. All Rights Reserved
Specifications subject to change without notice
Phase Build-out Operation
General:Themodule,whenlockedtoareferencemaintainsafixedphaserelationshipbetweenitsinputandoutputsignals.Thephase
detectorusedinthePLLdeterminesthisrelationship.Typically,thePLLwouldrecognizeaphasechangeintheinputreferenceand
adjusttheoscillatorcontroltomaintainthesameinputoutputrelationship.ThePLLcanbeprogrammedtoignoretheinputphase
changeandtherebycreateanewphaserelationshipbetweentheinputandtheoutputsignals.Thisisparticularlyusefulinsome
applicationswhereitisnotdesirabletopassphasehitsontheinputsthroughtotheoutputs.Thisprocessoflimitingorabsorbinga
phasehitisknownas“PhaseBuildOut”.
Requirements:Amodulethatsupportsphasebuild-outshouldmeetthefollowingrequirementsspecifiedinGR-1244,section5-7.
R5-15“Inputphase-timechangesof3.5usorgreateroveranintervaloflessthan0.1secondsorlessshallbebuilt-outbystratum2
and3Eclockstoreducetheresultingclockphase-timechangetolessthan50ns.
Phase-timechangesof1.0usorlessoveranintervalof0.1secondsshallnotbebuilt-out.”
R5-16“Stratum3,4Eand4clocksshallnotperformphasebuild-out.”
“Basedontheaboverequirement,phase-timechangesofmorethan1.0usbutlessthan3.5usthatoccuroveranintervaloflessthan
0.1secondsmayormaynotbebuilt-out”.
Themoduleshouldnotshowanyalarmsduringthephasebuild-outoperation.Alsothemoduleshouldbecapableoftolerating5to10
UIofjitteratDS1rate(3.2to6.4us)andnotperformanyphasebuild-out.
ModuleSetup:Themodule,bydefault,doesnothavephasebuild-outenabled.Itcanbeenabledbysettingthe“PHASEBUILD-OUT
OPTION”bit,whichisbit4ofBANDWIDTH_PBOregister(0x03).
Note:Phasebuild-outisnotthesameas“HitlessReferenceSwitching”eventhoughtheyaresimilarinimplementation.Whilephase
build-outisimplementedinstratum3Etimingmodulesandhigher,hitlessreferenceswitchingcanbeimplementedinanystratumlevel
timingmodulethatacceptstwoormorereferenceinputs.Also,phasebuild-outcanbeusedonlytobuild-outphasehitsthatexceed1
us,hitlessreferenceswitchinghasnosuchlimits.
Application Notes continued
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