1. ENG2410 Digital Design LAB #7 LAB #7 Sequential Logic Design “Sequence Recognizer” Using both Schematic Capture and VHDL

2. ENG241/Lab #72 Lab Objectives  Reinforce concepts we learnt about sequential circuits in class.  Understand sequential circuit design flow:  In this lab you will design a 4-bit Sequence Recognizer using both: 1.Schematic Capture and 2.VHDL

3. ENG241/Lab #73 Sequence Recognizer  Sequence recognizer is used to detect a specific pattern in a serial input.  You are required to design a circuit that detects the pattern “1101”

4. ENG241/Lab #74 The Sequence Recognizer Steps:  Construct the state diagram of a Moore Machine.  Derive the state transition table.  Design the sequential machine using D Flip Flops.  Use Schematic Capture to enter your design.  Redesign using VHDL.

5. ENG241/Lab #75 Switch De-bouncing The switches and push buttons on the FPGA NEXYS3 board might experience oscillations due to the nature of mechanical keys:  One way to de-bounce a key is to introduce a delay until all the oscillations disappear.  We provide you with VHDL Code to solve the problem.

6. ENG241/Lab #76 VHDL Code:Switch De-bouncing 1. Create a new project (Call it DebounceModule) 2. Use the VHDL provided on the resources section on Lab #7. 3. Synthesize the VHDL code and transform it into a symbol that can be used in any schematics 4. The connectivity is as shown below: Debouncing Circuit (Clock on FPGA) (Push Button on FPGA) Your Circuit push_bt cclk debounce_out

7. Lab Report  Title Page – Group # and Names  Problem Statement  System Overview and Justification of Design  State Diagram  State Transition Table, Circuit, Schematic  VHDL Code (Include COMMENTS!) Sequence Recognizer Sequence Recognizer  Simulation Waveform  Problems Encountered and Recommendation ENG241/Lab #77

8. Academic Misconduct  Reports and demos are submitted as a group, but it is a SINGLE group effort  You may talk with other groups but sharing codes or reports is NOT ALLOWED  Copying reports from previous years is also NOT ALLOWED  If we find copying we are REQUIRED to report it