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    • 4. 发明授权
    • Method to identify unit pins that are not optimally positioned in a hierarchically designed VLSI chip
    • 识别不是最佳定位在分层设计的VLSI芯片中的单元引脚的方法
    • US06374394B1
    • 2002-04-16
    • US09422290
    • 1999-10-21
    • Peter J. CamporeseAllan H. DanskyHoward H. Smith
    • Peter J. CamporeseAllan H. DanskyHoward H. Smith
    • G06F1750
    • G06F17/5072
    • A method for identifying unit pin positions initially assigned in a hierarchical VLSI design that, if implemented, would increase the net length of the net of which the unit pins are a part. To identify unit pins, where the unit pin position assigned by the unit designer turns out to be a poor choice of position when the unit is integrated into the top level design, a “flat” file is created of the completed VLSI design with the units positioned on the chip, including their pin placements as assigned by the unit designers. The flat file includes not only top level unit data and unit-to-unit net data, but also macro data and macro net data integral to each unit design. The flat design data file is used to generate two pin logs; one pin log includes the incremental lengths of each net including the incremental lengths associated with the unit pins (if any) assigned by the designers of the units. The other pin log is the same, except it does not include the unit pins and the incremental net length associated with the unit pins. A commercially available program, for example, a Minimum Spanning Tree (MST) program or a Steiner Minimal Tree program is run against every net; once against the nets in the pin log list that includes the pins assigned by the designers of the units, and once against the nets in the pin log list that does not include assigned unit pins. The output of interest of the MST (or similar program) run against the net files with and without pin assignments is a text file containing the net names, number of pins per net with and without unit pins and the difference between the net lengths with and without unit pin assignments. If the difference exceeds a threshold value, that net is identified so that the unit pins can be reassigned by the unit designer or designers.
    • 一种用于识别最初在分层VLSI设计中分配的单元销位置的方法,如果被实现,将增加单元引脚作为一部分的网的净长度。 为了识别单元引脚,当单元集成到顶级设计中时,由单元设计人员分配的单元销位置变为不良位置的选择,将创建具有单元的完成的VLSI设计的“平面”文件 位于芯片上,包括由单元设计师分配的针位置。 平面文件不仅包括顶层单元数据和单元到单元净数据,而且还包括每个单元设计的宏数据和宏网数据。 平面设计数据文件用于生成两个引脚日志; 一个针脚日志包括每个网络的增量长度,包括与单元设计者分配的单位引脚(如果有的话)相关联的增量长度。 另一个引脚日志是相同的,除了它不包括单位引脚和与单元引脚相关联的增量净长度。 针对每个网络运行市售程序,例如最小生成树(MST)或Steiner最小树程序; 一次针对引脚日志列表中的网络,其中包括由单元的设计者分配的引脚,并且一次针对不包括分配的单元引脚的引脚日志列表中的网络。 MST(或类似程序)对带有和不带引脚分配的网络文件的兴趣的输出是一个文本文件,其中包含网络名称,每个带有和不带有单元引脚的网络引脚数,以及与/ 没有单位引脚分配。 如果差异超过阈值,则识别该网络,使得单元引脚可由单元设计者或设计者重新分配。
    • 5. 发明授权
    • Method and system for electromigration analysis on signal wiring
    • 信号线路电迁移分析方法与系统
    • US07971171B2
    • 2011-06-28
    • US12123769
    • 2008-05-20
    • Joachim KeinertHoward H. SmithPatrick M. Williams
    • Joachim KeinertHoward H. SmithPatrick M. Williams
    • G06F17/50
    • G06F17/5036
    • The invention relates to an electromigration analysis method and a system for analyzing one or more nets in a digital integrated circuit design that are at risk of electromigration. The method comprises the steps of providing at least one interconnect between a driver cell and at least one load cell; applying same extracted netlist data for noise and/or timing analysis and for electromigration analysis; modeling the driver cell by a train of trapezoidal voltage pulses transmitted from the driver cell to the one or more load cells through the at least one interconnect; extracting at least a slew rate of a driver voltage signal and/or timing information from a noise and/or timing analysis for the one or more nets; and comparing a locally measured current density in the at least one interconnect to an effective local maximum current density limit of the at least one interconnect.
    • 本发明涉及电迁移分析方法和用于分析处于电迁移风险的数字集成电路设计中的一个或多个网络的系统。 该方法包括以下步骤:在驱动器单元和至少一个称重传感器之间提供至少一个互连; 应用相同的提取网表数据进行噪声和/或定时分析和电迁移分析; 通过所述至少一个互连通过从所述驱动器单元传输到所述一个或多个称重传感器的一串梯形电压脉冲对所述驱动器单元进行建模; 从所述一个或多个网络的噪声和/或定时分析中提取至少一个驱动器电压信号和/或定时信息的转换速率; 以及将所述至少一个互连中的局部测量的电流密度与所述至少一个互连的有效局部最大电流密度极限进行比较。
    • 7. 发明申请
    • Method and System for Electromigration Analysis on Signal Wiring
    • 信号接线电迁移分析方法与系统
    • US20090013290A1
    • 2009-01-08
    • US12123769
    • 2008-05-20
    • Joachim KeinertHoward H. SmithPatrick M. Williams
    • Joachim KeinertHoward H. SmithPatrick M. Williams
    • G06F17/50
    • G06F17/5036
    • The invention relates to an electromigration analysis method and a system for analyzing one or more nets in a digital integrated circuit design that are at risk of electromigration. The method comprises the steps of providing at least one interconnect between a driver cell and at least one load cell; applying same extracted netlist data for noise and/or timing analysis and for electromigration analysis; modeling the driver cell by a train of trapezoidal voltage pulses transmitted from the driver cell to the one or more load cells through the at least one interconnect; extracting at least a slew rate of a driver voltage signal (UD) and/or timing information from a noise and/or timing analysis for the one or more nets; and comparing a locally measured current density (if,rms,R32) in the at least one interconnect to an effective local maximum current density limit (irms,max) of the at least one interconnect.
    • 本发明涉及电迁移分析方法和用于分析处于电迁移风险的数字集成电路设计中的一个或多个网络的系统。 该方法包括以下步骤:在驱动器单元和至少一个称重传感器之间提供至少一个互连; 应用相同的提取网表数据进行噪声和/或定时分析和电迁移分析; 通过所述至少一个互连通过从所述驱动器单元传输到所述一个或多个称重传感器的一串梯形电压脉冲对所述驱动器单元进行建模; 从所述一个或多个网络的噪声和/或定时分析中提取至少一个驱动器电压信号(UD)的转换速率和/或定时信息; 以及将所述至少一个互连中的局部测量的电流密度(if,rms,R32)与所述至少一个互连的有效局部最大电流密度极限(irms,max)进行比较。