The microprogrammed control organization has the following propagation delay times. 40 ns to generate the address, 10 ns to transfer the address into the control address register, 40 ns to access the control memory ROM, 10 ns to transfer the microinstruction into the control data register, and 40 ns to perform the required micro-operations specified by the control word. What is the maximum clock frequency that the control can use? What would the clock frequency be if the control data register is not used?