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4.12.19VideoDisplayField2VerticalSynchronizationStartRegister(VDVSYNS2)
4.12.20VideoDisplayField2VerticalSynchronizationEndRegister(VDVSYNE2)
VideoDisplayRegisters
Table4-23.VideoDisplayField1VerticalSynchronizationEndRegister(VDVSYNE1)FieldDescriptions
(continued)
Bitfield
(1)
symval
(1)
ValueDescription
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
11-0VSYNCXSTOP1OF(value)0-FFFhSpecifiesthepixelwhereVSYNCisde-assertedinfield1.
DEFAULT0
Thevideodisplayfield2verticalsynchronizationstartregister(VDVSYNS2)controlsthestartofvertical
synchronizationinfield2.TheVDVSYNS2isshowninFigure4-49anddescribedinTable4-24.
GenerationoftheverticalsynchronizationisshowninFigure4-6.TheVSYNCsignalisasserted
whenevertheframelinecounter(FLCOUNT)isequaltoVSYNCYSTART2andtheframepixelcounter
(FPCOUNT)isequaltoVSYNCXSTART2.
Figure4-49.VideoDisplayField2VerticalSynchronizationStartRegister(VDVSYNS2)
31282716
ReservedVSYNCYSTART2
R-0R/W-0
1512110
ReservedVSYNCXSTART2
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table4-24.VideoDisplayField2VerticalSynchronizationStartRegister(VDVSYNS2)Field
Descriptions
Bitfield
(1)
symval
(1)
ValueDescription
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
27-16VSYNCYSTART2OF(value)0-FFFhSpecifiesthelinewhereVSYNCisassertedforfield2.
DEFAULT0
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
11-0VSYNCXSTART2OF(value)0-FFFhSpecifiesthepixelwhereVSYNCisassertedinfield2.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_VDVSYNS2_field_symval
Thevideodisplayfield2verticalsynchronizationendregister(VDVSYNE2)controlstheendofvertical
synchronizationinfield2.TheVDVSYNE2isshowninFigure4-50anddescribedinTable4-25.
GenerationoftheverticalsynchronizationisshowninFigure4-6.TheVSYNCsignalisde-asserted
whenevertheframelinecounter(FLCOUNT)isequaltoVSYNCYSTOP2andtheframepixelcounter
(FPCOUNT)isequaltoVSYNCXSTOP2.
Thevideodisplayfield2verticalsynchronizationendregister(VDVSYNE2)isshowninFigure4-50and
describedinTable4-25.
VideoDisplayPort 140SPRUEM1–May2007
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