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    • 2. 发明授权
    • Automated clock alignment for testing processors in a bypass mode
    • 以旁路模式测试处理器的自动时钟对齐
    • US06704892B1
    • 2004-03-09
    • US09583268
    • 2000-05-31
    • Nasser A. KurdJaved S. BarkatullahTim FrodshamDavid J. O'Brien
    • Nasser A. KurdJaved S. BarkatullahTim FrodshamDavid J. O'Brien
    • G01R3128
    • G06F11/27G01R31/31725G01R31/318594
    • In a bypass mode, a tester may bypass the core and input/output phase locked loops (PLLs) utilized by a processor to develop internal clock signals. External, tester-generated, phase shifted clock signals may be used to generate aligned high frequency signals to replace those generated by the phase locked loops. A plurality of phase shifted, tester generated clock signals may be subjected to an exclusive OR operation for generating input/output and core clock replacement signals. The clock signals received from the tester may also be aligned. Thus, a variety of skews may be compensated before entering the bypass mode. In some embodiments of the present invention, the core and I/O PLL clocks are used to establish alignment in a set-up phase and in other embodiments, the core and I/O PLL need not be utilized at all to generate appropriate internal clock signals from an external tester.
    • 在旁路模式下,测试人员可以绕过核心和处理器利用的输入/输出锁相环(PLL)来开发内部时钟信号。 外部测试仪生成的相移时钟信号可用于产生对准的高频信号以代替由锁相环生成的信号。 多个相移的测试仪产生的时钟信号可以经受用于产生输入/输出和核心时钟替换信号的异或运算。 从测试仪接收的时钟信号也可以对齐。 因此,在进入旁路模式之前可以补偿各种偏差。 在本发明的一些实施例中,核心和I / O PLL时钟用于在建立阶段建立对准,在其它实施例中,核心和I / O PLL根本不需要被利用以产生适当的内部时钟 来自外部测试仪的信号。
    • 3. 发明授权
    • Apparatus for I/O leakage self-test in an integrated circuit
    • 集成电路中用于I / O泄漏自检的装置
    • US06262585B1
    • 2001-07-17
    • US09332758
    • 1999-06-14
    • R. Tim FrodshamDavid J. O'Brien
    • R. Tim FrodshamDavid J. O'Brien
    • G01R3102
    • G01R31/3004G01R31/31715
    • According to one embodiment, an integrated circuit is disclosed that includes a first input/output (I/O) circuit and a leakage detection circuit coupled to the first I/O circuit. In a test mode of operation, the leakage detection circuit tests the first I/O circuit for excessive leakage current. According to another embodiment, the integrated circuit also includes a first resistor coupled between a line voltage and the first I/O circuit and a second resistor coupled between the first I/O circuit and ground. Further, the integrated circuit includes a second I/O circuit coupled to the leakage detection circuit and the first and second resistors. The leakage circuit also tests the second I/O circuit for excessive leakage current in the test mode of operation.
    • 根据一个实施例,公开了一种集成电路,其包括耦合到第一I / O电路的第一输入/输出(I / O)电路和泄漏检测电路。 在测试操作模式下,漏电检测电路对第一个I / O电路进行了测试,以获得过大的漏电流。 根据另一实施例,集成电路还包括耦合在线路电压和第一I / O电路之间的第一电阻器以及耦合在第一I / O电路和地之间的第二电阻器。 此外,集成电路包括耦合到泄漏检测电路和第一和第二电阻器的第二I / O电路。 泄漏电路还在测试操作模式下对第二个I / O电路进行过大的漏电流测试。