Simple Filter Chain Example - 2021.2 English

Versal ACAP System and Solution Planning Methodology Guide (UG1504)

Document ID
Release Date
2021.2 English

To illustrate throughput and latency considerations when working with FIR filters, the following example shows a channel filter followed by an interpolating half-band filter.

Figure 1. Simple Filter Chain Example
  • Implementation 1: Channel and Interpolation filter kernels placed into their own individual AI Engine tiles.

    The ping-pong buffers are just one deep to manage the data across the simple example.

    Figure 2. Graph View from Vitis Analyzer
  • Implementation 2: Channel filter is split across four AI Engines to improve the throughput.

    Notice how the data on the input needs additional buffering, including four ping-pong pairs, (green box) to service these four AI Engine kernels. However, the overall throughput increases as a result of this partitioning, and there is a trade-off to be made with respect to AI Engine resource utilization.

    Figure 3. Graph View Showing Channel Filter Split Across Four AI Engine Tiles