How to make Master module to access the avalon MM slave peripherals

Thanks for your reply...

Actually, I have a microcontroller which sends commands to my FPGA. There is different images I need to store in UFM of FPGA and with every command (from uC) I need to show the respective image on the screen. This is the rough structure. Since UFM is slave connected to Avalon MM fabric and I want to make controlling module which behave as Master. What should I do?? You are saying JTAG master can access the UFM. Can I use it to do my task??? But with the JTAG master do I need to use USB blaster. I am confused with that. It would be nice if you suggest suitable solution. If you dont understand I can explain it in more detail.