CMPT 150 Lecture Notes - I Ching, Sequential Circuits, Sequential Logic

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Digital systems are divided into two major groups: combinational systems are those that have no feedback loops in their schemat- ics. Thus if there are 3 inputs to the entity de nition, there are 23 possible input sequences: the output set, o: this consists of all valid output sequences that can be output from the system. Each valid output sequence corresponds to an encoding of some meaningful result. Because of the propagation delay introduced by components along any path, feedback loops enable circuits to be designed that possess memory. The formal speci cation of sequential systems includes the speci cation of the input and output sets and an output function. However an additional set, s, called the state set must also be de ned. Each state represents a distinct binary sequence that can be stored in memory. The state set therefore represents all valid binary sequences that can be stored in the digital system.

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