To generate clock in sync with the link-partner (recovered clock of 125MHz or 25MHz) on the CLKOUT pin of DP83867 :
- program register 0x0170[12:8] = 00000 for 125MHz
- program register 0x0170[12:8] = 00100 for 25MHz
Note : Once programmed as above, PHY will generate the required clock frequency. It will be in sync with the link-partner only after the link is up.
Note : Jitter cleaner may be required if measured jitter is more than the end application's requirement.