一种优化的射频IC接收电路

简要介绍射频IC系统的结构,并针对现有射频IC系统接收电路的不足,通过调整混频器增益、混频管之间距离和工作频率等方法,实现对接收电路的优化。通过仿真,证明了优化的有效性。     

Providing secure execution environments with a last line of defense against Trojan circuit attacks

Integrated circuits (ICs) are often produced in foundries that lack effective security controls. In these foundries, sophisticated attackers are able to insert malicious Trojan circuits that are easily hidden in the large, complex circuitry that comprises modern ICs. These so-called Trojan circuits are capable of launching attacks directly in hardware, or, more deviously, can facilitate software attacks. Current defense against Trojan circuits consists of statistical detection techniques to find such circuits before product deployment. The fact that statistical detection can result in false negatives raises the obvious questions: can attacks be detected post-deployment, and is secure execution nonetheless possible using chips with undetected Trojan circuits? In this paper we present the Secure Heartbeat And Dual-Encryption (SHADE) architecture, a compiler–hardware solution for detecting and preventing a subset of Trojan circuit attacks in deployed systems. Two layers of hardware encryption are combined with a heartbeat of off-chip accesses to provide a secure execution environment using untrusted hardware. The SHADE system is designed to complement pre-deployment detection techniques and to add a final, last-chance layer of security.     

闪电快电场信号时频特性的小波分析

应用小波变换方法将具有短时非平稳特点的闪电快电场时域波形信号转换到二维的时频平面,从时间和频率上同时描述闪电快电场信号的电场强度或相对能量分布,揭示其所包含的不同频率分量及其随时间变化的特性.分析结果表明,基于小波变换的闪电快电场信号时频特性分析可以挖掘闪电电场更深层次的变化规律和特征;也为闪电放电类型的识别研究提供了新的思路.     

基于FPGA的MDDI数据处理电路实现

介绍了一种基于FPGA的MDDI(mobile display digital interface)数据处理电路设计;基于单片集成AM-OLED驱动控制芯片的设计需求以及并行数据总线在移动显示设备上存在的不足,设计了MDDI数据处理电路;MDDI作为一种高速串行移动显示数字接口标准,具有连线数量少,信号传输可靠性高,低功耗等特点,广泛应用于移动显示终端领域;所设计的MDDI Type2主端数据处理电路采用两级状态机控制内部电路,主状态机用于控制从状态机的状态切换,从状态机则用于实现MDDI数据的生成;通过加入可配置寄存器,实现对数据包生成和接口模式的控制;采用Verilog语言编写RTL级代码实现MDDI Type2数据处理电路软核;使用Xilinx工具综合的结果表明,该数据处理电路能够支持480-RGB×320、26万色的AM-OLED显示屏,数据传输速率可达180 Mbps,其性能指标满足系统设计要求。     

逻辑综合在数字IC设计中的应用

随着数字IC的规模和复杂性不断增加,数字IC设计的难度也在加大,为了更好地进行数字IC设计,业界普遍采用了自动化的设计方式,通过应用工具软件,将IC设计的效率极大地提高.主要探讨了在IC设计当中逻辑综合方面的问题.     

A study of 3D Network-on-Chip design for data parallel H.264 coding

In this paper, we implement, analyze and compare different Network-on-Chip (NoC) architectures aiming at higher efficiencies for MPEG-4/H.264 coding. Two-dimensional (2D) and three-dimensional (3D) NoCs based on Non-Uniform Cache Access (NUCA) are analyzed. We present results using a full system simulator with realistic workloads. Experiments show the average network latencies in two 3D NoCs are reduced by 28% and 34% respectively, comparing with 2D design. It is also shown that heat dissipation is a trade-off in improving performance of 3D chips. Our analysis and experiment results provide a guideline to design efficient 3D NoCs for data parallel H.264 coding applications.     

IC卡预付费采暖购热系统的设计

为预付费采暖系统设计了用于供热中心主管部门依卡购热的IC卡购热系统,IC卡读写器主控芯片为单片机STC89C52RC,通过串口(或USB接口)与上位机通信,上位机软件采用LabVIEW开发,使用LabSQL实现了对数据库的管理。     

非接触IC卡应用系统设计

主要介绍非接触IC卡在考勤管理系统中的应用和实现。非接触IC卡读写系统是一种经高科技开发、研制、生产出来的新型管理系统 ,它具有操作方便、安全、可靠性高等优点。在考勤系统中 ,IC卡作为身份识别 ,实现了考勤管理的电子化。系统能准确反映出某一天中每一位职工或某一部门的出勤情况 ,为管理人员提供准确的考勤数据 ,并生成打印报表 ,供管理部门决策     

基于IC卡的水表及收费管理系统的设计与实现

本文介绍了一种基于IC卡的水表及收费管理系统的设计和实现,给出了系统的总体结构,并对其主要组成部分的原理和功能作了阐述。     

无人值守计算机房收费系统的解决方案

机房的自动化管理是由电子信息技术发展的必然结果,而计费系统的自动化是关键的一环。本文提出的几种无人值守计算机房收费系统的解决方案,都已在实践中得到了应用,并显现出各自的优势。