Versatile select and hold scan flip-flop

Details Versatile select and hold scan flip-flop Versatile select and hold scan flip-flop

1995-12-27

1997-06-17

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

327203, 327211, 327212, H03K 3289

Patent

active

056401140

ABSTRACT:
A scan flip-flop includes a data input, a scan input, a mode selection input, a mode control input and a clock input. When the mode selection input is set to a first selection value, and the mode control input is set to a first control value, the scan flip-flop operates as a D flip-flop. When the mode selection input is set to a second selection value, the scan flip-flop shifts in a scan input value on the scan input when one of the mode control input and the clock input is toggled. Also, as long as the mode selection input is set to the first selection value, and the mode control input is set to a second control value, the scan flip-flop holds a current value within the scan flip-flop.

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