Polyphase Filterbank - 2023.2 English

Vitis Tutorials: AI Engine (XD100)

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2023.2 English

The AI Engine supports 16 MAC/cycle with “cint16” data and “int16” coefficients. It follows that four samples of a K=8 tap filter requires two cycles of compute. A single I/O stream delivers exactly four samples over four cycles. It follows this design is “I/O bound” rather than “Compute Bound” because the compute is busy only 50% of the time. The system must process M=16 samples every two cycles. It follows eight AI Engine tiles provide sufficient bandwidth with single stream I/O, each tile performing the compute for two filterbank channels. Additional design details are given below.