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Chapter6
WaveformAnalysis
Be
f
o
re
A
na
l
ys
i
s
Launch
i
ng
t
he
I
S
i
m
G
U
I
ToLaunch
t
he
G
U
I
TheISimGUIislaunchedwhenyourunthesimulationexecutable,eitherfromtheISE®software,orfromthe
commandline.Fordetails,seeStep3:SimulatingtheDesignfromtheStepsinSimulation.
TolaunchtheISimgraphicuserinterfaceinread-onlymodeinordertovieworanalyzethedatafromaprevious
simulation,seeOpeningaStaticSimulationformoreinformation.
Wha
tt
oExpec
t
SimulationfromISEsoftware
WhenyoulaunchISimfromtheISE®software,awaveconfigurationwithtop-levelsignalsisdisplayed.Design
dataispopulatedinotherareasoftheGUI,suchastheObjectspanel,andtheInstancesandProcessespanel.You
canthenproceedtoaddadditionalsignals,orrunthesimulationinISim.
SimulationattheCommandLine
WhenyoulaunchISimfromthecommandlinebyrunningthesimulationexecutablewiththe
-
gui
switch
(GraphicalUserInterfaceMode),anemptywaveconfigurationisdisplayed.Designdataispopulatedinother
areasoftheGUI,suchastheObjectsPanel,andtheInstancesandProcessespanel.Youmustaddsignalstothe
waveconfigurationbeforeyourunthesimulationinISim.
A
dd
i
ngS
i
gna
l
s
t
o
t
heWave
C
on
gu
ra
t
i
on
YoucanpopulatetheWavewindowwiththesignalsfromyourdesignusingmenucommandsordraganddrop
capabilitiesinthegraphicaluserinterface,orusingTclcommandsintheConsolepanel.
No
t
e
Changestothewaveconfiguration,includingcreatingthewaveconfigurationoraddingsignalstoit,do
notbecomepermanentuntilyousavetheWCFGfile.Formoreinformation,seeSavingtheResults.
I
n
t
he
G
U
I
1. IntheInstancesandProcessespanel,expandthedesignhierarchy,andselectanitem.
TheobjectsthatcorrespondtotheselectedinstanceorprocessdisplaysintheObjectspanel.
2. IntheObjectspanel,selectoneormoreobjects.
3. UseoneofthefollowingmethodstoaddobjectstotheWaveConfiguration:
Right-click,andselectAddtoWaveWindowfromthecontextmenu.
DraganddroptheobjectsfromtheObjectspaneltotheNamecolumnoftheWavewindow.
IntheConsole,usethewaveaddcommandasdescribedbelow.
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Chap
t
er 6
:
Wave
f
o
r
m
A
na
l
ys
i
s
Us
i
ngTc
l
1. Althoughoptional,youmaywishtofirstidentifytheobjectsyouwanttoaddbyexploringthedesign
hierarchyintheInstancesandProcessespanelandObjectspanel,asdescribedabove,orbyenteringthe
scopecommandintheConsolepanel.
2. IntheConsolepanel,enterthewaveaddcommandtoenteranindividualobjectoragroupofobjects.
A
dd
i
ng
C
op
i
eso
f
S
i
gna
l
so
rBuses
Youcanaddcopiesofthesamesignal/businawaveconfigurationforcomparingwaveforms.Copiesofthesame
signal/buscanbeplacedanywhereinthewaveconfiguration,suchasingroups,orvirtualbuses.
To
A
dda
C
opyo
f
aS
i
gna
l
o
rBus
1. SelectasignalorbusinthewaveconfigurationintheWavewindow.
2. SelectEdit>Copy,orpressCtrl+C.
Thesignalnameiscopiedtotheclipboard.
3. SelectPastecommandorCtrl+V.
Thesignal/busisnowcopiedtothewaveconfiguration. Youcanmovethesignal/bususingdraganddrop
asneeded.
Runn
i
ngaS
i
mu
l
a
t
i
on
i
n
I
S
i
m
Simulation,theprocessofverifyingthelogicandtimingofadesign,canberunfromISimusingfunctions
intheinterfaceoratthecommandline.
ToRunaS
i
mu
l
a
t
i
on
F
r
om
t
he
I
S
i
m
G
U
I
ThefollowingGUImenucommandscanbeusedtorunsimulation.
Simulation>Restart
-Stopssimulationandsetssimulationtimebackto0.UsetheRunAll,RunForor
Stepcommandtorunthesimulationoveragainwithoutreloadingthedesign.SeerestartTclcommand.
