Method and arrangement for controlling multiple te

专利名称：Method and arrangement for controlling

multiple test access port control modules

发明人：Swaroop Adusumilli,James Steele,David

Cassetti

申请号：US09283809申请日：19990401公开号：US06385749B1公开日：20020507

专利附图：

摘要：An arrangement controls an IC designed with multiple “core” circuits, such asmultiple CPUs, with each core circuit including its own TAP controller. According to one

example embodiment, multiple test-access port (TAP) controllers coupled to a commoninterface are controlled by adapting each TAP controller to receive input signals,determine if the TAP controller is enabled, and generate status signals and test signals.An output circuit responds to the TAP controllers by outputting one of the test signalsrespectively provided by the multiple TAP controllers, and a link module is used tomaintain one of the TAP controllers enabled at a given time. The above-embodiment isuseful, for example, in connection with IC applications that require an increasing numberof core circuits without increasing the circuit area of the IC and/or the number of IC pins,and can be implemented to avoid changing existing structures of TAP controllers.

申请人：KONINKLIJKE PHILIPS ELECTRONICS N.V. (KPENV)

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