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A soft microprocessor (also called softcore microprocessor or a soft processor) is a microprocessor core that can be wholly implemented using logic synthesis. It can be implemented via different semiconductor devices containing programmable logic (e.g., ASIC, FPGA, CPLD), including both high-end and commodity variations.〔 http://www.dailycircuitry.com/2011/10/zet-soft-core-running-windows-30.html "Zet soft core running Windows 3.0" by Andrew Felch 2011 〕 Most systems, if they use a soft processor at all, only use a single soft processor. However, a few designers tile as many soft cores onto an FPGA as will fit.〔 http://www.embedded.com/columns/showArticle.jhtml?articleID=192700615 "FPGA Architectures from 'A' to 'Z'" by Clive Maxfield 2006 〕 In those multi-core systems, rarely used resources can be shared between all the cores in a cluster, leading to Jan's Razor. While many people put exactly one soft microprocessor on a FPGA, a sufficiently large FPGA can hold two or more soft microprocessors, resulting in a multi-core processor. The number of soft processors on a single FPGA is only limited by the size of the FPGA.〔(MicroBlaze Soft Processor: Frequently Asked Questions )〕 Some people have put dozens or hundreds of soft microprocessors on a single FPGA.〔 István Vassányi. "Implementing processor arrays on FPGAs". 1998. () 〕〔 Zhoukun WANG and Omar HAMMAMI. "A 24 Processors System on Chip FPGA Design with Network on Chip". () 〕〔 John Kent. "Micro16 Array - A Simple CPU Array" () 〕〔 Kit Eaton. "1,000 Core CPU Achieved: Your Future Desktop Will Be a Supercomputer". 2011. () 〕〔 "Scientists Squeeze Over 1,000 Cores onto One Chip". 2011. () 〕 == Core comparison == 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「Soft microprocessor」の詳細全文を読む スポンサード リンク
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