8051 to DVI interface?
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From: nappy on 16 Feb 2007 10:10 "Guy Macon" <http://www.guymacon.com/> wrote in message news:7NOdnRS-BvgQ10jY4p2dnA(a)giganews.com... > Tell me, what does the "A" in "DVI-A" stand for? As you know the A stands for ANALOG. The Analog portion of the DVI connector is a VGA signal set piggybacked on the DVI interface. There is no ANALOG-DIGITAL-VIDEO format. Nor is there any ANALOG - DIGITAL Anything format. When I am told there is a DVI signal in a system I never ask "Is it the Analog DVI?", cause I like my job. You can find the timings for generating vga, svga, xga, sxga, uxga anywhere on the web. The pixel clock for xga is 65 Mhz. Don't forget the inactive, non-displayed portions of the signal. test over. > > > Guy Macon > <http://www.guymacon.com/
From: Didi on 16 Feb 2007 10:34 > The pixel clock for xga is 65 Mhz. >... This makes something like 70 Hz V-sync frequency. I wonder why do they refresh the TFT-displays that frequently, they don't have the flicker CRTs had. Those TFT modules I have used can work at much lower frequencies, 30 Hz V-sync is quite achievable. I suspect this should be the case with "digital" only monitors - do you know if it is? Dimiter ------------------------------------------------------ Dimiter Popoff Transgalactic Instruments http://www.tgi-sci.com ------------------------------------------------------ On Feb 16, 5:10 pm, "nappy" <s...(a)spam.com> wrote: > "Guy Macon" <http://www.guymacon.com/> wrote in message > > news:7NOdnRS-BvgQ10jY4p2dnA(a)giganews.com... > > > Tell me, what does the "A" in "DVI-A" stand for? > > As you know the A stands for ANALOG. The Analog portion of the DVI connector > is a VGA signal set piggybacked on the DVI interface. There is no > ANALOG-DIGITAL-VIDEO format. Nor is there any ANALOG - DIGITAL Anything > format. When I am told there is a DVI signal in a system I never ask "Is it > the Analog DVI?", cause I like my job. > > You can find the timings for generating vga, svga, xga, sxga, uxga anywhere > on the web. > > The pixel clock for xga is 65 Mhz. Don't forget the inactive, non-displayed > portions of the signal. > > test over. > > > > > Guy Macon > > <http://www.guymacon.com/
From: nappy on 16 Feb 2007 10:50 "Didi" <dp(a)tgi-sci.com> wrote in message news:1171640069.588728.113820(a)l53g2000cwa.googlegroups.com... >> The pixel clock for xga is 65 Mhz. >>... > > This makes something like 70 Hz V-sync frequency. > I wonder why do they refresh the TFT-displays that > frequently, they don't have the flicker CRTs had. > Those TFT modules I have used can work at much lower > frequencies, 30 Hz V-sync is quite achievable. I suspect > this should be the case with "digital" only > monitors - do you know if it is? > > Dimiter The monitors I develop are multi format. The H&V timings for DVI are equivalent to VGA timings. Regardless of the display type. > > ------------------------------------------------------ > Dimiter Popoff Transgalactic Instruments > > http://www.tgi-sci.com > ------------------------------------------------------ > > On Feb 16, 5:10 pm, "nappy" <s...(a)spam.com> wrote: >> "Guy Macon" <http://www.guymacon.com/> wrote in message >> >> news:7NOdnRS-BvgQ10jY4p2dnA(a)giganews.com... >> >> > Tell me, what does the "A" in "DVI-A" stand for? >> >> As you know the A stands for ANALOG. The Analog portion of the DVI >> connector >> is a VGA signal set piggybacked on the DVI interface. There is no >> ANALOG-DIGITAL-VIDEO format. Nor is there any ANALOG - DIGITAL Anything >> format. When I am told there is a DVI signal in a system I never ask "Is >> it >> the Analog DVI?", cause I like my job. >> >> You can find the timings for generating vga, svga, xga, sxga, uxga >> anywhere >> on the web. >> >> The pixel clock for xga is 65 Mhz. Don't forget the inactive, >> non-displayed >> portions of the signal. >> >> test over. >> >> >> >> > Guy Macon >> > <http://www.guymacon.com/ > >
From: Didi on 16 Feb 2007 11:18 > The monitors I develop are multi format. The H&V timings for DVI are > equivalent to VGA timings. Regardless of the display type. Thanks, I hoped this would be the reason. This makes it quite likely that digital-only interfaced monitors will work at much lower frequencies than 60-70 Hz, perhaps out of spec. (One reason to prefer lower frequencies is to have the RAM consume less power). I still wonder why the strive for faster TFT-s, they now specify 8 mS response times, what's that about? I doubt we can see the difference between 30 and 8 mS... But then may be the test conditions are such that 8 mS is 10 to 90% and the tails are much longer and can be seen at lower speeds, I never dug into that. Dimiter On Feb 16, 5:50 pm, "nappy" <s...