Hi Patrick

You have pointed out a documentation error at www.gumstix.com of the signals on the 40-pin header. The information is now corrected.

The MMC/SD/SDIO interface signals are not available on the 40-pin header, only on the 60-pin header.

Gumstix will contact you off list.

Don Anderson
@ Gumstix

On Thu, Nov 18, 2010 at 5:59 AM, Patrick Maheral <pmaheral@dragonwaveinc.com> wrote:
I posted this message a while back, but just realized I forgot to set the "Subject" line.
I'm working on a project that uses an Overo Fire COM and Chestnut43 with an LCD, and we would like to add an MMC/SD card slot to our device.  The Chestnut43 overview (http://www.gumstix.com/store/catalog/product_info.php?products_id=237&show_tab=overview) suggests that the required signals are available on the 40-pin header:
Forty (40) signals available on 0.100" through-holes at 1.8V logic
Two (2) two-wire serial ports
One 1-wire port
6 PWM lines
I2C port
SPI bus
6 A/D input lines
MMC/SD/SDIO interface
processor control signals
However, I do not see these signals explicitly listed on the 40-pin header webpage: http://www.gumstix.net/Documentation/view/I/O-connectors-cabling/Gumstix-Summit-board-40-pin-header-SV1/112.html
and after looking at the schematic and layout, it appears that the MMC3 signals are not routed on the Chestnut43.
Is there an error in the Chestnut43 description, or are some of the signals on the 40-pin header muxed with MMC/SD signals and simply not labeled as such.
Assuming the description is correct, what pins can be used to connect to an MMC/SD card?

Beautiful is writing same markup. Internet Explorer 9 supports
standards for HTML5, CSS3, SVG 1.1,  ECMAScript5, and DOM L2 & L3.
Spend less time writing and  rewriting code and more time creating great
experiences on the web. Be a part of the beta today
gumstix-users mailing list