FCLK Cortex clock of STM32F411CE microcontroller

[Mykola_Levun]

Hello,

STM32F411CE microcontroller.
What is FCLK Cortex clock for the STM32F411CE microcontroller (see Figure 1 below from the STM32CubeMX (Clock Configuration tab))? Is this clock related to processor clocking? As far as I know, the processor is clocked from the AHB bus.
    Figure 1:

 

[TDK]

FCLK is the clock driving the Cortex M4 core.