| 摘要 |
A method for testing the refresh device of an information memory contains the following: a refresh selector for selecting memory cells to be refreshed; a sensor for sensing the state of each cell selected by the selector and a restorer for setting each selected cell into a fresh state, which, in a refresh operating mode of the restorer which effects the refreshing, represents the information derived from the sensed state. According to the invention, at the beginning of the test, the states of the cells that are to participate in the test are verified and before the elapsing of the guaranteed minimum retention time of the memory cells after this verification, the restorer is operated in a test operating mode in which the fresh state that it is to set for each participating cell is in each case a predetermined state which differs perceptively from the previously verified state. A check is subsequently made to determine whether the states of the participating cells set by this operation of the restorer correspond to the predetermined states.
|
