In conjunction with Table: Feature Support Matrix and Table: Filter Configuration Support Matrix , 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 utilizing 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.
• Fractional rate filters are not supported.
• Half-band optimizations are not exploited.
• Hilbert transforms are not supported .