| 摘要 |
A circuit for control and observation of a scan chain. The circuit comprises a group of first scan cells connected in series, receiving a first data signal and outputting a second data signal, a multiplexer receiving the first and second data signal, and selectively outputting the first and second data signal in response to a selection signal, and a group of second scan cells connected in series, receiving the first or second data signal from the multiplexer, and outputting a third data signal.
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