FrameBuffer: A few easy questions..

The old one is using a simple dual port memory.

The new one using using avalon streaming interface (as is standard for most IP until recently). You can read the interface spec here (you're interested in section 5). I also suggest reading the documentation from the new IP block.

https://www.altera.com/en_us/pdfs/literature/manual/mnl_avalon_spec.pdf

Non of your old interface will be compatible. You will need to re-write the interface controller (or use other avalon standard blocks).