Patent ID: 8576634

Claim:
A semiconductor device comprising first and second nonvolatile memory elements formed over a semiconductor substrate, wherein the first nonvolatile memory element has: a first gate insulating film formed over the semiconductor substrate; a first gate electrode formed over the first gate insulating film; a first charge-storage film formed over the semiconductor substrate and over a side face of the first gate electrode; a second gate electrode formed over the first charge storage film, wherein the second nonvolatile memory element has: a second gate insulating film formed over the semiconductor substrate; a third gate electrode formed over the second gate insulating film; a second charge-storage film formed over the semiconductor substrate and over a side face of the third gate electrode; a fourth gate electrode formed over the second charge storage film, wherein the second and fourth gate electrodes are each in a form of a side wall; wherein a rewriting frequency of the second nonvolatile memory element greater than a rewriting frequency of the first nonvolatile memory element, wherein, in a gate width direction, a width of the fourth gate electrode is larger than a width of the second gate electrode, and wherein, in the gate length direction, a length of the second gate electrode is equal to a length of the fourth gate electrode.