Refreshing contents of memory cells in integrated memory circuit involves refreshing word line/group only if at least one memory cell controlled by line/group was written to since switch-on

摘要

The method involves activating a word line to refresh the contents of the memory cells controlled by the relevant word line. The contents of a word line or group of word lines is are only refreshed if in at least one of the memory cells controlled by a word line or group of word lines already has already has data written into it after switching on the memory circuit AN Independent claim is also included for the following: a method of setting a refresh flag, a refresh circuit an activation circuit and a memory element for storing a refresh flag.