HYBRID REFRESH WITH HIDDEN REFRESHES AND EXTERNAL REFRESHES

摘要

A memory subsystem enables satisfying refresh needs for a memory device with hidden refreshes performed by the memory device in response to Activate commands, and external refreshes to make up a difference between the number of hidden refreshes and a minimum number of total refreshes needed during a refresh window. With a hidden refresh the memory device executes the Activate command in one memory portion as indicated by the identified memory location of the command, and executes a refresh in a different portion, such as a different sub-bank. By combining external refreshes with hidden refreshes, the memory subsystem can enable hidden refreshes without the hidden refreshes causing a back-off or retry condition from the memory device to the memory controller.

主权项

1. A memory device to interface in a memory subsystem, comprising:
a first of multiple portions of memory; I/O (input/output) hardware to couple to an associated memory controller, and receive commands from the memory controller, including Activate commands directed to specified memory locations within the first portion; and control logic internal to the memory device, responsive to receipt of an Activate command, to execute the Activate command at a specified memory location of the first portion, and to execute a hidden refresh at a memory location in a second portion different from the first portion; wherein the control logic to further execute external refreshes from the memory controller for the first portion, where a total number of hidden refreshes and external refreshes are to satisfy a minimum number of total refreshes for the first portion during a refresh window.