Difference between revisions of "MMC/SD"

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(Adapter board)
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[[Image:MMC_Adapt.jpg|thumb|center|Top view, connector on the left]]
 
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Signals name (Top view with MMC connector on the right):
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Signals name (Top view with MMC connector on the right):[[Image:MMC_Adapt_pinout.jpg|thumb|Left|]]
 
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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.

Top view, connector on the left
Signals name (Top view with MMC connector on the right):
MMC Adapt pinout.jpg
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:

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


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