Patent ID: 7278046

Claim:
An output circuit for outputting a strobe signal aligned with a parallel data signal, comprising: a level-change detecting device, comprising: a first flip-flop device receiving said parallel data signal and a first clock signal, and outputting a first latched parallel data in response to said first clock signal; a second flip-flop device connected to said first flip-flop device, receiving said first latched parallel data and said first clock signal, and then outputting a second latched parallel data in response to said first clock signal; and a detector connected to said first flip-flop device and said second flip-flop device, determining a first level change degree of said first latched parallel data and said second latched parallel data, and outputting a select signal according to said first level change degree; a delay adjusting device receiving a strobe signal and differentially delaying said strobe signal into a first and a second delayed strobe signals with a first and a second delay time, respectively; and a first multiplexer electrically connected to said level-change detecting device and said delay adjusting device, and selecting one of said first and said second delayed strobe signals to be outputted in response to said select signal.