Patent ID: 11915781
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 11:
12. An apparatus comprising:
an input/output (I/O) circuit connected to a signal pin, the I/O circuit including a first driver circuit and a second driver circuit;
an impedance control (ZQ) calibration circuit connected to a ZQ pin connected to a ZQ resistor; and
a ZQ calibration control circuit connected to the I/O circuit,
wherein, based on a strength selection signal set in ZQ calibration conditions having a first logic level, the ZQ calibration control circuit is configured to:
provide a sweep code to a stronger driver circuit from among the first driver circuit and the second driver circuit, the sweep code being updated by a calibration operation of the ZQ calibration circuit, and
provide a fixed code to a weaker driver circuit from among the first driver circuit and the second driver circuit, the fixed code being stored in a register.