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The control field of 1-address control word has to support 2 groups of control signals.In the group-1 it is requires to generate either 1 or none of the 63 control signals.In the group-2 at most 4 from the remaining.What will be the minimum no. bits needed for control field.

option (A) 6

option (B) 10

option (c) 67

option (D) 81.
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Question is combination of both vertical and horizontal micro programming...

1 or non of 63  vertical microprogramming... So takes 6 bits...

At most 4..means  horizontal... So takes 4bits

Total= 10 bits required...
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In group either 1 or none of 63 signals so this requires 1+6=7 bits in group 2 atmost 4 so these requires 3 bits so control word consists of 10 bits ans is b

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