A micro-instruction format has micro-ops field which is divided into three subfields F1, F2, F3 each having seven distinct micro-operations, condition field…
A micro-instruction format has micro-ops field which is divided into three subfields F1, F2, F3 each having seven distinct micro-operations, condition field CD for four status bits, branch field BR having four options used in conjunction with address field ADF. The address space is of 128 memory locations. The size of micro-instruction is :
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Correct answer: (B) 20 bits
Explanation
F1, F2, F3 each with 7 micro-operations need 3 bits each = 9 bits; CD for 4 status bits needs 2 bits; BR with 4 options needs 2 bits; ADF for 128 locations needs 7 bits. Total = 9 + 2 + 2 + 7 = 20 bits.