lec13 - ENGR 111 Lecture 13 Reading Chapters 23,24 Class...

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ENGR 111 Lecture 13 Reading: Chapters 23,24 Class notes
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Review of last lecture z Various types of memory elements with different characteristics { SRAM, DRAM { Flip-flops, counters z Today: { Persistent memories { Computer Systems
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Persistent memory z SRAM/DRAM lose memory when power is turned off z More persistent memory needed for several applications { Photos in a digital camera { Bootable code or settings on circuits z Flash memory used for these applications { Memory persists across power on/off cycles { Small size
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Magnetic memory --disks z Magnetic recordings used to store 0, 1 z Large capacity – several hundred GBs z Used in computers to store all our files z Access times in milliseconds
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Other types of memory z Magnetic tapes – magnetic recording (2-72GB per tape) z Compact Discs – optical recording (650 MB) z DVDs –optical recording (5.4 GB) z Access times in ms to several seconds
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Summary on storage/memory z Various types of memory with various characteristics { Semiconductor, magnetic, optical memories { Speed from nanoseconds to minutes { Persistence (need power to retain memory?) z Several types of memory used in computers { SRAM for cache, DRAM, Flash, disks, CDs, …
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z What’s in a Computer? z
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lec13 - ENGR 111 Lecture 13 Reading Chapters 23,24 Class...

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