《程序員面試攻略》程序員面試的經典書籍，非常的清晰，內容最完整。-: A classic book to read for people who ar
標簽： 程序員面試
上傳時間： 2013-07-03
上傳用戶：kbnswdifs
USB2．0接口和基于ARM核的SOC系統的應用已經非常廣泛，特別在電子消費類領域。包含USB2,0接口的ARM系統則更是市場的需求。本文介紹一種基于ARM核的USB2,0接口IP(AHB_USB2.0)的設計，主要對其中的串行接口引擎(SIE)的設計進行討論。 該 AHB_USB2.0 IP核支持USB2.0協議，并兼容USB1.1協議；支持AMBA2.0協議和UTMI 1.05協議。該IP核一側通過UTMI接口或ULPI接口的PHY與USB2.0主機端進行通信；另一側則通過AHB總線與ARM相連。 AHB_USB2.0 IP核在硬件上分為三個大模塊：ULPI模塊(ULPI)、串行接口引擎(SIE)模塊和AHB總線接口模塊(AHB)。ULPI模塊實現了UTMI接口轉ULPI接口。串行接口引擎(SIE)模塊為USB2.0的數據鏈路層協議處理模塊，為整個IP核的核心部分，進一步分為四個子模塊——GLC(全局控制模塊)，PIE(PHY接口處理引擎)，SIF(系統接口邏輯)和EPB(端點緩沖模塊)。GLC模塊負責整個IP的復位控制，IP時鐘的開關提示等；PIE模塊負責處理USB的事務級傳輸，包括組包解包等；SIF模塊負責協議相關寄存器組和端點緩沖區的讀寫，跨時鐘域信號的處理和PIE所需的控制信號的產生；AHB模塊負責IP核與ARM通信和DMA功能的實現。 該IP核的軟件設計遵循USB協議，Bulk Only協議和UFI協議，由外掛ARM實現USB設備命令和UFI命令的解析，并執行相應的操作。設計了IP核與ARM之間的多種數據傳輸方法，通過軟件實現常規數據讀寫訪問、內部DMA或外部DMA等多種方式的切換。 本IP已經通過EDA驗證和FPGA測試，并且已經在內嵌ARM核的FPGA系統上實現了多個U盤。這個FPGA系統的正確工作，證明了AHB_USB2.01P核設計是正確的。
上傳時間： 2013-05-17
上傳用戶：qqoqoqo
本論文以開發基于ARM核的USB2.0-AHB接口IP此項目為依托，致力于在Windows XP操作系統上使用DDK(Driver Development Kit)設計和開發一個基于WDM的主機端驅動程序。開發該驅動程序的目的是為了對該IP進行FPGA測試以及配合設備端驅動程序的開發，該驅動程序能夠完成即插即用功能，塊傳輸，同步傳輸，控制傳輸以及對Flash的操作五項主要功能。 論文首先介紹了基于WDM的USB驅動程序設計原理，其中包括了從結構到通信流對USB主機系統的介紹，編寫WDM驅動程序的基礎理論(主要介紹了數個相關的重要概念、驅動程序的基本組成)，以及在開發對Flash操作的例程會使用到的Mass Storage類協議的簡要介紹。在介紹設計原理后，論文從總體的系統應用環境和結構薊數據傳輸、內部模塊以及軟硬件體系結構幾個方面簡要描述了該IP的系統設計。接著論文通過分析主機端驅動程序功能需求，提出了驅動程序的總體構架以及分步式的設計流程，具體步驟是先實現驅動程序的正常加載以及基本PnP功能，然后實現塊傳輸、同步傳輸以及控制傳輸，最后完成對Flash操作例程的設計。隨后論文詳細闡述了對上述五項主要功能模塊的設計；其中對Flash操作例程的設計是難點，作者通過分析Bulk-Only協議和UFI命令規范，提出程序的詳細設計方案。論文最后簡要介紹了調試驅動程序的方法，以及驅動程序的測試內容、部分測試結果以及測試結論。 本論文研究對象為基于ARM核的USB2.0-AHB接口IP主機端驅動程序，因為其研究主體是一個基于WDM的主機端驅動程序，因此有其普遍性；但是它以開發基于ARM核的USB2.0-AHB接口IP這個項目為依托，其目的是為項目服務，因此它有其特殊性。它是一項既有普遍性又有特殊性的研究。
上傳時間： 2013-05-19
上傳用戶：2007yqing
FEATURES Unique 1-Wire interface requires only one port pin for communication Multidrop capability simplifies distributed temperature sensing applications Requires no external components Can be powered from data line. Power supply range is 3.0V to 5.5V Zero standby power required Measures temperatures from -55°C to +125°C. Fahrenheit equivalent is -67°F to +257°F ±0.5°C accuracy from -10°C to +85°C Thermometer resolution is programmable from 9 to 12 bits Converts 12-bit temperature to digital word in 750 ms (max.) User-definable, nonvolatile temperature alarm settings Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition) Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system
上傳時間： 2013-08-04
上傳用戶：CHENKAI
·詳細說明：C++寫的DTMF算法，內含一個pcm數據文件，讀入文件并分析按鍵-c writes the DTMF algorithm, contains a pcm data file, the read-in document and the analysis pressed key。文件列表: DTMF ....\DTMF.cpp ....\DTMF.
上傳時間： 2013-04-24
上傳用戶：Miyuki
讀取STM32芯片內部唯一的標識，用于加密等區別其他芯片的操作，有完整注釋，測試通過-STM32 chip to read a unique identifier for the encryption and other differences other chip operation, with complete notes, test
