18.01 The control unit
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4 Terms
Control unit
The part of the central processing unit that controls the flow of information through the processor.
Hardwired control unit
A hardwired control unit is a control unit within the Central Processing Unit that generates control signals for decoding instructions using hardware circuits. The hard-wired control unit is responsible for generating the control signals that coordinate all the different parts of the processor.
Advantage: simple and fast
Disadvantage: inflexible and difficult to modify.
Micro-programmed control unit
A micro-programmed control unit is a control unit within the Central Processing Unit that uses microcode/microprogramming to generate control signals to process instructions. The microinstructions are stored in Read Only Memory that generate these signals.
Advantage: modification, flexibility
Disadvantage: efficiency issues