•  Sinusgenerator.bit - Use <Sw0> to select the frequency of the output seen at <Ld0> (what do you expect to see?)
                                          The UPdown bit will be shown at <Ld7>
                                          Remember that its possible to select the system frequency: 25, 50 or 100 MHz

•   SinusGen2.zip - Zippet project (ISE 9.2i) of the SinusGen2

This version based at the fact that Sin( x) = Sin( Pi -x) and Sin( x) = -Sin( x + Pi).     How much memory capacity  can be saved this way?