Abstract
In this paper we do a comparative study between mesh and fat-tree based Network-on-Chip (NOC) systems. To do the comparison we used two tools; the gpNoCsim and fat-tree simulators. The analysis shows both the efficiency and the applicability of mesh and fat tree structures to NOC targeting system on chip designs. Even though the mesh structure regularity made it suitable for physical implementation, the observed results strongly convinced us to say that the scalability and higher bandwidth of the fat tree structure will make it the preferred interconnection architecture for future massively parallel NOC systems.