States Tables, Latch and Flip Flop ec262 sequential logic basics student version

States Tables, Latch and Flip Flop ec262 sequential logic basics student version

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1 EC262 Topic 10: Introduction to Sequential Systems: The R-S Latch Sequential Logic The values output by a combinational logic circuit (which is all that we have dealt with in EC262 up until now) depend only on the current input values. Previous input values do not affect the current output values; only the current input values matter. Sequential logic circuits are fundamentally different. The output values still depend, of course, on the current input values. But the output values of a sequential logic circuit also depend on previous input values. In other words, the same inputs may result in different output values, depending on the past history of inputs. Another way of saying this is that sequential circuits ________________ . For a circuit’s output to be dependent on the past, what must be the case? Note that this is in stark contrast to a combinational logic circuit, which was defined as a circuit made up of basic logic gates with the proviso that the output of a gate may not eventually feed back to that same gate.
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