> IIRC 4-bit mode isn't an open standard. I don't think it's reasonable
> to achieve it without specialized hardware even if you can get the
> spec

The spec papers from www.sdcard.org do provide some information
which controllers *should* adhere to, so you can back-engineer to
some extent

> This would probably mean you need an FPGA, or to use a microcontroller
> with an SD card port. I've never seen one, myself.

This is probably blurring the line between microcontrollers and
microprocessors

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=3DMPC5121e

I found AN3805 a few weeks ago when Googling for SDHC How-Tos.
Not useful at the time because I didn't understand enough of the basics

Joe
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