Simulation>RunAll
-Runssimulationuntilalleventsareexecuted.YoucanalsousetheRunTcl
commandwiththealloption.
Simulation>Run
-Runssimulationfor100nsorforspecifiedamountoftimeinthetoolbar.Timeand
timeunitareenteredintheValueboxinthetoolbar.YoucanalsousetherunTclcommandwithalength
andunitspecified.
Simulation>Step
-RunssimulationforoneexecutableHDLinstructionatatime. SeeSteppinga
Simulation. SeealsostepTclcommand.
Inaddition,youcanrunsimulationuntilaspecificpointinyourHDLsourcecodeisreached.Todoso,use
breakpointsandtheRunAllcommand. SeeSourceLevelDebuggingOverview.
No
t
e
Thecurrentsimulationtimeisdisplayedonthestatusbarinthelowerrightcorner.
S
t
opp
i
ngaS
i
mu
l
a
t
i
on
Whilerunningasimulationforanylengthoftime,youcanstopasimulationusingtheBreakcommand,which
leavesthesimulationsessionopen.
ToclosethesessionofISim,seeClosingISim.
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Chap
t
er6
:
Wave
f
o
r
m
A
na
l
ys
i
s
ToS
t
opaRunn
i
ngS
i
mu
l
a
t
i
on
YoucanstoparunningsimulationusingtheBreakcommandasfollows:
SelectSimulation>Break.
ClicktheBreaktoolbarbutton
.
EnterCtrl+Catthecommandlineonly.
ThesimulatorstopsatthenextexecutableHDLline.Thelineatwhichthesimulationstoppedisdisplayed
inthetexteditor.
No
t
e
Thisbehaviorappliestodesignsthathavenotbeencompiledwiththe
-
nodebug
switch.
ThesimulationcanberesumedatanytimebyusingtheRunAll,Run,orStepcommands.SeeRunninga
SimulationinISimfordetails.
C
l
os
i
ng
I
S
i
m
YoucanterminateasimulationandclosetheISimsession.
To
C
l
ose
I
S
i
m
• SelectFile>Exit.
• Enterthe
quit
-
f
commandintheConsolepanelattheprompt.
• ClicktheXatthetop-rightcornerofthemainwindow.
ThesimulationterminatesandthesessionofISimcloses.
C
us
t
om
i
z
i
ng
t
heWave
C
on
gu
ra
t
i
on
P
l
ac
i
ng
C
u
rso
rs
ThemaincursorandsecondarycursorintheWavewindowenableyoutodisplayandmeasuretime,andthey
formthefocalpointforvariousnavigationactivities.
ToP
l
ace
t
heMa
i
n
C
u
rso
r
WithasingleclickintheWavewindow,themaincursorisplacedatthelocationofthemouseclick.
ToP
l
ace
t
heSecondary
C
u
rso
r
Placethesecondarycursorasfollows:
Clickandholdthewaveform,anddrageitherleftorright.
Thissetsthesecondarycursor,withtheinitialclick,andthemaincursor,whenyoufinishdragging.
SelectShiftandclickthemouseinthewaveform.
Ifthesecondarycursorisnotalreadyon,thisactionsetsthesecondarycursortothepresentlocationofthe
maincursorandplacesthemaincursoratthelocationofthemouseclick.
No
t
e
Topreservethelocationofthesecondarycursorwhilepositioningthemaincursor,holdtheShift
keywhileclicking.
No
t
e
Whenplacingthesecondarycursorbydragging,youmustdragaminimumdistancebeforethesecondary
cursorwillappear.
ToMovea
C
u
rso
r
Acursorcanbemovedbyhoveringoverthecursoruntilyouseethegrabsymbol
,andclickinganddragging
thecursortothenewlocation.
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3
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Chap
t
er 6
:
Wave
f
o
r
m
A
na
l
ys
i
s
AsyoudragthecursorintheWavewindow,youwillseeaholloworfilled-incircleiftheSnaptoTransition
toolbarbuttonisselected,whichisthedefaultbehavior.
Afilled-incircle
indicatesthatyouarehoveringovertheselectedsignal’swaveformtransition.
Ahollowcircle
indicatesthatyouarehoveringbetweentransitionsintheselectedsignal’swaveform.
Se
tt
i
ngMarkers
A
dd
i
ngaMarker
Youcanaddoneormoremarkerstonavigatethroughthewaveform,andtodisplaythewaveformvalueata
particulartime.Markersareaddedtothewaveconfigurationatthelocationofthemaincursor.
