Microprogrammed Control Questions and Answers

Q: Individual control words in a micro-programmed control unit is known as :

Each control word is called a Micro-instruction.In a micro-programmed control unit, the control signals for one step are stored as a word in control memory; each such control word is a micro-instruction. A sequence of micro-instructions forms a micro-program, and the group of micro-instructions that carries out one machine instruction is a micro-routine.So micro-routine and micro-program describe collections of control words, not individual ones, and 'micro-word' is not the standard term.

Q: A horizontal micro-programmed control unit supports the following. Identify the correct ones.(i) Longer control word(ii) Used in parallel processing applications(iii) Allows high degree of parallelism(iv) Requires no additional hardware (decoders)

All four are correct: (i), (ii), (iii) & (iv).In horizontal microprogramming, each bit of the microinstruction drives one control signal directly. This gives:a long control word, since there is one bit per control signal (i);the ability to activate many micro-operations at once, a high degree of parallelism (iii), which is why it suits high-speed and parallel processing applications (ii);no decoding hardware, because the bits are not encoded (iv).Vertical microprogramming is the opposite: short, encoded control words that need decoders and allow little parallelism. Options leaving out any of the four statements are incomplete.

Individual control words in a micro-programmed control unit is known as :

A.Micro-routine
B.Micro-program
C.Micro-word
D.Micro-instruction

Exam Year(s)

MH SET - 2021, SET Exam - 2021,

Answer: D

Each control word is called a Micro-instruction.

In a micro-programmed control unit, the control signals for one step are stored as a word in control memory; each such control word is a micro-instruction. A sequence of micro-instructions forms a micro-program, and the group of micro-instructions that carries out one machine instruction is a micro-routine.

So micro-routine and micro-program describe collections of control words, not individual ones, and 'micro-word' is not the standard term.

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A horizontal micro-programmed control unit supports the following. Identify the correct ones.

(i) Longer control word
(ii) Used in parallel processing applications
(iii) Allows high degree of parallelism
(iv) Requires no additional hardware (decoders)

A.(i), (ii) & (iii)
B.(i), (iii) & (iv)
C.(i), (ii), (iii) & (iv)
D.(ii), (iii), (iv)

Exam Year(s)

MH SET - 2023, SET Exam - 2023,

Answer: C

All four are correct: (i), (ii), (iii) & (iv).

In horizontal microprogramming, each bit of the microinstruction drives one control signal directly. This gives:

a long control word, since there is one bit per control signal (i);
the ability to activate many micro-operations at once, a high degree of parallelism (iii), which is why it suits high-speed and parallel processing applications (ii);
no decoding hardware, because the bits are not encoded (iv).

Vertical microprogramming is the opposite: short, encoded control words that need decoders and allow little parallelism. Options leaving out any of the four statements are incomplete.

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Microprogrammed Control Questions and Answers

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