Abstract: In the data recovery circuit of the invention, a first group of sampling clock pulses is used for sampling approximately the central portions of the data bits in an incoming data stream to produce a first sampled data stream, while a second group of sampling clock pulses is used for sampling approximately the transition portions between every two adjacent data bits in the incoming data stream to produce a second sampled data stream. By detecting the resemblance of each bit in the second sampled data stream to the corresponding two adjacent bits in the first sampled data stream, a phase detection and correction circuit determines an early condition or a late condition for the phases of the sampling clocks and produces a signal to correct the phases of the sampling clocks by shifting the phases backwards or forwards. According to the invention, sampling clocks with lower frequencies can be used for sampling, and the phase error can be corrected to obtain the correct data recovery.

Abstract: A data recovery circuit for use in a data receiving system to recover an m-bit data stream from an n-bit data stream. The data recovery circuit comprises an n-bit data reconstruction circuit for selecting a data boundary in response to a boundary selection signal and producing a reconstructed n-bit data stream based on the boundary data, a FIFO buffer circuit for temporarily storing the reconstructed n-bit data stream and reading out the m-bit data stream, and a detection circuit for detecting whether the m-bit data stream from the FIFO buffer circuit conforms to a predetermined format and thereby producing a boundary selection signal for controlling the data boundary selection of the n-bit data reconstruction circuit.

Abstract: A data recovery circuit for use in a data receiving system to recover an m-bit data stream from an n-bit data stream. The data recovery circuit comprises an n-bit data reconstruction circuit for selecting a data boundary in response to a boundary selection signal and producing a reconstructed n-bit data stream based on the boundary data, a FIFO buffer circuit for temporarily storing the reconstructed n-bit data stream and reading out the m-bit data stream, and a detection circuit for detecting whether the m-bit data stream from the FIFO buffer circuit conforms to a predetermined format and thereby producing a boundary selection signal for controlling the data boundary selection of the n-bit data reconstruction circuit.

Abstract: In the data recovery circuit of the invention, a first group of sampling clock pulses is used for sampling approximately the central portions of the data bits in an incoming data stream to produce a first sampled data stream, while a second group of sampling clock pulses is used for sampling approximately the transition portions between every two adjacent data bits in the incoming data stream to produce a second sampled data stream. By detecting the resemblance of each bit in the second sampled data stream to the corresponding two adjacent bits in the first sampled data stream, a phase detection and correction circuit determines an early condition or a late condition for the phases of the sampling clocks and produces a signal to correct the phases of the sampling clocks by shifting the phases backwards or forwards. According to the invention, sampling clocks with lower frequencies can be used for sampling, and the phase error can be corrected to obtain the correct data recovery.