To
A
ddaMarker
1. PlacethemaincursoratthetimewhereyouwanttoaddthemarkerbyclickingintheWavewindow
atthedesiredtimeoronthedesiredtransition.
2. SelectEdit>Markers>AddMarker,orclicktheAddMarkertoolbarbutton
.
Amarkerisplacedatthecursor,orslightlyoffsetifamarkeralreadyexistsatthelocationofthecursor. The
timeofthemarkerisdisplayedatthetopoftheline.
Mov
i
ngaMarker
Afteryouaddamarker,youcanmovethemarkertoanotherlocationinthewaveformusingthedragand
dropmethod.
ToMoveaMarker
1. Clickmarkerlabel(atthetopofthemarker)anddragittothedesiredlocation.
Thedragsymbol
indicatesthatthemarkercanbemovedaround.
AsyoudragthemarkerintheWavewindow,youwillseeaholloworfilled-incircleiftheSnapto
Transitiontoolbarbuttonisselected,whichisthedefaultbehavior.
Afilled-incircle
indicatesthatyouarehoveringoveratransitionoftheselectedsignal’swaveform
oroveranothermarker.Formarkers,thefilled-incircleiswhite.
Ahollowcircle
indicatesthatyouarehoveringbetweentransitionsintheselectedsignal’swaveform.
2. Releasethemousekeytodropthemarkertothenewlocation.
Themarkerismovedtothenewlocation.
D
e
l
e
t
i
ngaMarker
Youcandeleteoneorallmarkerswithonecommand.
To
D
e
l
e
t
eMarkers
1. Right-clickoveramarker.
2. Performoneofthefollowingfunctions:
SelectDeleteMarkerfromthecontextmenutodeleteasinglemarker.
SelectDeleteAllMarkersfromthecontextmenutodeleteallmarkers.
No
t
e
TheDeletekeycanalsobeusedtodeleteaselectedmarker.
Themarkerormarkersareremovedfromthewaveform.
Theundocommand(Edit>Undo)canbeusedtoreverseamarkerdeletion.
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Chap
t
er6
:
Wave
f
o
r
m
A
na
l
ys
i
s
A
dd
i
ng
D
i
v
i
ders
Youcanaddadividertoyourwaveconfigurationtocreateavisualseparatorofsignals.
To
A
dda
D
i
v
i
der
1. InaNamecolumnoftheWavewindow,clickasignalbelowwhichyouwishtoaddadivider.
2. SelectEdit>NewDivider,orright-clickandselectNewDividerfromthecontextmenu.
Adividerisaddedtothewaveconfiguration.ThechangeisvisualandnothingisaddedtotheHDLcode.
Thenewdividerwillbesavedwiththewaveconfigurationfilewhenthefileissavednext.
Followingchangescanbemadetoadivider:
Dividerscanbenamed. SeeRenamingObjects.
Dividerscanbemovedtoanotherlocationinthewaveform,bydragginganddroppingthedividername.
Todeleteadivider,highlightthedivider,andclicktheDeletekey,orright-clickandselectDeletefromthe
contextmenu.
A
dd
i
ng
G
r
oups
Youcanaddagrouptoyourwaveconfiguration,whichisacollection,or“folder”,towhichsignalsandbuses
canbeaddedinthewaveconfigurationasameansoforganizingasetofrelatedsignals.Thegroupitselfdisplays
nowaveformdatabutcanbeexpandedtoshowitscontentsorcollapsedtohidethem.
To
A
dda
G
r
oup
1. Inawaveconfiguration,selectoneormoresignalsorbusesyouwishtoaddtoagroup.
No
t
e
Agroupcanalsocomprisedividers,virtualbuses,andothergroups.
2. SelectEdit>NewGroup,orright-clickandselectNewGroupfromthecontextmenu.
Agroupthatcontainstheselectedsignalorbusisaddedtothewaveconfiguration.Agroupisrepresentedwith
the
icon. ThechangeisvisualandnothingisaddedtotheHDLcode.
Youcanmoveothersignalsorbusestothegroupbydragginganddroppingthesignal/busname.
Thenewgroupanditsnestedsignals/buseswillbesavedthenexttimeyousavethewaveconfigurationfile.
Followingchangescanbemadetoagroup:
Groupscanberenamed. SeeRenamingObjects.
GroupscanbemovedtoanotherlocationintheNamecolumnbydragginganddroppingthegroupname.
