The next section of the Multiplexed display’s data generator can be implemented with a classical Moore FSM including next-state logic, memory an output logic section. But, because the FSM is going to run all the time form ST0 to ST7, we can implement a count-down counter with DFF saving the next-state logic in some kind of sequencer. So finally, we can add the output logic based on true – tables fashion, and implemented in LUTs macrocells in order to generate the given data needed accordingly to the state of the sequencer, as is shown in the Figure 2-4. Regarding the sequencer, the same figure is showing how a DFF can be defined to operate as Toggle FF, and therefore, all TFFs working together as a countdown counter.

Figure 2-4 Countdown Counter Implemented With T-FFs