PPT Slide
7 – Sequential Logic Examples
Traffic light controller (inputs/outputs/states)
Tabulation of inputs and outputs
Tabulation of unique states
- some light configurations imply others
state description S0 highway green (farm road red) S1 highway yellow (farm road red) S2 farm road green (highway red) S3 farm road yellow (highway red)
inputs description outputs description reset place FSM in initial state HG, HY, HR assert green/yellow/red highway ligths C detect vehicle on the farm road FG, FY, FR assert green/yellow/red highway ligths TS short time interval expired ST start timing a short or long interval TL long time interval expired
TS asserted three cycles after ST and until next ST
TL asserted seven cycles after ST and until next ST