RE: Efinix Dev Board - PSRAM working

misaz — Sun, 08 Jan 2023 22:13:54 GMT

Nice project. Thank you for these detailed blogs. [emoticon:c4563cd7d5574777a71c318021cbbcc8]

RE: Efinix Dev Board - PSRAM working

shabaz — Sun, 08 Jan 2023 20:19:27 GMT

Hi Michael,

Interesting project! How does psr_dat_o and psr_dat_i connect to the two PSRAM chip SIO pins?

It would be interesting to try the code (probably on a different FPGA board, I have a couple I could attempt it on), I need to get hold of of those chips.

Incidentally, I found this thing on AliExpress, although I don't think it may be useful for your scenario, where trace length matching is needed to the real chip:

6x8mm 1.27mm pitch

That's for a larger device (6x8mm), I needed it for reading and programming a Flash chip.

However I just received it, and the quality is really good. So I'm thinking of getting the 3x3mm one (0.65mm pitch).

They also have 2x2mm (0.5mm pitch).

I have no idea if the quality of the 3x3 and 2x2 will be the same as the 6x8mm one. The 6x8 looks darker than the 3x3 and 2x2 ones.

This is what arrived:

Zoomed in:

Other side; I'll need to create a little PCB for this, to adapt to (say) 0.1" header pins, but I might also need an optional level converter on there too:

As mentioned I don't know if they would be useful for your performance scenario, these may be more useful for pulling data off chips etc.