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2012 25th International Conference on VLSI Design最新文献

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Real-Time, Content Aware Camera -- Algorithm -- Hardware Co-Adaptation for Minimal Power Video Encoding 实时,内容感知摄像机-算法-硬件协同适应最小功耗视频编码
Pub Date : 2012-01-07 DOI: 10.1109/VLSID.2012.78
J. W. Wells, Jayaram Natarajan, A. Chatterjee, I. Barlas
In this paper, a content aware, low power video encoder design is presented in which the algorithms and hardware are co-optimized to adapt concurrently to video content in real-time. Natural image statistical models are used to form spatiotemporal predictions about the content of future frames. A key innovation in this work is that that the predictions are used as parameters in a feedback control loop to intelligently down sample (change the resolution of the frame image across different parts of the image) the video encoder input immediately at the camera, thus reducing the amount of work required by the encoder per frame. A multiresolution frame representation is used to produce regular data structures which allow for efficient hardware design. The hardware is co-optimized with the algorithm to reduce power based on the reduced input size resulting from the algorithm. The design also allows for selectable, graceful degradation of video quality while reducing power consumption.
本文提出了一种内容感知的低功耗视频编码器设计方案,该方案通过对算法和硬件的协同优化,使其能够同时适应实时视频内容。使用自然图像统计模型对未来帧的内容进行时空预测。这项工作的一个关键创新是,预测被用作反馈控制回路中的参数,以智能地降低采样(改变图像不同部分的帧图像分辨率),并立即在摄像机处输入视频编码器,从而减少编码器每帧所需的工作量。多分辨率帧表示用于生成规则的数据结构,从而实现高效的硬件设计。硬件与算法协同优化,基于算法减小的输入大小来降低功耗。该设计还允许选择,优雅的视频质量下降,同时降低功耗。
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引用次数: 4
Tutorial T8B: Wireless System Design and Systems Engineering Challenges 教程T8B:无线系统设计和系统工程挑战
Pub Date : 2012-01-07 DOI: 10.1109/VLSID.2012.37
Kameswara Rao, M. B. Reddy, Ravi Kishore
Summary form only given: Pervasiveness of wireless technology is impacting every aspect of the society and is becoming a de facto feature of any electronic product. This tutorial provides a comprehensive overview of wireless system design and brings out the systems engineering issues through real-life design case studies. It begins with an overview of a typical wireless system and the underlying RF technology. Next, a detailed view of wireless system design with mathematical underpinning of concepts and design of sub-systems will be presented; it highlights systems engineering issues in wireless product development. Subsequently, the tutorial presents the relevant system design case studies, for various wireless applications viz; medical electronics, consumer electronics, defense, telecommunications etc., and explains the methodologies to address the systems engineering issues. Finally, the tutorial explains the trends in future wireless systems design and the associated challenges. The last session concludes the tutorial, followed by a discussion.
无所不在的无线技术正在影响着社会的方方面面,并且正在成为任何电子产品的事实上的特征。本教程提供了无线系统设计的全面概述,并通过现实生活中的设计案例研究提出了系统工程问题。它首先概述了一个典型的无线系统和底层射频技术。接下来,将详细介绍无线系统设计的概念和子系统设计的数学基础;它强调了无线产品开发中的系统工程问题。随后,本教程介绍了各种无线应用的相关系统设计案例研究,即;医疗电子,消费电子,国防,电信等,并解释了解决系统工程问题的方法。最后,本教程解释了未来无线系统设计的趋势和相关的挑战。最后一个环节结束本教程,然后是讨论。
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引用次数: 0
A Fast Equation Free Iterative Approach to Analog Circuit Sizing 模拟电路尺寸的快速无方程迭代方法
Pub Date : 2012-01-07 DOI: 10.1109/VLSID.2012.99
S. Maji, P. Mandal
A fast equation free iterative approach for sizing of analog circuit is proposed. Equation based sizing approach has been popular as it removes time consuming simulation effort. If equations are cast in posynomial inequality format, a special optimization technique called geometric programming(GP) can be deployed. The advantage of formulating the problem in GP form is that, it ensures global optimality and can return the final design point instantly even in the presence of hundreds of equation and thousands of variable. But main limitation comes in deriving performance equations in posynomial inequality format. In this context, we develop one novel methodology for fast sizing of analog circuit. This method does not require any such performance expressions. It is based on the meaningful presentation of only device constraints. Infeasibility is handled iteratively making suitable changes on those constraints. Due to the simplicity of formulation, fully automated flow is achieved.
