Overview - 2023.1 English

Vitis Tutorials: AI Engine Development

Document ID
XD100
Release Date
2023-09-20
Version
2023.1 English

The goal of this tutorial is to implement the Decimation Filter Chain depicted in the following figure:

Decimation Filter Chain

  1. Open MATLAB by typing model_composer. The path to the various blocksets of Model Composer are automatically added.

  2. In order to initialize the tutorial environment, type setupLab in the MATLAB command window.

This function includes the directory LabUtils in the search path, and runs the filter coefficients initialization. The output in the MATLAB command window is:

>> setupLab
HB1
  Center Tap: 16384
Phase 1 Norm: 16384
 Max Phase 1: 9647

HB2
  Center Tap: 16384
Phase 1 Norm: 16384
 Max Phase 1: 9935

HB3
  Center Tap: 16384
Phase 1 Norm: 16384
 Max Phase 1: 10373

CF
Channel Filter Norm: 32768
           Max Coef: 28004

>>

In the workspace sub-window, you can see that a number of variables that are defined:

  • hb1, hb2, hb3, cfi: Coefficients of the filters which are used in the Simulink model.

  • hb1_aie, hb2_aie, hb3_aie, cfi_aie: Coefficients vectors which are used in the AI Engine design:

    • For half-band filters, this vector contains only the lefthand side non-null taps including the centre tap.

    • For symmetric filters, this vector contains only the lefthand side taps, including the center tap if the filter length is odd.

  • Shift1, Shift2, Shift3, ShiftCF: The number of bits bits by which the result has to be shifted before the result is sent to the ouput port.

Workspace

There are 4 additional files:

  • VMC_DSPLib_Solution_Stage1.slx

  • VMC_DSPLib_Solution_Stage2.slx

  • VMC_DSPLib_Solution_Stage3.slx

  • VMC_DSPLib_Solution_Stage4.slx

These are there to help you if you cannot complete any of the four stages.