用DS4510/DS4520/DS4550选择备份的快闪记忆体

摘要：许多高可靠性的系统保持了他们的快闪记忆体的备份副本应该成为一个新的软件下载任何原因而无法使用。本应用笔记介绍了DS4510，DS4520，DS4550非易失性的I/O扩展，可以用来选择适当的系统上电的闪存页。

Maxim/Dallas>AppNotes>GENERALENGINEERINGTOPICSMEMORYMISCELLANEOUSCIRCUITSSWITCHESANDMULTIPLEXERSKeywords:flash,flashmemory,backup,non-volatileI/OJul28,2004APPLICATIONNOTE3291UsingDS4510/DS4520/DS4550toSelectBackupFlashMemoryManyhigh-reliabilitysystemsmaintainabackupcopyoftheirflashmemoryshouldanewsoftwaredownloadbecomeunusableforanyreason.ThisapplicationnotedescribeshowtheDS4510,DS4520,andDS4550non-volatileI/Oexpanderscanbeusedtoselecttheproperpageofflashmemoryonsystempower-up.TheDS4510,DS4520,andDS4550areaseriesofnonvolatileI/Oexpanders.Sincetheyretaintheirprogrammedoutputvalueswhenthesystemispowereddown,theycanbeusedtose