MMC

(Difference between revisions)

Revision as of 06:30, 9 June 2007

MMC = MultiMedia Card.

MMC card

MMC has been superseeded by MMCplus. Which is backward compatible with MMC, but has 13 pins instead of 7. Developed by Siemens and SanDisk in 1997.

Size is 32 x 24 x 1.4 mm.

Pin	Name	Dir	Description
1	RSV		Reserved for future use
2	CMD	^{PP) OD)}	Data In
3	VSS		Supply voltage ground
4	VDD		Supply voltage
5	CLK		Clock
6	VSS		Supply voltage ground
7	DAT	^PP)	Data

Note: Direction is memory card relative to host.

^PP) Push-pull.
^OD) Open-drain.

Pin	Name	Dir	Description
1	CS		Chip Select
2	DI	^PP)	Data In
3	VSS		Supply voltage ground
4	VDD		Supply voltage
5	CLK		Clock
6	VSS		Supply voltage ground
7	DAT	^PP)	Data Out

Note: Direction is memory card relative to host.

^PP) Push-pull.

MMC v1.0 (September 1996)
MMC v2.11 (June 1999)
- SD Card based on this standard
- MMC v3.31 (May 2003)
- Dual Voltage Cards
MMC v4.x (April 2005)
- Smaller form factor
- Larger bus (4 or 8 bits)
- Faster bus (26MHz or 52MHz)
- SecureMMC
- MMCplus (> 4GB)
eMMC (December 2006)

@@ Line 3: / Line 3: @@
 MMC has been superseeded by [[MMCplus]]. Which is backward compatible with MMC, but has 13 pins instead of 7.
+Developed by Siemens and SanDisk in 1997.
 Size is 32 x 24 x 1.4 mm.
@@ Line 53: / Line 54: @@
 <sup>PP)</sup> Push-pull.
+== History ==
+* MMC v1.0 (September 1996)
+* MMC v2.11 (June 1999)
+** SD Card based on this standard
+** MMC v3.31 (May 2003)
+** Dual Voltage Cards
+* MMC v4.x (April 2005)
+** Smaller form factor
+** Larger bus (4 or 8 bits)
+** Faster bus (26MHz or 52MHz)
+** SecureMMC
+** MMCplus (> 4GB)
+* eMMC (December 2006)
 == Related connectors ==
@@ Line 61: / Line 76: @@
 == Sources ==
 * [http://www.kingmaxdigi.com/product/MMC.pdf Kingmax Digital Inc's MMC datasheet]
+* Presentation about [http://www.bsdcan.org/2007/schedule/attachments/23-freebsd-sd-warner-losh.pdf FreeBSD's SD/MMC Implementation] by Warner Losh
 [[Category:Connector]]
 [[Category:Memory]]