Shift register circuit and a method for controlling a shift register circuit
AssigneeWinbond Electronics Corp.
InventorKan-Yuan Cheng
Life of this patent
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Abstract
A shift register circuit including a flip-flop chain and a control circuit is provided. The flip-flop chain is configured to receive an input signal and output an output signal. The control circuit is coupled to the flip-flop chain. The control circuit is configured to receive the input signal and the output signal and output a control signal to activate the flip-flop chain according to edge transitions of the input signal and the output signal. In addition, a method for controlling a shift register circuit is also provided.
Claims15
A shift register circuit, comprising:
- a flip-flop chain configured to receive an input signal and output an output signal;
- and
- a control circuit coupled to the flip-flop chain and configured to receive the input signal and the output signal, and output a control signal to activate the flip-flop chain according to edge transitions of the input signal and the output signal,
- wherein the edge transitions of the input signal and the output signal comprise start of shift events at the input signal and end of shift events at the output signal, and
- the control circuit counts the start of shift events at the input signal and the end of shift events at the output signal, and the control circuit outputs the control signal to activate the flip-flop chain when a first count number of the start of shift events at the input signal and a second count number of the end of shift events at the output signal are different.
A method for controlling a shift register circuit, wherein the shift register circuit comprises a flip-flop chain, the method comprising:
- receiving an input signal and an output signal from the flip-flop chain;
- counting edge transitions of the input signal and the output signal, wherein the edge transitions of the input signal and the output signal comprise start of shift events at the input signal and end of shift events at the output signal;
- comparing a first count number of the start of shift events at the input signal the input signal and a second count number of the end of shift events at the output signal;
- and
- outputting a control signal to activate the flip-flop chain when the first count number and the second count number are different.
Dependencies are inferred from the claim text.