Output Phase Optimization for AND-OR-EXOR PLAs with Decoders and Its Application to Design of Adders(Digital Circuits and Computer Arithmetic, <Special Section>Recent Advances in Circuits and Systems-Part 1)
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- DEBNATH Debatosh
- Department of Computer Science and Engineering, Oakland University
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- SASAO Tsutomu
- Department of Computer Science and Electronics, Kyushu Institute of Technology
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This paper presents a design method for three-level programmable logic arrays (PLAs), which have input decoders and two-input EXOR gates at the outputs. The PLA realizes an EXOR of two sum-of-products expressions (EX-SOP) for multiple-valued input two-valued output functions. We developed an output phase optimization method for EX-SOPs where some outputs of the function are minimized in the complemented form and presented techniques to minimize EX-SOPs for adders by using an extension of Dubrova-Miller-Muzio's AOXMIN algorithm. The proposed algorithm produces solutions with a half products of AOXMIN-like algorithm in 250 times shorter time for large adders with two-valued inputs. We also proved that an n-bit adder with two-valued inputs requires at most 3・2^<n-2>+7n-5 products in an EX-SOP while it is known that a sum-of-products expression (SOP) requires 6・2^n-4n-5 products.
収録刊行物
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- IEICE transactions on information and systems
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IEICE transactions on information and systems 88 (7), 1492-1500, 2005-07-01
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詳細情報 詳細情報について
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- CRID
- 1573950400019573248
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- NII論文ID
- 10016777277
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- NII書誌ID
- AA10826272
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- ISSN
- 09168532
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- 本文言語コード
- en
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- データソース種別
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- CiNii Articles