Arrangement for capturing data

摘要

An arrangement for capturing data from a data stream of a predetermined data transfer rate using a flip-flop, comprises a symmetrical multi-phase clock generator that is adapted to be locked to a reference clock which in turn is adapted to generate a reference clock signal at the data transfer rate or at a fraction thereof. The multi-phase clock generator is adapted to generate "n" clock signals mutually shifted in phase 360°/n from each other. A selector is connected to the clock generator to receive the n clock signals and selects one of these n clock signals as the system clock signal in response to a control signal from a clock phase counter. The clock phase counter is controlled to count up or down in response to the phase of the system clock signal when a predetermined number of data transitions have occurred in the data stream. The flip-flop is controlled by the opposite phase of the system clock signal to capture the data from the data stream.