VGA标准显示接口信号量测PPT学习课件.ppt

按一下以編輯母片標題樣式,按一下以編輯母片文字樣式,第二層,第三層,第四層,第五層,#,D_SUB Measurement Skill,Data:2017/07,1,Test Tools,Tektronix TDS-7104 or Upper,。,Tektronix P6245,。,LCD or CRT Monitor,。,VGA,測試治具。,DMW Software,2,2025/4/14,VGA,測試治具,3,2025/4/14,Spec,參考,VESA Video Signal Standard Ver1,Rev1(,使用中,),VESA Video Signal Standard Ver1,Rev2(,使用中,),I2C-bus specification Ver2.1,4,2025/4/14,Test Item,Analog Video Output(RGB),Hsync and Vsync,I2C Interface(SCL/SDA),VCCDAC,5,2025/4/14,量測步驟,先行詢問,RD or PM,有無其它解析度要求，如有要求，則依照要求解析度量測。,若是硬體最高無法支援到,1600 120060Hz,，就以最高解析度量測。,進入,OS,後，將,LCD or CRT Monitor,的解析度調為,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,16001200/60Hz/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,Hide Bar,即可。,將,LCD or CRT connect,從,Motherboard,拔除，插上,VGA,測試治具。,請先測試,Hsync and Vsync,之頻率是否正確，如果不是正確之頻率，表示解析度不正確，請先確認解析度設定正確後再開始量測。,6,2025/4/14,量測步驟,請注意，不同解析度的,SPEC,也不同，需要重新找尋，並更新到,Report,上。,爾後所有項目量測出來的值必須以新的,Report,表格,(,內含,VESA SPEC.1.1&SPEC.1.2,的判定,),來出，,若客戶為,HP,，則必須僅用,VESA SPEC.1.2,的,Report,表格來出。,7,2025/4/14,RGB,量測點,8,2025/4/14,RGB Report(Exp:1280*102475Hz),9,2025/4/14,RGB-VA1,量,R,、,G,、,B Luminance Voltage,時，需量高準位的電壓,(,取白色的亮度,),點選,Meas,Measurement Setup,Ampl,選,High,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),取到完整的圖形，按示波器面板上的,Measure,Gating,Cursor,，來取,High Voltage(cursor,應避免放置,overshoot,不平穩的地方,),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Average,#of wfms,設,100),量測出來的數值需填寫示波器螢幕上,High,項目中的,最大值,10,2025/4/14,RGB-VA2,量測,RGB,上升緣的上升時間,點選,Meas,Measurement Setup,Time,選,Rise Time,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Rise Time,項目中的,最大值,記得將觸發換成上升及圖形展至最大,(,調整,scale),11,2025/4/14,RGB-VA3,測,RGB,下降緣的下降時間,點選,Meas,Measurement Setup,Time,選,Fall Time,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Fall Time,項目中的,最大值,記得將觸發換成下降及圖形展至最大,(,調整,scale),12,2025/4/14,RGB-VA4,量測,RGB,上升至高位準的,Overshoot,點選,Meas,Measurement Setup,Ampl,選,+,Overshoot,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,+Overshoot,項目中的,最大值,13,2025/4/14,RGB-VA5,測,RGB,上降至零位準的,Undershoot,點選,Meas,Measurement Setup,Ampl,選,-,Overshoot,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,-Overshoot,項目中的,最大值,14,2025/4/14,RGB Amplitude,量測,VA6,VA7,前需先行量測,R,、,G,、,B,訊號各別的,Amplitude,以作為參考值。,量測時需將時間拉大以確認,High,、,Low level,有標示在,nominal,位置,量測完後將圖檔另存為,RGB-AMP,並在,report,制作,link,15,2025/4/14,RGB-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,Histogram Vertical,，就可以看到分布圖，然後按示波器的,Stop,，讓波形停住,(,如下左圖為例,),，再去將,Trigger Level Marker,選為,Long,，然後將,Trigger,上調到分布圖最長的那個位準，是為穩態，穩態值會顯示在示波器最下方的,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,Histogram Vertical Off,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。