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    • 9. 发明授权
    • Method for reducing design effect of wearout mechanisms on signal skew in integrated circuit design
    • 降低集成电路设计中信号偏移的设计效应的方法
    • US06651230B2
    • 2003-11-18
    • US09683276
    • 2001-12-07
    • John Maxwell CohnJose Luis Pontes Correia NevesPaul Steven Zuchowski
    • John Maxwell CohnJose Luis Pontes Correia NevesPaul Steven Zuchowski
    • G06F1750
    • G06F17/505G06F1/10
    • A method for reducing the effect of signal skew degradation in the design of an integrated circuit is provided. First, a circuit design library is created describing library cells as a function of one or more environmental variable, wherein the one or more environmental variable includes a skew degradation variable indicating skew degradation of a signal as a function of a total number of signal switches of the signal. Then, the integrated circuit design is modeled utilizing the circuit design library to determine a first skew degradation for each of the first and second signals at a first predetermined number of signal switches, and a second skew degradation for each of the first and second signals for a second predetermined number of signal switches, and further to determine a first relative skew degradation for a first predetermined number of signal switches and a second relative skew degradation for a second predetermined number of signal switches, wherein a relative skew degradation is equal to the difference of the skew degradation of the first signal and the skew degradation of the second signal for a given number of signal switches. Next, a skew shift equal to the difference between the first relative skew degradation and the second relative skew degradation is calculated. Finally, the integrated circuit design is modified such that a skew degradation of the first signal at the first predetermined number of signal switches is determined to be equal to the first skew degradation of the first signal minus half of the skew shift.
    • 提供了一种降低集成电路设计中的信号偏差劣化的方法。 首先,创建描述作为一个或多个环境变量的函数的库单元的电路设计库,其中所述一个或多个环境变量包括歪斜劣化变量,其指示作为信号开关总数的函数的信号的歪斜退化 信号。 然后,使用电路设计库对集成电路设计进行建模,以在第一预定数量的信号开关处确定第一和第二信号中的每一个的第一偏斜劣化,以及用于第一和第二信号中的每一个的第二偏斜劣化 第二预定数量的信号开关,并且还用于确定第一预定数量的信号开关的第一相对偏斜劣化和第二预定数量的信号开关的第二相对偏斜劣化,其中相对偏斜劣化等于差 对于给定数量的信号开关,第一信号的偏斜劣化和第二信号的偏斜劣化。 接下来,计算等于第一相对偏斜劣化和第二相对偏斜劣化之间的差的偏移偏移。 最后,对集成电路设计进行修改,使得第一预定数量的信号开关处的第一信号的偏斜劣化被确定为等于第一信号的第一偏斜劣化减去偏移偏移的一半。