Quartus

No valid register-to-register paths exist for clock <name>


CAUSE: The specified clock does not drive any registers which are fed by other registers. No fMAX can be calculated. Note that all paths between registers controlled by different unrelated clocks may not be valid if the Cut paths between unrelated clock domains option is turned on.
ACTION: Check your design for register-to-register paths for the specified clock if this condition is unexpected. Check the project timing requirements to see if the Cut paths between unrelated clock domains option is turned on.

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