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Question, eMMC supply voltage change

Question asked by Masamichi Miyamoto on Jun 11, 2017
Latest reply on Jun 23, 2017 by Wigros Sun

Dear team,


I would like to ask about changing supply voltages, 3.3/1.8V, of eMMC with i.MX6SX.

This inquiry is related to the following post.

The customer understand that SD3 or SD4 can be used for eMMC connection and they want to add the feature of supply voltage change of eMMC for their board.

In the case of using SD3 port for connecting to eMMC, my customer has a concern on the deviation of the timing between a changing the voltage of eMMC power supply and a changing i.MX6SX’s internal operation voltage.

If the deviation exists, they believes that SW needs to know when the voltage change has been completed.


Are there any ways to detect the voltage change of eMMC has been actually completed?


In the case of using SD4 port;

Can I understand that the timing deviation such as above does not occur by using SD4_VSELECT pin for changing eMMC voltage?