Patent ID: 7157325

Claim:
A method for fabricating a semiconductor memory device in which a logic circuit and a nonvolatile memory are provided on a semiconductor substrate, the method comprising the steps of: forming a trench in the semiconductor substrate and burying an insulating film in the trench, thereby forming an isolation region; forming a protective film made of an insulating material over the semiconductor substrate in a logic circuit region where the logic circuit is to be formed and a nonvolatile memory region where the nonvolatile memory is to be formed; selectively introducing impurity ions in part of the semiconductor substrate in the logic circuit region; removing the protective film formed over the logic circuit region; forming a first conductive film on the semiconductor substrate in the nonvolatile memory region after the step of forming the isolation region has been performed and before the step of forming the protective film is performed; and forming a second conductive film on the protective film after the step of forming the protective film has been performed, wherein the step of introducing the impurity ions is performed before the step of removing the protective film is performed, and the protective film serves as an insulating film for insulating the first conductive film and the second conductive film from each other.