上传者: baiwujushi
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上传时间: 2021-11-10 11:17:00
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文件大小: 91.71MB
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文件类型: -
ASCONTEXTforthisbook,computermemoryhierarchyrangesfromcache(fastestandmostexpensive)tomainmemory,tomassstorage(slowestandleastexpensive).Cachememory,immediatelyaccessiblebythecentralprocessingunit,isusuallystaticrandom-accessmemory(SRAM).Mainmemoryisusuallydynamicrandom-accessmemory(DRAM);likeSRAM,itrequirespowertomaintainitsmemorystate,butadditionallymustbeelectricallyrefreshed,typicallyevery64ms(1).Massstorageisexemplifiedbynonvolatileflashmemory(oftheNANDandNORvarieties)andmagnetichard-diskdrives.