signal for controlling the power supply (SD_VDD) to the SD slot

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signal for controlling the power supply (SD_VDD) to the SD slot

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ko-hey
Senior Contributor II

Hi all

It is a question for the reference design.
Schematic file name: SPF-28616_C2.pdf
Target page: page 12

As a result of checking the circuit, the signal for controlling the power supply (SD_VDD) to the SD slot was added to SD1_nRST and POR_B.


Could you tell us why you need POR_B for SD power control ?

Ko-hey

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Yuri
NXP TechSupport
NXP TechSupport

Hello,

   The POR_B provides also SD card and interface reset so that both i.MX6 and SD card

were in predefined (after reset) state. This allows to avoid issues when SD continues its

previous operation during attempts of i.MX6 to initialize SD (eMMC).  

  Also, please take a look at   https://community.nxp.com/message/469357 

Have a great day,
Yuri

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