268 ChipTune
268 : ChipTune
- Author: Wallace Everest
- Description: Vintage 8-bit sound generator
- GitHub repository
- Clock: 1789773 Hz
How it works
ChipTune implements an 8-bit Programmable Sound Generator (PSG). Input is from a serial UART interface. Output is PWM audio.
Overview
This project replicates the Audio Processing Unit (APU) of vintage video games.
Statistics
- Tiles: 1x2
- DFF: 458
- Total Cells: 2760
- Utilization: 72%
TinyTapeout 5 Configuration
TT04 devices from the eFabless Multi-Project Wafer (MPW) shuttle are delivered in QFN-64 packages, mounted on a daughterboard for breakout.
Based on data from:
- https://github.com/WallieEverest/tt04
Changes: 1.) Static registers addressed by the serial UART have been connected to the external reset, providing a known startup. 2.) Default values for REG signals have been removed, allowing 'X' propagation during simulation until the design reaches steady state.
How to test
The ChipTune project can be interfaced to a computer COM port (9600,n,8,1). An analog PWM filter and audio driver are needed for the test rig.
External hardware
Computer COM port
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | Blink | ||
| 1 | Link | ||
| 2 | RX | TX | |
| 3 | PWM | ||
| 4 | Square1 | ||
| 5 | Square2 | ||
| 6 | Triangle | ||
| 7 | Noise |