We currently use a microSD with a microcontroller in SPI mode. I was wondering if I could use the Quad-SPI (SMIF) component of the PSoC 6 to speak to the card faster, while also having the option of encrypting the data on it.
Unfortunately, you can't use SMIF for faster communication with the SD card. SMIF is incompatible with the SD modes supported by the card. Since PSoC 6 doesn't support SDIO interface at the moment, please continue using the single-SPI mode.