,16,2025/4/14,RGB-VA6-1,量測,RGB,三色上升至高位準時第一個,Overshoot,的末端,取低點與穩態時之間的,tolerance,tolerance,不能超過穩態的,5%,若超過,看超過的時間有無超過,spec,可使用,cursor,來標示得知,點選,Meas,Measurement Setup,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Average,#of wfms,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%=690.64 mV 5%=34.532mV,。,故,Cursor,需標示,695+34.532=729.532 mV,695 34.532=660.468 mV,點選,Display,Objects Trigger Level Marker Long,，就可將此線顯示出來。,Overshoot,有超過穩態,且,Upper Bound,超出,穩,態電壓,-5%,則有量測,SETTING TIME,的條件,穩,態電壓,+(RGB-AMP)*5%,穩,態電壓,-(RGB-AMP)*5%,17,2025/4/14,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,Histogram Vertical,，就可以看到分布圖，然後按示波器的,Stop,，讓波形停住,(,如下左圖為例,),，此時的,Trigger Level Marker,已經是,Long,，然後將,Trigger,下調到分布圖最長的那個位準，是為穩態，穩態值會顯示在示波器最下方的,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,Histogram Vertical Off,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。,18,2025/4/14,RGB-VA7-1,量測,RGB,三色上升至高位準時第一個,Undershoot,的末端,取低點與穩態時之間的,tolerance,tolerance,不能超過穩態的,5%,若超過,看超過的時間有無超過,spec,可使用,cursor,來標示得知,點選,Meas,Measurement Setup,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Average,#of wfms,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%=690.64 mV 5%=34.532mV,。,故,Cursor,需標示,(-4)+34.532=30.532 mV,(-4)34.532=-38.532 mV,點選,Display,Objects Trigger Level Marker Long,，就可將此線顯示出來。,Overshoot,有超過穩態,且,Upper Bound,超出,穩,態電壓,-5%,則有量測,SETTING TIME,的條件,穩,態電壓,+(RGB-AMP)*5%,穩,態電壓,-(RGB-AMP)*5%,19,2025/4/14,RGB-VA6-2,、,VA7-2(,一般標準,),選取示波器上,CURSOR,Screen,H bars,設定為穩態電壓的,+(-),(RGB-AMP),*,5%,V bars,抓取,超出,穩態後回來結束的點,到,upper(Lower)bound,超出穩態電壓,+(-)5%,後回來的點。,在,VESA SPEC V1.2,，,upper setting time&lower setting time,的波形抓取,(,如左圖,),，,當出現符合上頁,SPEC,條件的部份時，需抓取,如左圖的區段,超出穩態後回來的點,超出穩態,-5%,後回來的點,20,2025/4/14,VA6,範例,-1,21,2025/4/14,VA6,範例,-2,22,2025/4/14,VA6,範例,-3,Overshoot,超出,穩態,後回來的點,Upper bound,超出,-5%,後回來的點,23,2025/4/14,VA7,範例,-1,24,2025/4/14,VA7,範例,-2,25,2025/4/14,RGB-VA8,量測,RGB,的,Pk-Pk Noise,須量高準位的部份,(,取白色的訊號,),由於,spec,為,70mV,scale,必須展開成,2050mV,點選,Meas,Measurement Setup,Ampl,選,Pk-Pk,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),取到完整的圖形，按示波器面板上的,Measure,Gating,Cursor,，來取數據,(cursor,應避免放置,overshoot,不平穩的地方,),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Pk-Pk,項目中的,最大值,26,2025/4/14,RGB-VA9,RGB,信號應該同時上升,同時至最高點,所以要量測,RGB,信號之間的時間差,我們用,Delay Time,R G B,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,之間的,De-skew,點選,Meas,Measurement Setup,Time,選,Delay,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Delay,項目中的,最大值,27,2025/4/14,Hsync and Vsync,量測點,28,2025/4/14,Hsync and Vsync Report(Exp:1280*102475Hz),29,2025/4/14,Hsync and Vsync-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,Meas,Measurement