Electronics > FPGA

SD card/SDIO 3.0 level translation solution

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asmi:

--- Quote from: EEEnthusiast on February 04, 2020, 02:43:28 pm ---If you could do a small board with the IP4856CX25, the SD card connector and another high speed connector to the FPGA board, your problem could be solved. The small board wont cost much even with the microvias. You could use fine pitch board to board connectors and add extra mechanical strength using nuts, bolts and spacers.

--- End quote ---
I did investigate this solution, and it turned out very expensive unless I invest a ton of money and make a very large run. But more broadly speaking, this whole thing sounds like a solution to a problem that shouldn't exist in the first place. I left this project alone for now, but I would skill very much like to know if any sane solution exists.

mark03:

--- Quote from: asmi on February 04, 2020, 03:23:44 pm ---But more broadly speaking, this whole thing sounds like a solution to a problem that shouldn't exist in the first place. I left this project alone for now, but I would skill very much like to know if any sane solution exists.

--- End quote ---

So would I!  Very curious to hear if someone has tried the A2 cards in a 1.8V-only system.  Agree that the whole situation is sort of ridiculous.  It would make a good case study in the perils of backwards compatibility.

asmi:
This is an old topic, but now we finally have a proper solution: https://www.nxp.com/part/NVT4858HK#/ This part is available in QFN-like package.

mark03:
Thanks for sharing this!

I am still wondering though, Do we know if level translation is actually required in a 1.8V system, where you have the option of choosing the SD card yourself?  Interested in both "official" and "unofficial" answers.

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