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    • 6. 发明申请
    • DUTY CYCLE BASED TIMING MARGINING FOR I/O AC TIMING
    • 用于I / O交流时序的基于周期的时序计时
    • US20150377967A1
    • 2015-12-31
    • US14319528
    • 2014-06-30
    • BHARANI THIRUVENGADAMCHRISTOPHER NELSON
    • BHARANI THIRUVENGADAMCHRISTOPHER NELSON
    • G01R31/317G01R31/3177
    • G01R31/31715G01R31/3171
    • Testing I/O (input/output) eye width for an interface with an inverted modulated strobe or clock signal. An I/O interface includes multiple signal lines, each with a hardware I/O buffer with timing characteristics. A system generates a strobe signal with a triggering edge that triggers a write, and a trailing edge that is modulated by adjusting the duty cycle of the strobe signal. The system inverts the modulated strobe signal to generate an inverted strobe signal, wherein the inverted strobe signal has a modulated triggering edge generated from inverting the modulated trailing edge. The device under test writes test data based on the triggering edge of the original strobe signal and reads test data based on the triggering edge of the inverted strobe signal.
    • 测试具有反相调制选通脉冲或时钟信号的接口的I / O(输入/输出)眼宽。 I / O接口包括多条信号线,每条信号线都带有具有定时特性的硬件I / O缓冲器。 系统产生具有触发写入的触发边缘的选通信号,以及通过调整选通信号的占空比来调制的后沿。 系统将调制的选通信号反相以产生反相选通信号,其中反相选通信号具有从调制的后沿反相产生的调制触发沿。 被测器件根据原始选通信号的触发边沿写入测试数据,并根据反相选通信号的触发沿读取测试数据。