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32MB SDRAM 3 Pins?

Posted: Thu Jul 25, 2024 8:10 pm
by lordoftime79

What do the 3 pins actually do? What do they actually connect to?


Re: 32MB SDRAM 3 Pins?

Posted: Fri Jul 26, 2024 8:53 am
by FPGA64

If you have that on your ram its an Ancient design. It would be advisable to just get a new Ram expansion.


Re: 32MB SDRAM 3 Pins?

Posted: Fri Jul 26, 2024 11:42 am
by lordoftime79

i already have and thats whats made me question it? what do they do? what do they connect to?


Re: 32MB SDRAM 3 Pins?

Posted: Fri Jul 26, 2024 12:15 pm
by FPGA64

https://www.legacypixels.com/docs/miste ... _guide.pdf

This shows those 3 pins going into the header pins on the Main Board. Its a very ancient design though and all newer boards dont do it this way


Re: 32MB SDRAM 3 Pins?

Posted: Fri Jul 26, 2024 1:00 pm
by lordoftime79

but what signals are the 3 pins?


Re: 32MB SDRAM 3 Pins?

Posted: Fri Jul 26, 2024 1:03 pm
by FPGA64

you would need to get the DE10 pin outs from its tech docs and work out which pins were involved


Re: 32MB SDRAM 3 Pins?

Posted: Fri Jul 26, 2024 2:58 pm
by lordoftime79

I think they are SCL SDA and AnalougeVref can anyone confirm this?


Re: 32MB SDRAM 3 Pins?

Posted: Sat Jul 27, 2024 12:56 am
by Antoine.WG
lordoftime79 wrote: Fri Jul 26, 2024 2:58 pm

I think they are SCL SDA and AnalougeVref can anyone confirm this?

The header is the same pinout as an Arduino R3. If it's the 3 pins on the end of GPIO0, then it is SCL, SDA and Analog Vref. If it's GPIO1, then it's 3 analog input pins. It's D0, D1 and D2 on the Arduino header, and those pins are only present on the GPIO0 side. I'm not 100% sure, but it looks like there is an alternate position for GPIO1, but that prevents the use of an I/O board. My I/O board has a notch for the 3 pins on the GPIO0 side.