Subject: Re: [stella] Re: [Fpga2600] Where am I going wrong? From: "Eric Ball" <ericball@xxxxxxxxxxxx> Date: Thu, 2 Jun 2005 23:34:39 -0400 |
In http://cuddlepuddle.org/~adam/oneline.gif the active video is too long. There should be at least a 1.5uS "front porch" of blank before the 4.7uS sync pulse. I also don't like the glitch during the sync pulse (which is also in http://cuddlepuddle.org/~adam/onelineb.gif) > I've found different references for various voltage levels. One source > says black at .3, another .4, and another says "blank" at .40 and black > at .48, while some don't mention "blank" at all! Note: with Japan NTSC blank = black, which may be some of the confusion. 140 IRE = 1 volt sync 0 IRE = 0.000V blank 40 IRE = 0.286V black 47.5 IRE = 0.339V max white 140 IRE = 1.000V colorburst 40 IRE peak to peak (0.143 - 0.429V) max white with colorburst 120-160 IRE = 0.857-1.143V You may want to make COLU=0x?E 0.857V so you don't overdrive the video. Most TVs will do some AGC based on the sync pulse and colorburst, so if your voltages are off a little (but your ratios are correct) you should end up with a decent signal. Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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