8.4.1 Description

The Quad Serial Peripheral Interface (QSPI) is a synchronous serial data link that provides communication with external devices in Host mode.

The QSPI allows the system to execute code directly from a serial Flash memory (XiP) without code shadowing to RAM. In the system, the mapped serial Flash memory is seen as any other memory.

With the support of the Quad SPI protocol, the QSPI allows the system to use high-performance serial Flash memories which are small and inexpensive, instead of larger and more expensive parallel Flash memories.

The QSPI can be used in SPI legacy mode to interface to serial peripherals such as ADCs, DACs, LCD controllers, CAN controllers and sensors using register accesses, or in Serial Memory mode to interface to serial Flash memories or other devices in an automated way.

Note: Stacked devices with a rollover in the memory address space at each die boundary are not supported.