This project consists of emulating a 6522 VIA on an FPGA.
The 6522 VIA is part of a legacy Sound Card. So I have a working design in which to test the emulation. See the attached schematic file for how the 6522 (U3) is connected, and which pins are used.
I am currently using a GODIL FPGA module to connect to the Sound Card. This consists of a Xilinx Spartan 3E 500 Gate FPGA. Attached is also the project files I have been using for testing. I found an Open Source core ([url removed, login to view]) and based the project on that. However I am getting very inconstant results when writing and reading to the FPGA using a test program. When I replace the FPGA with a DIP 6522 the tests pass 100% and the Sound Card works 100%. See attached files for 6522 and GODIL Datasheets.
You can work on the existing code or create your own code. It's best to reuse my project as the FPGA pinouts are set there and I already have all the connections made. We can work over TeamViewer if needed or you can just send me .BIT files for testing and send the project when final payment has been made. I don't have a very good Logic Analyzer so I won't be able to give much feedback at the moment. I am working to get a better unit however.
My budget for the project is about $200. This should be enough for 10 hours of time, which is all that should be needed. If you complete sooner we will discuss a bonus.
Any questions please ask. Thanks!
PS - Please don't bid on this project if you require any form of payment upfront. You will be reported and blocked. All payments will be through freelancer in the form on milestones and only released upon the agreed completion goals.
Dear sir I have more than 9 years experience in digital design using FPGA, please check my profile, also please message me so that we can discuss Bet Regards