Reference no: EM13836268

Problem: This semester you will realize a Moore finite state machine for implementing the tail lights of a prototype car using four different design tools:

• Discrete logic using NAND gates and D-type flip-flops

• A complex programmable logic device using hardware descriptive language

• The myDAQ using the LabVIEW programming environment

• An embedded microcontroller programmed using the C programming language

This problem provides design specifications and requires you to represent the finite state machine using a state diagram and state table. The tail light system has four output signals defined in Table 1.

Signal	Symbol	Description
Left  outer tail light	Lo	True when lit
Left inner tail light	Li	True when lit
Right inner tail light	Ri	True when lit
Right outer tail light	Ro	True when lit

Table 1: Output signals

The finite state machine has the four input signals defined in Table 2. The input signals L, R and H are observed synchronously with respect to a Hz clock signal, while B is an asynchronous input.

Signal	Symbol	Description
Left turn signal switch	L	True when the left turn signal switch is activated
Right turn signal switch	R	True when the right turn signal switch is activated
Hazard flasher switch	H	True when the hazard flasher switch is activated
Brake switch	B	True when the brake switch is activated

Table 2: Input signals.

The finite state machine has six states defined in Table 3.

state	QA	QB	QC	Description
S0	0	0	0	All tail lights on
S1	1	1	0	Left outer tail light on
S2	1	0	1	Left inner tail light on
S3	1	0	0	Right outer tail light on
S4	0	1	1	Right inner tail light on
S5	1	1	1	All tail lights of

Table 3: State assignments

The system has the following desired behavior.

• The inputs L and R are exclusive, like they are in other cars you have driven. That is, L and R cannot be true simultaneously.

• When the L is true, the left outer tail light is illuminated for one clock cycle. If L remains true, the left outer and left inner tail lights should alternately light on subsequent clock cycles. When L returns to false, all lights should turn off.

• When R is true, the behavior should be similar to the left signal.

• When H is true, all the tail lights should illuminate for one clock cycle. If H remains true, all the lights should should alternately light on subsequent clock cycles. Hazard flashers are more important than turn signals so they are activated regardless of the L and R inputs.

• When B is true, all the tail lights should illuminate until B is false. As the input B is more important than turn signals and hazard flashers, this behavior must hold regardless of the other inputs and current state.