上傳時間： 2013-05-24
上傳用戶：793212294
Methods for designing a maintenance simulation training system for certain kind of radio are introduced. Fault modeling method is used to establish the fault database. The system sets up some typical failures， follow the prompts trainers can locate the fault source and confirm the type to accomplish corresponding fault maintenance training. A training evaluation means is given to examining and evaluating the training performance. The system intuitively and vividly shows the fault maintenance process， it can not only be used in teaching， but also in daily maintenance training to efficiently improve the maintenance operation level. Graphical programming language LabVIEW is used to develop the system platform.
上傳時間： 2013-11-19
上傳用戶：3294322651
Abstract: Most magnetic read head data sheets do not fully specify the frequency-dependent components andare often vague when specifying other key parameters. In some cases, the specifications of two very similarheads from two different manufacturers might be quite different in terms of parameters specified and omitted.The limitations in the data sheets make designing an optimum card reading system unnecessarily difficult andtime consuming. This document outlines a strategy to overcome the above shortcomings and offers guidelinesto overcome the noise issues.
上傳時間： 2013-11-13
上傳用戶：dysyase
Abstract: Transimpedance amplifiers (TIAs) are widely used to translate the current output of sensors like photodiode-to-voltagesignals, since several circuits and instruments can only accept voltage input. An operational amplifier with a feedback resistor fromoutput to the inverting input is the most straightforward implementation of such a TIA. However, even this simple TIA circuit requirescareful trade-offs among noise gain, offset voltage, bandwidth, and stability. Clearly stability in a TIA is essential for good, reliableperformance. This application note explains the empirical calculations for assessing stability and then shows how to fine-tune theselection of the feedback phase-compensation capacitor.
標簽： Transimpedance Stabilize Amplifier Your
上傳時間： 2013-11-13
上傳用戶：daoyue
Sensors for pressure, load, temperature, acceleration andmany other physical quantities often take the form of aWheatstone bridge. These sensors can be extremely linearand stable over time and temperature. However, mostthings in nature are only linear if you don’t bend them toomuch. In the case of a load cell, Hooke’s law states that thestrain in a material is proportional to the applied stress—as long as the stress is nowhere near the material’s yieldpoint (the “point of no return” where the material ispermanently deformed).
上傳時間： 2013-11-13
上傳用戶：墻角有棵樹
