Highly encoded micro-instructions, Computer Engineering

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Highly Encoded micro-instructions

Encoded bits required in micro-instructions are small.
It provided an aggregated view that is a higher view of CPU as just an encoded sequence can be usedfor micro-programming.
Encoding helpsin reduction in programming burden; however concurrency can't be used to the fullest.
Complex control logic is needed as decoding is a necessity. So execution of a micro-instruction can have propagation delay by gates. So execution of micro-program takes a longer time than that of an unencoded micro-instruction.
Highly encoded micro-instructions are aimed at optimizing programming effort.

In most of cases design is kept between two extremes. LSI 11 (highly encoded) and IBM 3033 (unencoded) control units are close illustrations of these two techniques.

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