A micro instruction format has microoperation field which is divided into 2 subfields F1 and F2, each having 15 distinct microoperations, condition field CD for four status bits, branch field B R having four options used in conjunction AD with address field . The address space is of 128 memory words. The size of micro instruction is :
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Correct answer: A. 19
Explanation
Each of F1 and F2 needs 4 bits (15 operations plus no-op); CD selects 4 conditions (2 bits); BR has 4 options (2 bits); AD addresses 128 words (7 bits). 4 + 4 + 2 + 2 + 7 = 19.
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