发明授权
US5615217A Boundary-scan bypass circuit for integrated circuit electronic component and circuit boards incorporating such circuits and components 失效
用于集成电路电子元件的边界扫描旁路电路和包含这样的电路和部件的电路板

Boundary-scan bypass circuit for integrated circuit electronic component
and circuit boards incorporating such circuits and components
摘要:
A method and apparatus for bypassing a boundary-scan cell during functional operation of an electronic component provides a component output signal (such as a data signal) to a boundary-scan bypass circuit during normal functional operation of the electronic component. The component output signal is multiplexed in the bypass circuit with the test result signal that occurs during boundary-scan testing. During functional operation of the electronic component, the component output signal is selected and provided to an output latch that is clocked by a transition of the clock signal of the electronic component. By bypassing the component output signal around the boundary-scan cell during normal operation, the traversing of the multiplexer by the component output signal after the transition of the clock signal of the component is avoided, thereby reducing off-chip delay.
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