I know there are some threads related to this topic, but I want to be sure I get the correct answer.
I have 20 CM3 Modules that I would like to repurpose for a new project. This project requires I2C, SPI, WiFi (SDIO), Bluetooth (UART), a second UART for programming a MCU, and a SD Card for large file storage.
My issue is with SD. I have read that SD0 is used by the CM3 for eMMC, is this correct or does it use the SDX pins which are all marked as NC for the CM3? If this is the case, does this leave both SD0 and SD1 on the GPIO open for use, or is SDX still using SD0?
If SDX is SD0, then I will have to use a On Semi FSSD06 (http://www.onsemi.com/PowerSolutions/pr ... ?id=FSSD06) to multiplex SD1. I just wanted to check double check before I spend the time creating a footprint, symbol and MCAD for an FSSD06 multiplexer. However, this limits it to using WiFi or the SD card; both can not be used simultaneously with any multiplexer I've found.