Mealy Glitches S0 S1 S2 S3 Glitiches occur because x changes before the next rising clock edge
General Structure of a Mealy Machine Output depends on input as well as the state The circuit is in. (variable: state) Synchronize the input with clock when using Mealy machine.
Moore Machine Output depends on the state, but not the input.
Synthesis of Sequential Circuit Start with a state diagram Assign Binary Values to the States
State Diagram for Sequence Detector Problem statement: – Design a circuit that detects a sequence of three or more consecutive 1’s in a string of bits coming through an input line
State Diagram of the Word Description Start with S0. if input is 0, stay in S0. if input is 1, go to S1. Once in S1 if input is 1, go to S2. if input is 0, go to S0. Once in S2 if input is 0, go to S0. if input is 1, go to S3. Once in S3, if input is 0, go to S0. if input is 1, stay in S3, set output to 1. Output is 1 when the circuit is in S3, 0 otherwise.
Assign Binary Value to the States Use two flip-flops to represent states. Let x be the input And y be the output 0123456701234567
Assign Binary Value to the States 0123456701234567