Lpc2000

Isn't all of the information (with the exception of the cryptography 
details) available publicly for SD?  I know that the interface 
specifications, protocols and commands for implementation of SD are 
pretty widely available.

What is it that this expensive SDIO membership gets you?



--- In lpc2000@yahoogroups.com, Rob Jansen <rob@m...> wrote:
>
> 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
>