DSP Builder for Intel® FPGAs (Advanced Blockset): Handbook

ID 683337
Date 5/27/2022

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15.1.2. Complex Support

Some DSP Builder Primitive library blocks can automatically process complex data, which provides a convenient way to simultaneously generate data and control pathways for the real and imaginary components of such data.

For each complex value, two identical block instantiations generate internally, for the real and imaginary components.

The complex nature of the data propagates. Strictly real signals expand to provide a value for the imaginary component with complex data. The exact behavior depends on the nature of the port associated with the real signal. The real value is duplicated for control or address signals. The real and imaginary parts of complex data are subject to identical control signals. A zero imaginary value generates real data signals in a complex data context. Real data values, x, expand, when required, to x + 0i.

Not all Primitive library blocks support complex data. Data signals are the only signal type permitted to be complex. DSP Builder issues an error message if an attempt is made to drive control or address signals with complex values.