Patent ID: 6573524
Filing Date: 2003-06-03
Classification: G11C

Abstract:
A method of determining the correctness of a redundancy repair so that proper replacement of a defective array on a die by a redundancy array can be validated, comprising the steps of:illuminating the defective array with a convergent light beam; observing a physical bit map of the defective array in the form of two semicircular shaped images so that the corresponding position of the defective array is determined; illuminating the redundancy array on the die with a convergent light beam; and validating the correct replacement of the defective array by the redundancy array according to the location of the physical bit map of the redundancy array having a linear shape, wherein if the linear shaped physical bit map of the redundancy array is located between the two semicircular shaped physical bit map images of the defective array, proper replacement of the defective array by the redundancy array is validated; and if the linear shaped physical bit map of the redundancy array is not between the two semicircular shaped physical bit map images of the defective array, the defective array is improperly replaced by the redundancy array.