Setup,Time,選,Freq,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Freq,項目中的,最大值,Hsync,Vsync,30,2025/4/14,Hsync and Vsync-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,Meas,Measurement Setup,Time,選,Rise Time,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Rise Time,項目中的,最大值,Hsync,Vsync,31,2025/4/14,Hsync and Vsync-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,Measurement,Measurement Setup,Time,選,Fall Time,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Fall Time,項目中的,最大值,Hsync,Vsync,32,2025/4/14,Hsync and Vsync-VS5,量測上升至高位準的,Overshoot,波形取前端震盪至平穩時,點選,Meas,Measurement Setup,Ampl,選,+,Overshoot,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,+Overshoot,項目中的,最大值,Hsync,Vsync,33,2025/4/14,Hsync and Vsync-VS6,量測下降至零位準的,Undershoot,波形取前端震盪至平穩時,點選,Meas,Measurement Setup,Ampl,選,-,Overshoot,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setu p,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,-Overshoot,項目中的,最大值,Hsync,Vsync,34,2025/4/14,Hsync and Vsync-VS7,量測上升緣是否平滑,(edge clean),cursor,放置,Vih2.4V;Vil0.5V),點,觀察中間部份,點選,Meas,Measurement Setup,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),2.4v,0.5v,看這部分是否,clean,35,2025/4/14,Hsync and Vsync-VS8,量測下降緣是否平滑,(edge clean),cursor,放置,Vih2.4V;Vil0.5V),點,觀察中間部份,點選,Meas,Measurement Setup,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),2.4v,0.5v,看這部分是否,clean,36,2025/4/14,I2C Interface Report,I2C Interface,為傳送監視器的廠牌、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,才能看到其動作模式,當無動作時,SCL/SDA,為,pull high,。,測量,I2C Interface,時，通常量測點在,PCB,板上,D-SUB,底端的第,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,。,I2C Interface,（,SCL/SDA,）,NO,ITEM,SPECmin,SPECMax,STATUS,Unit,Figure,VC1,DDCA_CLK Frequency,0,100,99.62,KHz,Fig,VC2,DDCA_CLK/DDCA DATA Rise Time,NA,1000,528,ns,Fig CLK,563.3,Fig DATA,VC3,DDCA_CLK/DDCA DATA Fall Time,NA,300,39.2,ns,Fig CLK,41.6,Fig DATA,VC4,DDCA_CLK/DDCA DATA High Time,4,NA,4.569,us,Fig CLK,9.493,Fig DATA,VC5,DDCA_CLK/DDCA DATA Low Time,4.7,NA,5.151,us,Fig CLK,10.45,Fig DATA,VC6,DDCA_DATA Setup Time,250,NA,4160,ns,Fig,VC7,DDCA_DATA Hold Time,0,NA,192,ns,Fig,VC8,DDCA_DATA valid Time,NA,3450,240,ns,Fig,37,2025/4/14,I2C Interface 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,Meas,Measurement Setup,Time,選,Freq,點,Ref Levs,Percentage,(High Ref:70%Mid Ref:50%Low:30%),取到完整的圖形，按示波器面板上的,Measure,Gating,Cursor,，來取數據,(cursor,應避免放置,overshoot,不平穩的地方,),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Freq,項目中的,最大值,38,2025/4/14,I2C Interface VC2,量測,DDCA_CLK,及,DAT,上升緣的上升時間,點選,Meas,Measurement Setup,Time,選,Rise Time,點,Ref Levs,Persent,(High Ref:70%Mid Ref:50%Low:30%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Rise Time,項目中的,最大值,DDCA_CLK,DDCA_DAT,39,2025/4/14,I2C