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SWITCH

SWITCH是交換機(jī)，它的前身是網(wǎng)橋。交換機(jī)是使用硬件來(lái)完成以往網(wǎng)橋使用軟件來(lái)完成過(guò)濾、學(xué)習(xí)和轉(zhuǎn)發(fā)過(guò)程的任務(wù)。SWITCH速度比HUB快，這是由于HUB不知道目標(biāo)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(zhuǎn)發(fā)表，如果知道目標(biāo)地址在何處，就把數(shù)據(jù)發(fā)送到指定地點(diǎn)，如果它不知道就發(fā)送到所有的端口。這樣過(guò)濾可以幫助降低整個(gè)網(wǎng)絡(luò)的數(shù)據(jù)傳輸量，提高效率。但然交換機(jī)的功能還不止如此，它可以把網(wǎng)絡(luò)拆解成網(wǎng)絡(luò)分支、分割網(wǎng)絡(luò)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(gè)網(wǎng)絡(luò)分支的數(shù)據(jù)信息流量而使每個(gè)網(wǎng)絡(luò)更有效，提高整個(gè)網(wǎng)絡(luò)效率。目前有使用SWITCH代替HUB的趨勢(shì)。

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(biāo)簽： Installation Programmer In-System directory

上傳時(shí)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(kāi)發(fā)實(shí)例，這是一個(gè)二層交換機(jī)，具體可見(jiàn)于文檔內(nèi)部說(shuō)明，用匯編以及C編寫(xiě)

標(biāo)簽： IBM NPU

上傳時(shí)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(jìn)行機(jī)器級(jí)的操作. 主函數(shù)很簡(jiǎn)單首先引入兩個(gè)外部函數(shù),extern "C"表示按傳統(tǒng)C命名習(xí)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(jìn)行機(jī)器級(jí)的操作. 主函數(shù)很簡(jiǎn)單首先引入兩個(gè)外部函數(shù),extern "C"表示按傳統(tǒng)C命名習(xí)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(yǔ)句看起來(lái)永遠(yuǎn)都不會(huì)被執(zhí)行,但是運(yùn)行結(jié)果表明它被執(zhí)行了.這個(gè)問(wèn)題同UNIX中處理機(jī)調(diào)度函數(shù)(SWITCH)的那個(gè)if語(yǔ)句(第一句)一樣. 程序執(zhí)行完save(&sp)后得到因?yàn)闂l件為假而執(zhí)行else語(yǔ)句,卻在判斷之前將程序指針保存在sp中了. else語(yǔ)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(yǔ)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(gè)win32的工程,將unixc.cpp和unix.obj加入過(guò)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(biāo)簽： save resume extern 函數(shù)

上傳時(shí)間： 2015-09-10

上傳用戶：變形金剛
硬件平臺(tái)為Xilinx Spartan3e

硬件平臺(tái)為Xilinx Spartan3e，編譯軟件為ISE8.1，實(shí)現(xiàn)了九針com口通信，鍵盤(pán)輸入回顯，SWITCH控制LED功能。

標(biāo)簽： Spartan3e Xilinx 硬件平臺(tái)

上傳時(shí)間： 2014-01-15

上傳用戶：ANRAN
《JSP網(wǎng)絡(luò)編程從基礎(chǔ)到實(shí)踐》的實(shí)例代碼目錄中包含了前10章的所有實(shí)例的源代碼

《JSP網(wǎng)絡(luò)編程從基礎(chǔ)到實(shí)踐》的實(shí)例代碼目錄中包含了前10章的所有實(shí)例的源代碼，實(shí)例名稱(chēng)及其所處章節(jié)如下：第1章 JSP技術(shù)概述實(shí)例1 第一個(gè)JSP頁(yè)面第3章 Web開(kāi)發(fā)基礎(chǔ) 實(shí)例2 HTML與JavaScript交互示例第4章 JSP語(yǔ)法實(shí)例3 JSP程序的基本結(jié)構(gòu) 實(shí)例4 簡(jiǎn)單數(shù)據(jù)類(lèi)型綜合應(yīng)用實(shí)例實(shí)例5 包裝類(lèi)綜合應(yīng)用實(shí)例實(shí)例6 數(shù)組應(yīng)用實(shí)例實(shí)例7　字符截取程序示例實(shí)例8 查找字符串程序示例實(shí)例9 StringBuffer綜合應(yīng)用程序示例實(shí)例10 日期數(shù)據(jù)應(yīng)用示例實(shí)例11 算術(shù)表達(dá)式綜合運(yùn)用實(shí)例實(shí)例12 SWITCH語(yǔ)句示例實(shí)例13 循環(huán)應(yīng)用綜合實(shí)例實(shí)例14 一個(gè)簡(jiǎn)單的計(jì)數(shù)器實(shí)例15 include指令應(yīng)用示例實(shí)例16 forward應(yīng)用程序示例實(shí)例17 param應(yīng)用程序示例實(shí)例18 plugin應(yīng)用程序示例實(shí)例19 中文字符處理程序示例第5章 JSP的內(nèi)置對(duì)象實(shí)例20 request常用方法的應(yīng)用實(shí)例21 獲得表單數(shù)據(jù) 實(shí)例22 頁(yè)面重定向程序示例實(shí)例23 定時(shí)刷新頁(yè)面程序示例實(shí)例24 記住會(huì)話的用戶名實(shí)例25 猜字母游戲實(shí)例26 網(wǎng)站計(jì)數(shù)器

標(biāo)簽： JSP 網(wǎng)絡(luò)編程實(shí)踐代碼

上傳時(shí)間： 2013-12-06

上傳用戶：bruce
if—else語(yǔ)句

if—else語(yǔ)句，SWITCH語(yǔ)句，循環(huán)結(jié)構(gòu)，do-while語(yǔ)句，for語(yǔ)句，跳轉(zhuǎn)語(yǔ)句

標(biāo)簽： else

上傳時(shí)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(biāo)簽： Description enhancement activities the

上傳時(shí)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(biāo)簽： Description enhancement activities the

上傳時(shí)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(biāo)簽： the decision clusters Cluster

上傳時(shí)間： 2013-12-21

上傳用戶：gxmm
VHDL實(shí)現(xiàn)循環(huán)碼編碼

VHDL實(shí)現(xiàn)循環(huán)碼編碼，設(shè)計(jì)了三個(gè)單元。SWITCH是一個(gè)開(kāi)關(guān)，shifter是移位寄存器，encoder是主體。

標(biāo)簽： VHDL 循環(huán)碼編碼

上傳時(shí)間： 2016-02-14

上傳用戶：cainaifa

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