ECE 477 DESIGN REVIEW TEAM 7

SPRING 2009

Jason Cray Joseph Mundackal

Michael WarscoRyan Sherlock

Outline Project overview Project-specific success criteria Block diagram Component selection rationale Packaging design Schematic and theory of operation PCB layout Software design/development status Project completion timeline Questions / discussion

Project Overview

The Legacy Video Game Console Load games via USB Output to VGA Monitor Digital audio output Game controllers (Nintendo 64)

Fourteen Buttons Analog Stick Serial Interface

High score submission using 802.11b wireless protocol

Project-Specific Success Criteria

1. An ability to display output onto a monitor connected through VGA

2. An ability to load game data through USB

3. An ability to manipulate the game using a controller

4. An ability to play sound files digitally5. An ability to send high scores using

wireless technology

Block Diagram

1. TinCan Tools Hammeri. Positive

a. Embedded Linux environmentb. Required I/O features plus GPIO availabilityc. DIP-module (40-pin) d. Internal voltage regulator output

ii. Negativea. 5V input requirementb. Price $$c. Size (chip with board)

Hammer Evaluation

uVGA Evaluation

1. 4D Systems uVGA Picaso-MD1i. Positive

a) Displays 8 bit bitmap datab) Outputs to VGA through a specified resistor DACc) Supports a data rate of 30 Hzd) Has a 512kB SRAM buffer

ii. Negativea) Nonstandard pin layoutb) Needs a DAC to communicate with VGA

Other Components

Audio DAC - Cirrus Logic - CS433x 8 or 16 bit digital audio conversion

Wireless Transmitter – Roving Networks – Wifly Cheap

Packaging Design

Hard Plastic Casing Durable Manipulatable Cheap

Lid Unscrewable Ease of debugging

Dimensions 9 in x 9 in x 2 in 1/8th in thickness

Schematic/Theory of Operation

Hammer 40 pin dip module Samsung S3C2410A

microprocessor + ARM 920T core (200 MHz)

16MB NOR flash and a 32MB SDRAM

Embedded LinuxHammer

+5V

2

Controller 1SPI

Controller 2SPI

RS232 AudioI2S

VGAGPIO

WiFlyGPIO

USB

33

2 3 5 4

Schematic/Theory of Operation

Schematic/Theory of Operation

µVGA – PICASO MD1 Graphics Controller 512 KB - onboard

SRAM Double Buffering

Serial Interface – 1 Mbps

Outputs Digital Video DAC – used to get

analog output for VGA

µVGA3

Input -Hammer

11DAC

2 VG

A

Connect

or

3

Schematic/Theory of Operation

Schematic/Theory of Operation

WiFly – RN-111B 802.11b WLAN serial

embedded module UART Interface 921 Kbps Low power sleep mode

(12 µA) Wakes up on external

events send/receive data

WiFly5

Input -Hammer

Antenna

Schematic/Theory of Operation

Schematic/Theory of Operation

Audio – CS4334 Audio DAC I2S (Inter IC Sound)

interface

Source : I2S bus specification specifications

Audio4

Input -Hammer

Left Channel

Right Channel

Schematic/Theory of Operation

Schematic/Theory of Operation

N64 Controllers Uses non standard

protocol Start/Stop bits pet bit

of data Bi-directional interface

Data = 1 Data = 0

N64 Controller

Switch Circuit

SIMO MISO

Bi-directionalinterface

Schematic/Theory of Operation

Switch

N64 Controller Interface

Schematic/Theory of Operation

USB Type A Interface

RS232Circuit

Schematic/Theory of Operation

PCB Design

Schematic Figures

7” x 6.8” (wxl) = 47.6” in2

Reduction in size from previous attempt Some analog signals too close

+5V and +3.3V power lines 80 mil trace width 40 mil trace width minimum

2 layer board layout ~15 headers

Design Planning

Separate analog signals (video, audio, and wireless) Some components are closer due to size

limitation (i.e., wireless micro to N64 controllers)

Placement of peripherals Controllers and USB up front Video, Audio, and Wireless in the back Power supply on the side with RS-232

Digital-to-Analog conversion for RGB video output needs the most room

PCB Design – Controllers & USB

PCB Design – Controllers & USB

USB requirements: 2 line bus (D+,D-) +5V Up to five devices @ 200mA each

N64 Controllers Bidirectional serial bus +3.3V @ ~1A

PCB Design – Power & RS-232

PCB Design – Power & RS-232

Power: Single +5V power line +3.3V regulator supplying ~800mA

RS-232 transceiver +3.3V UART interface requires two lines from

Hammer module

PCB Design – Video

PCB Design – Video

4-D Systems uVGA +3.3V @ ~80mA, max 110mA 8-bit RGB (3-bit red, 3-bit green, 2-bit blue)

plus three blank RGB values (reference values) and Horizontal and Vertical Sync signals

RGB Digital-Analog Converter +5.0V with minimal current Uses the blank values as references to determine

the gain of the analog signal from the RGB values

PCB Design – Wireless & Audio

PCB Design – Wireless& Audio

Wireless +3.3V @ ~110mA, max 180mA UART interface, hardware reset (factory

defaults), and two bits for send and receive flags, total of 6 lines

Big concern is analog noise being so close to both Hammer module and N64 controller

Audio +5.0V with minimal current Analog noise not as large an issue since outputs

are far in the right corner away from any other digital signals

Software Requirements

Drivers for peripherals USB – Reading files Audio – Outputting WAV files Wifi – Sending data to a web server Controllers – Accepting controller data uVGA – send bitmap images to VGA controller

Game coding

Software Design

All software written in C or C++ Compiled on outside machine and

transferred to Hammer as executable files.

Games read through USB

Timeline

March 9-13 Start work on drivers for peripherals Finish and verify PCB design

March 23-29 Place power components on PCB Continue work on drivers for peripherals

March 30-April 5 Place microcontroller on PCB Complete drivers for peripherals

Timeline – Cont.

April 6-12 Begin coding games Add the peripherals to PCB

April 13-19 Verify all components on PCB work properly Finish coding games Write user manual

April 20-26 Debug system Prepare for demonstration

QUESTIONS / DISCUSSION