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In this paper, we discuss efficient coding and design styles using verilog. This can beimmensely helpful for any digital designer initiating designs. Here, we address different problems rangingfrom RTL-Gate Level simulation mismatch to race conditions in writing behavioral models. All theseproblems are accompanied by an example to have a better idea, and these can be taken care off if thesecoding guidelines are followed. Discussion of all the techniques is beyond the scope of this paper, however,here we try to cover a few of them.
標(biāo)簽： Efficient Verilog Digital Coding
上傳時(shí)間： 2013-11-23
上傳用戶：我干你啊
Abstract: As industrial control systems (ICSs) have become increasingly connected and use more off-the-shelfcomponents, new vulnerabilities to cyber attacks have emerged. This tutorial looks at three types of ICSs:programmable logic controllers (PLCs), supervisory control and data acquisition (SCADA) systems, anddistributed control systems (DCSs), and then discusses security issues and remedies. This document alsoexplains the benefits and limitations of two cryptographic solutions (digital signatures and encryption) andelaborates on the reasons for using security ICs in an ICS to support cryptography.
標(biāo)簽： 工業(yè)系統(tǒng) 安全問(wèn)題
上傳時(shí)間： 2013-10-09
上傳用戶：woshinimiaoye
Have you had the exasperating experience of a laptop orPDA defi antly not responding to your commands? Youfrantically press key after key, but to no avail. As hopeturns to anger (but just before you throw the company’slaptop through the window) you slam your fi nger againstthe on/off power button. Ten seconds later, your laptopfi nally surrenders and the screen goes black in a highpitched whimper.
標(biāo)簽： 427 DN 開(kāi)關(guān)控制器 故障保護(hù)
上傳時(shí)間： 2013-12-10
上傳用戶：Vici
QX5305 是一款高效率，穩(wěn)定可靠的高亮度LED燈驅(qū)動(dòng)控制IC，內(nèi)置高精度比較器，off-time控制電路，恒流驅(qū)動(dòng)控制電路等，特別適合大功率，多個(gè)高亮度LED燈串恒流驅(qū)動(dòng)。 QX5305采用固定off-time控制工作方式，其工作頻率可高達(dá)2.5MHz，可使外部電感和濾波電容、體積減少，效率提高。 在DIM腳加PWM信號(hào)，可調(diào)節(jié)LED燈的亮度。 通過(guò)調(diào)節(jié)外置的電阻，能控制高亮度LED燈的驅(qū)動(dòng)電流，使LED燈亮度達(dá)到預(yù)期恒定亮度，流過(guò)高亮度LED燈的電流可從幾毫安到2安培變化。 方框圖： 管腳排列圖： QX5305的特性 可編程驅(qū)動(dòng)電流，最高可達(dá)2A 高效率：最高達(dá)95% 寬輸入電壓范圍：2.5V~36V 高工作頻率：2.5MHz 工作頻率可調(diào)：500KHz~2.5MHz 驅(qū)動(dòng)LED燈功能強(qiáng)：LED燈串可從1個(gè)到幾十個(gè)LED高亮度燈 亮度可調(diào)：通過(guò)EN端PWM，調(diào)節(jié)LED燈亮度 QX5305應(yīng)用范圍 干電池供電LED燈串 LED燈杯 RGB大顯屏高亮度LED燈 平板顯示器LED背光燈 恒流充電器控制 通用恒流源。 工作原理簡(jiǎn)述： QX5305 采用峰值電流檢測(cè)和固定off-time控制方式。片內(nèi)的R-S觸發(fā)器分別由off-time定時(shí)器置位和CS比較器、FB比較復(fù)位，它控制外部MOSFET管并和功率電感 L、LED、肖特基二極管共同構(gòu)成一個(gè)自振蕩的，連續(xù)電感電流模式的升壓型恒流LED驅(qū)動(dòng)電路（參見(jiàn)圖1）。 除了固定off-time控制這點(diǎn)外，QX5305的工作方式和普通的電流模式PWM控制型DC/DC升壓電路非常相似。當(dāng)工作在連續(xù)電流模式下時(shí)，流過(guò)功率電感的電流IL如圖所示：
上傳時(shí)間： 2013-10-26
上傳用戶：TF2015
yright 2002 Cygnal Integrated Products, Inc. // // Filename: LIION_BC_MAIN.c // Target Device: 8051F300 // Created: 11 SEP 2002 // Created By: DKC // Tool chain: KEIL Eval C51 // // This is a stand alone battery charger for a Lithium ION battery. // It utilizes a buck converter, controlled by the on-chip 8-bit PWM, // to provide constant current followed by constant voltage battery charge.
標(biāo)簽： LIION_BC_MAIN Integrated Filename Products
上傳時(shí)間： 2013-12-23
上傳用戶：牧羊人8920
JILRuntime A general purpose, register based virtual machine (VM) that supports object-oriented features, reference counting (auto destruction of data as soon as it is no longer used, no garbage collection), exceptions (handled in C/C++ or virtual machine code) and other debugging features. Objects and functions can be written in virtual machine code, as well as in C or C++, or any other language that can interface to C object code. The VM is written for maximum performance and thus is probably not suitable for embedded systems where a small memory footprint is required. Possible uses of the VM are in game development, scientific research, or to provide a stand-alone, general purpose programming environment.
標(biāo)簽： object-oriented JILRuntime register supports
上傳時(shí)間： 2013-12-23
上傳用戶：cc1015285075
pic mcu code:This application note describes the design and implementation of a USB Mass Storage Device (MSD) using a Secure Digital card, which should prove useful to developers of USB mass storage solutions. This application may be used as a stand-alone MSD or as a Secure Digital/Multimedia Card (SD/MMC) reader/ writer interface.
標(biāo)簽： implementation application describes Storage
上傳時(shí)間： 2014-11-23
上傳用戶：天誠(chéng)24
TIMER.ASM ********* [ milindhp@tifrvax.tifr.res.in ] Set Processor configuration word as = 0000 0000 1010 b. a] -MCLR tied to VDD (internally). b] Code protection off. c] WDT disabled. d] Internal RC oscillator [4 MHZ].
標(biāo)簽： configuration Processor milindhp tifrvax
上傳時(shí)間： 2015-05-24
上傳用戶：wqxstar
The Hopfield model is a distributed model of an associative memory. Neurons are pixels and can take the values of -1 (off) or +1 (on). The network has stored a certain number of pixel patterns. During a retrieval phase, the network is started with some initial configuration and the network dynamics evolves towards the stored pattern which is closest to the initial configuration.
標(biāo)簽： model distributed associative Hopfield
上傳時(shí)間： 2015-06-17
上傳用戶：l254587896
Features • Compatible with MCS-51® Products • 8K Bytes of In-System Programmable (ISP) Flash Memory – Endurance: 1000 Write/Erase Cycles • 4.0V to 5.5V Operating Range • Fully Static Operation: 0 Hz to 33 MHz • Three-level Program Memory Lock • 256 x 8-bit Internal RAM • 32 Programmable I/O Lines • Three 16-bit Timer/Counters • Eight Interrupt Sources • Full Duplex UART Serial Channel • Low-power Idle and Power-down Modes • Interrupt Recovery from Power-down Mode • Watchdog Timer • Dual Data Pointer • Power-off Flag
標(biāo)簽： 8226 Programmable Compatible In-System
上傳時(shí)間： 2015-06-27
上傳用戶：dianxin61
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