The PRCM module, through the local power and clock management inside the ISS, provides a unique PCLK that can be enabled from the ISP5_CTRL register.
The modules inside the ISP require three clocks:
- PCLK: This clock is asynchronous to the other clocks. It is provided by the module sending the data to the IPIPEIF module on the VP. The frequency is up to 532 MHz.
- ISP_FCLK: This clock is sourced from ISS_MAIN_FCLK and is synchronous with the configuration clock domain. This is the clock used for the MTC interface. The frequency is up to 532 MHz.
- GCK_MMR: This is the clock for the configuration bus. It is created from the ISP_FCLK and runs at half the speed of the ISP_FCLK. The frequency is up to 266 MHz.