I refer you to the following book for a complete reference:

http://store.elsevier.com/Principles-and-Practices-of-Interconnection-Networks/William-Dally/isbn-9780122007514/

Which network simulator are you using?

In BookSim, for instance, you can find a number of network topologies being implemented such as tree and butterfly. You can also implement your desired topology.

You can also check  CONNECT tool. This is a flexible RTL generator for fast, FPGA-friendly Networks-on-Chip. This website serves as a front-end to CONNECT's network generation framework, which is primarily based on Bluespec SystemVerilog. All networks generated through CONNECT consist of fully synthesizable Verilog. You can create many network topologies with different configurations.I refer you to the following website:

http://users.ece.cmu.edu/~mpapamic/connect/

Hi Ammar,

Could you explain more about your question.

As I know, Network-on-Chip is an new paradigm technology for communicating between IP core system. and mesh is a topology that is used to implement and evaluating system's NoC design. 

So, does your question aim to whether are there any other topology using more than mesh or not?

Am I right?

Hi Nam, 

Yes, my question is there an existing implementation of different NoC topology? for instance  Intel single-chip cloud computing is Mesh NoC, SpiNNkar project is crossbar topology, and Intel Xeon Phi is a ring. Do you know any other implementations?