The SPI peripheral in SC58x will have two distinct modes of operation
-
- Legacy: Communication with SPI device facilitated by Tx & Rx FIFOs which are either MMR or DMA accessed
- Memory Mapped: New mode where communication to a SPI memory device is automated such that the memory it contains is accessible directly through reads of processor address space. Once configured, a SPI memory device will behave similar to an L2 ROM, albeit substantially wait stated due to the overhead and limited bandwidth of the SPI interface.