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
Transmitter and receiver for streaming media including packet padding
Fusing apparatus and image forming apparatus provided with the same, and heating apparatus
Method and apparatus for focusing electrical stimulation in the brain during electro-convulsive therapy
Processor micro-architecture for compute, save or restore multiple registers, devices, systems, methods and processes of manufacture
Method of controlling semiconductor device, signal processing method, semiconductor device, and electronic apparatus
Database caching utilizing asynchronous log-based replication
  Randomly Featured Patents
Coaxial connector for interconnecting printed circuit boards
Locking device of tailgate for vehicle
Method of measurement in chromatography
Brush storage and fluid dispensing device
Broadcast reception device and method capable of obtaining broadcast time information
Lecithin as a wettability enhancing coating for plastic
Image-taking apparatus
Finish stapler
Stirrup adjuster
Adhesive dispensing pump control system