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What is DDR HSSPI (High Speed SPI) Controller used for?
DDR HSSPI Controller is used to interface with Quad SPI flash memory that stores large amount of data like as image or sound contents. DDR HSSPI of S6J3xxx series provides various operating modes for interfacing to serial peripheral devices that use the de-facto standard SPI protocol.
For more details, see the "DDR High Speed SPI Controller" section in the following documents.