Q43.Marks: +2.0UGC NET Paper 2: Computer Science 2020
Given below are two statements:
Statement I: Hardwired control unit can be optimized to produce fast mode of operation.
Statement II: Indirect addressing mode needs two memory reference to fetch the operand.
In the light of the above statements. choose the correct answer from the options given below
1.Both Statement I and Statement II are true✓ Correct
2.Both Statement I and Statement II are false
3.Statement I is correct but Statement II is false
4.Statement I is incorrect but Statement II is true.
Solution
The correct answer is option 1.
Key Points
Control signals are provided by a hardwired circuit in hardwired control techniques. The main goal of the control unit is to produce the control signal in the correct order. The speed of a hardwired control unit can be optimized.
Hence statement I is correct
Indirect addressing mode needs two memory references to fetch operand as the address of the operand is not given in instruction but the address field contains the address where the address of the operand is stored.
Hence statement II is correct.
Additional Information
Advantages of Hardwired Control unit:
It is faster than the microprogrammed control unit.
It can be optimized to produce a fast mode of operation.
Disadvantages of Hardwired control unit:
Instruction set, the control logic is directly implemented.
Requires a change in the wiring if the design has to be controlled.
An occurrence of an error is more.
It requires a more chip area, therefore, it is a costlier control unit.