(a)spam.com> wrote: > "Didi" <d...(a)tgi-sci.com> wrote in message > > news:1171640069.588728.113820(a)l53g2000cwa.googlegroups.com... > > >> The pixel clock for xga is 65 Mhz. > >>... > > > This makes something like 70 Hz V-sync frequency. > > I wonder why do they refresh the TFT-displays that > > frequently, they don't have the flicker CRTs had. > > Those TFT modules I have used can work at much lower > > frequencies, 30 Hz V-sync is quite achievable. I suspect > > this should be the case with "digital" only > > monitors - do you know if it is? > > > Dimiter > > The monitors I develop are multi format. The H&V timings for DVI are > equivalent to VGA timings. Regardless of the display type. > > > > > ------------------------------------------------------ > > Dimiter Popoff Transgalactic Instruments > > >http://www.tgi-sci.com > > ------------------------------------------------------ > > > On Feb 16, 5:10 pm, "nappy" <s...(a)spam.com> wrote: > >> "Guy Macon" <http://www.guymacon.com/> wrote in message > > >>news:7NOdnRS-BvgQ10jY4p2dnA(a)giganews.com... > > >> > Tell me, what does the "A" in "DVI-A" stand for? > > >> As you know the A stands for ANALOG. The Analog portion of the DVI > >> connector > >> is a VGA signal set piggybacked on the DVI interface. There is no > >> ANALOG-DIGITAL-VIDEO format. Nor is there any ANALOG - DIGITAL Anything > >> format. When I am told there is a DVI signal in a system I never ask "Is > >> it > >> the Analog DVI?", cause I like my job. > > >> You can find the timings for generating vga, svga, xga, sxga, uxga > >> anywhere > >> on the web. > > >> The pixel clock for xga is 65 Mhz. Don't forget the inactive, > >> non-displayed > >> portions of the signal. > > >> test over. > > >> > Guy Macon > >> > <http://www.guymacon.com/
From: nappy on 16 Feb 2007 11:34
"Didi" <dp(a)tgi-sci.com> wrote in message news:1171642702.774882.154750(a)q2g2000cwa.googlegroups.com... >> The monitors I develop are multi format. The H&V timings for DVI are >> equivalent to VGA timings. Regardless of the display type. > > Thanks, I hoped this would be the reason. This makes it quite > likely that digital-only interfaced monitors will work at > much lower frequencies than 60-70 Hz, perhaps out of spec. > (One reason to prefer lower frequencies is to have the RAM > consume less power). > I still wonder why the strive for faster TFT-s, they > now specify 8 mS response times, what's that about? Graphics, animation, video. > I doubt we can see the difference between 30 and 8 mS... Oh yes we certainly can. Especially when it is repetetive. > But then may be the test conditions are such that 8 mS > is 10 to 90% and the tails are much longer and can be > seen at lower speeds, I never dug into that. > > Dimiter > > On Feb 16, 5:50 pm, "nappy" <s...(a)spam.com> wrote: >> "Didi" <d...(a)tgi-sci.com> wrote in message >> >> news:1171640069.588728.113820(a)l53g2000cwa.googlegroups.com... >> >> >> The pixel clock for xga is 65 Mhz. >> >>... >> >> > This makes something like 70 Hz V-sync frequency. >> > I wonder why do they refresh the TFT-displays that >> > frequently, they don't have the flicker CRTs had. >> > Those TFT modules I have used can work at much lower >> > frequencies, 30 Hz V-sync is quite achievable. I suspect >> > this should be the case with "digital" only >> > monitors - do you know if it is? >> >> > Dimiter >> >> The monitors I develop are multi format. The H&V timings for DVI are >> equivalent to VGA timings. Regardless of the display type. >> >> >> >> > ------------------------------------------------------ >> > Dimiter Popoff Transgalactic Instruments >> >> >http://www.tgi-sci.com >> > ------------------------------------------------------ >> >> > On Feb 16, 5:10 pm, "nappy" <s...(a)spam.com> wrote: >> >> "Guy Macon" <http://www.guymacon.com/> wrote in message >> >> >>news:7NOdnRS-BvgQ10jY4p2dnA(a)giganews.com... >> >> >> > Tell me, what does the "A" in "DVI-A" stand for? >> >> >> As you know the A stands for ANALOG. The Analog portion of the DVI >> >> connector >> >> is a VGA signal set piggybacked on the DVI interface. There is no >> >> ANALOG-DIGITAL-VIDEO format. Nor is there any ANALOG - DIGITAL >> >> Anything >> >> format. When I am told there is a DVI signal in a system I never ask >> >> "Is >> >> it >> >> the Analog DVI?", cause I like my job. >> >> >> You can find the timings for generating vga, svga, xga, sxga, uxga >> >> anywhere >> >> on the web. >> >> >> The pixel clock for xga is 65 Mhz. Don't forget the inactive, >> >> non-displayed >> >> portions of the signal. >> >> >> test over. >> >> >> > Guy Macon >> >> > <http://www.guymacon.com/ > > |