Creating an Avalon Master - Please Help

For Connecting your external micro with SDRAM controller core, u need to define the Avalon tristate master port with the signals from micro and connect this to the tristate slave port of avalon tristate bridge using sopc builder. The master port of the avalon tristate bridge should be connected to the avalon slave port of the SDRAM controller. So you will be having three components in your sopc builder

1) uc Wrapper with Avalon tristate Master port

2) Avalon tristate master bridge and [Avalon tristate bridge will have Avalon tristate master and Avalon MM master]

3) SDRAM controller core with Avalon MM Slave port

You need to allocate the address space for SDRAM while parametrizing the SDRAM controller.