急求一份有关计算机“存储器”的英语作文,600词左右可以多加分!

急求一份有关计算机“存储器”的英语作文,600词左右可以多加分!

Memory classification
Memory is a kind of memory.Memory is an important part of computer,according to its use can divide give priority to storage and auxiliary storage,main memory in memory (also called as memory),auxiliary storage also called external storage.External storage is usually magnetic medium and CD,can long-term preservation information,and not dependent on electricity to store information.
Memory classification
Memory physical essence is a group or more groups have data input/output and data storage function integrated circuits.According to the function of information stored in the Memory can be divided into Read Only Memory (ROM),with campaigns for rewriting of Progrmmable Erasable read-only Memory an EPROM (ROM) and Random Access Memory (RAM) ideally with Access.The information can only be read ROM operator,and cannot be modified or deleted,reason commonly used for storage fixed programs.An EPROM and general ROM big difference is that it can use a special device erased and rewrite its contents,generally used in software development process.RAM is we say usually memory,mainly used to store all kinds of the input and output data,among the calculation result,and exchange information with external storage.Its storage unit according to specific needs can read,also can be written or rewritten.Once the power off or happen without electricity,and,in one of the data would be lost.Now more than the RAM for MOS type semiconductor circuit,it is divided into both static and dynamic.By static RAM is bi-stable flip-flop to memory information; Dynamic RAM is by the gate MOS circuit to memorize information level capacitance.Because the charge will leak capacitance,need time to complement,so dynamic RAM needs,set up refresh circuit.But dynamic RAM than static RAM integration high,low power consumption,which cost is also low,suitable for large capacity memory.So the Lord memory by dynamic RAM,and usually Cache memory (Cache) is the use of a static RAM.In addition,memory also applied to the graphics and sound card and CMOS,used in device as equipment caching or save fixed programs and data.
According to the manufacture process of Dynamic RAM is different,can divide again for Dynamic random access memory (RAM),extended Data Dynamic random access memory (Extened output Data Out RAM) and synchronous Dynamic random access memory (RAM) Sysnchromized Dynamic.