电信号特性测量与设备

0612491 基于存储器SST39VF080的多通道数字信号源的设计 [刊,中]／高媛／／电子科技．-2006,(1)．-52-55(D) 0612492 在SoPC上实现的波形发生器[刊,中]／步凯／／单片机与嵌入式系统应用．-2006,(1)．-58-60(C)     

TMS320C6711的FLASH引导装载系统研究与设计

引导装载是DSP系统设计中必不可少的重要环节。文章对TI公司TMS320C6711中FLASH引导装载的概念、方法及特点做了详细阐述 ,同时以SST公司的FLASH存储器(SST39VF040)为例 ,设计了一个利用FLASH进行引导装载的系统方案 ,并给出了相应的自加载程序源代码。     

FLASH存储器与ADSP-TS101的接口电路设计及应用

ADSP Tiger SHARC系列是AD公司最新推出的高性能定／浮点数字信号处理器。本文结合ST公司的FLASH存储器SST39VF040，介绍Tiger SHARCTS101对FLASH存储器的操作方法，设计了TS101与FLASH存储器之间的接口电路和有关软件缩程。他可以在ADI公司提供的集成开发环境Visual DSP下，通过JTAG接口实现对FLASH存储器的读写访问；或者实现在TS101执行程序过程中对FLASH存储器进行直接访问。     

基于ARM LPC2210的嵌入式EOS通信终端设计与实现

针对国内物流行业现状,结合嵌入式应用技术,设计了应用于电子订货系统的嵌入式EOS终端.该终端以PHILIPS公司的ARM微处理器LPC2210为核心,外扩了外部静态存储器IS61LV25616AL和FLASH存储器SST39VF160,使用了专用的键盘控制芯片ZLG7290和看门狗监控芯片SP708S,采用SMG240128A点阵图型液晶作为显示模块,扩展了SD卡和UART/MODEM通信接口,最后在硬件基础上进行了应用软件的开发.该EOS终端采用了模块化设计,体积小,功能强,可采用有线PSTN和无线GPRS两种通信方式,具有很好的应用前景.     

TMS320C6713的FLASH引导装载系统设计

对TI公司生产的TMS320C6713中FLASH的引导装载概念和方法做了详细的阐述,同时以SST公司的FLASH芯片SST39VF400A为例,给出了一个利用FLASH进行引导装载的系统方案,并给出了相应的自动加载程序的设计和实现过程.     

TMS320C6713的FLASH引导装载系统的研究与设计

针对17公司的TMS320C6713中FLASH引导装载的概念、方法做了详细的阐述，同时以SST公司的FLASH（SST39VF400A）为例，设计了一个利用FLASH进行引导装载的系统方案，并给出了相应的自动加载程序的设计和实现过程。     

产业新闻

Microchip推出4 Mbit和8 Mbit 1.8 V低功耗存储器2015年1月20日,Microchip发布SST26WF080B和SST26WF040B新器件,扩展其1.8 V Serial Quad I/OTM(SQI)SuperFlash?系列存储器。新器件备有4 Mbit和8 Mbit两种存储容量,采用Microchip高性能SuperF lash技术制造,     

并行加载在TMS320VC5402上的实现

本文介绍了TI公司的定点DSP TMSC320VC5402从外部FLASH SST39VF400并行加载用户程序的实现方法及过程.     

TMS320C6201与Flash RAM的接口设计与编程技术

文章以SST39VF0 4 0为例 ,详细介绍了TI公司的高性能数字信号处理芯片TMS32 0C6 2 0 1与FlashRAM的接口设计 ,以及具体的编程方法     

利用仿真器接口实现TMS320C6X DSP FLASH的烧写及应用程序自引导

在一些脱机运行的DSP应用中，通常需要在系统加电后自行将代码从外扩存储器中装载到内部DSP中去执行，实现此种功能的系统称为引导装载系统。这是DSP开发中的重点和难点之一，关系到系统的可靠性和处理速度。文中详细分析了TI公司TMS320C6X DSP的引导加载过程及原理，在此基础上设计并实现了主机(PC机)利用仿真器通过JTAG口实现对DSP外部配置的FLASH存储器的在线编程。并以TI公司的DSP(TMS320C6701)结合ST公司的FLASH存储器(SST39VF040)为例，详细叙述了从FLASH引导程序的实现方法，并针对其中重要的命令文件和用户引导程序，给出了相应的示例文件和部分源代码。     

uClinux下Nor Flash的JFFS2文件系统构建

目前的嵌入式系统多使用FLASH作为主存，因此，如何有效管理FLASH上的数据非常重要。文章以SST39VF160芯片为例，讨论了在NorFlash上建立uClinux的JFFS2文件系统的一般步骤，从而为FLASH上的数据管理提供了理想的选择方式。     

A Technique of PCM Transmission over 2 GHz Microwave Radio

The application of multiplexed PCM channels to a microwave radio system is attractive in areas where geographic terrain limits the practicality of cable plant construction. A technique of interfacing the digital signal with an analog radio baseband is described. The successful Inclusion of a voice-frequency (VF) orderwire at the low frequency end of the digital spectrum without a significant penalty in error-rate performance demonstrates the efficiency of the technique.     

