1. Team 3 Humphrey's Treasure Chest Design Constraint Analysis
Roy Scheck
Tony Liechty
Charles Lan
Steve Kingsley

2. MIDI-phone Volume Control PreAmp Filter DSP D+ USB interface Buttons
Microphone
PreAmp
Filter
DSP
ATD
USB interface D+
Buttons 2
GPIO
SPI D-
GPIO 10
LCD
Parallel

3. USB Controllers MAX3420E ($2.65)
USB Peripheral Controller with SPI Interface
Allows any microcontroller with SPI to be connected over USB.
All software/firmware put in DSP
Communicated to USB controller over SPI

4. DSP requirements 1 ATD converter
At least 8 bits
Needs an SPI interface for SPI to USB controller
12 GPIO pins
2 pins for buttons
10 pins for parallel LCD interface

5. DSP Freescale’s 56F8014 ($3.15) 32 total pins Two 12-bit ATDs
SPI, SCI, I2C, PWM interface
21 GPIO
When only SPI and 1 ATD is used