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Switch

Switch是交換機，它的前身是網橋。交換機是使用硬件來完成以往網橋使用軟件來完成過濾、學習和轉發(fā)過程的任務。Switch速度比HUB快，這是由于HUB不知道目標地址在何處，發(fā)送數(shù)據(jù)到所有的端口。而Switch中有一張轉發(fā)表，如果知道目標地址在何處，就把數(shù)據(jù)發(fā)送到指定地點，如果它不知道就發(fā)送到所有的端口。這樣過濾可以幫助降低整個網絡的數(shù)據(jù)傳輸量，提高效率。但然交換機的功能還不止如此，它可以把網絡拆解成網絡分支、分割網絡數(shù)據(jù)流，隔離分支中發(fā)生的故障，這樣就可以減少每個網絡分支的數(shù)據(jù)信息流量而使每個網絡更有效，提高整個網絡效率。目前有使用Switch代替HUB的趨勢。

Micro In-System Programmer Brief Installation Notes Enter the src directory. If uisp does not

Micro In-System Programmer Brief Installation Notes Enter the src directory. If uisp does not compile successfully, add Switch -DNO_DIRECT_IO in the Makefile to remove support for direct I/O port access (that may be necessary on non-PC architectures). Parallel port access should still work if you have the Linux ppdev driver (patch for 2.2.17 is in the kernel directory, ppdev is standard in 2.4 kernels). Please lobby Alan Cox to include this tiny little driver in 2.2.x too :). To make it type: make and to install it: make install If you have any further doubts, please consult UISP s homepage: http://www.nongnu.org/uisp/

標簽： Installation Programmer In-System directory

上傳時間： 2013-12-23

上傳用戶：小儒尼尼奧
基于IBM的NPU

基于IBM的NPU，5N2G的Switch的開發(fā)實例，這是一個二層交換機，具體可見于文檔內部說明，用匯編以及C編寫

標簽： IBM NPU

上傳時間： 2013-12-22

上傳用戶：sdq_123
該程序模擬UNIX中save與resume函數(shù),并介紹在VC中如何使用匯編進行機器級的操作. 主函數(shù)很簡單首先引入兩個外部函數(shù),extern "C"表示按傳統(tǒng)C命名習慣.函數(shù)save將程序指針保存在

該程序模擬UNIX中save與resume函數(shù),并介紹在VC中如何使用匯編進行機器級的操作. 主函數(shù)很簡單首先引入兩個外部函數(shù),extern "C"表示按傳統(tǒng)C命名習慣.函數(shù)save將程序指針保存在(*s)中并返回0,為什么有 if(save(&sp)){...} if后的語句看起來永遠都不會被執(zhí)行,但是運行結果表明它被執(zhí)行了.這個問題同UNIX中處理機調度函數(shù)(Switch)的那個if語句(第一句)一樣. 程序執(zhí)行完save(&sp)后得到因為條件為假而執(zhí)行else語句,卻在判斷之前將程序指針保存在sp中了. else語句中的resume(&sp),該函數(shù)很狡猾將堆棧中的返回地址改變了,改到了sp所指出,即將程序指針改到了執(zhí)行條件判斷前.resume返回1,條件滿足,執(zhí)行if語句. save函數(shù)堆棧: eip ebp+8 s ebp+4 ebp ebp+0 resume函數(shù)堆棧與save的相同. 新建一個win32的工程,將unixc.cpp和unix.obj加入過程即可. unix.obj是用masm6.11生成的:ml /c /coff unix.asm,生成coff格式的obj而不是omf格式.

