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Question, changing eMMC power supply voltage, i.MX6SX

Question asked by Masamichi Miyamoto on Jun 1, 2017
Latest reply on Jun 11, 2017 by Wigros Sun

Dear team,


I would like to ask about eMMC power supply connected to i.MX6SX.

My customer plans to use i.MX6SX, and they want to add a feature of changing eMMC operation voltage 3.3/1.8V on their proto-board.

Could you show me whether any problem in the following idea?

They believes that they can connect SDx_VSELECT pin of i.MX6SX to Power switching IC, and Power supply flows out from the Power Switching IC can be connected to NVCC_SDx of i.MX6 and to VCCQ pins of eMMC.

Please find the attached file for the diagram.

(1) Is the above correct?

(2) And could you show me whether they can use GPIO pin instead of SDx_VSELECT pin in the above?


They want use SD3 or SD4 port for the eMMC connection, but they find there is no VSELECT pad for SD3 port. In the case of using SD3 port for eMMC connection, is it possible to use GPIO pin (like using SD4_SELECT for SD4 port) to change the power supply voltage of eMMC for selecting voltages?