Importance

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Abstract

A scan sequential element device for an integrated circuit receiving three input signals, at least one clock signal as input, and an output comprises: a system sequential element including an input controlled by a first input signal of the device, an input controlled by a second input signal of the device, and an input controlled by one of the clock signals received as input by the device, and a shadow sequential element including an input controlled by the third input signal of the device, an input controlled by the second input signal of the device, and an input controlled by one of said clock signals received as input by the device, the device being configured so the first input signal is propagated to the output of the device through the system sequential element when the second input signal is disabled, and the third input signal is propagated to the output of the device through the shadow sequential element and the system sequential element when the second input signal is enabled, the propagation of the third input signal of the shadow sequential element to the system sequential element being implemented asynchronously, i.e. decorrelated from the clock signals.

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First Claim