Difference between revisions of "MMC/SD"

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Revision as of 20:32, 1 August 2010

Hardware details on How-To use MMC/SD/microSD cards on APF boards. For APF9328 DevLight you will learn how to connect an MMC/SD adapter/connector.

SDCard, MiniSD, and Transflash/MicroSD are all the same devices but in different package shapes and are all pin compatible.
On Armadeus boards, MMC are controlled in 1 bit MMC mode and SD/MiniSD/MicroSD in 4 bits SD mode. We don't use MMC/SD in slow & error prone SPI mode.

Note Note: For instructions on how to use MMC/SD on Linux, see the MultiMediaCard page. (Here you will only find hardware details)


Adapter board (for APF9328DevLight 1.0 or your custom 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 still try this link:

On an APF9328DevFull board, there is already a MMC/SD connector

So nothing special to do.

On an APF9328DevLight 2.0 or an APF27Dev board, there is already a microSD connector

So nothing special to do.

Supported Cards

Here is a list of the current cards which were tested. Speeds are rounded to the nearest multiple of 5:

MMC

Model Status Speed in kB/sec (read/write) Comments
Hama 256 Mbytes working 895 / 455 Ext2

MMC+

Model Status Speed in kB/sec (read/write) Comments
Kingston 256 Mbytes working NA

SD:

Model Status Speed in kB/sec (read/write) Comments
Kingston 512 Mbytes working 3275 / 155 Ext2
Kingston 256 Mbytes working NA
Dane-Elec 2 Gbytes KO NA OK in 1bit mode. doesn't work : Card recognized but partition table not found in 4bits mode
Transcend 2 Gbytes (x150) working NA
Sandisk 512 Mbytes working NA formating failure may happen sometimes. Workaround: retry
Panasonic 16 Mbytes working NA Ext2

MiniSD:

Model Status Speed in kB/sec (read/write) Comments
Corsair 1Gbytes working 3330 / 365 VFAT
Sandisk 1Gbytes working 3300 / 295 Ext2
Sandisk 512Mbytes working 2750 / 215 VFAT
Transcend 512Mbytes not recognized NA
Extreme Memory 512Mbytes not recognized NA
Dane-Elec 1Gbytes doesn't work NA Card recognized but partition table not found

microSD/TransFlash:

Model Status Speed in kB/sec (read/write)
APF9328 | APF27
Comments
Sandisk 512 Mbytes working 3330 / 320 NT / NT VFAT
Dane-Elec 1 Gbyte working 3415 / 130 NT / NT VFAT
Sandisk 1 Gbyte working 3355 / 130 NT / NT VFAT
Sandisk 2 Gbyte Not recognized NA / NA NT / NT NA
Kingston 1 Gbyte working 3355 / 130 NT / NT VFAT
Kingston 2 Gbyte working 3355 / 130 NT / NT VFAT
EMTEC 2 Gbyte working 3232 / 1548 NT / NT EXT2
Kingston 4 Gbyte working 3355 / 130 NT / NT VFAT
Transcend 4 Gbyte
SDHC Class 6
working 3379 / 2668 7315 / 3805 VFAT for APF9328 test; EXT3 for APF27 one

Test method

Use test script (media_perf.sh) located in armadeus/target/test/mmc/. Install Armadeus TestSuite and then launch it:

# cd /usr/bin/testsuite/
# media_perf.sh speed

Links