This book evolved over the past ten years from a set of lecture notes developed while teaching the undergraduate Algorithms course at Berkeley and U.C. San Diego. Our way of teaching this course evolved tremendously over these years in a number of directions, partly to address our students' background (undeveloped formal skills outside of programming), and partly to reect the maturing of the eld in general, as we have come to see it. The notes increasingly crystallized into a narrative, and we progressively structured the course to emphasize the ?story line? implicit in the progression of the material. As a result, the topics were carefully selected and clustered. No attempt was made to be encyclopedic, and this freed us to include topics traditionally de-emphasized or omitted from most Algorithms books.
標簽: Algorithms 算法
上傳時間: 2013-11-11
上傳用戶:JamesB
使用Nios II軟件構建工具 This chapter describes the Nios® II Software Build Tools (SBT), a set of utilities and scripts that creates and builds embedded C/C++ application projects, user library projects, and board support packages (BSPs). The Nios II SBT supports a repeatable, scriptable, and archivable process for creating your software product. You can invoke the Nios II SBT through either of the following user interfaces: ■ The Eclipse™ GUI ■ The Nios II Command Shell The purpose of this chapter is to make you familiar with the internal functionality of the Nios II SBT, independent of the user interface employed.
上傳時間: 2013-10-12
上傳用戶:china97wan
The Virtex™-4 user access register (USR_ACCESS_VIRTEX4) is a 32-bit register thatprovides direct access to bitstream data by the FPGA fabric. It is useful for loadingPowerPC™ 405 (PPC405) processor caches and/or other data into the FPGA after the FPGAhas been configured, thus achieving partial reconfiguration. The USR_ACCESS_VIRTEX4register is programmed through the bitstream with a command that writes a series of 32-bitwords.
標簽: USR_ACCESS PowerPC XAPP 719
上傳時間: 2013-12-23
上傳用戶:yuanwenjiao
We would like to welcome you as a user of the Allegro CX, a rugged, handheld fi eld PC for data collection. Developed with the input of data collection professionals worldwide, the Allegro CX is adaptable and versatile for use in a wide variety of data collection environments. The Allegro CX continues to utilize our ergonomic, lightweight design that is standard in our line of Allegro Field PCs. This design makes your Allegro easy to use for extended periods while moving to and from data collection sites in the fi eld.
上傳時間: 2015-01-02
上傳用戶:zhangyi99104144
LAYOUT REPORT .............. 1 目錄.................. 1 1. PCB LAYOUT 術語解釋(TERMS)......... 2 2. Test Point : ATE 測試點供工廠ICT 測試治具使用............ 2 3. 基準點 (光學點) -for SMD:........... 4 4. 標記 (LABEL ING)......... 5 5. VIA HOLE PAD................. 5 6. PCB Layer 排列方式...... 5 7.零件佈置注意事項 (PLACEMENT NOTES)............... 5 8. PCB LAYOUT 設計............ 6 9. Transmission Line ( 傳輸線 )..... 8 10.General Guidelines – 跨Plane.. 8 11. General Guidelines – 繞線....... 9 12. General Guidelines – Damping Resistor. 10 13. General Guidelines - RJ45 to Transformer................. 10 14. Clock Routing Guideline........... 12 15. OSC & CRYSTAL Guideline........... 12 16. CPU
上傳時間: 2013-10-29
上傳用戶:1234xhb
