MMC/SD

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How-To connect an MMC/SD adapter/connector to your APF9328

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

Contents

Adapter board (for DevLight 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
Top view, connector on the left
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 still try this link:

On a DevFull board, there is already a MMC/SD connector

On a DevLight 2.0 board, there is already a microSD connector

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 NT / NT VFAT

Test method

Use test script (mmc_perf.sh) located in armadeus/target/test/mmc/. Copy it on your target and launch it:

# mmc_perf.sh speed

Links


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