In conjunction with the preceding tables, it is important to note some further limitations inherent in the core.
When selecting the Systolic Multiply-Accumulate architecture, the limitations are as follows:
- Fractional Rate filters do not currently exploit coefficient symmetry.
- Non Half-band rate change filters using the advanced channel sequence feature do not exploit coefficient symmetry.
When selecting the Transpose Multiply-Accumulate architecture, the limitations are as follows:
- Symmetry is not exploited.
- Multiple interleaved channels are not supported.
Super sample rate filters (sample frequency greater than clock frequency) have the following limitations:
- Polyphase decimator and polyphase interpolator filters do not exploit symmetry beyond a range of coefficient/data width. This is determined by the device selected.
- For fractional rate interpolation with super sample rate, data and coefficients width must not exceed the input widths of the DSP slice. The greater of the data and coefficients is automatically mapped to input A of the DSP slice.
- Fractional rate decimation filters are not supported.
- Half-band optimizations are not exploited.
- Hilbert transforms are not supported.