The i.MX6 SL has two voltage suppliers : NVCC33_IO and NVCC18_IO.
The bit LVE in corresponding Pad Control Register defines what voltage will be
applied to the pin. Default value VLE=0 means 3.3V.
The i.MX6 SL has special recommendations, when using so called low voltage
design, in particular it relates to 1.8V SD cards. Please refer to section 7.2.4 (Power-up
sequence in low voltage system design) of the “Hardware Development Guide for i.MX
6SoloLite - User Guide”
http://cache.freescale.com/files/32bit/doc/user_guide/IMX6SLHDG.pdf
The i.MX6 D/Q/S/DL do not have ability to switch SD voltage internally.
An external scheme (power voltage switch or level translator) should be used.
Best regards
Yuri
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