721 resultados para Fpga


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半导体芯片的生产制造过程并不是完美无缺的,所有的芯片需要进行针对制造缺陷的测试。随着FPGA芯片规模越来越大,结构越来越复杂,产品测试也越来越困难。在FPGA测试所面临的主要问题是:对CLB、互连资源、IO资源等结构进行数学建模、测试配置算法和测试向量的开发、测试结构的选择、测试平台的搭建等。 本文主要工作及创新点如下: 根据FPGA的可配置逻辑单元的不同组成结构,给出了针对常规逻辑资源给出了8个测试配置达到100%覆盖率,,并提出了基于故障模型的可配置逻辑资源的测试方法,并在硬件测试平台中进行验证,证明了方法的有效性; 根据FPGA互连资源的结构建立模型,并运用着色算法得到测试配置,达到100%的测试覆盖率,并提出了一种测试配置到器件配置的新的转换方法,该方法简单易行。搭建了基于ATE的测试平台,通过这个平台实现了FPGA芯片互连资源测试方法,测试效果良好。 通过XC4000系列FPGA可配置逻辑单元和互连资源测试的研究,我们总结了适合FPGA测试的一般方法,可以应用在任何类型的FPGA测试中。 提出了一种针对开关矩阵多路选择器的测试配置方法和测试向量。并将这种方法推广到芯片级测试配置,提出了一种基于BIST的测试结构。这是因为FPGA芯片的IO端口有限,用BIST结构可以节省IO资源。

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提出一种基于FPGA的可重构嵌入式微处理器控制系统.在FPGA中嵌入两个NiosⅡ软核,用VHDL语言编写用户自定义组件.在一个由NiosⅡ软核组成的处理器上实现PWM信号生成、编码器信号处理以及多电机同步伺服运算等,在另一个处理器实现机器人任务管理.该控制系统针对微小型爬壁机器人的控制系统设计,不仅具有良好的实时多任务处理能力,而且具有可重构的特点,因而可应用于一类微小型机器人控制系统以提高其设计的灵活性.

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在偏振耦合测试仪的PCI接口数据采集系统中,现场可编程门阵列(FieldProgramableGateArray)实现了对模/数器件的控制功能,同时完成了与PCI总线控制器间的数据接口功能。应用自顶向下的设计思想,完成了FPGA内部的逻辑设计,并对其逻辑功能进行了仿真验证,给出了FPGA数据采集时的测试时序图。应用FPGA实现的数据采集系统可以检测出偏振耦合检测仪中的微弱干涉光信号。

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在研究快速傅里叶变换(FFT)算法的基础上,根据FPGA性能高、灵活性强、速度快的特点,提出了高效的基4-FFT处理器的实现方法。数据存储采用分块存储的方法,大大提高了存取速度。数据寻址采用新型的地址产生方法,可并行产生所需数据地址。同时,在蝶形单元的设计中很好的将并行运算技术和流水线技术相结合了起来,又进一步提高了运算速度。测试结果表明,时钟在50MHz时完成1024点FFT的时间为25.6μs,满足了应用实时性的要求。

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本文研究的主要内容为基于DSP和FPGA的火腿肠质量检测系统设计。论文首先介绍了研究背景及意义和火腿肠质量检测系统原理,接着介绍了传统的专用和通用图像处理系统的结构、特点和模型,并通过分析DSP芯片以及DSP系统的特点,提出了基于DSP和FPGA芯片的实时图像处理系统。该系统不同于传统基于PC机模式的图像处理系统,发挥了DSP和FPGA两者的优势,能更好地提高图像处理系统实时性能。 其次,论述了以TMS320C6416 DSP为核心处理器实时图像处理系统的设计原理与组成,对系统主要部分的电路设计进行了详细的介绍,研究分析了高速电路设计中的几个关键问题。对系统进行了软件开发与调试,包括DSP程序设计和FPGA模块设计,并给出了FPGA各个模块仿真调试结果。经系统调试与实验验证,系统工作稳定可靠,拥有很高的实时性。 最后, 在火腿肠质量检测的图像算法中,对火腿肠的鼓泡问题进行了分析和相关算法的设计。首先实现了FPGA的图像预处理,将流水线处理技术和并行处理等技术应用到电路设计中,提高了处理速度,节省了硬件开销。在DSP中采用了多种算法对火腿肠图像进行了进一步的处理,使其特征更为明显。结果表明,实现的硬件电路能够满足系统功能和处理时间要求,同时有比较高的识别率,具有一定的参考价值。

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This paper presents a multi-language framework to FPGA hardware development which aims to satisfy the dual requirement of high-level hardware design and efficient hardware implementation. The central idea of this framework is the integration of different hardware languages in a way that harnesses the best features of each language. This is illustrated in this paper by the integration of two hardware languages in the form of HIDE: a structured hardware language which provides more abstract and elegant hardware descriptions and compositions than are possible in traditional hardware description languages such as VHDL or Verilog, and Handel-C: an ANSI C-like hardware language which allows software and hardware engineers alike to target FPGAs from high-level algorithmic descriptions. On the one hand, HIDE has proven to be very successful in the description and generation of highly optimised parameterisable FPGA circuits from geometric descriptions. On the other hand, Handel-C has also proven to be very successful in the rapid design and prototyping of FPGA circuits from algorithmic application descriptions. The proposed integrated framework hence harnesses HIDE for the generation of highly optimised circuits for regular parts of algorithms, while Handel-C is used as a top-level design language from which HIDE functionality is dynamically invoked. The overall message of this paper posits that there need not be an exclusive choice between different hardware design flows. Rather, an integrated framework where different design flows can seamlessly interoperate should be adopted. Although the idea might seem simple prima facie, it could have serious implications on the design of future generations of hardware languages.

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This paper, chosen as a best paper from the 2004 SAMOS Workshop on Computer Systems: describes a novel, efficient methodology for automatically creating embedded DSP computer systems. The novelty arises since now embedded electronic signal processing systems, such as radar or sonar, can be designed by anyone from the algorithm level, i.e. no low level system design experience is required, whilst still achieving low controllable implementation overheads and high real time performance. In the chosen design example, a bank of Normalised Lattice Filter (NLF) components is created which a four-fold reduction in the required processing resource with no performance decrease.

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This paper, chosen as a best paper from the 2005 SAMOS Workshop on Computer Systems: describes the for the first time the major Abhainn project for automated system level design of embedded signal processing systems. In particular, this describes four key novelties: novel algorithm modelling techniques for DSP systems, automated implementation realisation, algorithm transformation for system optimisation and automated inter-processor communication. This is applied to two complex systems: a radar and sonar system. In both cases technology which allows non-experts to automatically create low-overhead, high performance embedded signal processing systems is exhibited.