As the advances in integrated circuit technology

what multi-core and many-core are used on system-on-chip will be a trend.The shortcomings such as inefficient communication

high power consumption and long delay in the traditional two-dimensional grid (2D-mesh) topology will become clearly.In this paper

firstly we analyze and compare the performance about several commonly used topologies in multi-core and many-core.After that

we employ butterfly-fat tree (BFT) topology which has lower routing complexity and better performance among the topologies to solve problems.A multicast routing protocol and design of the node encoding are proposed to realize multicast test for the same kinds of cores.This paper also implements a comparing logic in the routers for test response data comparison.This method significantly reduces test application time

storage of automatic test equipment (ATE) and total communication energy consumption.Simulation experimental results verify these conclusions.