Patent ID: 11860734
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 7:
8. The semiconductor memory device of claim 1, wherein the on-die ECC engine comprises:
a memory to store the ECC;
an ECC encoder, connected to the memory, configured to perform an ECC encoding operation on the main data to generate the first parity data;
a selective poison flag injector configured to:
receive the poison mode signal, the poison flag and the first parity data;
selectively replace a portion of the first parity data with the poison flag to generate the second parity data; and output the second parity data and the poison flag; and

an ECC decoder, connected to the memory, configured to:
perform an ECC decoding operation on the main data read from the normal cell region in the target page using the first parity data read from the parity cell region in the target page; or
perform an ECC decoding operation on the main data read from the normal cell region in the target page and the poison flag read from the parity cell region in the target page using the second parity data read from the parity cell region in the target page.