Apparatus for data recovery in a synchronous chip-to-chip system

摘要

An apparatus (50) that reduces sampling errors for data communicated between devices uses phase information acquired from a timing reference signal such as a strobe signal (DQS) to align a data-sampling signal (DSS) for sampling data signal (DQ1 DQN) that was sent along with the timing reference signal (DQS). The data-sampling signal (DDS) may be provided by adjustably delaying a clock signal (CLK) according to the information acquired from the strobe signal (DQS). The data-sampling signal (DSS) may also have in improved waveform compared to the timing reference signal, including a fifty percent duty cycle and sharp transitions. The phase information acquired from the timing reference signal (DQS) may also be used for other purposes, such as aligning received data with a local clock domain, or transmitting data so that it arrives at a remote device in synchronism with a reference clock signal at the remote device.