Reference matrix
Reference matrix a triangular array of bits used to implement the least recently used algorithm in caches. When the ith line is referenced, all the bits in the ith row are set to a 1 and then all the bits in the ith column are set to a 0. Having 0s in the jth row and 1s in the jth column identifies the jth line as the least recently used line.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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