共查询到17条相似文献,搜索用时 250 毫秒
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本文首先讨论了逻辑函数的分解;然后给出利用多路选择器实现多变量组合函数时,获得最小或接近最小的树形结构网络的设计方法。该方法适用于计算机自动综合。 相似文献
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本文提出了一种适于数据通路应用的快速可编程逻辑单元 .该单元采用功能增强的MUX结构 ,在配置为异或 同或 多路选择器 (XOR XNOR MUX)结构时 ,只用一个单元的开销就可实现一位全加器、基本乘法单元等适于数据通路应用的功能 .该单元还能实现全部 3输入逻辑和部分 4~ 7输入逻辑 ,也是一种满足通用逻辑应用的结构 .这种单元的组合逻辑部分只采用了 3个 2选 1多路选择器 (2 :1MUX)和两个功能增强的输入可反相编程的多路选择器(2 :1EMUX) ,有效地节省面积和提高了速度 .HSPICE模拟分析表明 ,在 5V、0 6 μm工艺条件下 ,该单元的最大时延小于0 6ns,进位时延小于 0 1ns.其性能、速度和面积优势非常明显 相似文献
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多路选择器是一种对从工业现场采集来的多路模拟信号进行选择的重要器件,也称多路开关。本文旨在用数片模拟多路选择集成电路(如CD4097、CD4067)及微处理器ADuC834等器件设计出一种多路选择器。它能在20路模拟信号传送过程中,根据需要将其中任意一路选择出来供给模数转换器转换,从而大幅度的提高相关硬件资源的使用效率,节约硬件成本。 相似文献
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为了探索多输入时序逻辑电路的简便实现方法,介绍了基于数据选择器和D触发器的多输入时序逻辑电路设计技术。即将D触发器和数据选择器进行组合,用触发器的现态作为数据选择器选择输入变量、数据选择器的输出函数作为触发器的D输入信号,构成既有存储功能又有数据选择功能的多输入端时序网络。由触发器的现态选择输入变量、所选择的输入变量决定触发器的次态转换方向。该方法适合实现互斥多变量时序逻辑电路,且在设计过程中不需要进行函数化简。 相似文献
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本文提出了一种适于数据通路应用的快速可编辑逻辑单元。该单元采用功能增强的MUX结构,在配置为异或-同或-多路选择器(XOR-XNOR-MUX)结果时,只用一个单元的开销就可实现一位全加器、基本乘法单元等适于数据通路应用的功能。该单元还能实现全部3输入逻辑和部分4~7输入逻辑,也是一种满足通用逻辑应用的结构。这种单元的组合逻辑部分只采用了3个2选1多路选择器(2:1MUX)和两个功能增强的输入可反相编辑的多路选择器(2:1 EMUX),有效地节省面积和提高了速度。HSPICE模拟分析表明,在5V、0.6um工艺条件下,该单元的最大时延小于0.6ms,进位时延小于0.1ns,其性能、速度和面积优势非常明显。 相似文献
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组合逻辑电路传统设计方法是采用门电路组成设计形式,设计时所需门电路器件多,电路相对复杂,应用价值差。运用数据选择器设计组合逻辑电路方法,可以实现任何不同组合逻辑函数,从而实现组合电路设计,适应范围广,并且其设计电路简洁,接线方便,工作可靠性、稳定性高。因此利用数据选择器设计组合逻辑电路具有一定的应用价值,能解决常规门电路设计存在不足,提高电路设计水平。 相似文献
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用集成数据选择器可以实现任意组合逻辑函数,实现的方法有代数法和卡诺图法,当逻辑函数变量数较多时,代数法求解过程繁琐,而卡诺图法求解过程较简单。本文给出了用卡诺图法实现任意组合逻辑函数(含约束项和不含约束项两种情况)的方法,教学实践证明,这方法学生容易接受和理解,有较好的教学效果。 相似文献
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数字逻辑化简是数字系统中的一个重要问题,经典方法采用布尔代数式和卡诺图化简,现代虽可采用计算机辅助逻辑综合,但在一般数字设备中,手工的卡诺图化简仍不失为有效手段,可是它在多变量(大于5、6变量)的情况下,便难于处理,为此,如何充分发挥现有中规模器件集成度较高的优点,扩展其逻辑功能,以便用于常用数字系统中组合逻辑及时序逻辑网络综合。多路选择器在处理这类问题上,有其特有的优点,本文拟就多路选择器扩展应用于多输入逻辑设计作一简要介绍。 相似文献
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本文发现并以定理的形式证明了具有异号权重模板的细胞神经网络系统在非均匀增益分段性输函数下的细 化稳态性性。 相似文献
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Robert Drinkwater 《Microelectronics Reliability》1983,23(3):415-419
The paper describes a mathematical model for use in the initial planning of communication networks involving a number of terminals connected through multiplexers to a central computer. The model makes use of the two-thirds power relationship between multiplexer and terminal density to minimise cable distance to assess the total network cost including that caused by loss of availability.The total cost is given for both a star and a multiplexer network with and without the use of standby lines and the number of multiplexers is derived which minimises the total network cost.Included in the model is a method of assessing the total cost of a multiplexer network when the terminal density varies discretely throughout the computer service area.Finally, as an example of the model's application we derive the total cost of the different networks for the special case when the terminal density varies continuously throughout. 相似文献
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The design of a constant resistance multiplexer composed of three reactance ladder networks connected either in series or in parallel is a very practical problem. In this paper, an improvement on Norton's method and a set of necessary and sufficient conditions on the realizability of a Butterworth or elliptic constant resistance multiplexer are presented. Two illustrative examples are given to show the design procedure. 相似文献
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The next generation of logic gate devices are expected to depend upon radically new technologies mainly due to the increasing difficulties and limitations of existing CMOS technology. MOSFET like CNFETs should ideally be the best devices to work with for high-performance VLSI. This paper presents results of a comprehensive comparative study of MOSFET-like carbon nanotube field effect transistors (CNFETs) technology based logic gate library for high-speed, low-power operation than conventional bulk CMOS libraries. It focuses on comparing four promising logic families namely: complementary-CMOS (C-CMOS), transmission gate (TG), complementary pass logic (CPL) and Domino logic (DL) styles are presented. Based on these logic styles, the proposed library of static and dynamic NAND-NOR logic gates, XOR, multiplexer and full adder functions are implemented efficiently and carefully analyzed with a test bench to measure propagation delay and power dissipation as a function of supply voltage. This analysis provides the right choice of logic style for low-power, high-speed applications. Proposed logic gates libraries are simulated using Synopsys HSPICE based on the standard 32 nm CNFET model. The simulation results demonstrate that, it is best to use C-CMOS logic style gates that are implemented in CNFET technology which are superior in performance compared to other logic styles, because of their low average power-delay-product (PDP). The analysis also demonstrates how the optimum supply voltage varies with logic styles in ultra-low power systems. The robustness of the proposed logic gate library is also compared with conventional and state-art of CMOS logic gate libraries. 相似文献