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Ne4ueva [31]
3 years ago
8

)What are the approaches used to design a Control unit? Brieflycompare them.

Computers and Technology
1 answer:
Tema [17]3 years ago
8 0

Answer: Control unit is the main unit of CPU which is responsible for handling of the processor's control action. There are two  ways to design a control unit :-

  • Hardwired control unit
  • Micro-programmed control unit

Explanation: Comparison of the two control units are as follows:-

  • Hardwired control is comparatively rapid than the micro-programmed control .
  • Hardwired control is circuit type technology and micro-programmed control is software type technology.
  • Hardwired control is based on the RISC architecture and micro-programmed is based on CISC architecture.

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Suppose a program contains 500 million instructions to execute on a processor running on 2.2 GHz. Half of the instructions takes
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Answer:

1.48 s

Explanation:

Number of instructions = 500 million = 500 * 10⁶

clock rate = 1 / 2.2 GHz = 1 / (2.2 * 10⁹ Hz) = 0.4545 * 10⁻⁹ s

We need to compute the clocks per instruction (CPI)

The CPI = summation of (value * frequency)

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CPI = (0.5 * 3) + (0.5 * 10) = 1.5 + 5 = 6.5

Execution time = number of instructions * CPI * clock rate

Execution time = 500 * 10⁶ * 6.5 * 0.4545 * 10⁻⁹ =1.48 s

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