SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
The R5FSS has four clock inputs:
CPU0_CLK and CPU1_CLK are the clocks for all of the internal CPU logic. They are provided separately so that:
CPU0_ICLK and CPU1_ICLK are the clocks for all of the interfaces for their associated CPU (for example: VBUSM and VBUSP bridges, exception generation, debug and trace logic). They are provided separately so that CPU1_ICLK can be gated if CPU1 is in a lower power state, while CPU0 is ON, or when in lock mode.
The interface clock is an integer ratio of the CPU clock. See R5FSS Integration.