Impedance updating apparatus of termination circuit and impedance updating method thereof

摘要: An impedance updating apparatus includes a terminator circuit for receiving and terminating an external input signal, the having up-terminator down-terminator; update controller separately controlling down-terminator based on level of signal. The at least one latch latching codes programmable controller, being used transistors in down-terminator. performs up-terminator, or when up-update enable signal down-update correspond to predetermined condition. And response during set-up hold time only. method termination up/down terminators separate detecting through which minimum current flows is also provided steps of: determining levels thereby detect between up down terminator; detected flows.