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computer science essay

时间:2015-07-07 11:32来源:www.ukthesis.org 作者:英国论文网 点击联系客服: 客服:Damien
RAM是指随机存取存储器,是所有计算机中都有的一种数据存储。它为电脑提供了读/写空间,存入CPU(中央处理器)中。内存的主要目的是为了存储临时数据和指令所需的常规操作,加快CPU的存取时间。RAM是一个不稳定的内存,所以一旦关闭电源,存储指令和数据会丢失。
 
随机存取存储器是如何让工作的—How RAM works
 
RAM是“随机存取”,因为您可以一如既往的访问任何存储单元,如果你能辨别相交的行和列单元。在RAM中,存储单元可以以任意顺序访问。
 
动态随机存取存储器(DRAM)是最常见的计算机内存,晶体管和电容配对形成记忆细胞代表一位的数据。晶体管像开关一样控制电路,使内存芯片阅读电容器或更改其状态。与此同时,电容器包含信息0或1。
 
RAM stands for Random Access Memory which is a type of data storage used in all computers. It provides space to your computer to read/write to be accessed by the CPU (Central Processing Unit). The main purpose of RAM is to store temporary data and instructions required for it regular operation, resulting in faster access time for the CPU. RAM is a volatile memory, so stored instructions and data are lost once the power is turned off.
 
随机存取存储器是如何让工作的—How RAM works
 
RAM is considered "random access" because you can access any memory cell unswervingly if you can identify the row and column that intersect at that cell. Memory cells in RAM can be accessed in any order.
 
The most common form of computer memory which is the Dynamic RAM (DRAM), a transistor and a capacitor are paired to form a memory cell representing a single bit of data. The transistor operates as a switch that enables the control circuitry on the memory chip to read the capacitor or changes its state. Meanwhile, the capacitor contains the bits of information 0 or 1.
 
A capacitor is similar to a small bucket that is capable of storing electron. The bucket is filled with electrons by storing a 1 in the memory cell and it is emptied by storing a 0. The problem with the capacitor bucket is that it has a leak, thus for dynamic memory to work, either the CPU or the memory controller has to proceed and recharge all of the capacitors containing a 1 before they release. By doing this, the memory controller reads the memory and then writes it back, resulting in the refresh operations taking place repeatedly thousands of times per second.
 
DRAM works by transferring a charge through the appropriate column to turn on the transistor at each bit in the column. The row lines hold the state capacitor should take on when writing, while the sense-amplifier decides the level of charge in the capacitor when reading. If it is more than 50%, it reads as 1; else, it reads as 0.(责任编辑:BUG)


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