djoshi wrote: ↑
Sun Jan 16, 2022 12:53 pm
You are right the 4 bit is for MMC and not SD card. I will be using standard SD cards and I believe a max speed of 80Mhz can be achieved.
MMC has nothing to do with this. 4-bit SPI is for quad-SPI capable devices. This includes NOR flash chips, but not MMC/SD.
But can this also be reduced for on the same SPI I got other device which do not need to fast speed?
I don't get that comment.
As this is a new board, we aim to design it for max performance.
I will be using the SD card as temp storage for Audio and possibly Videos/Photos in the future.
You should use the SDMMC Host peripheral then, not the SPI peripherals. Suggest you read at least the top part of this