Virtual Gate Test Series: CO & Architecture - Micro Instruction

Question

A micro control unit is having control word in the following format

It has to generates $46$ control signals. Next address are selected based on $8$ conditional oblique flag information. If the control memory is having $80$ control program of size $8$ words, the size of the control word in horizontal micro-programming is ____bits$?$

I'm getting $61$ also what will be the answer in case of vertical micro-programming.

Answer 1

Horizontal programming:

I)No of control signal =46 so we need 46 bits.// each signal need of one bit.

II)No of flags=8 we need of log8 bits=3 bits.

III)Control program of size=80*8words=640 words .need of 10 bits.

Hence total size of control word=46+3+10=59 bits.

Vertical programming:

Only difference in control signals.it requires less no of control signals compared to horizontal.

It need of log46 bits=6 bits only for control signals.

Hence total of 6+3+10=19 bits.