I have seen code posted for XMOS processors.
Warnings regarding copyrights and permissions are at the top of the code.
http://github.xcore.com/repo_index/sc_sdcard_readme.html

I'm just beginning to explore these XMOS chips, interesting architecture.

LyleHaze

On 6/21/12, Robert Rolf <Robert.Rolf@ualberta.ca> wrote:
>>
>> As I understand it, the inclusion of a useable SPI mode is just
>> "throwing the amateurs a bone", as you pay for access to 4-bit
>> parallel spec
>>
>
> Has anyone reverse engineered the 4 bit SD/SDHC communications protocol a=
nd
> published it?
> One would assume that it uses the same command set as the SPI mode,  but =
in
> Nybble
> mode (Like LCD's can do 4 bit or 8 bit).
>
> Presumably R/E is allowed so does one also have to buy a license in order
> to use 4 bit mode?
> Of for that matter SPI mode?
>
> R
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