61.4.1.1 QSPI Features
The QSPI Core peripheral is fed with the peripheral clock or QSPI GCLK.
QSPI0 embeds a DLL, enabling QSPI0 to reach 100 MHz on data with a 100-MHz GCLK clock.
QSPI1 needs a 150-MHz GCLK to reach 75 MHz on data.
Refer to Electrical Characteristics for timing extractions in different modes.