US 11,888,476 B2
Apparatus, memory device and method for storing parameter codes for asymmetric on-die-termination
Daehyun Kwon, Seoul (KR); Hyejung Kwon, Seoul (KR); Hyeran Kim, Uiwang-si (KR); and Chisung Oh, Suwon-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Feb. 2, 2022, as Appl. No. 17/591,093.
Claims priority of application No. 10-2021-0042234 (KR), filed on Mar. 31, 2021; and application No. 10-2021-0076234 (KR), filed on Jun. 11, 2021.
Prior Publication US 2022/0321125 A1, Oct. 6, 2022
Int. Cl. H03K 19/017 (2006.01); H03K 19/00 (2006.01); H03K 19/17736 (2020.01); H03K 19/17772 (2020.01)
CPC H03K 19/01742 (2013.01) [H03K 19/0005 (2013.01); H03K 19/1774 (2013.01); H03K 19/17772 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus connected to an external device via a signal line, the apparatus comprising:
an on-die termination (ODT) circuit set in a first ODT state;
a plurality of signal pins, each of which is connected to the signal line; and
an ODT control circuit configured to:
obtain information from the external device indicating a second ODT state of the external device,
identify whether the second ODT state indicated by the information obtained from the external device corresponds to the first ODT state to determine whether a termination state of the apparatus is a symmetric ODT or an asymmetric ODT, and
based on the termination state of the apparatus being the asymmetric ODT in which the first ODT state and the second ODT state are different, provide an asymmetric ODT parameter code to the external device, and disable the ODT circuit when a signal is not transmitted through the signal line.