Resources Contact Us Home
Restricting the damaging effects of software faults on test and configuration circuitry

Image Number 4 for United States Patent #6578166.

A system that restricts the damaging effects of software faults that interact with test and configuration circuitry. This test and configuration circuitry includes a scan chain in the form of a serial linkage between memory elements within a circuit, thereby allowing a test input to be serially shifted into the memory elements. The system operates by receiving a test disable signal at the circuit. In response to the test disable signal, the system moves the circuit into a test disable mode, which limits any damaging effects to the circuit caused by shifting the test input into the memory elements in the scan chain. Next, the system shifts the test input into the memory elements in the scan chain. T he system also determines whether the test input will cause damage to the circuit after the test input is completely shifted into the scan chain. If so, the system holds the circuit in the test disable mode so that the test input cannot damage the circuit. If not, the system moves the circuit out of test disable mode, and runs the circuit for at least one clock cycle in order to test the circuit.

  Recently Added Patents
Encoding method, decoding method, encoding device, decoding device, program, and recording medium
Circuit for compressing data and a processor employing same
Intralevel conductive light shield
Elastic polypropylene-based film compositions
Method and apparatus for eliminating a motor vehicle tip-over risk
Positive electrode active material for nonaqueous electrolyte secondary battery
Method and apparatus for blind signal extraction
  Randomly Featured Patents
Machine tool housing
Negative working imageable composition containing sulfonic acid
Dual fuel mixer for gas turbine combustor
Flow velocity and pressure measurement using a vibrating cantilever device
4-(5- And 7-)benzoylindolin-2-ones and pharmaceutical uses thereof
System for preventing unauthorized operation of an automotive vehicle
Method of erasing a flash memory
Wireless mesh network channel selection
Abradable coating system
Conveyor incorporating curved surface flight links