Project: HDMI/DVI out for STFM

General discussions or ideas about hardware.
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exxos
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Re: Project: HDMI/DVI out for STFM

Post by exxos » Sat Sep 01, 2018 8:45 am

Smonson wrote:
Sat Sep 01, 2018 8:41 am
The 5 spare pins in the vsync connector pass through a 5-to-3.3v buffer which then go on to the FPGA board. E.g. the centre pin beside vsync goes to FPGA pin 21, which can be bridged across to 17 or wherever. Troed did it this way.
Ah, would make life easier if theres a 5>3.3 translate already to the FPGA which I can simply wire into..

Will try and do that monday..
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Re: Project: HDMI/DVI out for STFM

Post by Smonson » Sat Sep 01, 2018 8:52 am

I can't guarantee that the buffer will be fast enough for the 32MHz clock though, I recommend checking it on a scope before depending on it.

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Re: Project: HDMI/DVI out for STFM

Post by exxos » Sat Sep 01, 2018 10:34 am

Smonson wrote:
Sat Sep 01, 2018 8:52 am
I can't guarantee that the buffer will be fast enough for the 32MHz clock though, I recommend checking it on a scope before depending on it.
OK, what chip did you use ?
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: Project: HDMI/DVI out for STFM

Post by Smonson » Sat Sep 01, 2018 10:52 am

exxos wrote:
Sat Sep 01, 2018 10:34 am
OK, what chip did you use ?
74LVC245A
https://assets.nexperia.com/documents/d ... CH245A.pdf

poobah
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Re: Project: HDMI/DVI out for STFM

Post by poobah » Sun Sep 02, 2018 3:41 pm

Smonson wrote:
Sat Sep 01, 2018 10:52 am
exxos wrote:
Sat Sep 01, 2018 10:34 am
OK, what chip did you use ?
74LVC245A
https://assets.nexperia.com/documents/d ... CH245A.pdf
Have you guys looked at the IDT QuickSwitch devices?

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Re: Project: HDMI/DVI out for STFM

Post by exxos » Sun Sep 02, 2018 4:20 pm

poobah wrote:
Sun Sep 02, 2018 3:41 pm
Have you guys looked at the IDT QuickSwitch devices?
I'm using them :)
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: Project: HDMI/DVI out for STFM

Post by troed » Sun Sep 02, 2018 4:37 pm

Smonson wrote:
Sat Sep 01, 2018 10:52 am
exxos wrote:
Sat Sep 01, 2018 10:34 am
OK, what chip did you use ?
74LVC245A
https://assets.nexperia.com/documents/d ... CH245A.pdf
Seems plenty fast according to that spec sheet, unless I'm misunderstanding something.

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Re: Project: HDMI/DVI out for STFM

Post by exxos » Sun Sep 02, 2018 4:57 pm

troed wrote:
Sun Sep 02, 2018 4:37 pm
Seems plenty fast according to that spec sheet, unless I'm misunderstanding something.
I think it was just a suggestion..Nothing wrong with those of course.

For my stuff, I am pushing every MHz out of everything, so the IDT switches have pretty much zero delay, which is what I need. In case of the FPGA stuff, a few ns isn't going to make any odds. Though I guess the IDT stuff may be easier to solder as they (IIRC) are larger packages.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
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Re: Project: HDMI/DVI out for STFM

Post by poobah » Sun Sep 02, 2018 8:18 pm

exxos wrote:
Sun Sep 02, 2018 4:57 pm
... Though I guess the IDT stuff may be easier to solder as they (IIRC) are larger packages.
Yup, I solder them by hand fairly easily.

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Re: Project: HDMI/DVI out for STFM

Post by Smonson » Mon Sep 03, 2018 12:30 am

The only reason I mention the buffer is that the one I used for the 16MHz line (M74VHC1GT125DF2G) can't hack it at 32MHz. Since 16MHz is not too fast by today's standards I didn't worry about it when selecting buffers.

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