12?

Dark Mode

1 vote

It means that there are total 64 control signals available in the Control Unit, and there are two groups considered here. One group will have either none or one control signal from the given 64 signals. The other group can have at most 6 control signals from the remaining 63 signals, if the previous group used one signal, or from 64 signals, if the previous group didn't use any signal.

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Group 1:-

64 Control signals are there out of which only one or none of them is active therefore number of bits required for decoder is **(vertical micropogramming) 6 bits.**

Group 2:-

In worst case remaining there will be 63 control signals and condition is atmost 6 control will be active from the remaining therefore (if we will go through horizonal microprogramming we will require 63 or 64 bits ) if we go through **vertical microprogramming** 6 bits are required for 1 control signal to be active therefore for atmost 6 control signal to be active **6*6 bits(36 bits)** require

**6+36=42 bits**

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