Interface VC3,量測,DDCA_CLK,及,DAT,下降緣的下降時間,點選,Meas,Measurement Setup,Time,選,Fall Time,點,Ref Levs,Persent,(High Ref:70%Mid Ref:50%Low:30%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Fall Time,項目中的,最大值,DDCA_CLK,DDCA_DAT,40,2025/4/14,I2C Interface VC4,量測,DDCA_CLK,及,DAT,的,High Time,點選,Meas,Measurement Setup,Time,選,Pos Width,點,Ref Levs,Percent(High Ref:0%Mid Ref:,70%,Low:0%),取到完整的圖形，按示波器面板上的,Measure,Gating,Cursor,，來取數據,(cursor,應避免放置,overshoot,不平穩的地方,),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Pos Width,項目中的,最大值,DDCA_CLK,DDCA_DAT,41,2025/4/14,I2C Interface VC5,量測,DDCA_CLK,及,DAT,的,Low Time,點選,Meas,Measurement Setup,Time,選,Neg Width,點,Ref Levs,Percent(High Ref:0%Mid Ref:,30%,Low:0%),取到完整的圖形，按示波器面板上的,Measure,Gating,Cursor,，來取數據,(cursor,應避免放置,overshoot,不平穩的地方,),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),量測出來的數值需填寫示波器螢幕上,Neg Width,項目中的,最大值,DDCA_CLK,DDCA_DAT,42,2025/4/14,I2C Interface VC6,量測,Data Setup Time,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/Acq,Horizontal/Acquisition Setup,Acquisition,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,Cursor,Cursor Control,Cursor Type,波形放大後以,井,字法標示,timing,出來,Data latch,正緣,0.7VDD,的位置,CLK latch,正緣,0.3VDD,的位置,43,2025/4/14,I2C Interface VC7,量測,Data Hold Time,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/Acq,Horizontal/Acquisition Setup,Acquisition,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,Cursor,Cursor Control,Cursor Type,波形放大後以,井,字法標示,timing,出來,Data latch,負緣,0.7VDD,的位置,CLK latch,負緣,0.3VDD,的位置,44,2025/4/14,I2C Interface VC8,量測,Data Valid,Time,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/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample,進,measurement-Delay-,CH1(CLK),負緣,30%;CH2(DATA),負緣,30%,。並以搜尋新增硬體,or,變更畫面解析度抓到波形。,點選,Cursor,Cursor Control,Cursor Type,波形放大後以,井,字法標示,timing,出來,Data latch,負緣,0.3VDD,的位置,CLK latch,負緣,0.3VDD,的位置,45,2025/4/14,VCCDAC,此一電壓的不穩定會造成水波紋的產生,所以波形要看累積後的,Max/Min,與不累積時有無雜訊干擾,量電壓,(,累積,)scale,展成,200uS,。量測結果以,Design,的電壓,+/-5%,為,spec,。,點選,Meas,Measurement Setup,Ampl,選,Max,Mean,Min,點,Ref Levs,Percentage(High Ref:90%Mid Ref:50%Low:10%),(,選取示波器上,Horiz/Acq,Horizontal/Acquisition Setup,Acquisition,點,Sample),46,2025/4/14,Jitter test,點選,App,Jitter Analysis-Essentials,點,Go to Resuits,Measurement,選,Wizard,47,2025/4/14,Jitter test,1.Measurement,C,ategory,勾選,Clock,2.M,easurement,勾選,P,eriod,3.,Measurement,S,ource,選,Probe,的,Channel,4.,Measurement Configuration,自動跳過,(dont care),5.Autoset,S,ource,S,cales,選,YES,6.,Autoset,S,ource,R,eference,L,evels,選,YES,7.,不勾選項目,直接,Run,1,2,48,2025/4/14,Jitter test,5,6,7,3,49,2025/4/14,Jitter test,Note1:,需測試,100,000,筆以上,Note2:Jitter,test,依客戶要求,增加量測,50,2025/4/14,