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GATE 2024 Computer Organization & Architecture Foundation Quiz 80

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Question 1

Consider the following μ-program:

I₁: MAR ← IR [Addr]

I₂: MBR ← M[MAR]

I₃: ALU → MBR

Which of the following operation is performed by the above μ-program?

Question 2

The microinstructions stored in the control memory of a processor have a width of 36 bits. Each microinstruction is divided into 3 fields: a microoperation field of 18 bits, a next address field(X) and a MUX select field (Y). There are 32 status bits in the inputs of MUX.

How many bits are there in the X and Y fields, and what is the size of the control memory in number of words?

Question 3Multiple Correct Options

Consider the following statements:

S₁: In the horizontal microprogrammed control unit, the control signals are expressed in the decoded binary format.

S₂: No external decoder is needed to generate the control signals in the horizontal microprogrammed control unit.

S₃: External decoders are needed in the vertical microprogrammed control unit to generate control signals.

Which of the following is/are correct?

Question 4

The CPU clock frequency is 2 MHZ Program takes 2 million cycles to execute. What is the CPU time in seconds?

Question 5

Consider the following statements:

S₁ : 3 control signals are needed for memory data register.

S₂ : The main advantage of direct mapping is that the cache hit ratio increases drastically if two or more frequently used blocks map onto same block.

Which of the following option is correct ?

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GATE & PSU CS Computer Organization and Architecture

May 31GATE & PSU CS