Re: [Gumstix-users] SDIO interface for connex400xm

[Joel W. <jo...@in...>]

If the MMC host controller can communicate with a SDHC card (which it 
can), then you will have no trouble communicating to an SDIO card.  The 
big limitation you may experience is maximum speed.  I don't know what 
the max speed rating on the PXA255 MMC host controller is, as my Intel 
PXA documents are no where to be found. 

If you use SPI your max clock speed will be your major limitation.  This 
is dependent on what max speed the silicon and pcb design can support.

Read this document, it contains what needs to be added to the current 
WinCE SDHC code to support SDIO:
http://www.sdcard.org/about/sdio/sdio_spec/



Joel Winarske




sriram sista wrote:
>  
> Dear friends,
>                   Can anybody suggest me how to interface with SDIO 
> module for CONNEX400xm.
> I have only one SDIO device to be interfaced.
> 1.PXA255 has support for MMC and SPI. how to use SPI for SDIO???
> 2.What pins from which connector has to be connected????
> 3. Can anybody give me the connection schematic if they already did it.
> 4. Any pullup resistors required???
>  
> Thanks and regards
> sriram
>  
>  
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> ------------------------------------------------------------------------
>
> _______________________________________________
> gumstix-users mailing list
> gum...@li...
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
>