Circuit and method for correcting skew in a plurality of communication channels for communicating with a memory device, memory controller, system and method using the same, and memory test system and method using the same

Abstract

In a circuit and method for correcting skew among a plurality of communication channels used in communicating with a memory circuit, and in a memory controller and memory controlling method, and in a memory system and method, the circuit for correcting skew includes a transmitting circuit for transmitting a reference signal to input ends of the plurality of channels and through the plurality of channels, and a plurality of receiving circuits for receiving at the input ends of the plurality of channels a respective plurality of reflected signals, the reflected signals being reflected from respective output ends of the plurality of channels. A detection circuit receives the reflected signals and detects relative signal propagation time differences between the plurality of channels. A delay circuit coupled to at least one of the channels sets a signal propagation delay in the at least one of the channels based on the detected relative signal propagation time differences.