I want to run my microcontroller with the system clock derived from EXTAL and the RMII clock sourced from ENET_1588_CLKIN. I cannot run with a 50 MHz clock attached to EXTAL due to system requirements.
The KV58 reference manual inlcludes the following contradictory statements:
- RMII clock source is tied to EXTAL:
- Section 51.1.2 states that RMII_REF_CLK is internally tied to EXTAL.
- RMII clock source is configurable:
- Section 6.5.9 and Table 11-26 state that the RMII clock source can be EXTAL or ENET_1588_CLKIN, selected via SIM_SOPT2[RMIISRC].
Which one is it? Can I have the microcontroller system clock derived from EXTAL and have the RMII clock sourced from a 50 MHz clock attached to ENET_1588_CLKIN?