Selecting a scan topology
First Claim
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1. A method for selecting a controller comprised in a plurality of controllers connected in a scan topology in a target system, the method comprising:
- receiving a selection event and a selection sequence containing selection criteria from a signal line at each of the plurality of controllers, wherein the criteria for selection is broadcast to the plurality of controllers; and
placing a controller online when the received selection criteria matches an activation criteria of the controller.
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Abstract
A controller that shares an interface with several other controllers connected in a scan topology in a target system may be selected by receiving a selection event and a selection sequence containing selection criteria from a signal line at each of the controllers, wherein the criteria for selection is broadcast to the controllers. A controller is placed online when the received selection criteria matches an activation criteria of the controller.
10 Citations
23 Claims
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1. A method for selecting a controller comprised in a plurality of controllers connected in a scan topology in a target system, the method comprising:
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receiving a selection event and a selection sequence containing selection criteria from a signal line at each of the plurality of controllers, wherein the criteria for selection is broadcast to the plurality of controllers; and placing a controller online when the received selection criteria matches an activation criteria of the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for selecting a controller comprised in a plurality of controllers connected in a scan topology in a target system, the method comprising:
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receiving a control event comprising a sequence on a signal line while a second signal is held at a specified logic level; receiving selection criteria when the control event is a select event; and entering an online state when the received selection criteria matches selection criteria required by the controller.
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17. The method of 16, further comprising receiving a qualification sequence to allow initiation of the control event.
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18. The method of 17, further comprising receiving a bit sequence initiating the control event.
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19. A digital system, comprising:
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at least one functional component with a controller, the controller comprising; a clock signal and a control signal that may be configured to receive test or debug information from a system under test; a serial path having one or more bits, the serial path configurable to connect to a data input signal and to a data output signal in a first mode and to the control signal in a second mode; controller selection criteria, and control logic coupled to the controller selection criteria, the control logic configured to detect a selection event and selection criteria received on the control signal. - View Dependent Claims (20, 21, 22, 23)
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Specification