From: "Eric Smith" <eric_at_brouhaha.com>
Sent: Wednesday, February 02, 2005 6:48 PM
> jpero wrote:
>> What kind of protocol that MMC talks in serial fashion?
>
> MMC protocol, which is a synchronous serial protocol. At the
> electrical and timing level it is similar to SPI and Microwire, but
> the command set and such are AFAICT not derived from anything else.
>
> If I'm not mistaken, a PDF file of the MMC specification used to be
> publicly available at
> http://www.mmca.org/
> but I can't find it there now. :-(
>
> Apparently they have now added 4-bit and 8-bit wide interface modes
> and higher clock rates (up to 52 MHz) to the latest version of the
> standard, probably in response to the SD card specification which
> allows 4-bit wide 25 MHz operation. However, it appears to me that
> SD has almost completely displaced MMC in the market, so I'm a bit
> skeptical that these new MMC modes are going to wind up in many
> products.
>
> Eric
Here are the pages I used:
http://www.mmca.org/tech/MMC-System-Summary-v3.31.pdf
http://www.sdcard.org/sdio/Simplified%20Physical%20Layer%20Specification.PDF
http://www.sandisk.com/pdf/oem/AppNoteMMCQAv1.0.pdf
http://www.sandisk.com/pdf/oem/AppNoteMMC_SDv1.0.pdf
Randy
www.s100-manuals.com
Received on Wed Feb 02 2005 - 19:25:41 GMT