Series resistor of 200 Ohm on SD_CLK

[BuGless]

How is that value of 200 Ohm determined?
What if I'd use 300 Ohm instead; would that work better, worse, equally well? Why not?

[Espressif_Kelly]

Dear BuGless,

The resistor on SD_CLK is for lowering the driving current, decreasing cross-talk and external interruption, adjusting timing sequence, and so on.

200ohm is a reference value and you can adjust it on the situation.

Thanks.