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热词
    • 2. 发明授权
    • Testable electronic circuit
    • 可测电子线路
    • US07899641B2
    • 2011-03-01
    • US11815313
    • 2006-01-31
    • Hervé FleuryJean-Marc Yannou
    • Hervé FleuryJean-Marc Yannou
    • G01R31/00
    • G01R31/318552G01R31/31727
    • An electronic circuit contains groups of flip-flops (12a-c), coupled to data terminals (11a-c) of the circuit and to a functional circuit (10). Each group (12a-c) has a clock input for clocking the flip-flops of the group. Each group (12a-c) can be switched between a shift configuration and a functional configuration, for serially shifting in test data from the data terminals and to function in parallel to supply signals to the functional circuit (10) and/or receive signals from the functional circuit (10) respectively. A test control circuit (16) can be switched between a functional mode, a test shift mode and a test normal mode. The test control circuit (16) is coupled to the groups of flip-flops (12a-c) to switch the groups to the functional configuration in the functional mode and to the shift configuration in the test shift mode. A clock multiplexing circuit (15a-c, 18) has inputs coupled to the data terminals (11a-c) and outputs coupled to clock inputs of the groups (12a-c). The test control circuit (16) is coupled to control the clock multiplexing circuit (15a-c, 18) dependent on the mode assumed by the test control circuit (16). The clock multiplexing circuit (15a-c, 18) is arranged to substitute clock signals from respective ones of the data terminals (11a-c) temporarily at the clock inputs of respective ones of the groups (12a-c) in the test normal mode.
    • 电子电路包括耦合到电路的数据端子(11a-c)和功能电路(10)的触发器组(12a-c)。 每组(12a-c)都有一个时钟输入,用于对该组的触发器进行计时。 每个组(12a-c)可以在移位配置和功能配置之间切换,用于从数据终端串行地移动测试数据,并且并行地向功能电路(10)提供信号和/或从功能电路 功能电路(10)。 测试控制电路(16)可以在功能模式,测试移位模式和测试正常模式之间切换。 测试控制电路(16)耦合到触发器组(12a-c),以将功能模式中的功能配置和测试移位模式中的移位配置切换到功能模式。 时钟多路复用电路(15a-c,18)具有耦合到数据终端(11a-c)的输入和耦合到组(12a-c)的时钟输入的输出。 测试控制电路(16)被耦合以根据由测试控制电路(16)假设的模式来控制时钟复用电路(15a-c,18)。 时钟多路复用电路(15a-c,18)被配置为在测试正常模式下,在各个组(12a-c)的时钟输入端临时替代来自数据终端(11a-c)中的相应数据终端的时钟信号 。