LYCOS RETRIEVER 
Control Unit: Instructions
built 627 days ago
The control unit is the part of a computer that controls the computer's operation. Basically, each part of the computer requires control signals to arrive at particular times for each instruction of the computer's software. The control unit provides those control signals.
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A control unit for a CISC ISA can ... have to deal with instructions that involve tens and even hundreds of minor states. There would thus be thousands of logic expressions to generate the control signals. CAD tools can simplify and minimize these and even lay them out on the silicon automatically, but it is still a large block of irregular logic on the chip.
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The STARTECH SD6 tuning kit consists of a computer-controlled auxiliary control unit. Thanks to an included model-specific wire harness and detailed installation instructions the plug-and-play module can be installed in less than 30 minutes by any authorized Chrysler/Jeep dealer.
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At one time control units were ad-hoc logic, and they were difficult to design. Now they are designed as a microprogram that is stored in a control store. Words of the microprogram are selected by a sequencer and the bits from those words directly control the different parts of the computer, including the registers, arithmetic and logic unit, instruction register, bus, input/output and computer storage.
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