GATE Computer Science (CS) 2020 Solved Papers

Question : 60 of 65

Marks: +1, -0

A processor has 64 registers and uses 16-bit instruction format. It has two type instruction: I-type and R-type. Each I-type instruction contains an opcode, a register name, and a 4- bit immediate value. Each R-type instruction contains an opcode and two register names. If there are 8 distinct I-type opcodes, then the maximum number of distinct R-type opcodes is _____.

Your Answer:

Validate

Solution:

\Rightarrow

# of instruction possible

=2^{4}=16

∴

No. of free opcodes

=16-x

Let

{x}

is number of R-type instruction existed.

∴

No. of I-type instruction possible

=(16-x) * 2^{2}

8=64-4 x

4 x=64-8=56

x=14

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