SVN在Verilog HDL开发过程中的应用

Verilog HDL是最为流行的硬件描述语言之一.在其开发过程中,存在参与人员多,程序变更混乱等问题,因此,选择合适的版本控制工具是很有必要的.通过分析版本控制工具SVN的特性,提出利用SVN版本控制系统对Verilog HDL开发过程进行管理,以达到高效、便捷的目的.应用结果表明,该方法为团队协作编写Verilog HDL提出了一个切实可行的方案,为版本管理提供了可行规范.     

条码检测装置中CCD图像采集电路的设计

为了实现对条码的在线采集,对采集对象进行实时检测和进一步处理,基于FPGA芯片,利用Verilog语言采用自顶向下的设计方法对图像采集电路进行了设计。图像采集单元与上位机之间通过UART进行通信,通过编码器的控制实现对条码的图像采集。其中,使用硬件描述语言对于CCD和AD芯片驱动时序的实现方法进行了设计。经过平台调试,结果表明:基于FPGA的图像采集电路实现了图像的实时采集,为提高条码的检测速度和效率提供了保证。     

Influence of curcuma (Curcuma xanthorrhiza Roxb) on lipid metabolism in rabbits

The efficacy of curcuma (Curcuma xanthorrhiza) in lowering blood plasma lipid was evaluated in rabbits. Forty male New Zealand white rabbits (2.3 kg) were divided into four equal groups and offered isoatherogenic diets with no curcuma, low curcuma (2 g kg^?1), medium curcuma (3 g kg^?1) and high curcuma (4 g kg^?1) for 120 days. Faeces and feed samples were collected. Body weight was measured weekly. Blood samples at 1, 2 and 4 months and liver samples at the last blood collection were taken. Curcuma did not influence feed, protein and fat consumption and protein excretion (P > 0.05) but significantly (P < 0.05) increased fat excretion. Cholesterol concentration was decreased by 46.6, 56.4 and 63.2% and HDL concentration was decreased by 9.9, 14.5 and 21.9% at 2, 3 and 4 g kg^?1 curcuma respectively. Curcuma significantly (P < 0.05) decreased LDL concentration and significantly (P < 0.01) decreased triglyceride concentration by 20.4, 28.5 and 29.5% at 2, 3 and 4 g kg^?1 respectively. HMG‐CoA reductase inhibitor was significantly (P < 0.05) increased by curcuma. Glucose was significantly (P < 0.05) reduced by 6.2, 7.6 and 18.0% at 2, 3 and 4 g kg^?1 curcuma respectively. Lipid peroxidation was prevented at 3 and 4 g kg^?1 curcuma. The enhanced fat excretion could have been mediated through an acceleration of lipid metabolism from extrahepatic tissues to the liver, which would increase the excretion of cholesterol via the bile and into the faeces. Since this is central to lipid metabolism, curcuma has potential as a phytotherapeutic agent under atherosclerosis and cardiovascular disease conditions. © 2002 Society of Chemical Industry     

基于SOPC的运动目标图像检测系统设计

介绍了一种基于可编程片上系统SOPC的运动目标图像检测片上系统,该系统采用软/硬件协同设计的方法,使用Altera EP2C 35 FPGA芯片与OV5620视频摄像头配合实现了高速的数字图像处理,选用SDRAM和FLASH作为图像数据的外部存储器,满足了运动检测和保存现场的需要,同时借助ADV7123把数字图像信号转换为模拟信号送入VGA显示屏进行实时显示。并且设计采用Verilog HDL和C语言相结合使用硬件实现了系统的大部分功能,提高了系统的处理速度,具有良好的灵活性和适应性。     

I2C总线接口的FPGA实现研究

该文详细阐述了I2C总线接口的结构、工作原理,提出了复杂时序电路状态机嵌套的设计思想,并给出了基于VerilogHDL的I2C接口电路的描述。     

硬件描述语言VHDL的功能及优点

论述了可编程 Ａ Ｓ Ｉ Ｃ 在现代电子技术中的作用,在可编程 Ａ Ｓ Ｉ Ｃ 设计中采用的一种方法——— Ｖ Ｈ Ｄ Ｌ 硬件描述语言及用 Ｖ Ｈ Ｄ Ｌ 实现计数器的实例     

The effects of feeding conjugated linoleic acid (CLA) on rat growth performance,serum lipoproteins and subsequent lipid composition of selected rat tissues

Four groups of 12 albino rats (six males and six females), at 4 weeks of age, were fed for 60 days a semi‐synthetic diet containing graded amounts of conjugated linoleic acid (CLA; 0.0, 0.5, 1.0 and 1.5%) to determine its effect on growth performance and serum lipoprotein profiles and its incorporation into abdominal and muscle lipids. Rats fed CLA responded by significantly improved body mass gains; however, this effect was observed only with the 1.0% CLA‐supplemented diet. It was also true for feed conversion efficiency. The changes in serum total cholesterol (TC) and HDL cholesterol concentrations were insignificant and showed an opposite pattern. However, the resulting HDL cholesterol/TC ratio was significantly (P ≤ 0.01) increased. At the same time, serum triacylglycerol (TAG) concentrations were significantly (P ≤ 0.01) elevated, thus counteracting the potential antiatherogenicity of the improved HDL cholesterol/TC ratio. Feeding CLA to rats resulted in its substantial incorporation into both abdominal and muscle lipids. Generally, tissue lipids were enriched with CLA at the expense of long‐chain polyunsaturated fatty acids, eg linoleate and arachidonate. This effect is likely to correspond with reduction of arachidonate‐derived eicosanoid synthesis. These data together suggest that CLA has a potent effect on lipid transport and metabolism in rats. Also, they confirm the potential of nutritional methods to provide CLA‐enriched functional animal products, especially meat, for human consumption. © 2000 Society of Chemical Industry     

基于FPGA的数据记录器数据源的研究与实现

随着合成孔径雷达的飞速发展,对于数据记录器速度的要求越来越高。在这种情况下,如何检验其性能,特别是存储的速率与误码率显得十分关键。基于此,提出了1种基于FPGA的数据记录器数据源系统的设计方案。其中,在硬件方面,对低电压差分信号(LVDS)传输方式、Spartan-3系列FPGA的功能模块,以及系统编程调试模块进行了介绍;在软件方面,通过利用Verilog语言中的有限状态机(FSM)设计方法对核心程序等进行了编写与说明。     

一种MP3/AAC解码器ASIC的设计与实现

介绍了MPEG-1 Layer3(简称MP3)和AAC的音频解码器在ASIC上的VLSI实现，部分解码使用了软件来实现。整个ASIC利用USB传输，并为MP3和AAC解码设计了专用的DSP结构。实现的算法中，根据硬件的特点做了很多有效的优化，并用Verilog语言编写。使用中芯国际公司(SMIC)提供的0．18μm工艺库进行了仿真和综合。     

VHDL语言在现代数字系统中的应用

介绍了VHDL硬件描述语言在一个简单数字系统设计中的具体应用过程，论述了VHDL语言在基本结构和基本特征以及在现代数字系统中的重要地位和作用。