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

Claim 9:
10. The apparatus of claim 9, wherein the ZQ calibration control circuit further includes:
the register, which is configured to store the third fixed code and the fourth fixed code; and
a second selector configured to provide a third ZQ calibration code signal to the first pull-down driver circuit and a fourth ZQ calibration code signal to the second pull-down driver circuit,
wherein the second selector is further configured to:
based on the code selection signal having the first logic level, output the third sweep code as the third ZQ calibration code signal and the fourth fixed code as the fourth ZQ calibration code signal, and
based on the code selection signal having a second logic level, output the third fixed code as the third ZQ calibration code signal and the fourth sweep code as the fourth ZQ calibration code signal.