提出了一种快速求解模拟电路尺寸的无方程迭代方法。基于方程的分级方法由于消除了耗时的仿真工作而受到欢迎。如果方程以多项式不等式格式进行转换,则可以使用一种称为几何规划(GP)的特殊优化技术。以GP形式表述问题的优点是,即使存在数百个方程和数千个变量,也能保证全局最优性,并能立即返回最终设计点。但主要的局限性在于以多项式不等式的形式推导性能方程。在此背景下,我们开发了一种新的方法来快速调整模拟电路的尺寸。此方法不需要任何此类性能表达式。它只基于设备约束的有意义的表示。对这些约束进行适当的更改,迭代地处理不可行性。由于配方简单,实现了全自动流程。
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引用次数: 5
Tutorial T4: Intellectual Property Protection and Security in System-on-Chip Design 第4课:片上系统设计中的知识产权保护与安全
Pub Date : 2012-01-07 DOI: 10.1109/VLSID.2012.31
S. Sur-Kolay, S. Bhunia
Gigascale integration in recent semiconductor technology mandates design reuse in order to meet the design specifications in time. Electronic description of VLSI design being an intellectual property (IP), may be infringed upon during design reuse. This calls for incorporating techniques for intellectual property protection in the VLSI design flow. The IP of VLSI design, which culminates in fabrication of the integrated circuit, differs from other sources of IPs because in addition to its physical and structural description, it has also a behavioral specification which should remain unaltered after application of IP protection techniques. Security in activation of chips, especially in embedded systems, is an equally grave issue and has led to the paradigm of design-for-security. This tutorial aims at presenting the major concerns related to IP security that are significant to both the circuit designers and developers of CAD tools. The nature of threats are broadly categorized as (i) misappropriation by hacking during electronic commerce and intentional reselling mostly at design level, and (ii) unauthorized design retrieval. Various attack models and the mechanisms for effective counter measures such as encryption, obfuscation, watermarking and fingerprinting, and certain analytic methods derived from the behavioral aspect, specific to chip designs, will be discussed. First, the scenario of digital rights management, attack models and security goals will be described. Next, the existing approaches for protection of soft IPs such as HDL codes, firm IPs especially at the value-added layout level, and hard IPs including DFM-enhanced layout will be presented. This will include a number of published research results by the presenters. Finally, the recent advances in tackling security issues for design of smart cards and crypto processors will be surveyed.
