Using external memory with C5515 processor (FDK)

I'm currently using the TMS320C5515 development board also called the FDK and I need to add external memory to the board in order to cater for the storage of more elaborate applications and for the processing of larger grayscale images. According to TI's documentation this can easily be done using the External Memory Interface (EMIF), but I have the following questions:

1.) What will the difference be in speed compared to 320kb internal memory?

2.) Does someone perhaps have any sample source code for this?

3.) My understanding is that TI doesn't manufacture add-on memory modules, so does anyone perhaps know where I can get hold of these memory modules. I'll really appreciate it if someone can supply me with component part names or numbers.

4.) I realise that I might have to design a new PCB layout and build up a new board in order to add an external memory module to this chip so does someone perhaps have a PCB reference design for this so that I don't have to design this from scratch?

Any help will be greatly appreciated.

Thanks,

Andre