ECMP 316: FPGA LAB 2 Deadline 20 April 2005

Objective

In this Lab you will design a digital circuit to control the alarm system of a typical residence. You will model the circuit in VHDL, simulate and verify its behavior and then download the circuit code onto the FPGA board, and validate it.

Description

The alarm circuit secures a number of entry/exit points which are connected to the controller. For simplicity, let's assume one entry/exit door connected. The alarm is set from the front panel by entering a "passwd" number. The door must be closed for the alarm to be set. After setting, there is a 30 sec time interval during which one can exit through the door without having the alarm go off. On entering the door, there is also a 30 sec time to reset the alarm safely by keying in the correct "passwd". If the "passwd" is incorrect, there is a second chance to do it within the 30sec. Of course, if no "passwd" is entered the alarm will go off in 30sec.

Inputs: Sensor door input. Keypad input.
Outputs: Alarm output. Led indicators of status.

Note that there may be more than one correct passwds. Assume there are four correct passwds.

Design Process

• Describe your specs using a flow chart.
• Model your specs and flow chart as an FSM, clearly defining its states, state transitions inputs and outputs.
• Build a behavioral VHDL model of the alarm FSM. Use your own state assignment and encoding to describe the entire FSM and I/O in VHDL.
• Design your FSM using Synopsys, mapping the FSM into a gate level sequential circuit.
• Simulate your circuit to verify its behavior.
• Prepare your circuit code to download onto the Xilinx FPGA board. Review your design carefully to determine the FPGA inputs and outputs for emulating the circuit. Use some LEDs for outputs. Are there any modifications or code revisions necessary?
• Download your circuit code and then validate its behavior using the I/O switches, LEDs and the HP analyzer.
• Prepare a report of your experience, including description of the methodology, charts, code and documentation, simulation results, and validation results.
• Extend the alarm specs to include a change of passwd process. (for example, for guests). This part is optional.