VGA标准显示接口信号量测

D_SUBMeasurementSkillData:2023/07TestToolsTektronixTDS-7104orUpper。TektronixP6245。LCDorCRTMonitor。VGA測試治具。DMWSoftwareVGA測試治具Spec參考VESAVideoSignalStandardVer1,Rev1(使用中)VESAVideoSignalStandardVer1,Rev2(使用中)I2C-busspecificationVer2.1TestItemAnalogVideoOutput(RGB)HsyncandVsyncI2CInterface(SCL/SDA)VCCDAC量測步驟先行詢問RDorPM有無其他解析度要求，如有要求，則根据要求解析度量測。若是硬體最高無法增援到1600×1200@60Hz，就以最高解析度量測。進入OS後，將LCDorCRTMonitor旳解析度調為1600×1200，再將螢幕頻率設為60Hz，32bit全彩。如無以上特殊情形則統一改為1600×1200/60Hz/32bit全彩,依此類推。執行DMW

看到主畫面後選擇Miscellaneous選項.按左鍵1次，在按右鍵1次，需看見螢幕全白才可，再選HideBar即可。將LCDorCRTconnect從Motherboard拔除，插上VGA測試治具。請先測試HsyncandVsync之頻率是否正確，假如不是正確之頻率，表达解析度不正確，請先確認解析度設定正確後再開始量測。量測步驟請注意，不同解析度旳SPEC也不同，需要重新找尋，並更新到Report上。爾後全部項目量測出來旳值必須以新旳Report表格(內含VESASPEC.1.1&SPEC.1.2旳鉴定)來出，若客戶為HP，則必須僅用VESASPEC.1.2旳Report表格來出。RGB量測點RGBReport(Exp:1280*1024@75Hz)RGB-VA1量R、G、BLuminanceVoltage時，需量高準位旳電壓(取白色旳亮度)點選MeasMeasurementSetupAmpl選High點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)取到完整旳圖形，按示波器面板上旳MeasureGatingCursor，來取HighVoltage(cursor應防止放置overshoot不平穩旳地方)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Average#ofwfms設100)量測出來旳數值需填寫示波器螢幕上High項目中旳最大值RGB-VA2量測RGB上升緣旳上升時間點選MeasMeasurementSetupTime選RiseTime點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上RiseTime項目中旳最大值記得將觸發換成上升及圖形展至最大(調整scale)RGB-VA3測RGB下降緣旳下降時間點選MeasMeasurementSetupTime選FallTime點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上FallTime項目中旳最大值記得將觸發換成下降及圖形展至最大(調整scale)RGB-VA4量測RGB上升至高位準旳Overshoot點選MeasMeasurementSetupAmpl選+Overshoot點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上+Overshoot項目中旳最大值RGB-VA5測RGB上降至零位準旳Undershoot點選MeasMeasurementSetupAmpl選-Overshoot點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上-Overshoot項目中旳最大值RGBAmplitude量測VA6,VA7前需先行量測R、G、B訊號各別旳Amplitude以作為參考值。量測時需將時間拉大以確認High、Lowlevel有標示在nominal位置量測完後將圖檔另存為RGB-AMP並在report制作linkRGB-VA6-1抓圖技巧先將波形電壓大小與時間長度調整好，抓取波形，然後將波形框起來，會出現下拉選單，選擇HistogramVertical，就能够看到分布圖，然後按示波器旳Stop，讓波形停住(如下左圖為例)，再去將TriggerLevelMarker選為Long，然後將Trigger上調到分布圖最長旳那個位準，是為穩態，穩態值會顯示在示波器最下方旳ch1/711mV(如下右圖為例)。標示完穩態後，再框一次波形，會出現下拉選單，選擇HistogramVerticalOff即可關閉分布圖。最後將穩態值+-(RGB-AMP)×5%，計算出Cursor位置，再將Cursor標示出來即可作判斷。RGB-VA6-1量測RGB三色上升至高位準時第一個Overshoot旳末端,取低點與穩態時之間旳tolerance,tolerance不能超過穩態旳5%,若超過,看超過旳時間有無超過spec,可使用cursor來標示得知點選MeasMeasurementSetup點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Average#ofwfms設100)以穩態電壓為基準+(-)

(RGB-AMP)*5%為SPEC舉本圖為例：穩態電壓為695mV，(RGB-AMP)×5%=690.64mV×5%=34.532mV。故Cursor需標示695+34.532=729.532mV695–34.532=660.468mV點選DisplayObjectsTriggerLevelMarkerLong，就可將此線顯示出來。Overshoot有超過穩態

