Nat wrote: ↑Thu Aug 06, 2020 6:59 pm
Looking at your memory test results your SDRAM has an issue, the single number 1 on the second line denotes you have a 32MB module (1 = 32MB, 2 = 64MB, 3 = 128MB).
The 070 on the top line denotes the current speed in Mhz the memory is being tested at. It will have started the test at 160Mhz and then when it detects an error is down clocks by 10Mhz until it finds a stable speed, the lowest it will down clock is to 70Mhz, so it has encountered an error at every tested speed. The red number on the bottom row is the number of errors.
I would recommend that you remove and reinstall your SDRAM module and run the test again. If this still fails I would contact the seller and see about getting a replacement module. If you have made the memory module yourself check for solder bridges on any of the chips pins.
I see, thanks for the explanation of the memtest.
I have removed and reinstalled it 3 times and no luck. I think the chip is busted. I reflowed the visible pins too.
I ordered from ultimatemister a few years ago but last time I tried to make an order there this year they didn't even reply so I'm not going to bother with that. My SDRAM is due an upgrade anyways.
I think I will order the PCB from misterfpga.co.uk and solder one up myself. Would anyone happen to have a BOM for the SDRAM XS-D v2.5? I can't find it anywhere
edit: Found it here:
https://github.com/MiSTer-devel/Main_Mi ... mbly-(DIY)
"SDRAM Board v2.4/v2.5 (dual chip)
top row: 10uf, 0.1uf, 10uf, 0.1uf
bottom row: 10uf, 1uf, 1uf, 10uf, 10uf, 1uf, 1uf, 10uf"
But what goes on U3?