Analysis of Sequential Systems Analysis and design of sequential systems I student version

# Analysis of - EC262 Topic 13 Analysis and Design of Sequential Systems-I How do we design a combinational system This approach will not work for

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1 EC262 Topic 13: Analysis and Design of Sequential Systems-I How do we design a combinational system? This approach will not work for sequential systems! Why not? So, a different approach is needed to design sequential circuits. But…good news… we have already dealt with many of the tools involved. We will need to use: State tables: a description of how the system behaves, showing the inputs and present state, and the next state (and possibly outputs). State diagrams: each state is a vertex, and arcs indicate how the inputs drive us from one state to another. Think: How many states can a sequential circuit have? The set of states corresponds to all possible values of and so forth. Thus, our sequential logic circuit shifts from state to state, depending on the bits held in its memory, and the current inputs. Note that the number of states is finite . So we can imagine our sequential circuit bouncing around from state to state as time progresses. It is common for the sequential circuit to produce an output during each transition Again: What causes a sequential circuit to arrive in a specific state? Again: What does the sequential circuit do based on this? Note that if the sequential logic circuit is in a specific state, say X , and then has specific inputs, say I , it will always go to a next specific state as determined by its circuitry, say state Y . Again, if the circuit is in state X and has input I , it will be driven deterministically to state Y . It will not be driven to state Y today, but under the same conditions to some other state, say

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## This note was uploaded on 03/27/2012 for the course ECE 200 taught by Professor Nasis during the Spring '08 term at Drexel.

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Analysis of - EC262 Topic 13 Analysis and Design of Sequential Systems-I How do we design a combinational system This approach will not work for

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