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Hi,
I think if you just write any data into the SD card through C55xx DSP and read from PC/Laptop it would not work, this needs to be on a FS.
Please go through the below wiki page, this would provide details on the Audio/Voice application systems overview.
http://processors.wiki.ti.com/index.php/C5000_Audio_Voice_application#System_Block_Diagram
You could also refer to some of the SD card examples available in 3.04 CSL package - C55XCSL-LOWPOWER:
SD Card File System related Examples - CSL_MMCSD_SdCardFSExample_Out , CSL_MMCSD_SdCardFSDirExample_Out.
Regards
Vasanth