一种C55x DSP的串行引导与程序加密方法

以TI公司的TMS320VC5509A和SST公司的SST25LF080A为例,介绍了一种通过串口模式对Flash中的程序进行二次加载和加密方法。文中还给出了相关硬件连接、自举表的建立。实验证明,采用该引导装载系统具有较强的实用性,可以提高DSP软件的保密性。     

CCS下TMS320C6416 DSP的二次引导及FLASH在线编程方法研究

要实现DSP系统的用户代码自动加载,其二次引导及FLASH在线编程技术是重点和难点。基于TMS320C6416 DSP,详细论述了如何在CCS下配置存储区、代码段和数据段,编写二次引导程序,及如何将COFF文件转换为便于FLASH烧写的.hex文件。并以SST39VF040 FLASH为例,介绍了通过CCS擦写FLASH,实现FLASH在线编程的方法。并给出了相应的代码。     

Improving the convergence of vector fitting for equivalent circuit extraction from noisy frequency responses

The vector fitting (VF) algorithm has become a common tool in electromagnetic compatibility and signal integrity studies. This algorithm allows the derivation of a rational approximation to the transfer matrix of a given linear structure starting from measured or simulated frequency responses. This paper addresses the convergence properties of a VF when the frequency samples are affected by noise. We show that small amounts of noise can seriously impair or destroy convergence. This is due to the presence of spurious poles that appear during the iterations. To overcome this problem we suggest a simple modification of the basic VF algorithm, based on the identification and removal of the spurious poles. Also, an incremental pole addition and relocation process is proposed in order to provide automatic order estimation even in the presence of significant noise. We denote the resulting algorithm as vector fitting with adding and skimming (VF-AS). A thorough validation of the VF-AS algorithm is presented using a Monte Carlo analysis on synthetic noisy frequency responses. The results show excellent convergence and significant improvements with respect to the basic VF iteration scheme. Finally, we apply the new VF-AS algorithm to measured scattering responses of interconnect structures and networks typical of high-speed digital systems.     

高速数字信号处理器扩展存储空间的设计方案

基于TI公司的高速数字信号处理器芯片．详细描述美国SST公司推出的28SF040闪存芯片的性能特点、引脚功能，同时给出用其扩展DSP芯片的程序存储器空间的硬件设计电路与软件编程方法。     

Investigation of 9.6 kb/s data transmission via a pcm link at 64 kb/s with and without link errors

The problem of pulse code modulation (PCM) bit errors causing voice frequency (VF) modem errors has been studied in detail. The error mechanism consists of the addition of an impulse response type error signal added to the reconstructed VF data signal waveform at the digital-to-analogue (D/A) output of the PCM decoder. This error signal may cause a burst of errors registering in the VF modem receiver, depending on which PCM bit is in error. Numerous data have been collected in a laboratory experiment and analysed in various ways. The average bit error rate (BER) enhancement factor of VF data over PCM is between 10 and 20. For each PCM bit in error, an average of two VF data bits are in error. The analysis leads to suggestions for possible solutions to the problem.     

A simple time domain algorithm for the detection of ventricular fibrillation in electrocardiogram

Ventricular fibrillation (VF) is the most serious variety of arrhythmia which requires quick and accurate detection to save lives. In this paper, we propose a new time domain algorithm, called threshold crossing sample count (TCSC), which is an improved version of the threshold crossing interval (TCI) algorithm for VF detection. The algorithm is based on an important feature of the VF signal which relies on the random behavior of the electrical heart vector. By two simple operations: comparison and count, the technique calculates an effective measure which is used to separate life-threatening VF from other heart rhythms. For assessment of the performance of the algorithm, the method is applied on the complete MIT-BIH arrhythmia and CU databases, and a promising good performance is observed. Seven other classical and new VF detection algorithms, including TCI, have been simulated and comparative performance results in terms of different quality parameters are presented. The TCSC algorithm yields the highest value of the area under the receiver operating characteristic curve (AUC). The new algorithm shows strong potential to be applied in clinical applications for faster and accurate detection of VF.