Patent ID: 8874253

Claim:
A non-transitory computer readable media comprising computer-executable instructions stored therein, the computer-executable instructions comprising: instructions to place a spacer pattern around edges of a photoresist pattern; instructions to strip away the photoresist pattern leaving the spacer pattern; instructions to place a trim mask over a portion of the spacer pattern; instructions to etch away portions of the spacer pattern that are not covered by the trim mask; instructions to remove the trim mask, wherein first remaining portions of the spacer pattern define a plurality of core wordlines; instructions to place a pad mask such that the pad mask and second remaining portions of the spacer pattern define a select gate wordline on either side of the plurality of core wordlines; and instructions to etch through at least one pattern transfer layer using the pad mask and the first and second remaining portions of the spacer pattern to etch the select gate wordlines and the plurality of core wordlines into a poly silicone layer.