Patent ID: 6380724
Filing Date: 2002-04-30
Classification: G01R

Abstract:
A scannable state element circuit comprising:a first storage circuit configured to receive a data input signal and a scan data input signal, and drive a data output signal and a first scan data output signal; a second storage circuit coupled to said first storage circuit, said second storage circuit configured to receive said scan data input signal and drive a second scan data output signal to said first storage circuit, the first storage circuit being coupled to the second scan data output signal; and, a control circuit coupled to said first storage circuit and said second storage circuit, said control circuit configured to receive one or more scan clock signals and a scan enable signal, and wherein said control circuit is responsive to said scan enable signal and said one or more scan clock signals to cause scan data received via the scan data input signal to pass through said second storage circuit to said first storage circuit via said second scan data output signal without changing a state of said data output signal of said first storage circuit.