The microprogrammed control organization shown in Fig. 7-1 has the following propagation delay times. 40 ns to generate the next 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 microoperations 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?

Fig. 7-1

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Control 70-0-0-0 address register External input Next - address generator (sequencer) Control memory (ROM) Next-address information Control data register Control word