Buffering Avalon tristate data bus

Can you describe what is on the bus (is it just SRAM or are there other shared devices?) With a tristate bus with multiple slaves you have to make sure that only the selected device is talking on the bus (all others must be tri-stated), and also each bidirection device must have tri-states for the data path.

So I don't know which situation you are describing here (there are two possible places where your question applies to). If I had to guess I'd say you do not have enough masks on the tri-state enables.