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SM3-8RG5 Fiches technique(PDF) 9 Page - Connor-Winfield Corporation

No de pièce SM3-8RG5
Description  8 REFERENCE STRATUM 3 MODULE
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Fabricant  CONNOR-WINFIELD [Connor-Winfield Corporation]
Site Internet  http://www.conwin.com
Logo CONNOR-WINFIELD - Connor-Winfield Corporation

SM3-8RG5 Fiches technique(HTML) 9 Page - Connor-Winfield Corporation

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SM3-8RG5 Data Sheet #:
TM088
Page 9 of 32
Rev:
07 Date: 09/06/11
© Copyright 2011 The Connor-Winfield Corp. All Rights Reserved
Specifications subject to change without notice
Reference Input Quality Monitoring
Eachreferenceinputismonitoredforsignalpresenceandfrequencyoffset.Signalpresenceforthe
Ref1-8inputsisindicatedin
the
Ref_ActivityregisterandsignalpresencefortheM/S REFisindicatedinbit0oftheM/S REF_Activityregister.Thefrequency
offsetbetweenthe
Ref1-8inputsandthecalibratedlocaloscillatorisavailableintheRef_Frq_Offsetregisters(8).RegisterRef_
Pullin_Stsindicates,foreachoftheRef1-8inputs,ifthereferenceiswithinthemaximumpull-inrange.Themaximumpull-inrange
isindicatedinregister
Max_Pullin_Range,andmaybesetin0.1ppmincrements.Typically,itwouldbesetaccordingtothevalues
specifiedbythestandards(GR-1244)appropriatefortheparticularstratumofoperation.
The
Ref_Qualifiedregistercontainsthe“anded”conditionoftheRef_ActivityandRef_Pullin_StsregistersforeachoftheRef1-8
inputs,qualifiedfor10seconds.Whenareferencesignalhasbeenpresentfor>10secondsandiswithinthepull-inrange,it’sbitis
set.
The
Ref_Availableregistercontainsthe“anded”conditionoftheRef_QualifiedregisterandtheRef_Maskregister,andtherefore
representstheavailabilityofareferenceforselectionwhenautomaticreferenceandoperationalmodeselectionisenabled.
Reference Input Selection, Frequencies, and Mode Selection
Oneofeightreferenceinputsignals(
Ref 1-8)areselectedforsynchronizationinMastermode(asbelowintheOp_Moderegister
description.0x05).
Ref 1-8mayeachbe8kHz,1.544MHz,2.048MHz,12.96MHz,19.44MHz,25.92MHz,38.88MHz,51.84MHz
or77.76MHz.
Referencefrequenciesareauto-detectedandthedetectedfrequencycanbereadfromthe
Ref_Frq_Priority registers(See
Register Descriptions and Operationsection).
Activereferenceandoperationalmodeselectionmaybemanualorautomatic,asdeterminedbybit1inthe
Ctl_Moderegister.In
manualmode,registerwritesto
Op_Modeselectthereferenceandmode.Theresetdefaultismanualmode.
TheM/SREFinputforslaveoperationisfrequencyauto-detectedandmaybe8kHz,1.544MHz,2.048MHz,12.96MHz,19.44MHz,
25.92MHz,38.88MHz,51.84MHzor77.76MHz.SignalpresenceandfrequencyfortheM/SREFinputisindicatedinbits0-3ofthe
M/S REF_Activityregister.
Inautomaticmode,thereferenceisselectedaccordingtotheprioritieswrittentotheeight
Ref_Frq_Priorityregisters.Individual
referencesmaybemaskedforuse/non-useaccordingtothe
Ref_Maskregister.Areferencemayonlybeselectedifitis“available”
-thatis,itisqualified,asindicatedinthe
Ref_Qualified register,andisnotmasked(SeeReference Input Quality Monitoring and
Register Descriptions and Operation sections).
Furthermore,Bit3ofeach
Ref_Frq_Priority registerwilldetermineifthatreferenceisrevertiveornon-revertive.Whenareference
fails,thenexthighestpriority“available”(signalpresent,non-masked,andacceptablefrequencyoffset)referencewillbeselected.
Whenareferencereturns,itwillbeswitchedtoonlyifitisofhigherpriorityandthecurrentactivereferenceismarked“Revertive”.
Additionally,thereversionisdelayedaccordingtothevaluewrittentothe
Ref_Rev_Delayregister(From0to255minutes).
Detailed Description continued
Serial Interface Timing
Table 4
Symbol
Parameter
Minimum
Nominal
Maximum
Units
Notes
t
CS
SPI_EnablelowtoSPI_CLKlow
15
-
-
ns
t
CH
SPI_CLKhightime
25
-
-
ns
t
CL
SPI_CLKlowtime
25
-
-
ns
t
RWs
Read/Writesetuptime
15
-
-
ns
t
RWh
Read/Writeholdtime
15
-
-
ns
t
DRDY
Dataready
-
-
25
ns
t
HLD
DataHold
15
-
-
ns
t
CSTRI
ChipSelecttodatatri-state
5
-
-
ns
t
CSMIN
Minimumdelaybetweensuccessiveaccesses 300
-
-
ns


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