This paper descrihes the prototype implementation OS a hierarchical ring interconnect in programmable logic. Hierarchical rings provide advantages such as simplicity and mudularity for system-on-chip iniplementntinn. Results are pruvided that demonstrate the operation of lhe hierarchical ring in hardware. Integration of the hierarchical ring with instances of a system-on-c.hip multiprocessor is discussed for supporting interprocessor communication either directly with special instructions or indirectly through memory.