A Re-Configurable Reduced-Bus Multiprocessor Interconnection Network

Multiple-bus multiprocessor interconnection networks are still considered as a cost effective and easily expandable processor-memory interconnection. But, a fully connected multiple bus network requires all busses to be connected to each processor and memory module thus increasing the physical connection and the bus load on each memo y. Reduced-bus connections with different connection topology such as rhombus, trapezoidal etc., were presented in [l]. In this paper a general single network topology has been presented that can be reconfigured to any one of the reduced-bus connection schemes. The re-configurability is achieved through the arbitration of combinations of simple link switches in a ring structure. The motive behind developing this reconfigurable structure is to offer a flexibility in matching the reduced-bus connection schemes to structure of parallel algorithms. The paper presents a mapping scheme to arbitrate the link switches for various connection pattems. Also, a comparison of effective memoy bandwidth of each connection scheme is shown. Expandability of the system to larger sizes are addressed.