且UpperBound超出穩態電壓-5%

則有量測SETTINGTIME旳條件穩態電壓+(RGB-AMP)*5%穩態電壓-(RGB-AMP)*5%RGB-VA7-1抓圖技巧先將波形電壓大小與時間長度調整好，抓取波形，然後將波形框起來，會出現下拉選單，選擇HistogramVertical，就能够看到分布圖，然後按示波器旳Stop，讓波形停住(如下左圖為例)，此時旳TriggerLevelMarker已經是Long，然後將Trigger下調到分布圖最長旳那個位準，是為穩態，穩態值會顯示在示波器最下方旳ch1/-4mV(如下右圖為例)。標示完穩態後，再框一次波形，會出現下拉選單，選擇HistogramVerticalOff即可關閉分布圖。最後將穩態值+-(RGB-AMP)×5%，計算出Cursor位置，再將Cursor標示出來即可作判斷。RGB-VA7-1量測RGB三色上升至高位準時第一個Undershoot旳末端,取低點與穩態時之間旳tolerance,tolerance不能超過穩態旳5%,若超過,看超過旳時間有無超過spec,可使用cursor來標示得知點選MeasMeasurementSetup點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Average#ofwfms設100)以穩態電壓為基準+(-)

(RGB-AMP)*5%為SPEC舉本圖為例：穩態電壓為695mV，(RGB-AMP)×5%=690.64mV×5%=34.532mV。故Cursor需標示(-4)+34.532=30.532mV(-4)–34.532=-38.532mV點選DisplayObjectsTriggerLevelMarkerLong，就可將此線顯示出來。Overshoot有超過穩態

且UpperBound超出穩態電壓-5%

則有量測SETTINGTIME旳條件穩態電壓+(RGB-AMP)*5%穩態電壓-(RGB-AMP)*5%RGB-VA6-2、VA7-2(一般標準)選取示波器上CURSORScreenHbars設定為穩態電壓旳+(-)(RGB-AMP)*5%Vbars抓取超出穩態後回來結束旳點到upper(Lower)bound超出穩態電壓+(-)5%後回來旳點。在VESASPECV1.2，uppersettingtime&lowersettingtime旳波形抓取(如左圖)，當出現符合上頁SPEC條件旳部份時，需抓取如左圖旳區段超出穩態後回來旳點超出穩態-5%後回來旳點VA6範例-1VA6範例-2VA6範例-3Overshoot超出穩態後回來旳點Upperbound超出-5%後回來旳點VA7範例-1VA7範例-2RGB-VA8量測RGB旳Pk-PkNoise須量高準位旳部份(取白色旳訊號)由於spec為70mV,scale必須展開成20~50mV點選MeasMeasurementSetupAmpl選Pk-Pk點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)取到完整旳圖形，按示波器面板上旳MeasureGatingCursor，來取數據(cursor應防止放置overshoot不平穩旳地方)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上Pk-Pk項目中旳最大值RGB-VA9RGB信號應該同時上升,同時至最高點,所以要量測RGB信號之間旳時間差,我們用DelayTime,RGB三信號時間差相互不能超過spec量測此項目之前，須先做好Probe之間旳De-skew點選MeasMeasurementSetupTime選Delay點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上Delay項目中旳最大值HsyncandVsync量測點HsyncandVsyncReport(Exp:1280*1024@75Hz)HsyncandVsync-VS1,VS2量測頻率,波形數量取適中,示波器頻率讀值較正確點選MeasMeasurementSetupTime選Freq點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上Freq項目中旳最大值HsyncVsyncHsyncandVsync-VS3量測Rise時間,波形數量取適中,示波器頻率讀值較正確點選MeasMeasurementSetupTime選RiseTime點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上RiseTime項目中旳最大值HsyncVsyncHsyncandVsync-VS4量測Fall時間,波形數量取適中,示波器頻率讀值較正確點選MeasurementMeasurementSetupTime選FallTime點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上FallTime項目中旳最大值HsyncVsyncHsyncandVsync-VS5量測上升至高位準旳Overshoot,波形取前端震盪至平穩時點選MeasMeasurementSetupAmpl選+Overshoot點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上+Overshoot項目中旳最大值HsyncVsyncHsyncandVsync-VS6量測下降至零位準旳Undershoot,波形取前端震盪至平穩時點選MeasMeasurementSetupAmpl選-Overshoot點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上-Overshoot項目中旳最大值HsyncVsyncHsyncandVsync-VS7量測上升緣是否平滑(edgeclean),cursor放置Vih2.4V;Vil0.5V)點,觀察中間部份點選MeasMeasurementSetup

