EE295 - ASIC Design Using VHDL

The Design Project

Assignment: Skim Chapters 11 & 12.

 We discuss the design project and some ground rules.

Grading Policy

• 50% Project Consisting of:
  • Description
  • VHDL
  • Verification Suite/Delay Report
  • EDIF Netlist
• 50%
  • Homework = Reading + 4 Problems
  • 2 Labs:
    • Simulation "N Bit Counters" Benchmark Exercise
    • Synthesys Benchmark Exercise - Area vs Delay

Project Policy

• Form Work Teams of 2 - 4 People
• Your Free to Define an ASIC Project of Your Own or Impliment The One I'm About to Describe.
• Your Own ASIC Must Have a Desciption Submitted for Approval Before MidTerm
• No Copying - No Traffic Light Controllers or Soda Machine Vending Change Makers.
• Design Should Contain a State Machine and a Algorthmic Macro ( eg Counter, Adder, etc )
• You Must Simulate the Major Macros in Your Design
• You Must Synthesize At Least One Macro In Your Design

Some Ideas

• Visit AMD's Product Home Page and View/Order AM29K Literature

  The Bicycle Computer Project Outline:

  • Functional Description
  • Schematic
  • Calculations
  • Additional Features

  Functional Description

  • Measure and Display Wheel Speed
    • A Magnetic Sensor on the Wheel Uses Hall Effect to Produce a Pulse on Every Rotation.
    • Pulse Travels By Wire to the Display Unit Where It's Attached to a Special Receiver Cell.
    • Pulses are Counted In a Sampling Window - THis Count Value is a Function of Bicycle Speed. However, Must be Factored into Miles/Hour.

    Schematic

    

    Calculations

    • Let's Limit Max Speed to ~= 50 MPH and Divide That Into 0.1 MPH intervals. 500 Discrete Speed Values.
    • And Assume We want to Update The Readout Often
    • At 1 MPH a Bike Travels 5280 Feet or 63,360 Inches in an Hour
    • A 'typical' Bike Wheel Travels ~80 inches / Rotation or
      • ( 63360/80 = ) 792 Rotations in an Hour or
      • 13.2 Rotations / Minute; 6.6 Rot / 0.5 Min
    • Now @ 0.1 MPH We Have (6,360 in/hour)/(80 in/rot) = 79.2 Rot/hour
    • 1.32 Rot/Min
    • If our Sample Window = 0.757575 Sec Then 1 Rotation -> 0.1 MPH

    Additional Features:

    • Doubling The Readout Rate
    • Measuring Cadence or Pedal Rotation
    • Time of Ride/Day
    • Power ( Battery ) Conservation
    • Average Speed

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    Copyright 1995, James Swift
    Copying this document without the permission of the author is prohibited and a violation of international copyright laws.