Distributed tap controller

Details Distributed tap controller Distributed tap controller

2007-06-12

2007-06-12

Le, Dieu-Minh (Department: 2114)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S724000

Reexamination Certificate

active

09894831

ABSTRACT:
A system accessible by a test access port controller via a test access port interface includes a data register. The data register is selectable based on an instruction register signal in the test access port interface. The instruction register signal is derived form an instruction register in the test access port controller. A shift register is connected to a data input and a data output in the test access port interface and to the data register. The operation of the shift register is controlled based on an indication of a state of a test access port controller state machine that is received over the test access port interface.

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