Methods are provided for fabricating a memory device comprising a dual bit
memory cell. The method comprises, in accordance with one embodiment of
the invention, forming a gate dielectric layer and a central gate
electrode overlying the gate dielectric layer at a surface of a
semiconductor substrate. First and second memory storage nodes are formed
adjacent the sides of the gate dielectric layer, each of the first and
second storage nodes comprising a first dielectric layer and a charge
storage layer, the first dielectric layer formed independently of the
step of forming the gate dielectric layer. A first control gate is formed
overlying the first memory storage node and a second control gate is
formed overlying the second memory storage node. A conductive layer is
deposited and patterned to form a word line coupled to the central gate
electrode, the first control gate, and the second control gate.