Emx sd_pwr

I use it to implement a custom board EMX.
I use SD_PWR the EMX (68 pin) for power supply to the SD card.
The distortion at the timing of writing and observing the waveform.
I have been in accordance with the instructions of your document in the connection.
We are considering also be connected to the SD card from a different power source
Whether there will be any problems with this method?

welcome to the forum. I’d suggest you use the Fez Cobra as the reference circuit and layout for EMX. https://www.ghielectronics.com/catalog/product/131

@ tklksg - You could also power the SD card straight from your power supply instead of using pin 68. Also make sure you have a reasonable decoupling capacitor near the SD card