The Interleaved Data Channel Filters and Parallel Data Channel Filters features both offer the facility to process multiple input sample streams but using different interfaces. A multichannel interface requires the multiple input streams to be time division multiplexed (TDM) into a single core input, whereas the Parallel Datapaths interface provides an individual core input for each input stream. The choice of interface can influence the resources used by the core. In general, the multichannel implementation uses less DSP slice resources, but under some circumstances this is not the case. The following example demonstrates such a situation.
Consider an 8-tap single rate filter that is to process four 12.5 MHz input streams with a clock frequency of 100 MHz.