Toremoveagroup,highlightagroupandselectEdit>WaveObjects>Ungroup,orright-clickandselect
Ungroupfromthecontextmenu. Signals/busesformerlyinthegroupwillbeplacedatthetoplevelinthe
waveconfigurationhierarchy.
C
au
t
i
on!
TheDeletekeywillremovethegroupanditsnestedsignalsandbusesfromthewaveconfiguration.
A
dd
i
ngV
i
rt
ua
l
Buses
Youcanaddavirtualbustoyourwaveconfiguration,whichisagrouping,or“folder”,towhichlogicscalars
andarrayscanbeadded.Thevirtualbusdisplaysabuswaveform,whichiscomprisedofthesignalwaveforms
intheverticalorderthattheyappearunderthevirtualbus,flattenedtoaone-dimensionalarray.
To
A
ddaV
i
rt
ua
l
Bus
1. Inawaveconfiguration,selectoneormoresignalsorbusesyouwishtoaddtoavirtualbus.
2. SelectEdit>NewVirtualBus,orright-clickandselectNewVirtualBusfromthecontextmenu.
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Chap
t
er 6
:
Wave
f
o
r
m
A
na
l
ys
i
s
Avirtualbus,whichcontainstheselectedsignal(s)orbus(es),isaddedtothewaveconfiguration.Avirtualbus
isrepresentedwiththe
icon.ThechangeisvisualandnothingisaddedtotheHDLcode.
Youcanmoveothersignalsorbusestothevirtualbusbydragginganddroppingthesignal/busname.
Thenewvirtualbusanditsnestedsignals/buseswillbesavedthenexttimeyousavethewaveconfigurationfile.
Followingchangescanbemadetoavirtualbus:
Virtualbusescanberenamed. SeeRenamingObjects.
Movethevirtualbustoanotherlocationinthewaveformbydragginganddroppingthevirtualbusname.
Toremoveavirtualbus,andungroupitscontents,highlightthevirtualbus,andselectEdit>WaveObjects
>Ungroup,orright-clickandselectUngroupfromthecontextmenu.
C
au
t
i
on!
TheDeletekeywillremovethevirtualbusanditsnestedsignalsandbusesfromthewave
configuration.
Renam
i
ngOb
j
ec
t
s
YoucanrenameanyobjectintheWavewindow,suchassignals,dividers,groups,andvirtualbuses.
ToRenameanOb
j
ec
t
1. SelecttheobjectnameintheNamecolumn.
2. Rightclick,andselectRenamefromthecontextmenu.
3. Replacethenamewithanewone.
4. PressEnterorclickoutsidethenametomakethenamechangetakeeffect.
Youcanalsodouble-clicktheobjectnameandthenenteranewname.
Thechangeiseffectiveimmediately. Objectnamechangesinthewaveconfigurationdonotaffectthosein
thedesignsourcecode.
C
hang
i
ng
t
he
D
i
sp
l
ayNames
Youcandisplaythefullhierarchicalname(longname),thesimplesignal/busname(shortname),oracustom
nameforeachsignal.Thesignal/busnamedisplaysintheNamecolumnofthewaveconfiguration.
Ifthenameishidden:
ExpandtheNamecolumnuntilyouseetheentiresignalname.
UsethescrollbarintheNamecolumntoviewthename.
To
C
hange
t
he
D
i
sp
l
ayName
1. Selectoneormoresignalorbusnames.UseShift+clickorCtrl+clicktoselectmanysignalnames.
2. Right-click,andselectName>
Longtodisplaythefullhierarchicalname.
Shorttodisplaythenameofthesignalorbusonly.
Customtodisplaythecustomnamegiventothesignalwhenrenamed.SeeRenamingObjects.
Thenamechangesimmediatelyaccordingtoyourselection.
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Chap
t
er6
:
Wave
f
o
r
m
A
na
l
ys
i
s
C
hang
i
ng
t
heRad
i
x
ToSe
tt
he
D
e
f
au
l
t
Rad
i
x
Thedefaultradixcontrolsthebusradixdisplayedinthewaveconfiguration,Objectspanel,andtheConsole
panel. Tochangethedefaultradixfromthedefaultbinary:
