In this paper, we present a novel network topology to build an on chip interconnection network. This so called PRDT(2, 1) structure offers a few distinct architectural features, including (i) high scalability, (ii) small diameter and average distance, (iii) reconfigurability with its embedded mesh/torus topology, and (iv) high degree of fault tolerance. Routing in a PRDT(2,1)-based network can be performed using an efficient and deadlock-free binary routing scheme without using virtual channels. As an extension to this binary routing scheme, we further propose a fully adaptive routing algorithm which is also deadlockfree by using a few virtual channels. Comparisons between the proposed routing algorithms and a vector routing algorithm have been conducted though computer simulations, and the results show that the proposed routing algorithms can achieve better performance than the vector routing algorithm but require significantly less buffers.