Discussion
Which of the following statements is not true with respect to a Hardwired Control Unit in comparison with a Microprogrammed Control Unit ?
Answer: C
The statement that is not true of a hardwired control unit is that it enables a simpler control unit design.
A hardwired control unit generates control signals with fixed combinational logic. It needs no control memory and is faster, but its design is complex for a large instruction set and any change means redesigning the circuit, so it is inflexible.
A microprogrammed unit stores control words in a control memory, which makes the design systematic and simpler to modify. So options A, B and D are true of hardwired control, and C describes the microprogrammed approach.
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