在最近的半导体技术中,千兆级集成要求设计重用,以便及时满足设计规范。超大规模集成电路设计的电子描述是一项知识产权,在设计重复使用过程中可能会受到侵犯。这就要求在VLSI设计流程中纳入知识产权保护技术。VLSI设计的IP在集成电路的制造中达到顶峰,它与其他IP来源不同,因为除了其物理和结构描述外,它还有一个行为规范,在应用IP保护技术后应该保持不变。芯片激活的安全性,特别是在嵌入式系统中,是一个同样严重的问题,并导致了为安全而设计的范式。本教程旨在介绍与IP安全相关的主要问题,这些问题对电路设计人员和CAD工具开发人员都很重要。威胁的性质大致分为(i)在电子商务期间被黑客盗用和主要在设计层面故意转售,以及(ii)未经授权的设计检索。将讨论各种攻击模型和有效对抗措施的机制,如加密,混淆,水印和指纹,以及特定于芯片设计的行为方面的某些分析方法。首先,描述了数字权限管理的场景、攻击模型和安全目标。接下来,将介绍现有的软知识产权保护方法,如HDL代码,特别是增值布局级别的公司知识产权,以及包括dfm增强布局的硬知识产权。这将包括演讲者发表的一些研究成果。最后,将调查解决智能卡和加密处理器设计安全问题的最新进展。
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引用次数: 3
Tutorial T1: Design of Mixed-Signal Systems using SystemC AMS Extensions 教程T1:使用SystemC AMS扩展设计混合信号系统
Pub Date : 2012-01-07 DOI: 10.1109/VLSID.2012.28
Sumit Adhikari, Markus Damm, C. Grimm, F. Pêcheux
SystemC has become an accepted standard for design of HW/SW Systems at system level. How-ever, nowadays systems include more and more analog/RF components such as transceivers, sensor interfaces, or PLL. To enable design of such mixed-signal systems, OSCI has standardized AMS extensions for SystemC in 2010. In addition to the capabilities of SystemC for modelling multi-processor HW/SW systems, the AMS extensions enable modelling the behaviour of analog/RF parts, physical environment and digital signal processing methods. The tutorial gives an introduction into SystemC AMS extensions. The introduction includes the language itself, some simple examples, use cases and (top-down) methodology for refinement of AMS systems, starting from an executable specification.
SystemC已成为系统级硬件/软件系统设计的公认标准。然而,如今的系统包括越来越多的模拟/射频组件,如收发器,传感器接口或锁相环。为了实现这种混合信号系统的设计,OSCI在2010年为SystemC标准化了AMS扩展。除了SystemC建模多处理器硬件/软件系统的功能外,AMS扩展还可以建模模拟/射频部件的行为、物理环境和数字信号处理方法。本教程介绍了SystemC AMS扩展。介绍包括语言本身、一些简单的示例、用例和用于细化AMS系统的(自顶向下的)方法,从可执行规范开始。
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引用次数: 0
Synthesis of Reversible Circuits Using Heuristic Search Method 基于启发式搜索法的可逆电路综合
Pub Date : 2012-01-07 DOI: 10.1109/VLSID.2012.92
K. Datta, G. Rathi, I. Sengupta, H. Rahaman
Reversible circuits are of vital importance in many applications involving low power design. One of the principle areas where reversible circuits play great role is quantum computing. One of the foremost requirements of quantum computation is that it requires all the circuits that are used should be reversible in nature. Reversible circuit is one which maps an individual input vector to a singular output vector. Because of its application in many areas including quantum computing, many synthesis approaches have been developed. In this paper we focus on a synthesis approach which is based on permutation theory and heuristic search. An artificial intelligence based search technique A* is used to find near optimal solutions. Experimental results demonstrate that the proposed approach provides solutions within a very reasonable span of time.
可逆电路在许多涉及低功耗设计的应用中是至关重要的。量子计算是可逆电路发挥重要作用的主要领域之一。量子计算最重要的要求之一是,它要求所使用的所有电路本质上都是可逆的。可逆电路是将单个输入矢量映射到单个输出矢量的电路。由于它在包括量子计算在内的许多领域的应用,许多合成方法被开发出来。本文重点研究了一种基于置换理论和启发式搜索的综合方法。使用基于人工智能的搜索技术A*来寻找接近最优解。实验结果表明,该方法在合理的时间范围内提供了解决方案。
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引用次数: 22
Eliminating Performance Penalty of Scan 消除扫描的性能损失
Pub Date : 2012-01-07 DOI: 10.1109/VLSID.2012.95
O. Sinanoglu
Stringent performance requirements magnify the performance degradation impact of Design-for-Testability (DfT) techniques. As more aggressive performance optimizations are being employed, resulting in high-performance designs with reduced logic depth, the impact of scan multiplexers is becoming even more magnified. In this work, we propose a scan cell transformation technique that transfers the scan multiplexer delay from the input of the flip-flop to its output, enabling the removal of the scan multiplexer delay off the critical paths. By inserting a few shadow flip-flops properly, the proposed transformation technique retains test development (test data, quality, etc.) and application (test time, power dissipation, etc.) intact, fully complying with the conventional design and test flow. Experimental results justify the efficacy of the proposed techniques in eliminating the performance penalty of scan quickly and cost-effectively, and thus in enhancing functional speed of integrated circuits.
