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
Doherty amplifier circuit
Communication device and method for detecting a radio signal
Display unit and display method
Client-managed group communication sessions within a wireless communications system
Printing apparatus
Systems and methods for image stream processing
Method and system for detecting center pivot collision
  Randomly Featured Patents
M-shaped boat hull
Computer program, method, and system for access control
System and method correcting optical proximity effect using pattern configuration dependent OPC models
Pointing-control system for multipoint conferences
Vacuum cleaner
Control apparatus, radar detection system, and radar detection method
Characterization of display devices by averaging chromaticity values
Retainer for fastening balloon string to clothing
Information processing apparatus, information processing method, and program facilitating editing and checking of data
Low field squid MRI devices, components and methods