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Micro SD card interface support for TMS320C5515


I have interfacing micro SD card to TMS320C5515 DSP. My IO voltage is 1.8V. I am using an TI TXB0108 voltage level translator in between micro SD card and DSP due to voltage in compatibility.(i.e Micro SD works at 3.3V and My DSP IO lines works at 1.8V ).

Here I am not able to detect the micro SD card and I am not able to read or write onto the micro SD card.

But I tried the same code with our EVM(TMS320C5515) it worked fine.

Please let me know is their any setting that i need to follow since all my IO lines are operating at 1.8V. But in EVM all the IO lines are working at 3.3V.

And one more thing is If i try to make the MMC data and command line high by pulling the lines with external pull up, then also i could not see the high voltage on the lines. Can you please let me know what is the issue?

I need an solution immediately as my project is on hold due to this. I contacted my local TI FAE but he was not able to give any solution.


Nanda Kumar M