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Control Unit Design Questions and Answers

Answer: A

The statement not expected of the clock is It is not applied to all registers.

In a synchronous CPU, the clock pulses are applied to all registers and flip-flops in the system. Whether a register actually changes on a given pulse is decided by its control signals, such as load or increment enable.

The other options describe what the clock does: it changes register states as the control signals require, it synchronises the activities of the system, and it triggers loading of data into registers or transfers between them.

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2.

Which of the following statements is not true with respect to a Hardwired Control Unit in comparison with a Microprogrammed Control Unit ?

Exam Year(s)

MH SET - 2024, SET Exam - 2024,

Answer: C

The statement that is not true of a hardwired control unit is that it enables a simpler control unit design.

A hardwired control unit generates control signals with fixed combinational logic. It needs no control memory and is faster, but its design is complex for a large instruction set and any change means redesigning the circuit, so it is inflexible.

A microprogrammed unit stores control words in a control memory, which makes the design systematic and simpler to modify. So options A, B and D are true of hardwired control, and C describes the microprogrammed approach.

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3.

The branch logic that provides making capabilities in the control unit is known as

Exam Year(s)

UGC NET - 2012,

Answer: A

The branch logic that gives decision-making capability to the control unit is controlled transfer, as the key has it.

In the control unit, branch logic tests conditions and chooses between sequences of micro-operations. The term used in the textbook for this is controlled transfer. Conditional transfer (B) is a name for a jump taken only if a condition holds, which is a feature of an instruction, and unconditional transfer (C) is a jump taken always, so neither is the logic that gives the unit decision-making capability.

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