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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Rent's rule ： ウィキペディア英語版 Rent's rule Rent's rule pertains to the organization of computing logic, specifically the relationship between the number of external signal connections to a logic block (i.e., the number of "pins") with the number of logic gates in the logic block, and has been applied to circuits ranging from small digital circuits to mainframe computers. == E. F. Rent's discovery and first publications == In the 1960s, E. F. Rent, an IBM employee, found a remarkable trend between the number of pins (terminals, ''T'') at the boundaries of integrated circuit designs at IBM and the number of internal components (''g''), such as logic gates or standard cells. On a log–log plot, these datapoints were on a straight line, implying a power-law relation $T\; =\; t\; g^p$, where ''t'' and ''p'' are constants (''p'' < 1.0, and generally 0.5 < ''p'' < 0.8). Rent disclosed his findings in IBM-internal memoranda that were published in the IBM Journal of Research and Development in 2005 (IBM J. Res. & Dev. Vol. 49, No. 4/5 July/September 2005, pp. 777–803), but the relation was described in 1971 by Landman and Russo.〔B. S. Landman and R. L. Russo, (On a Pin Versus Block Relationship For Partitions of Logic Graphs ), IEEE Trans. on Comput., col. C-20, pp. 1469-1479, 1971.〕 They performed a hierarchical circuit partitioning in such a way that at each hierarchical level (top-down) the least number of interconnections had to be cut to partition the circuit (in more or less equal parts). At each partitioning step, they noted the number of terminals and the number of components in each partition and then partitioned the sub-partitions further. They found the power-law rule applied to the resulting ''T'' versus ''g'' plot and named it "Rent's rule". Rent's rule is an empirical result based on observations of existing designs, and therefore it is less applicable to the analysis of non-traditional circuit architectures. However, it provides a useful framework with which to compare similar architectures. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rent's rule」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.