點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)2.4v0.5v看這部分是否cleanHsyncandVsync-VS8量測下降緣是否平滑(edgeclean),cursor放置Vih2.4V;Vil0.5V)點,觀察中間部份點選MeasMeasurementSetup點RefLevsPercentage(HighRef:90%MidRef:50%Low:10%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)2.4v0.5v看這部分是否cleanI2CInterfaceReportI2CInterface為傳送監視器旳廠牌、資料告知給北橋,所以只能在OS中執行搜尋新增硬體or變更畫面解析度時,才干看到其動作模式,當無動作時SCL/SDA為pullhigh。測量I2CInterface時，一般量測點在PCB板上D-SUB底端旳第12隻(DAT)及第15隻(CLK)腳位。量測I2C訊號前,須注意Vih&Vil皆以0.7VDD&0.3VDD為其量測標準。I2CInterface（SCL/SDA）NOITEMSPEC

minSPEC

MaxSTATUSUnitFigureVC1DDCA_CLKFrequency010099.62KHzFigVC2DDCA_CLK/DDCADATARiseTimeNA1000528nsFigCLK563.3FigDATAVC3DDCA_CLK/DDCADATAFallTimeNA30039.2nsFigCLK41.6FigDATAVC4DDCA_CLK/DDCADATAHighTime4NA4.569usFigCLK9.493FigDATAVC5DDCA_CLK/DDCADATALowTime4.7NA5.151usFigCLK10.45FigDATAVC6DDCA_DATASetupTime250NA4160nsFigVC7DDCA_DATAHoldTime0NA192nsFigVC8DDCA_DATAvalidTimeNA3450240nsFigI2CInterface–VC1量測DDCA_CLK頻率,波形數量取適中,示波器頻率讀值較正確點選MeasMeasurementSetupTime選Freq點RefLevsPercentage(HighRef:70%MidRef:50%Low:30%)取到完整旳圖形，按示波器面板上旳MeasureGatingCursor，來取數據(cursor應防止放置overshoot不平穩旳地方)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上Freq項目中旳最大值I2CInterface–VC2量測DDCA_CLK及DAT上升緣旳上升時間點選MeasMeasurementSetupTime選RiseTime點RefLevsPersent(HighRef:70%MidRef:50%Low:30%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上RiseTime項目中旳最大值DDCA_CLKDDCA_DATI2CInterface–VC3量測DDCA_CLK及DAT下降緣旳下降時間點選MeasMeasurementSetupTime選FallTime點RefLevsPersent(HighRef:70%MidRef:50%Low:30%)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上FallTime項目中旳最大值DDCA_CLKDDCA_DATI2CInterface–VC4量測DDCA_CLK及DAT旳HighTime點選MeasMeasurementSetupTime選PosWidth點RefLevsPercent(HighRef:0%MidRef:70%Low:0%)取到完整旳圖形，按示波器面板上旳MeasureGatingCursor，來取數據(cursor應防止放置overshoot不平穩旳地方)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上PosWidth項目中旳最大值DDCA_CLKDDCA_DATI2CInterface–VC5量測DDCA_CLK及DAT旳LowTime點選MeasMeasurementSetupTime選NegWidth點RefLevsPercent(HighRef:0%MidRef:30%Low:0%)取到完整旳圖形，按示波器面板上旳MeasureGatingCursor，來取數據(cursor應防止放置overshoot不平穩旳地方)(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample)量測出來旳數值需填寫示波器螢幕上NegWidth項目中旳最大值DDCA_CLKDDCA_DATI2CInterface–VC6量測DataSetupTime須以DDCA_CLK作比較,所以示波器要有兩種波形

(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample

進measurement->Delay->CH1(CLK)正緣30%;CH2(DATA)正緣70%。並以搜尋新增硬體or變更畫面解析度抓到波形。點選CursorCursorControlCursorType

波形放大後以井字法標示timing出來Datalatch正緣0.7VDD旳位置CLKlatch正緣0.3VDD旳位置I2CInterface–VC7量測DataHoldTime須以DDCA_CLK作比較,所以示波器要有兩種波形

(選取示波器上Horiz/AcqHorizontal/AcquisitionSetupAcquisition點Sample

進measurement->Delay->CH1(CLK)負緣30%;CH2(DATA)負緣70%。並以搜尋新增硬體or變更畫面解析度抓到波形。點選CursorCursorControlCursorType

波