PCB設計問題集錦 問:PCB圖中各種字符往往容易疊加在一起,或者相距很近,當板子布得很密時,情況更加嚴重。當我用Verify Design進行檢查時,會產生錯誤,但這種錯誤可以忽略。往往這種錯誤很多,有幾百個,將其他更重要的錯誤淹沒了,如何使Verify Design會略掉這種錯誤,或者在眾多的錯誤中快速找到重要的錯誤。 答:可以在顏色顯示中將文字去掉,不顯示后再檢查;并記錄錯誤數目。但一定要檢查是否真正屬于不需要的文字。 問: What’s mean of below warning:(6230,8330 L1) Latium Rule not checked: COMPONENT U26 component rule.答:這是有關制造方面的一個檢查,您沒有相關設定,所以可以不檢查。 問: 怎樣導出jop文件?答:應該是JOB文件吧?低版本的powerPCB與PADS使用JOB文件。現在只能輸出ASC文件,方法如下STEP:FILE/EXPORT/選擇一個asc名稱/選擇Select ALL/在Format下選擇合適的版本/在Unit下選Current比較好/點擊OK/完成然后在低版本的powerPCB與PADS產品中Import保存的ASC文件,再保存為JOB文件。 問: 怎樣導入reu文件?答:在ECO與Design 工具盒中都可以進行,分別打開ECO與Design 工具盒,點擊右邊第2個圖標就可以。 問: 為什么我在pad stacks中再設一個via:1(如附件)和默認的standardvi(如附件)在布線時V選擇1,怎么布線時按add via不能添加進去這是怎么回事,因為有時要使用兩種不同的過孔。答:PowerPCB中有多個VIA時需要在Design Rule下根據信號分別設置VIA的使用條件,如電源類只能用Standard VIA等等,這樣操作時就比較方便。詳細設置方法在PowerPCB軟件通中有介紹。 問:為什么我把On-line DRC設置為prevent..移動元時就會彈出(圖2),而你們教程中也是這樣設置怎么不會呢?答:首先這不是錯誤,出現的原因是在數據中沒有BOARD OUTLINE.您可以設置一個,但是不使用它作為CAM輸出數據. 問:我用ctrl+c復制線時怎設置原點進行復制,ctrl+v粘帖時總是以最下面一點和最左邊那一點為原點 答: 復制布線時與上面的MOVE MODE設置沒有任何關系,需要在右鍵菜單中選擇,這在PowerPCB軟件通教程中有專門介紹. 問:用(圖4)進行修改線時拉起時怎總是往左邊拉起(圖5),不知有什么辦法可以輕易想拉起左就左,右就右。答: 具體條件不明,請檢查一下您的DESIGN GRID,是否太大了. 問: 好不容易拉起右邊但是用(圖6)修改線怎么改怎么下面都會有一條不能和在一起,而你教程里都會好好的(圖8)答:這可能還是與您的GRID 設置有關,不過沒有問題,您可以將不需要的那段線刪除.最重要的是需要找到布線的感覺,每個軟件都不相同,所以需要多練習。 問: 尊敬的老師:您好!這個圖已經畫好了,但我只對(如圖1)一種的完全間距進行檢查,怎么錯誤就那么多,不知怎么改進。請老師指點。這個圖在附件中請老師幫看一下,如果還有什么問題請指出來,本人在改進。謝!!!!!答:請注意您的DRC SETUP窗口下的設置是錯誤的,現在選中的SAME NET是對相同NET進行檢查,應該選擇NET TO ALL.而不是SAME NET有關各項參數的含義請仔細閱讀第5部教程. 問: U101元件已建好,但元件框的拐角處不知是否正確,請幫忙CHECK 答:元件框等可以通過修改編輯來完成。問: U102和U103元件沒建完全,在自動建元件參數中有幾個不明白:如:SOIC--》silk screen欄下spacing from pin與outdent from first pin對應U102和U103元件應寫什么數值,還有這兩個元件SILK怎么自動設置,以及SILK內有個圓圈怎么才能畫得與該元件參數一致。 答:Spacing from pin指從PIN到SILK的Y方向的距離,outdent from first pin是第一PIN與SILK端點間的距離.請根據元件資料自己計算。
上傳時間: 2014-01-03
上傳用戶:Divine
阻抗匹配 阻抗匹配(Impedance matching)是微波電子學里的一部分,主要用于傳輸線上,來達至所有高頻的微波信號皆能傳至負載點的目的,不會有信號反射回來源點,從而提升能源效益。 大體上,阻抗匹配有兩種,一種是透過改變阻抗力(lumped-circuit matching),另一種則是調整傳輸線的波長(transmission line matching)。 要匹配一組線路,首先把負載點的阻抗值,除以傳輸線的特性阻抗值來歸一化,然后把數值劃在史密夫圖表上。 把電容或電感與負載串聯起來,即可增加或減少負載的阻抗值,在圖表上的點會沿著代表實數電阻的圓圈走動。如果把電容或電感接地,首先圖表上的點會以圖中心旋轉180度,然后才沿電阻圈走動,再沿中心旋轉180度。重覆以上方法直至電阻值變成1,即可直接把阻抗力變為零完成匹配。 由負載點至來源點加長傳輸線,在圖表上的圓點會沿著圖中心以逆時針方向走動,直至走到電阻值為1的圓圈上,即可加電容或電感把阻抗力調整為零,完成匹配.........
標簽: 阻抗匹配
上傳時間: 2013-10-20
上傳用戶:ZOULIN58
標簽: nbsp Transmission Line Ca
上傳時間: 2013-11-14
上傳用戶:defghi010
Accurate measurement of the third order intercept pointfor low distortion IC products such as the LT5514 requirescertain precautions to be observed in the test setup andtesting procedure. The LT5514 linearity performance ishigh enough to push the test equipment and test set-up totheir limits. A method for accurate measurement of thirdorder intermodulation products, IM3, with standard testequipment is outlined below.It is also important to correctly interpret the LT5514specification with respect to ROUT, and the impact ofdemo-board transmission-line termination loss whenevaluating the linearity performance, as explained in theLT5514 Datasheet and in Note 1 of this document.
上傳時間: 2013-11-14
上傳用戶:l254587896
8051微控制器上的 DES encryption/decryption used in IC smart cards. Software hasn t been validated and lacks in-line documentation.
標簽: encryption decryption validated Software
上傳時間: 2015-01-13
上傳用戶:wangdean1101