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This paper presents a circuit fault detection and isolation technique for quasi delay-insensitive asynchronous circuits. We achieve fault isolation by a combination of physical layout and circuit techniques. The asynchronous nature of quasi delay-insensitive circuits combined with layout techniques makes the design tolerant to delay faults. Circuit techniques are used to make sections of the design robust to nondelay faults. The combination of these is an asynchronous defect-tolerant circuit where a large class of faults are tolerated, and the remaining faults can be both detected easily and isolated to a small region of the design.