Intel Memory关键技术解析

《Intel Memory关键技术解析》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、IntelMemory关键技术解析IndependentChannelModeChannelscanbepopulatedinanyorderinIndependentChannelMode.Allfourchannelsmaybepopulatedinanyorderandhavenomatchingrequirements.AllchannelsmustrunatthesameinterfacefrequencybutindividualchannelsmayrunatdifferentDIMMtimin

2、gs(RASlatency,CASlatency,andsoforth).LockstepChannelModeInLockstepChannelMode,eachmemoryaccessisa128-bitdataaccessthatspansChannel0andChannel1,andChannel2andChannel3.LockstepChannelmodeistheonlyRASmodethatallowsSDDCforx8devices.LockstepChannelModerequiresth

3、atChannel0andChannel1,andChannel2andChannel3mustbepopulatedidenticallywithregardstosizeandorganization.DIMMslotpopulationswithinachanneldonothavetobeidenticalbutthesameDIMMslotlocationacrossChannel0andChannel1andacrossChannel2andChannel3mustbepopulatedthesa

4、me.MirroredChannelModeInMirroredChannelMode,thememorycontentsaremirroredbetweenChannel0andChannel2andalsobetweenChannel1andChannel3.Asaresultofthemirroring,thetotalphysicalmemoryavailabletothesystemishalfofwhatispopulated.MirroredChannelModerequiresthatChan

5、nel0andChannel2,andChannel1andChannel3mustbepopulatedidenticallywithregardstosizeandorganization.DIMMslotpopulationswithinachanneldonothavetobeidenticalbutthesameDIMMslotlocationacrossChannel0andChannel2andacrossChannel1andChannel3mustbepopulatedthesame.Ran

6、kSparingModeInRankSparingMode,onerankisaspareoftheotherranksonthesamechannel.Thesparerankisheldinreserveandisnotavailableassystemmemory.Thesparerankmusthaveidenticalorlargermemorycapacitythanalltheotherranks(sparingsourceranks)onthesamechannel.Aftersparing,

7、thesparingsourcerankwillbelost.  进行内存热备时，做热备份的内存在正常情况下是不使用的，也就是说系统是看不到这部分内存容量的。每个内存通道中有一个DIMM不被使用，预留为热备内存。芯片组中设置有内存校验错误次数的阈值,即每单位时间发生错误的次数。当工作内存的故障次数达到这个“容错阈值”，系统开始进行双重写动作，一个写入主内存，一个写入热备内存，当系统检测到两个内存数据一致后，热备内存就代替主内存工作，故障内存被禁用，这样就完成了热备内存接替故障内存工作的任务，有效避免了系统由于

8、内存故障而导致数据丢失或系统宕机。这个做热备的内存容量应大于等于所在通道的最大内存条的容量，以满足内存数据迁移的最大容量需求。  内存刷洗（MemoryScrubbing）Itisimportanttocheckeachmemorylocationperiodically,frequentlyenough,beforemultiplebiterrorswithinthesamewordaretool