Hey!

In this document, TI considers using a unidirectional MMC level shifiter (so you need direction outputs)
MMC3 just has no direction outputs. but if you use a bidirectional level shifter you don't need those direction outputs.

I also considered using the TXS0106, but the BGA package is very expensive to manufacture for prototypes, so we choose the FXL2SD106 in a QFN package instead,
but it seems, that the FXL2SD106 doesn't do it's job correct.

@Philip: Thanks a lot, so I know that i need to have a look on the hardware.
You don't have your MMC3 initialization code somewhere around, you could post?
So i can completely sort out any software problems.

Regards

Bernhard Wörndl-Aichriedler


Am 08.05.2010 00:35, schrieb Krishna Sagiraju:
I'm surprised that mmc3 works with a voltage translator. According to
the following wiki:
http://processors.wiki.ti.com/index.php/SD-MMC_Usage_Notes_on_OMAP35x,
you can't!

Would you please elaborate on how you are using it more specifically?

Thanks,
--Krishna/.

On Fri, May 7, 2010 at 2:40 PM, Philip Balister <philip@balister.org> wrote:
  
On 05/07/2010 10:46 AM, Bernhard Wörndl-Aichriedler wrote:
    
Hey =)

I'm just working on a second SD Slot on one of my boards, but it's not
really working.

What I did:
1. Use an up-to-date u-boot, with pinmux fix for clk CLK.
2. Use and up-to-date kernel (2.6.33, the latest from Steve's Git)
3. Modify the board setup:
-- Added info for new mmc slot, (MMC3, bus width 4, transceiver true,
voltage 3.3V)

I use a FXL2SD106 Transceiver for level translation.

Are there any known issues with mmc3 or has anybody successfully enabled
mmc3?
      
I use MMC3 on a board that uses the TXS0206 chip.  (I think that is
right number).

No problems for us.

Philip

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