An integrated circuit having a normal operating mode and a special operating mode, such as a special test mode, is disclosed. The special test mode is enabled by a series of signals, such as overvoltage excursions at a terminal, rather than by a single such excursion, so that it is less likely that the...http://www.google.fr/patents/US5299203?utm_source=gb-gplus-shareBrevet US5299203 - Semiconductor memory with a flag for indicating test mode
Semiconductor memory with a flag for indicating test mode
