Im am already using succesfully MMC cards in an embedded device. I like to use SD cards too (bigger memory). I do not need any fancy functions, just the MMC compatible SPI mode. Unfortunately I can't find enough information on the SD card command set. How can I initialise the SD card to work is the MMC compatible mode? What ACMD41 exactly is?
Please point me to the right direction...
The SDCard organization controls the specifications for SD cards. There is some information on their website
If you are supporting MMC SPI mode, SD will require only a connector change to handle the slightly taller card size from a hardware standpoint. From a software standpoint I don't know all the differences. I purchased the SDDK-05 development kit from SanDisk to handle the SPI driver and FAT16 file system.
Nathan Agfa NDT Inc.
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AFAIK this is true only if you actually use the security features on the disk. You don't need an agreement to use the SD disk in the same way as you use an MMC disk.
Your SD disk supplier should be able to give the SD disk spec to you - minus the documentation of the security features.
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