2398501_en-US

[#1]

S32K344 QSPI Initializations SCLK does not produce the expected value.

I'm using the S32K344 LQFP176 to build a product that accesses QSPI peripherals. We want to make QSPI similar to LSPI in application, not to access FLASH, but to use ordinary devices.

I've configured the clock tree QSPI_SFCK to 20MHz, disabled the relevant FLASH registers, and used a LUT table. During debugging, I observed the LUT executing, but QSPI's SCLK isn't being generated, although ultra-high-speed waveforms are appearing on SD0-SD3. Could you please help me figure out how to use this QSPI to access non-FLASH devices?

Re: S32K344 QSPI Initializes SCLK不按我们希望出来

The S32K344 QuadSPI module is primarily intended as a serial flash memory interface, not as a generic LSPI-like interface for arbitrary QSPI peripherals. The QSPI_SFCK clock configuration only provides the clock source for the QuadSPI module; it does not automatically generate an external SCLK. The external SCKFA signal is generated only as part of a valid QuadSPI command sequence executed by the flash-oriented LUT/IP command engine. Therefore, if the connected device does not follow a flash-like command/address/data protocol, or if the LUT sequence/pin configuration does not match such a transaction, the behavior may not be suitable for this application. For a generic external device, LSPI should be used if the required protocol can be implemented there. If QuadSPI must be used, the external device protocol would need to be compatible with the QuadSPI flash-style transaction model, and the LUT sequence, pin muxing, chip select, command/address/data phases, and IP command trigger need to be checked accordingly.