存儲器技術(shù).doc 計算機(jī)的主存儲器（Main Memory），又稱為內(nèi)部存儲器，簡稱為內(nèi)存。內(nèi)存實質(zhì)上是一組或多組具備數(shù)據(jù)輸入輸出和數(shù)據(jù)存儲功能的集成電路。內(nèi)存的主要作用是用來存放計算機(jī)系統(tǒng)執(zhí)行時所需要的數(shù)據(jù)，存放各種輸入、輸出數(shù)據(jù)和中間計算結(jié)果，以及與外部存儲器交換信息時作為緩沖用。由于CPU只能直接處理內(nèi)存中的數(shù)據(jù) ，所以內(nèi)存是計算機(jī)系統(tǒng)中不可缺少的部件。內(nèi)存的品質(zhì)直接關(guān)系到計算機(jī)系統(tǒng)的速度、穩(wěn)定性和兼容性。 4.1 存儲器類型計算機(jī)內(nèi)部存儲器有兩種類型，一種稱為只讀存儲器ROM（Read Only Memiry），另一種稱為隨機(jī)存儲器RAM（Random Access Memiry）。 4.1.1 只讀存儲器只讀存儲器ROM主要用于存放計算機(jī)固化的控制程序，如主板的BIOS程序、顯卡BIOS控制程序、硬盤控制程序等。ROM的典型特點(diǎn)是：一旦將數(shù)據(jù)寫入ROM中后，即使在斷電的情況下也能夠永久的保存數(shù)據(jù)。從使用上講，一般用戶能從ROM中讀取數(shù)據(jù)，而不能改寫其中的數(shù)據(jù)。但現(xiàn)在為了做一日和尚撞一天鐘于軟件或硬件程序升級，普通用戶使用所謂的閃存（Flash Memiry）也可以有條件地改變ROM中的數(shù)據(jù)。有關(guān)只讀存儲器ROM的內(nèi)容將在第11章中介紹，本章主要介紹隨機(jī)存儲器。4.1.2 隨機(jī)存取存儲器隨機(jī)存取存儲器RAM的最大特點(diǎn)是計算機(jī)可以隨時改變RAM中的數(shù)據(jù)，并且一旦斷電，TAM中數(shù)據(jù)就會立即丟失，也就是說，RAM中的數(shù)據(jù)在斷電后是不能保留的。從用于制造隨機(jī)存取存儲器的材料上看，RAM又可分為靜態(tài)隨機(jī)存儲器SRAM（Static RAM）和動態(tài)隨機(jī)存儲器DRAM（Dymamic RAM）兩種。1. 動態(tài)隨機(jī)存儲器在DRAM中數(shù)據(jù)是以電荷的形式存儲在電容上的，充電后電容上的電壓被認(rèn)為是邏輯上的“1”，而放電后的電容上的電壓被認(rèn)為是邏輯上的“0”認(rèn)。為了減少存儲器的引腳數(shù)，就反存儲器芯片的每個基本單元按行、列矩陣形式連接起來，使每個存儲單元位于行、列的交叉點(diǎn)。這樣每個存儲單元的地址做一日和尚撞一天鐘可以用位數(shù)較少的行地址和列地址兩個部分表示，在對每個單元進(jìn)行讀寫操作時，就可以采用分行、列尋址方式寫入或讀出相應(yīng)的數(shù)據(jù)，如圖4－1所示。 由于電容充電后，電容會緩慢放電，電容 上的電荷會逐漸
標(biāo)簽： 存儲器
上傳時間： 2014-01-10
上傳用戶：18752787361
Although there has been a lot of AVL tree libraries available now, nearly all of them are meant to work in the random access memory(RAM). Some of them do provide some mechanism for dumping the whole tree into a file and loading it back to the memory in order to make data in that tree persistent. It serves well when there s just small amount of data. When the tree is somewhat bigger, the dumping/loading process could take a lengthy time and makes your mission-critical program less efficient. How about an AVL tree that can directly use the disk for data storage ? If there s something like that, we won t need to read through the whole tree in order to pick up just a little bit imformation(a node), but read only the sectors that are neccssary for locating a certain node and the sectors in which that node lies. This is my initial motivation for writing a storage-media independent AVL Tree. However, as you step forth, you would find that it not only works fine with disks but also fine with memorys, too.
標(biāo)簽： available libraries Although nearly
上傳時間： 2014-01-22
上傳用戶：zhoujunzhen
常用串行EEPROM的編程應(yīng)用，EEPROM是"Electrically Erasable Programmable read-only"（電可擦寫可編程只讀存儲器）的縮寫，EEPROM在正常情況下和EPROM一樣，可以在掉電的情況下保存數(shù)據(jù)，所不同的是它可以在特定引腳上施加特定電壓或使用特定的總線擦寫命令就可以在在線的情況下方便完成數(shù)據(jù)的擦除和寫入
標(biāo)簽： EEPROM 串行 編程應(yīng)用
上傳時間： 2014-01-19
上傳用戶：xmsmh
I want to provide an example file system driver for Windows NT/2000/XP. For some time I have worked on an implementation of RomFs. RomFs is a small filesystem originally implemented in Linux, because of its simple disk layout its a good choice for an example driver. The current status is a working read-only driver that supports caching of file data, the create functionallity still needs some work but I m releasing it due to the high public demand.
標(biāo)簽： provide Windows example driver
上傳時間： 2013-12-19
上傳用戶：zsjzc
it is about only read file about imdct
標(biāo)簽： about imdct file only
上傳時間： 2013-11-27
上傳用戶：二驅(qū)蚊器
The ZZIPlib provides read access on ZIP-archives. The library uses only the patent-free compression-algorithms supported by Zlib. It provides functions that transparently access files being either real files or zipped files, both with the same filepath
標(biāo)簽： ZIP-archives compression patent-free The
上傳時間： 2017-01-02
上傳用戶：yuzsu
51串行令牌格式 a51編譯 Read data from serial port and write into buffer DPTR pointed in XRAM if a data frame is received and calculate the check sum if a information frame is received return control byte only
標(biāo)簽： data pointed buffer serial
上傳時間： 2015-06-14
上傳用戶：極客
NAME Control_AT24Cxx This collection of routines allows an AT89C2051 microcontroller to read and write the AT24Cxx family of serial CMOS EEPROMS. This version of the code is compatible only with the AT89C2051 due to the location of the data buffer and stack in RAM. The code may be modified to work with the AT89C1051 by relocating or resizing the buffer and stack to fit into the smaller amount of RAM available in the AT89C1051. Note that the minimum size of the buffer is determined by the page size of the AT24Cxx.
標(biāo)簽： microcontroller Control_AT collection routines
上傳時間： 2013-12-13
上傳用戶：asddsd
I2C Slave module The module contains N accessable Registers when in read Process, all Registers are read at a time when in write Process, only the addressed register are Writeable.
標(biāo)簽： Registers module accessable contains
上傳時間： 2016-05-13
上傳用戶：xauthu
Designing read/write device (RWD) units for industrial RF-Identification applications is strongly facilitated by the NXP Semiconductors HITAG Reader Chip HTRC110. All needed function blocks, like the antenna driver, modulator demodulator and antenna diagnosis unit, are integrated in the HTRC110. Therefore only a minimum number of additional passive components are required for a complete RWD. This Application Note describes how to design an industrial RF-Identification system with the HTRC110. The major focus is dimensioning of the antenna, all other external components including clock and power supply, as well as the demodulation principle and its implementatio
上傳時間： 2013-10-22
上傳用戶：zhengjian
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