About SD Card Power Down

[goto11]

Hello,Community

As shown below, at power down, CLK, CMD and DATA must be logic 0.

For example, if you use SW_MUX_CTL_Register(IOMUXC_SW_MUX_CTL_PAD_SD1_CLK) for ALT0_SD1_CLK and use it as a clock, do you have to perform the following processing at power down?

Or can the program force a logical 0 to be output?

1.Change the allocation to 100kPD(IOMUXC_SW_PAD_CTL_PAD_SD1_CLK).
2. Change the allocation to ALT5_GPIO5_IO3(IOMUXC_SW_MUX_CTL_PAD_SD1_CLK).
3. Assign to input with GPIOx_GDIR.

best regards

Goto

[igorpadykov · Accepted solution]

Hi GoTo

you are right, one can force signals to logical 0 in software

using your sequence.

Best regards
igor
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