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SDIO Redriver/buffer solution

Matt Staniszewski
Prodigy 50 points
Other Parts Discussed in Thread: TXS02612

Hi all,

We have a MCU that needs to communicate to an SD card using SDIO over a cable if possible.  Due to the <100mm requirement for SDIO, we're looking for either a buffer/redriver solution or converting to another protocol for going over the wire.

We are planning to 4-bit SDIO 3.01 up to 200Mbps.  

What would you suggest?  We see a few solutions on the forums, but most are <100Mbps.

Best,

Matt

  • 0
    TI__Guru 50446 points

    Hi Matt,

    As of this time, TXS02612 has the max data rate for SDIO up to 120Mbps.

    Could you further clarify the timeline for when the translator is needed, as we do have a new device defined for SD3.0 coming soon and spec'd to support up to 400Mbps? Thanks.

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    Prodigy 50 points

    Hi Michael,

    Unfortunately, we are spinning a new PCBA right now, but fortunately it looks like we can run slower (100-200Mbps) and achieve the performance we're looking for.  Does the TXS02612 do any signal conditioning/buffering, or is it just a passthrough?  We need to run these signals over a greater distance than ~4" that SDIO specs I have state.

    Matt

  • +1 in reply to Matt Staniszewski
    TI__Guru 50446 points

    Hi Matt,

    Understood. The TXS device should work fine for <100mm or <4'' while keeping the loading as minimal as possible (<70 pF).

    Note that the length is typically also proportional to the capacitance. Hence, additional capacitance could be included with the additional length and would further suggest paralleled channels inside the same device to help improve the output driving capacity. For example, the device can have multiple input channels paralleled to drive a 140 pF load with relatively good performance.

    Please also see this FAQ and SD card redriver/buffer similar thread for additional suggestions, thanks.

    Best Regards,

    Michael.