Difference between revisions of "MMC/SD"

Revision as of 13:50, 9 May 2008 (view source) JeanBaptisteMa (Talk | contribs) (→‎microSD/TransFlash:) ← Older edit		Revision as of 15:30, 18 May 2008 (view source) JulienB (Talk | contribs) (→‎Links) Newer edit →
Line 123:		Line 123:
	<br>		<br>
−	[[Image:FrenchFlag.png]] [[Fr:MMC/SD|Page en français]]	+	{{LanguageBar|MMC/SD|MMC/SD|MMC/SD}}
		+
		+	[[Category:Hardware]]
	[[Category:MassStorage]]		[[Category:MassStorage]]

---

Revision as of 15:30, 18 May 2008

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 "fucking slow & error prone" SPI mode.

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.

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:

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

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)	Comments
Sandisk 512 Mbytes	working	3330 / 320	VFAT
Sandisk 1 Gbyte	working	3355 / 130	VFAT
Dane-Elec 1 Gbyte	working	3415 / 130	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

• How to use MMC/SD

Other languages:
English  •  Français