Difference between 3,3 V MMC and dual (1,8/3,0) volt MMC ?

[Bart]

Does someone know if there is a difference in the SPI initialising of both MMC ?

It seems I can initialize the real MMC ( on 3,3 volt) cards (tested with a 8 MB and a 32 MB) but not the dual volt MMC (62MB Nokia)

Aren't the dual volt MMC's not fully compatible with the 3,3 volt cards ?

Thanks for the reply's
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[asmallri]

Yuu can download the spec for free at: http://www.mmca.org/compliance/buy_spec/MMCA_System_SummaryV41.pdf

The cards present a bit map corresponding to the voltage ranges they operate over. A host during initialization, specifies the range it is operating at using the bit map. If the card is not happy it disconnects.

I have tested cards from about 10 different manufacturers and have not had to do this yet.
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