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    UFS1 Support on J5?

    VOXL 2
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    • O
      olearypa
      last edited by 8 Jan 2025, 19:55

      For a carrier board design, we are investigating taking advantage of the UFS1 interface available on J5 of the VOXL2 for additional storage beyond that on board the SOM. Are there any gotchas we should be aware of? Would we need to make any device tree changes if we wanted to use it?

      M V 2 Replies Last reply 10 Jan 2025, 00:15 Reply Quote 0
      • M
        Moderator ModalAI Team @olearypa
        last edited by 10 Jan 2025, 00:15

        @olearypa Hi, we asked around. It seems like it should work as is, but we have not confirmed or tried it

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        • V
          Vinny ModalAI Team @olearypa
          last edited by 13 Jan 2025, 20:27

          Hi @olearypa
          I suggest trying it on this board first: https://www.modalai.com/collections/expansion-board/products/m0062-2
          That socket is a UFS/uSD combo mode socket and has the UFS signals on it: https://docs.modalai.com/m0062-datasheet/#j7---usdufs-combo-card-slot

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          • O
            olearypa
            last edited by 19 May 2025, 20:49

            While we do have an M0062-2, UFS cards are like hens' teeth. Looks like eBay is about the only way to get one; Samsung seems to have stopped making them.

            We did notice the SD_UFS_CARD_DET_N signal on J5 pin A12; is it reasonable to assume that we'd need to pull that pin low even if using a UFS chip (rather than a card) in order to signal the presence of the device?

            V 1 Reply Last reply 20 May 2025, 16:50 Reply Quote 0
            • V
              Vinny ModalAI Team @olearypa
              last edited by 20 May 2025, 16:50

              Hi @olearypa
              Oh wow, you are right.
              I guess UFS never took off since SD cards are so awesome now....
              Last year these little sharkfin cards were easy to get...
              1aec8fb5-53b7-4e98-81bc-4748bec81efe-image.png
              I guess not so much anymore.

              Sadly, I'm not sure how easy it is to design a plug-in board with UFS discrete since it requires other signals that we did not expose (given at the time UFS cards were abundant). The core 1.2V power rail is not brought to J5, and we have not verified if you do your own 1.2V supply that the power on timing will be satisfied. It's a risk to do it since we have not verified it, but give yourself an option to adjust power on timing if you try it. I'm not sure how the device tree needs to be changed, but I'm thinking there should be a way to indicate a non-removable device such that the DET signal is not needed. But, as a back-up, you should give the option to GND it as if it was using a socket.

              O 1 Reply Last reply 27 May 2025, 22:49 Reply Quote 0
              • O
                olearypa @Vinny
                last edited by 27 May 2025, 22:49

                @Vinny For sure I think SD Express--with a major consumer device which uses them coming out in a week--won the very short lived MicroSD replacement war, even though UFS is (thankfully) taking over the internal storage market. Thanks for the hints; we'll see what we can come up with.

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