Method for testing an electronic circuit
First Claim
Patent Images
1. A method of testing an electronic circuit, which comprises:
- initializing a number of circuit components;
simultaneously activating essentially only those circuit components on a test basis of which interaction is expected in a given context; and
reading out an actual state of the circuit components to be tested, and comparing the actual state of the circuit components with a setpoint state.
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Abstract
A method for testing an electronic circuit is described, in which the actual state of circuit components which have previously been activated on a test basis after an initial initialization is compared with a setpoint state. Of the circuit components to be tested, essentially only those circuit components are operated simultaneously which, under the given circumstances, can be expected to interact in the context.
57 Citations
12 Claims
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1. A method of testing an electronic circuit, which comprises:
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initializing a number of circuit components;
simultaneously activating essentially only those circuit components on a test basis of which interaction is expected in a given context; and
reading out an actual state of the circuit components to be tested, and comparing the actual state of the circuit components with a setpoint state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of testing an electronic circuit, which comprises:
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initializing a number of circuit components;
in the initialization step, placing a circuit to be tested in a scan mode of operation in which elements whose state is to be initialized and read out are connected one behind the other to form one or more scan chains;
assigning elements to various scan chains and defining a sequence within a given scan chain such that clock signals with which the scan chain elements are clocked reach the scan chain elements during the activating step no later than at a time at which signals are to be one of received and transmitted by the respective scan chain element;
simultaneously activating essentially only those circuit components on a test basis of which interaction is expected in a given context; and
reading out an actual state of the circuit components to be tested, and comparing the actual state of the circuit components with a setpoint state.
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11. A method of testing an electronic circuit, which comprises:
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initializing a number of circuit components;
simultaneously activating essentially only those circuit components on a test basis of which interaction is expected in a given context;
reading out an actual state of the circuit components to be tested, and comparing the actual state of the circuit components with a setpoint state; and
supplying no clock signals to those parts of the circuit which, at the time, are not to be initialized, activated on a test basis, or read out.
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12. A method of testing an electronic circuit, which comprises:
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initializing a number of circuit components;
simultaneously activating essentially only those circuit components on a test basis of which interaction is expected in a given context;
reading out an actual state of the circuit components to be tested, and comparing the actual state of the circuit components with a setpoint state; and
assigning registers to given circuit components, and making an application of a normal clock signal, a test clock signal, or no clock signal to said given circuit components dependent on contents of the given registers assigned to the circuit components and on a status of a mode-of-operation-selection signal.
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Specification