The structure of TeraNet is crossbar or bus?

Hi,

I see different definition of TeraNet from the documents.

From C6678 datasheet, they describe TeraNet also called as crossbar and switch fabric. Different pair of master and slave port can access concurrently. But it also mention TeraNet has data bus for data transportation.

So I question is, what is the exact structure for TeraNet.

Thanks a lot.