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    • 2. 发明申请
    • DYNAMICALLY SELF-RECONFIGURABLE DAISY-CHAIN OF TAP CONTROLLERS
    • 动态控制器的自动重新配置的DAISY链
    • WO2013048578A1
    • 2013-04-04
    • PCT/US2012/037139
    • 2012-05-09
    • QUALCOMM INCORPORATEDYANG, Chang YongMUMFORD, Clint W.TAO, YucongBORDEN, Craig E.
    • YANG, Chang YongMUMFORD, Clint W.TAO, YucongBORDEN, Craig E.
    • G06F11/267G01R31/3185
    • G01R31/318555
    • A self-reconfigurable daisy-chain of TAP controllers includes a main TAP controller and one or more auxiliary TAP controllers. The daisy-chain is dynamically self-reconfigurable in that the main TAP controller can configure and reconfigure the daisy-chain multiple times during the testing of a circuit. A data register within the main TAP controller is associated with a special JTAG instruction. This instruction is usable to enable and disable selected individual ones of the auxiliary TAP controllers. If an auxiliary controller is enabled, then it is made a part of the TDI-to-TDO daisy-chain scan path. If the auxiliary controller is disabled, then it is not a part of the daisy-chain scan path. A disabled controller and its registers are not, however, reset. A disabled controller can continue to supply test signals to the circuit under test. Using this mechanism, test time can be reduced by reducing the amount of shifting through slow controllers.
    • TAP控制器的自重构菊花链包括主TAP控制器和一个或多个辅助TAP控制器。 菊花链是动态自重新配置的,因为主TAP控制器可以在电路测试期间多次配置和重新配置菊花链。 主TAP控制器内的数据寄存器与特殊的JTAG指令相关联。 该指令可用于启用和禁用辅助TAP控制器中选定的各个。 如果辅助控制器被使能,那么它就成为TDI到TDO菊花链扫描路径的一部分。 如果辅助控制器被禁用,那么它不是菊花链扫描路径的一部分。 然而,禁用的控制器及其寄存器不会被重置。 禁用的控制器可以继续向被测电路提供测试信号。 使用这种机制,可以通过减少通过慢速控制器的移动量来减少测试时间。