Apparatuses and methods for per-row count based refresh target identification

An apparatus comprising:

• a memory device comprising:
• a memory array comprising a plurality of word lines;
• a row decoder configured to access a selected one of the plurality of word lines based on a row address;
• a counter circuit configured to receive a count value from the selected one of the plurality of word lines and update the count value;
• an aggressor detector circuit configured to compare the updated count value to a stored count value, and to store the row address and the count value if the updated count value exceeds the stored count value, and configured to provide the stored row address as an aggressor address responsive to a targeted refresh signal if the stored count value has crossed a threshold;
• and
• a refresh address generator circuit configured to generate a refresh address based on the aggressor address and the targeted refresh signal, and further configured to skip generating the refresh address if the aggressor detector circuit does not provide the aggressor address,
• wherein the row decoder is configured to:
• refresh at least one row based on the aggressor address responsive to the targeted refresh signal as part of a targeted refresh operation,
• refresh the at least one row based on the refresh address responsive to the targeted refresh signal, and
• skip the targeted refresh operation if the address generator circuit skips providing the refresh address.

A method comprising:

• accessing a word line of a memory device and updating a count value associated with the word line, wherein the count value is stored in the word line;
• storing a row address and the updated count value in a candidate register of the memory device if the updated count value is a maximum count value;
• comparing, with an aggressor detector circuit of the memory device, the stored updated count value to a threshold responsive to a targeted refresh signal;
• identifying, with the aggressor detector circuit, the stored row address as an aggressor address when the stored updated count value has crossed the threshold;
• responsive to the aggressor detector circuit identifying the aggressor address, generating, with a refresh address generator circuit, a refresh address based on the aggressor address and the targeted refresh signal;
• refreshing one or more word lines as part of a targeted refresh operation responsive to the refresh address and the targeted refresh signal;
• and
• skipping generating the refresh address with the refresh address generator when the stored updated count value has not crossed the threshold;
• and
• skipping the targeted refresh operation if the stored updated count value has not crossed the threshold.