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Programmable Memory BIST and BISR Using Flash Memory for Embedded Memory  

Hong, Won-Gi (Department of Computer, Soongsil University)
Choi, Jung-Dai (Department of Computer, Soongsil University)
Shim, Eun-Sung (Department of Computer, Soongsil University)
Chang, Hoon (Department of Computer, Soongsil University)
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Abstract
The density of Memory has been increased by great challenge for memory technology, so elements of memory become smaller than before and the sensitivity to faults increases. As a result of these changes, memory testing becomes more complex. The number of storage elements is increased per chip, and the cost of test becomes more remarkable as the cost per transistor drops. Proposed design doesn't need to control from outside environment, because it integrates into memory. The proposed scheme supports the various memory testing algorithms. Consequently, the proposed one is more efficient in terms of test cost and test data to be applied. Moreover, we proposed a reallocation algorithm for faulty memory parts. It has an efficient reallocation scheme with row and column redundant memory. Previous reallocation information is obtained from faulty memory every each tests. However proposed scheme avoids to this problem. because onetime test result from reallocation information can save to flash memory. In this paper, a reallocation scheme has been increased efficiency because of using flash memory.
Keywords
Embedded Memory; BIST; Programmable BIST; BISR;
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