Discussion
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)
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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