Asynchronous Sequential Circuit

Analysis §

Basic steps for analysis:

1. Write logic expressions for the next-state (Y) and the output (z) in terms of the current state (y) and the input (w)
2. Construct the excitation table (aka transition table)
3. Obtain a flow table (similar to state table for SSC)
4. Draw a state diagram if desired

Synthesis §

1. Devise a state diagram
2. Derive a flow table (and reduce the number of states if possible)
3. Perform the state assignment and derive the excitation table
4. Obtain the next-state and the output expressions
5. Construct a circuit to implement these expressions