Hi Alexey, The following is from page 113 , section 7.1 of "Physical Layer Simplified Specification Version 3.01" from the SD Group and SD Card Association: "The commands and functions in SD mode defined after the Version 2.00 are not supported in SPI mode. The card may respond to the commands and functions even if the card is in SPI mode but host should not use them in SPI mode." I interpret this as some SDXC cards might work in SPI mode but there is no guarantee that all SDXC cards will work in SPI mode. I don't get a "warm and fuzzy" feeling that I can guarantee that there won't be angry customers because they bought the "latest and greatest" SDXC card and it doesn't work in the product. I have looked at some of the newest eMMC giant flash chips and they specifically say they do not support SPI mode. (I'll attach a data sheet if you want). My guess is that the latest "huge" eMMC flash chips are designed to go into an SD card and the SD card simply brings the chip pins out to connector pins, single chip SD card. Marty www.linkedin.com/pub/martin-risso/71/599/a09
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