Answer:
A. 3 bits required
B. 6 bits are required
c. 8 bits are required
d. 15 bits are required
Explanation:
A. In the address mode selector, we need to specify 1 out of 7 addressing modes. Therefore, there must be 3 bits (2³ = 8)
B. There are 60 address registers. Therefore the bits to represent 60 numbers are 6 bits. (2^6 = 64)
C. As indicated, the memory bit word required is 8 bits.
D. Total Bits = Opcode + Address mode + Register Add + Memory ADD
32 bits = Opcode+ 3 bits + 6 bits + 8 bits
Opcode = 32 bits - 17 bits = 15 bits.
Therefore 15 bits are required for Opcode field.