严格的性能要求放大了可测试性设计(DfT)技术的性能下降影响。随着更积极的性能优化被采用,导致逻辑深度降低的高性能设计,扫描多路复用器的影响变得更加放大。在这项工作中,我们提出了一种扫描单元转换技术,该技术将扫描多路复用器延迟从触发器的输入传输到其输出,从而能够从关键路径上去除扫描多路复用器延迟。通过适当插入一些影子触发器,所提出的转换技术完整地保留了测试开发(测试数据、质量等)和应用(测试时间、功耗等),完全符合常规的设计和测试流程。实验结果证明了该方法能够快速、经济地消除扫描的性能损失,从而提高集成电路的功能速度。
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引用次数: 6
A 55-mW 300MS/s 8-bit CMOS Parallel Pipeline ADC 55mw 300MS/s 8位CMOS并行流水线ADC
Pub Date : 2012-01-07 DOI: 10.1109/VLSID.2012.44
M. K. Hati, T. K. Bhattacharyya
This paper describes 8-bit 300MS/s 7-stages parallel pipeline ADC with 1.5-bit per stage and power efficient architecture is designed by sharing an amplifier between two pipeline stages, introducing the proper clock timing between the two parallel stages. This architecture is realized by eight no. of amplifier and the sample hold architecture is designed by using double sampling sample hold (DSSH) technique. A wide swing and wide bandwidth regulated folded cascode and power efficient dynamic comparator has been developed to further reduce the power consumption of the pipeline ADC. The ADC is implemented in 0.18 μm CMOS process technology, achieves 57.40 dB spurious free dynamic range (SFDR), 49.078 dB signal to noise distortion ratio (SNDR), 7.86 effective no of bit (ENOB) and consumes 55 mW from 1.8 V supply. The resulting figure of merit (FOM) is 0.789 PJ/conversion step.
本文介绍了一种8位300MS/s的7级并行流水线ADC,每级1.5位,通过在两个流水线级之间共享一个放大器,并在两个并行级之间引入适当的时钟时序,设计了低功耗的架构。这个结构是由8个节点实现的。采用双采样采样保持(DSSH)技术设计了放大器和采样保持结构。为了进一步降低流水线ADC的功耗,我们开发了一种宽摆幅、宽带宽可调的折叠级联码和低功耗动态比较器。该ADC采用0.18 μm CMOS工艺,实现57.40 dB无杂散动态范围(SFDR)、49.078 dB信噪比(SNDR)、7.86有效位元数(ENOB),功耗为55 mW,电源电压为1.8 V。所得的优值(FOM)为0.789 PJ/转换步长。
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引用次数: 5
Width-Aware Fine-Grained Dynamic Supply Gating: A Design Methodology for Low-Power Datapath and Memory 宽度感知的细粒度动态供应门控:一种低功耗数据路径和存储器的设计方法
Pub Date : 2012-01-07 DOI: 10.1109/VLSID.2012.94
L. Wang, Somnath Paul, S. Bhunia
With increasing contribution of leakage in total active power, run-time leakage control techniques are becoming extremely important. Supply gating provides an effective, low-overhead and technology scalable approach for active leakage reduction through the well-known "stacking effect". However, conventional supply gating approaches are typically coarse-grained in both space and time - i.e. are applied to large data path or memory blocks when an entire logic/memory block is idle for sufficiently long period. They suffer from limited applicability at run time. On the other hand, fine-grained supply gating is constrained primarily by the large wake-up delay and wake-up power overhead. In this paper, we propose a novel fine-grained width-aware dynamic supply gating (WADSG) approach to reduce both active leakage and redundant switching power in data path and embedded memory (e.g. L1/L2 cache). The approach exploits the abundance of narrow-width (NW) operands in general-purpose and embedded applications to "supply-gate" unused parts of integer execution units and memory blocks while they are in use. We introduce a novel levelized gating strategy to virtually eliminate the wake-up delay overhead. We employ the proposed WADSG approach to a super scalar processor. To reduce the wake-up power we use a width aware instruction issue policy. In case of L1 and L2 cache, we store the width information per "ways" of associative cache and supply-gate the most significant bits of the NW ways. We also propose a width-aware block allocation and replacement policy to maximize the number of NW ways. Simulation results for 45nm technology with Spec2k benchmarks show major savings (34.5%) in total processor power (considering both switching and active leakage power) with no performance impact. As a by-product, the proposed scheme also improves the thermal profile of both data path and memory.
