Xilinx System Generator v2.1 Reference Guide
Block Parameters Dialog Box
The block parameters dialog box can be invoked by
Figure 3-49: DDS block parameters dialog box
Parameters specific to the DDS block are:
∙Function: specifies the block output to be sine, cosine, or both.
∙Negative Sine: when checked, the sine output is negated.
∙Negative Cosine: when checked, the cosine output is negated.
∙Output Width: number of bits in the output signal; value must be between 4 and 32 inclusive.
∙Lookup Table Input Width: specifies the number of address bits into the Sin/Cos Lookup Table; value must be at least 3. It cannot exceed the lesser of the accumulator width and 16 (if block RAM is used), or 10 (if distributed RAM is used).
74 | Xilinx Development System |