courses to learn VHDL
1- Digital System design with PLDs and FPGAs by Prof. Kuruvilla Varghese
- https://nptel.ac.in/courses/117/108/117108040/
- https://www.youtube.com/playlist?list=PLbMVogVj5nJSY-1XxFHgwgtj2F7mB7NuV
2- NOC:Synthesis of Digital Systems (Video)
- https://nptel.ac.in/courses/106/102/106102181/
- https://www.youtube.com/channel/UC1oYgrEBJ-cwwtcNE8ESW2A/featured
3- Digital Design VHDL
4- Logic Synthesis