35.5.1 SQI Operation

The SQI peripheral is primarily used to communicate with Serial Flash memory devices. The Serial Flash devices support operations such as ERASE, READ, and WRITE through a set of command sequences, which are issued by a host controller, in this case the SQI peripheral. The SQI peripheral facilitates these command sequences through the following prominent interface features:

• Single, Dual, or Quad lane modes
• Single Data Rate (SDR) or Double Data Rate (DDR)speeds
• SPI Mode 0 or Mode3
• DMA, PIO, or XIP transfer modes
• Flash status check
• Tap delays at high interface speeds