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Project: HDMI/DVI out for STFM

Progress on our FPGA cores.
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Icky
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Re: Project: HDMI/DVI out for STFM

Post by Icky »

+1 for HDMI. As PaulJ said most things have HDMI these days.

With a lot of tv’s etc they are just HDMI. If you really need DVI use a converter.

Or you could go all Apple on this and have your own proprietary connector and sell the adaptor cables at a premium. :twisted:
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Smonson
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Re: Project: HDMI/DVI out for STFM

Post by Smonson »

Icky wrote: Tue Oct 30, 2018 7:13 pm Or you could go all Apple on this and have your own proprietary connector and sell the adaptor cables at a premium. :twisted:
I suppose that's one option! :D
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Re: Project: HDMI/DVI out for STFM

Post by Smonson »

I got some of the aforementioned Schmitt trigger buffers, this is what the output clock looks like (with 33R in series).
A0005DS.png
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exxos
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Re: Project: HDMI/DVI out for STFM

Post by exxos »

Smonson wrote: Sat Nov 03, 2018 7:57 am I got some of the aforementioned Schmitt trigger buffers, this is what the output clock looks like (with 33R in series).
Is that on x10 probe ? The scope will load the pins and not give proper reading unless on x10.
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Re: Project: HDMI/DVI out for STFM

Post by Smonson »

Yep - 10x. Presumably the load is in the ST side of things. Or some effect that I'm not aware of. I will try it with a smaller series resistor when I get a chance.
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Re: Project: HDMI/DVI out for STFM

Post by exxos »

Smonson wrote: Sat Nov 03, 2018 1:14 pm Yep - 10x. Presumably the load is in the ST side of things. Or some effect that I'm not aware of. I will try it with a smaller series resistor when I get a chance.
It does look like to much resistance there.
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Re: Project: HDMI/DVI out for STFM

Post by Smonson »

The new, smaller, shifter socket adapter board (fanout buffer version)... Unfortunately there's a slight overlap on the edge of an electrolytic on the ST that I failed to check, but I can always file it down a bit 😊

Other STs might not have that capacitor there anyway.
IMAG0011.jpg
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Re: Project: HDMI/DVI out for STFM

Post by Icky »

Nice.

Makes it more stable when in the shifter socket too without the overhang.
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Re: Project: HDMI/DVI out for STFM

Post by Smonson »

I just made the schmitt trigger version of the board and used a 0-ohm resistor for the (outgoing) clock - because I don't have anything less than 33ohms on hand - and I have recreated Exxos' symptoms! It's interesting to me because it looks pretty decent on the scope. I'll get a bunch of intermediate values in for more tests... but It's good to know that my ST isn't cursed with incessant reliability.
DS0000.gif
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