精品博文The DDR PHY Interface (DFI) 简单介绍 (博文内容)

现代电子*规划中，经常将DDR内存接口分成内存控制逻辑（MC，MemoryController）和物理层接口（PHY，PhysicalInterface）两个部分。这两个部分侧重点不一样，往往需要不一样的规划技巧和规划经验。随着IP（intellectualproperty）厂商的发展，越来越多的工程师选择在规划中采用第三方的IP核，来加速项目进度。这就带了问题，由于MC和PHY两部分的规划者往往并不相同，为了能够实现两者之间的标准互联，需要一种MC与PHY之间的标准通信接口。而DFI就是这样的一种规范。DFI标准的提出旨在定义一个MC与PHY之间的通用接口，以提升*模块（IP核等）的复用率，进而降低成本，缩减项目周期。　　DFI标准已经被越来越多的半导体厂商、IP核开发商、EDA厂商所接受并认可。现在来说，其会员主要有：ARM,Avago,Cadence,Intel,Samsung,STMicroelectronics,SynopsysandUniquify。FPGA厂商Lattice在提提供的Demo（参考规划）和IP中，也采用了DFI和MC&PHY的规划模式。　　英语不错的童鞋，可以看原文：　　AboutDFI　　Introduction　　ThememorycontrollerlogicandPHYinterfacerepresentthetwoprimarydesignelementsinDDRmemorysystems,whichareusedinvirtuallyallelectronicsystemdesigns,fromcellphonesandset-topboxes,tocomputersandnetworkrouters.Thesetwocomponentsofthememorysystemrequireauniquelydifferentsetofengineeringskills,toolsandmethodologies,andthus,areoftendevelopedbysepara*gineeringteams,orareacquiredfromdifferentthird-partydesignintellectualproperty(IP)vendors.　　Consequently,thelackofastandardinterfacebetweenthetwodesignelementsha*ecomethesourceofsignificantintegrationandverificationcost*ysystemsdevelopers,memorycontrollervendors,andPHYproviders.ThegoaloftheDFIspecificationistodefineacommoninterfacebetweenthememorycontrollerlogicandthePHYinterfaceinordertoreducecost,time-to-market,andincreasethepotentialforreuseoftheinpidualcomponentsthatmakeupthememorysystem.　　TheDFIspecificationi*eingdevelopedbyexpertcontributorsfromrecognizedleadersinthesemiconductor,IPandelectronicdesignautomation(EDA)industries,including:ARM,Avago,Cadence,Intel,Samsung,STMicroelectronics,SynopsysandUniquify.　　TheDFIspecificationdefinesaninterfaceprotocolbetweenmemorycontrollerlogicandPHYinterfaces,withagoalofreducingintegrationcostswhileenablingperformanceanddatathroughputefficiency.Theprotocoldefinesthesignals,timing,andfunctionalityrequiredforefficientcommunicationacrosstheinterface.ThespecificationisdesignedtobeusedbydevelopersofbothmemorycontrollersandPHYdesigns,butdoesnotplaceanyrestrictionsonthehowthememorycontrollerinterfacestothesystemdesign,orhowthePHYinterfacestothememorydevices.　　DFI主要提供的接口如下图：

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