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Module 2: x86 Architecture, CPU Control, I/O, Memory System Design

20232m

A micro programmed control unit:
(i) Is faster than a hardwired control unit
(ii) Facilitates easy implementation of new instructions
(iii) Is useful when every small program is to be run
(iv) Usually refers to the control unit of the microprocessor

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Answer: (ii) Facilitates easy implementation of new instructions

Explanation:

  • Microprogrammed CU stores control signals as microinstructions in control memory (ROM). New instructions added by updating microcode - flexible, easy to modify.
  • Not faster than hardwired: hardwired is faster (combinational logic); microprogrammed is slower due to control memory access (so (i) is false).
  • (iii) and (iv) are incorrect descriptions.

Hence microprogrammed CU's advantage = easy extensibility/modifiability.

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