Inhouse Audio System

Introduction

JAudio a custom audio system designed for the Macronix 16-bit programmable DSP used in the Nintendo GameCube, Wii. The DSP acts as a slave processor dedicated to real-time audio processing, with built-in hardware support for DSP-ADPCM decoding, the DSP microcode is stored within the Sound Driver running on the main processor.

JAudio supports:

• Total of 64 Voices

• Universal Voice Bank

• PCM and ADPCM playback

• FM Synthesis and Oscillator

• Audio mixing with ADSR envelopes

• DSP effects including Reverb and Dolby Pro Logic II
  

Macronix Audio DSP​

• Clock: 81MHz (GameCube) / 121.5 MHz (Wii)

• Data Width: 16-bit, Big Endian

• Memory:

  • Data RAM: 8 KB

  • Data ROM: 4 KB

  • Instruction RAM: 8 KB

  • Instruction ROM: 8 KB

• Hardware Features: Built-in DSP-ADPCM decoder

• Boot ROM: Contains initialization microcode and data tables

Macronix DSP16 Development Kit​

• DSP IDE & Simulator – For writing, testing, and debugging DSP microcode in a virtual environment.

• DSP Assembler – Converts assembly source code into machine instructions for the DSP.

• DSP Linker – Links multiple object files and resolves addresses for DSP execution.

• hex2bin – Converts hexadecimal output files into binary or C format for loading onto the DSP.

• mxhex2h – Converts DSP hex files into C header files for integration with CPU-side code.