The QSPI bus clock (CLK_QSPI_APB) can be enabled and disabled in the Main Clock
module, and the default state of CLK_QSPI_APB can be found in the Peripheral Clock
Masking section in the MCLK chapter.
An AHB clock (CLK_QSPI_AHB) is required to clock the QSPI. This clock can be
enabled and disabled in the Main Clock module, and the default state of CLK_QSPI_AHB can
be found in the Peripheral Clock Masking section in the MCLK chapter.
A FAST clock (CLK_QSPI2X_AHB) is required to clock the QSPI. This clock can
be enabled and disabled in the Main Clock module, and the default state of
CLK_QSPI2X_AHB can be found in the Peripheral Clock Masking section in the MCLK chapter.
This clock is derived from the High-Speed Clock Domain (HS Clock Domain, frequency
fHS). Figure 37-2. QSPI Clock
Organization
Important: The
CLK_QSPI2x_AHB must be 2 times faster to CLK_QSPI_AHB when the QSPI is operated in
DDR mode. In SDR, the CLK_QSPI2x_AHB is not used.
CLK_QSPI_APB, CLK_QSPI_AHB, and CLK_QSPI2X_AHB, respectively, are all
synchronous, but can be divided by a prescaler and may run even when the module clock is
turned off.
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