Hi, "This is the input pin for the 28.6363 MHz crystal, or can be overdriven > by an external 3.3 V, 27 MHz clock oscillator source. In crystal mode, > _the crystal must be a fundamental crystal_." > > The crystal that I initially selected (CITIZEN AMERICA CSA309) is a > fundamental crystal. The Yoketan units you have should probably be as > well (the datasheet says "nominal frequency"), but if it's in fact an > overtone crystal, this might explain the problems we had... > > I didn't realize how real difference between the word 'fundamental' and 'nominal'. But it really is worth to learn more about crystal basis. Dàn zhè quèshí shì zhídé qù shēnrù liǎojiě dì dìfāng. 將中文翻譯為英文
I just checked this after I noticed that the amplitude of the > oscillations with my crystal (CSA309) is some 2x bigger than with your > crystal (Yoketan). That being said, I measured the oscillation with the > CSA309 only on my board with the non-working video input, so it could > simply be linked to that problem instead. > After you replaced with the CSA309 crystal, has the SECAM problem just been disappeared? It's good capture that you found yours is 2x bigger than mine here, but it's bad that I don't have yours to compare. But it indeed, I'll consult with vendor more about this. > > In either case, check that before selecting a new crystal for RC3. > Sure I got the same smd type of Y1, and used on my 0x24, it works well then. So I'll compare/watch out those different xtal. -adam
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