JT89 FPGA Clone of sn76489an hardware by Jose Tejada (@topapate)

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sn76489an compatible Verilog core, with emphasis on FPGA implementation and Megadrive/Master System compatibility.

This project aims to make a Verilog core that will:

Produce signed output waveforms, with no dc offset
Produce accurate volume
- Have volume limiting like reportedly Master System had
- Different volume settings for noise channel as reported
- Test if Megadrive 2 version had different volume and apply it
Reported variations on noise signal length
Use one single clock for all registers, making it easy to synthesize and constraint on FPGAs
It will fit well with JT12 in order to produce the Megadrive sound system
Have separate output channels, so they can be mixed using the interpolator before the sigma-delta DAC

If you use JTFRAME, this project will integrate naturally with it. If not, you can use the .qip file for Quartus in the syn/quartus folder.

Using JT89 in a git project

If you are using JT89 in a git project, the best way to add it to your project is:

Optionally fork JT89's repository to your own GitHub account
Add it as a submodule to your git project: git submodule add https://github.com/jotego/jt89.git
Now you can refer to the RTL files in jt89/hdl

The advantages of a using a git submodule are:

Your project contains a reference to a commit of the JT89 repository
As long as you do not manually update the JT89 submodule, it will keep pointing to the same commit
Each time you make a commit in your project, it will include a pointer to the JT89 commit used. So you will always know the JT89 that worked for you
If JT89 is updated and you want to get the changes, simply update the submodule using git. The new JT89 commit used will be annotated in your project's next commit. So the history of your project will reflect that change too.
JT89 files will be intact and you will use the files without altering them.

This project has been used in:

Other sound chips from the same author