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UGC NET Computer Science Dec 2018 (Paper II)

A computer uses a memory unit with $256K$ words of $32$ bits each. A binary instruction code is stored in one word of memory. The instruction has four parts: an indirect bit, an operation code and a register code part to specify one of $64$ registers and an address part. How many bits are there in the operation code, the register code part and the address part?

Solution

Memory size is

$256K=256\times 1024=2^8\times 2^{10}=2^{18}$ words

So, address part requires

$18$ bits

Number of registers is

$64=2^6$

So, register code requires

$6$ bits

Instruction size is

$32$ bits

Indirect bit requires

$1$ bit

So, operation code bits are

$32-1-6-18=7$

Therefore, operation code, register code and address part are

$7,6,18$

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