Shared Pin Mapping for SD Card and NAND Flash Interfaces on MPU
I am using this MPU SOM Module and this NAND Flash device for storing the boot image. I will also use a 4-bit SD card interface with the MPU for data logging.
I’m reviewing the MPU datasheet (link above) and have some confusion regarding the pin mapping for the SD card and NAND flash interfaces.
On page 34 (Figure 4-20), the interface between the SOM and the SD card shows that the SOM’s PA[0:5] pins are used for the SD card connection.
However, on page 38 (Figure 4-27), the interface between the NAND flash and the MPU also shows the same PA[0:5] pins being used.
I also checked section 4.6.3 (page 37), which mentions that NAND should be connected using the NAND controller pins.
This has left me confused — should the NAND flash and SD card really share the same PA[0:5] pins? Which pins should actually be used for the NAND and which for the SD card?
0 comment threads