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
Maintenance tool of control systems
Femtocell one-to-many packet delivery
Transmission terminal, transmission system, transmission method, and recording medium storing transmission control program
Tactile output device for computing device notifications
Steplessly adjustable cymbal locating device
Image forming apparatus and information processing apparatus
Toner for developing electrostatic charge image, electrostatic charge image developer, toner cartridge, process cartridge, image forming method, and image forming apparatus
  Randomly Featured Patents
Synchronization among plural browsers
Device for a portable automatic syringe
Vehicle wheel shield
Emergency vehicle warning system
Edge curling device for Fourdrinier fabric
Plasma display panel
Methods of accessing floating-gate memory cells having underlying source-line connections
Periodic signal generators having microelectromechanical resonators therein that support surface wave and bulk acoustic wave modes of operation with different temperature coefficients of frequ
Method of and apparatus for transmitting torque in the power trains of motor vehicles
Tilted gantry image correction for a multislice computed tomography system