GATE | GATE CS 2018 | Question 35

Consider the following processor design characteristics.

I. Register-to-register arithmetic operations only
II. Fixed-length instruction format
III. Hardwired control unit

Which of the characteristics above are used in the design of a RISC processor?

(A) I and II only
(B) II and III only
(C) I and III only
(D) I, II and III


Answer: (D)

Explanation:

  • The RISC design philosophy generally incorporates a larger number of registers to prevent in large amounts of interactions with memory.
  • The decision of RISC processor designers to provide simple addressing modes leads to uniform length instructions, so RISC instruction is of uniform fixed length.
  • In the hardwired control unit, the control units use fixed logic circuits to interpret instructions and generate control signals from them. It is significantly faster than its counterpart but is rather inflexible. Most of the RISC processors are based on the hardwired control unit design approach.

So, all given characteristics are used in the design of a RISC processor.
Option (D) is correct.


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