1. SelectEdit>Preferences.
2. InthePreferencesdialogbox,clickISimSimulatorintheleftpane.
3. SelectaradixfromtheDefaultRadixfielddrop-downlist.
4. ClickApply,andclickOK.
To
C
hangean
I
nd
i
v
i
dua
l
Rad
i
x
Youcanchangetheradixofanindividualsignal(HDLobject)intheObjectpanelasfollows:
1. Right-clickonabusintheObjectspanel.
2. SelectRadix,andthedesiredformatfromsubmenumenu:
Binary
Hexadecimal
UnsignedDecimal
SignedDecimal
Octal
ASCII
No
t
e
ChangestotheradixofanitemintheObjectspaneldonotapplytovaluesintheWavewindoworthe
Consolepanel.Tochangetheradixofanindividualsignal(HDLobject)intheWavewindow,usetheWave
windowcontextmenu.TochangetheradixintheConsolepanel,usetheisimsetradixTclcommand.
Revers
i
ngBusB
i
t
O
r
der
YoucanreversethebusbitorderinthewaveconfigurationinordertoswitchbetweenMSB-firstandLSB-first
signalrepresentation.
ToReverseaBus
B
i
t
O
r
der
1. Selectabus.
2. RightclickandselectReverseBitOrder.
Thebusbitorderisreversed.TheReverseBitOrdercommandismarkedtoshowthatthisisthecurrentbehavior.
Nav
i
ga
t
i
ng
t
heWave
C
on
gu
ra
t
i
on
Expand
i
ngand
C
o
ll
aps
i
nga
Hi
erarchy
Youcanexpandandcollapseahierarchyinanywindoworpanelwithobjectsinnestedgroupsusingoneof
thefollowingmethods.
C
li
ck
i
ng
t
he
A
rr
ow
-Clickthearrowtoexpandthehierarchy. Onelevelcanbeexpandedatatime.
-Clickthearrowtocollapsethehierarchy.
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Chap
t
er 6
:
Wave
f
o
r
m
A
na
l
ys
i
s
Menu
C
ommand
1. Selectanobject.
2. SelectEdit>WaveObjects>
Expand-Expandsthehierarchyobjectthatisselected.Onelevelcanbeexpandedatatime.
Collapse-Collapsesthehierarchyoftheobjectselected.
Us
i
ng
t
he
C
on
t
ex
t
Menu
1. Selectanobject.
2. Rightclick,andselecttheapplicablecommandfromthecontextmenu
Expand-Expandsthehierarchyobjectthatisselected.Onelevelcanbeexpandedatatime.
Collapse-Collapsesthehierarchyoftheobjectselected.
Zoom
i
ng
I
nandOu
t
UsethezoomfunctionstoviewyourwaveconfigurationintheWavewindowasneeded.
Us
i
ng
C
ommands
Zoom
i
ngBehav
i
o
r
C
ommand
Sho
rt
cu
t
Key
Zoomin
SelectView>Zoom>In,orclickthe
ZoomIntoolbarbutton
.
PressF8.
PressCtrl,andinthewave
configuration,drawalinedownto
theleft.
No
t
e
Themiddle-mousebuttoncan
beusedinplaceoftheCtrlkey.
Zoomout
SelectView>Zoom>Out,orclickthe
ZoomOuttoolbarbutton
.
PressF7.
PressCtrl,andinthewave
configuration,drawalineupand
totheright.
No
t
e
Themiddle-mousebuttoncan
beusedinplaceoftheCtrlkey.
Zoomtodisplaytheentirewaveform
inthewindow
SelectView>Zoom>ToFullView,or
clicktheZoomtoFulltoolbarbutton
.
PressF6.
PressCtrl,andinthewave
configuration,drawalineupand
totheleft.
No
t
e
Themiddle-mousebuttoncan
beusedinplaceoftheCtrlkey.
Zoomtoanareayouselect
Notapplicable.
PressCtrl,anddrawaboxaroundan
areaofthewaveconfigurationfromthe
topleftcorneroftheareatothebottom
right.
No
t
e
Themiddle-mousebuttoncan
beusedinplaceoftheCtrlkey.
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Chap
t
er6
:
Wave
f
o
r
m
A
na
l
ys
i
s
Zoom
i
ngBehav
i
o
r
C
ommand
Sho
rt
cu
t
Key
Zoomtodisplaythetimerange
betweenthetwocursors
1. Placethecursorsinthewaveform.
2. SelectView>Zoom>ToCursors,
orclicktheZoomtoSelected
toolbarbutton
.
Notapplicable.
