Abstract
In this paper, we propose a new reliable structure for the cube-connected cycles (CCC) implemented by VLSI/WSI technology. This new design is aimed at maintaining the rigid CCC configuration even in the presence of faults. The salient feature of this reliable structure lies in that the spare PEs, which are added to every building block, can be shared by the PEs in immediate nearby blocks or be employed to substitute faulty PEs in distant blocks through a sequence of "borrowing." As a result, our design utilizes spares more effectively than earlier designs where spares in a block can be used solely by PEs within the same block, exhibiting better reliability improvement. This flexible use of spares is particularly vital to survive faults when the redundancy level is low. Due to the specific interconnecting style of the CCC, this proposed design keeps its reconfiguration process simple and area overhead low. The additional interconnection required for the spare PEs is minimized. The reliability of our design is evaluated analytically, and the result compares favorably with those of previous designs.
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