Hardwired Control Unit
Hardwired control units are implemented through use of sequential logic units, featuring a finite number of gates that can generate specific results based on the instructions that were used to invoke those responses. Hardwired control units are generally faster than microprogrammed designs.
Their design uses a fixed architecture — it requires changes in the wiring if the instruction set is modified or changed. This architecture is preferred in reduced instruction set computers (RISC) as they use a simpler instruction set.
The hardwired approach has become less popular as computers have evolved as at one time, control units for CPUs were ad-hoc logic, and they were difficult to design.
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