Us
i
ng
t
heM
i
dd
l
eMouseWhee
l
F
unc
t
i
on
C
ommand
Zoomsinandout
PressCtrlandmovetheMouseWheel
Scrollsleftandright
PressShiftandmovetheMouseWheel
Scrollsupanddown
MovetheMouseWheelonly
D
i
sp
l
ay
i
ng
t
he
Fl
oa
t
i
ngRu
l
er
Thefloatingrulerassistswithtimemeasurementsusingatimebaseotherthantheabsolutesimulationtime
shownonthestandardruleratthetopoftheWavewindow.Afloatingrulercanbedisplayed(orhidden)and
movedtothedesiredlocationintheWavewindow.Thefloatingruler’stimebase(time0)isthesecondarycursor,
or,ifthereisnosecondarycursor,theselectedmarker.Thefloatingrulerbuttonandthefloatingruleritselfare
visibleonlywhenthesecondarycursor(orselectedmarker)ispresent.
To
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Fl
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1. Either:
Placethesecondarycursor.
Or:
Selectamarker.
2. SelectView>FloatingRuler,orclicktheFloatingRulerbutton
.
Youonlyneedtofollowthisprocedurethefirsttime.Thefloatingrulerwillappeareachtimethesecondary
cursorisplacedormarkerisselected,asinstructedinStep1.
Thefloatingrulerdisplays.
Selectthecommandagaintohidethefloatingruler.
D
i
sp
l
ay
i
ngWave
f
o
r
mVa
l
uesW
i
t
hMarkers
Markers,whicharelinesthatintersectthewaveformataparticulartime,canbeusedtonavigatethroughthe
waveconfigurationandtodisplaythesignalandbusvaluesintheValuecolumnforeachmarker.Followthis
proceduretojumpthemaincursorfrommarkertomarkertodisplaywaveformvalues.
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6
9
Chap
t
er 6
:
Wave
f
o
r
m
A
na
l
ys
i
s
To
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sp
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ayWave
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mVa
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uesW
i
t
hMarkers
1. InthewaveconfigurationintheWavewindow,addoneormoremarkers,asdescribedinAddingaMarker.
Forasinglemarker,ifthemaincursorandmarkeroccupythesamelocation,theValuecolumndisplaysthe
signalandbusvalues. Nofurtheractionisrequired.
Formultiplemarkers,continue.
2. SelectEdit>Markers>NextMarker,orclicktheNextMarkertoolbarbutton
.
Thecursoradvancesthroughmarkersinthewaveconfiguration.
3. ObservethevaluesintheValuecolumnateachmarker.
4. SelectEdit>Markers>PreviousMarker,orclickthePreviousMarkertoolbarbutton
.
Thecursormovesbackwardthroughmarkersinthewaveconfiguration.
5. ObservethevaluesintheValuecolumnateachmarker.
D
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mVa
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uesa
t
S
i
gna
l
T
rans
i
t
i
ons
YoucanviewsignalvaluesateachtransitionofasignalinyourwaveformusingtheNextTransitionorPrevious
Transitioncommands. Thestartingpointisthemaincursor.
ToUseNex
t
andP
rev
i
ousT
rans
i
t
i
on
C
ommands
1. Selectasignal.
Thestartingpointisthelocationofthecursorinthewaveform.
2. Toadvancetothenexttransition,selectView>Cursors>NextTransitionorclicktheNextTransition
icon
.
Themarkeradvancestothenexttransitionfortheselectedsignal.Thevaluesforallsignalsatthattimeare
displayedintheValuecolumn.
3. Repeatstep2asnecessary.
4. Togobacktotheprevioustransition,selectView>Cursors>PreviousTransitionorclickthePrevious
Transitionicon
.
Themarkermovesbacktotheprevioustransitionfortheselectedsignal.Thevaluesforallsignalsatthat
timearedisplayedintheValuecolumn.
5. Repeatstep4asnecessary.
Thecursoradvancesormovesback,andthesignalvaluesareupdated.
Measu
r
i
ngT
i
mew
i
t
h
C
u
rso
rs
Together,themainandsecondarycursorsinthewaveconfigurationmeasurearangeoftime. Inadditionto
measuringtime,thetimerangealsoformsthefocalpointforzoomingtocursorsandprintingarange.
ToMeasu
reT
i
meW
i
t
h
C
u
rso
rs
Aquicktimemeasurementbetweenonetransitionandanother,possiblybetweentwodifferentsignal
waveforms,canbedonewiththefollowingprocedure.
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www.x
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nx.com
U
G
660(v11.
3
)
Sep
t
ember16,2
00
9
Documents you may be interested
Documents you may be interested