| 摘要 |
PURPOSE:To prevent hold defect and to reduce a chip area and cost by refreshing a specified cell having an adverse hold characteristic more frequently than refreshing of the other cell. CONSTITUTION:When it is known in advance by an inspection process or the like that the hold characteristic of the specified memory cell in a cell array 10 is adverse, the address data is set into a row decoder controller 50. When selecting the array 10, the controller 50 passes address signals A2-A8, address signals AA2-AA8 are made equal to the signals A2-A8 and the specified word line of the array 10 is selected. On the other hand, when selecting cell arrays 11-13, the controller 50 supplies data set in advance to a decoder 60. Therefore, simultaneously with the word lines in the arrays 11-13, the designated word line in the array 10 is selected as well. Thus, the hold defect is prevented without especially providing any excess redundant circuits. |
