Lpc2000

Tom,

>I'm getting really confused here.  AFAIK: MMC cards you can purchase 
>don't have the encyrpto capabilities.   While Secure Digital card can 
>have encrypted data, but also can behave as an MMC protocol card.  While 
>I also understand that pure MMC cards do exist, they are becomming very 
>very hard to find???
>
>Here comes the confusion on my part: If I have a Secure Digital / MMC 
>card that is working with my system, but I don't have the encryption 
>information to do the security mode: isn't this, in fact, an MMC Card?
>  
>

I can only tell you if you sign your life away ...

SD originated from MMC on top of MMC it contains 4 bit mode and encryption.
To distinguish between SD and MMC there are some differences; the SD 
card is thicker than MMC (so you can never put an SD card in a pure MMC 
slot) and the initialization is different.
As far as I know they both share the same SPI mode commands, but I have 
to get this from the specs since I only used the real MMC/SD modes on 
LPC3000 and other ARM variants.
All basic commands for reading and writing from the card are the same 
and result in the same responses. SD has extra commands for security and 
SDIO and MMC has some extra commands for a streaming mode.

Originated from the same source, MMC and SD are changing into different 
directions.
MMC is now also coming with more bits (up to 8 bits) and a higher clock 
frequency (52 MHz).

Having told you this, your life not only belongs to Bill Gates but also 
to me :~)

Rob