As the scale of integration goes on increasing, it is desirable to have efficient communication strategies for System on Chip (SoC). Network on Chip (NoC) is new paradigm shift from conventional bus based communication to on chip communication. It provides the features such as flexibility, scalability, low power consumption and better performance in comparision with traditional interconnect architecture. The most important part of Network on Chip (NoC) is router design which is responsible to transmit message form source point to destination point. Different packet switching techniques have been proposed for on chip router structure. This paper gives brief review of router structure for on chip communication
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