| 摘要 |
PURPOSE:To prevent a wafer from mixing with the other wafers, by providing a wafer discriminating memory on a dicing region between mask ROM chips. CONSTITUTION:In a silicon wafer 11 having a mask ROM chip 14 divided by dicing lines 12, 13, discriminating memories 15 are arranged on the dicing line region. An original data of manufacturing maker are programmed on the discriminating memories. By reading the data stored in the discriminating memories, the mixing with the other wafers can be prevented. On the occasion of chip-by- chip separation, the discriminating memories are destructed, so that the data can be prevented from being known by other companies and the like. |