随着泄漏在总有功功率中所占的比重越来越大,运行时泄漏控制技术显得尤为重要。电源门控通过众所周知的“堆叠效应”,为主动减少泄漏提供了一种有效、低开销和技术可扩展的方法。然而,传统的供应门控方法通常在空间和时间上都是粗粒度的——也就是说,当整个逻辑/内存块空闲足够长的时间时,应用于大数据路径或内存块。它们在运行时的适用性有限。另一方面,细粒度供应门控主要受到较大唤醒延迟和唤醒功率开销的限制。在本文中,我们提出了一种新颖的细粒度宽度感知动态电源门控(WADSG)方法,以减少数据路径和嵌入式存储器(例如L1/L2缓存)中的有源泄漏和冗余开关功率。该方法利用通用和嵌入式应用程序中大量的窄宽度(NW)操作数,在整数执行单元和内存块正在使用时“供应门”未使用的部分。我们引入了一种新的平化门控策略来消除唤醒延迟开销。我们将所提出的WADSG方法应用于一个超大标量处理器。为了减少唤醒功率,我们使用了宽度感知指令发布策略。在L1和L2缓存的情况下,我们根据关联缓存的“方式”存储宽度信息,并提供NW方式的最高有效位。我们还提出了一个宽度感知的块分配和替换策略,以最大限度地增加NW方式的数量。采用Spec2k基准测试的45nm技术的仿真结果显示,在没有性能影响的情况下,总处理器功耗(考虑开关和有源泄漏功率)大幅节省(34.5%)。作为副产品,该方案还改善了数据路径和存储器的热分布。
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引用次数: 2
Embedded Tutorial ET4: Advanced Techniques for Programming Networked Embedded Systems 嵌入式教程ET4:网络嵌入式系统编程的高级技术
Pub Date : 2012-01-07 DOI: 10.1109/VLSID.2012.39
V. Raghunathan
Cyber-Physical Systems (CPSs) are poised to play a pivotal role in engineering new solutions to a variety of societal-scale problems, such as energy conservation, climate change, healthcare, transportation, etc. Their importance is reflected in the overall theme for VLSI Design 2012, which is "Embedded Solutions for Emerging Markets Infrastructure, Energy, and Automotive." Networked embedded systems, such as wireless sensor networks, form a crucial building block for realizing large scale CPSs and have, therefore, received considerable research attention over the past few years. While this has resulted in numerous technological advances (e.g., a plethora of tiny, cheap, and low-power sensor platforms is now available), the problem of programming a distributed wireless sensor network still remains a major challenge and a potential show stopper to widespread adoption.
信息物理系统(cps)将在工程解决各种社会规模问题方面发挥关键作用,如节能、气候变化、医疗保健、交通等。它们的重要性反映在2012年VLSI设计的总体主题中,即“新兴市场基础设施、能源和汽车的嵌入式解决方案”。网络嵌入式系统,如无线传感器网络,是实现大规模cps的关键组成部分,因此在过去几年中受到了相当大的研究关注。虽然这导致了许多技术进步(例如,现在有大量微小、廉价和低功耗的传感器平台),但分布式无线传感器网络的编程问题仍然是一个主要挑战,也是广泛采用的潜在阻碍。
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引用次数: 0
期刊
2012 25th International Conference on VLSI Design
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