Difference between revisions of "MMC/SD"

Revision as of 13:20, 23 June 2007 (view source) JulienB (Talk | contribs) (→‎Adapter board) ← Older edit		Revision as of 18:01, 23 June 2007 (view source) JulienB (Talk | contribs) (→‎Adapter board) Newer edit →
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Revision as of 18:01, 23 June 2007

How-To connect an MMC/SD adapter to the APF9328 (through DevLight board)

For instructions on how to use MMC/SD on Linux, see MultiMediaCard page.

Adapter board

We have designed a small adapter board with a push-pull MMC/SD connector on it. You need to connect the signals listed in the table below to the corresponding one on your DevLight board. The WP and CD_SW signals are optional and must be connected to free i.MXL GPIOs, if used.

Signals name (Top view with MMC connector on the right):

Adapter Pin	Desc	Adapter Pin	Desc
1 (square)	+3.3V	2	SD_DAT2
3	SD_CMD	4	SD_DAT3
5	SD_CLK	6	SD_DAT0
7	WP (option)	8	SD_DAT1
9	CD_SW (option)	10	GND

Remarks:

• Pin 1 (rectangular/square pad)
• WP: write protect
• CD_SW: Card Detect switch

If you don't want to buy such an adapter or don't have a MMC slot (and are a hacker ;-) ), you can stil try this link:

• http://www.hackaday.com/2006/09/12/floppy-connector-mmc-card-slot/

Supported Cards

Here is a list of the current cards which were tested:

MMC

• Hama 256MB -> OK

MMC+

• Kingston 256MB -> OK

SD:

• Kingston 512MB -> OK in 1bit mode. need more tests in 4 bits mode
• Kingston 256MB -> OK
• Dane-Elec 2GB -> OK in 1bit mode. doesn't work : Card recognized but partition table not found in 4bits mode
• Transcend 2GB (x150) -> OK
• Sandisk 512MB -> OK ( formating failure may happen sometimes. workaround: retry )

miniSD:

• Dane-Elec 1GB -> doesn't work : Card recognized but partition table not found.

uSD/Transflash:

• Sandisk 512MB -> OK in 1bit mode. recognized but data tranfer is failing when accessing partition table (bad CRC) in 4bits mode

Links

• http://elm-chan.org/docs/mmc/mmc_e.html

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