Quartus

CLK3 or CLK4 pin use is illegal -- these pins cannot drive other logic in APEX 20KE

CAUSE: You used the dedicated clock pin CLK3 or CLK4 to drive logic. In APEX 20KE devices, you can use the CLK3 or CLK4 pin only to drive a global clock signal.
ACTION: Make sure the CLK3 or CLK4 pin drives only a global clock signal.

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