Datasheet

DS10198 Rev 8 59/270
STM32L476xx Functional overview
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3.36 Quad SPI memory interface (QUADSPI)
The Quad SPI is a specialized communication interface targeting single, dual or quad SPI
flash memories. It can operate in any of the three following modes:
• Indirect mode: all the operations are performed using the QUADSPI registers
• Status polling mode: the external flash status register is periodically read and an
interrupt can be generated in case of flag setting
• Memory-mapped mode: the external Flash is memory mapped and is seen by the
system as if it were an internal memory
The Quad SPI interface supports:
• Three functional modes: indirect, status-polling, and memory-mapped
• SDR and DDR support
• Fully programmable opcode for both indirect and memory mapped mode
• Fully programmable frame format for both indirect and memory mapped mode
• Each of the 5 following phases can be configured independently (enable, length,
single/dual/quad communication)
– Instruction phase
– Address phase
– Alternate bytes phase
– Dummy cycles phase
– Data phase
• Integrated FIFO for reception and transmission
• 8, 16, and 32-bit data accesses are allowed
• DMA channel for indirect mode operations
• Programmable masking for external flash flag management
• Timeout management
• Interrupt generation on FIFO threshold, timeout, status match, operation complete, and
access error
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