| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To control redundancy operation according to a user's program setting (encryption) and to make it possible to repair a defect even if the defect occurs during memory testing or after completion of a package. <P>SOLUTION: Fail addresses are stored in a redundancy coding cell of a redundancy coding section composed of a redundancy master cell and a plurality of redundancy cells, and if input addresses satisfy conditions encrypted by a user, a master signal is activated through the redundancy master cell by outputting to the redundancy coding section a set signal, a reset signal, and a first group of control signals. If the input addresses correspond to the fail addresses stored in the redundancy coding cells, a second group of control signals are outputted by performing a logical operation of the master signals, signals are outputted, and then a third group of control signals are outputted for inactivating normal input/output and activating redundancy input/output paths by the operation of a redundancy control section which receives the second group of control signals as its input. <P>COPYRIGHT: (C)2004,JPO</p> |