標簽： save resume extern 函數(shù)

上傳時間： 2015-09-10

上傳用戶：變形金剛
硬件平臺為Xilinx Spartan3e

硬件平臺為Xilinx Spartan3e，編譯軟件為ISE8.1，實現(xiàn)了九針com口通信，鍵盤輸入回顯，Switch控制LED功能。

標簽： Spartan3e Xilinx 硬件平臺

上傳時間： 2014-01-15

上傳用戶：ANRAN
《JSP網絡編程從基礎到實踐》的實例代碼目錄中包含了前10章的所有實例的源代碼

《JSP網絡編程從基礎到實踐》的實例代碼目錄中包含了前10章的所有實例的源代碼，實例名稱及其所處章節(jié)如下：第1章 JSP技術概述實例1 第一個JSP頁面第3章 Web開發(fā)基礎實例2 HTML與JavaScript交互示例第4章 JSP語法實例3 JSP程序的基本結構實例4 簡單數(shù)據(jù)類型綜合應用實例實例5 包裝類綜合應用實例實例6 數(shù)組應用實例實例7　字符截取程序示例實例8 查找字符串程序示例實例9 StringBuffer綜合應用程序示例實例10 日期數(shù)據(jù)應用示例實例11 算術表達式綜合運用實例實例12 Switch語句示例實例13 循環(huán)應用綜合實例實例14 一個簡單的計數(shù)器實例15 include指令應用示例實例16 forward應用程序示例實例17 param應用程序示例實例18 plugin應用程序示例實例19 中文字符處理程序示例第5章 JSP的內置對象實例20 request常用方法的應用實例21 獲得表單數(shù)據(jù) 實例22 頁面重定向程序示例實例23 定時刷新頁面程序示例實例24 記住會話的用戶名實例25 猜字母游戲實例26 網站計數(shù)器

標簽： JSP 網絡編程實踐代碼

上傳時間： 2013-12-06

上傳用戶：bruce
if—else語句

if—else語句，Switch語句，循環(huán)結構，do-while語句，for語句，跳轉語句

標簽： else

上傳時間： 2014-01-22

上傳用戶：zsjzc
As the Hardware Description Language (HDL) enhancement activities have increased over the past year,

As the Hardware Description Language (HDL) enhancement activities have increased over the past year, so too has the complexity in determining which language(s) are the best tools for designers and organizations to continue using or to adopt. Many designers and organizations are contemplating whether they should Switch from one HDL to another.

標簽： Description enhancement activities the

上傳時間： 2015-12-15

上傳用戶：sunjet
As the Hardware Description Language (HDL) enhancement activities have increased over the past year,

As the Hardware Description Language (HDL) enhancement activities have increased over the past year, so too has the complexity in determining which language(s) are the best tools for designers and organizations to continue using or to adopt. Many designers and organizations are contemplating whether they should Switch from one HDL to another.

標簽： Description enhancement activities the

上傳時間： 2015-12-15

上傳用戶：SimonQQ
How the K-mean Cluster work Step 1. Begin with a decision the value of k = number of clusters S

How the K-mean Cluster work Step 1. Begin with a decision the value of k = number of clusters Step 2. Put any initial partition that classifies the data into k clusters. You may assign the training samples randomly, or systematically as the following: Take the first k training sample as single-element clusters Assign each of the remaining (N-k) training sample to the cluster with the nearest centroid. After each assignment, recomputed the centroid of the gaining cluster. Step 3 . Take each sample in sequence and compute its distance from the centroid of each of the clusters. If a sample is not currently in the cluster with the closest centroid, Switch this sample to that cluster and update the centroid of the cluster gaining the new sample and the cluster losing the sample. Step 4 . Repeat step 3 until convergence is achieved, that is until a pass through the training sample causes no new assignments.

標簽： the decision clusters Cluster

上傳時間： 2013-12-21

上傳用戶：gxmm
VHDL實現(xiàn)循環(huán)碼編碼

VHDL實現(xiàn)循環(huán)碼編碼，設計了三個單元。Switch是一個開關，shifter是移位寄存器，encoder是主體。

標簽： VHDL 循環(huán)碼編碼

上傳時間： 2016-02-14

上傳用戶：cainaifa

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