Apparatus and method for coupling a plurality of test access ports to external test and debug facility
First Claim
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1. An interface unit for selectively testing a plurality of processor/cores, the interface unit comprising:
- an interface test access port (TAP) unit operable to receive test commands; and
a logic unit coupled to the interface TAP for allowing the selection of multiple TAPs into one scan path and operable to generate control signals based on the received test commands to selectively generate a configuration of TAP units comprised in the plurality of processor/cores to receive test signals.
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Abstract
An interface unit is provided for selectively testing a plurality of processor/cores. The interface unit includes an interface test access port (TAP) unit operable to receive test commands, and a logic unit coupled to the interface TAP unit and operable to generate control signals based on the received test commands to selectively generate a configuration of TAP units comprised in the plurality of processor/cores to receive test signals.
27 Citations
20 Claims
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1. An interface unit for selectively testing a plurality of processor/cores, the interface unit comprising:
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an interface test access port (TAP) unit operable to receive test commands; and a logic unit coupled to the interface TAP for allowing the selection of multiple TAPs into one scan path and operable to generate control signals based on the received test commands to selectively generate a configuration of TAP units comprised in the plurality of processor/cores to receive test signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for selectively testing a plurality of processor/cores, each processor/core comprising a TAP unit, the method comprising:
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receiving a test command designating selected processor/cores of the plurality of processor/cores in an interface TAP unit comprised in an interface unit, the interface unit coupled to the TAP units of the processor/cores for allowing the selection of multiple TAPs into one scan path; generating control signals by the interface unit responsive to the test command; and applying the control signals to generate a configuration of the TAP units of the selected processor/cores to receive test signals. - View Dependent Claims (10, 11, 12, 13)
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14. A system for selectively testing a plurality of processor/cores, the system comprising:
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a plurality of processor/cores, each processor/core comprising a TAP unit; and an interface unit coupled to the TAP units for allowing the selection of multiple TAPs into one scan path, the interface unit comprising an interface TAP unit operable to receive test commands and a logic unit operable to generate control signals based on the received test commands to selectively generate a configuration of the TAP units to receive test signals. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification