AI Engine and PL Kernels Data Communication - 2024.1 English

AI Engine-ML Kernel and Graph Programming Guide (UG1603)

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2024.1 English

The AI Engine-ML array interface contains modules to communicate between AI Engine-MLs and PL kernels using AXI4-Stream connections. Generally, PL interfaces produce or consume data through stream interfaces. Based on whether buffer or stream data is communicated by the AI Engine kernels, DMA and ping-pong buffers could be involved.

Note that PL kernels run at a lower frequency than AI Engine kernels. Data must cross the clock domains between the AI Engine-ML clock and PL clock. The AMD Vitis™ environment handles the clock domain crossing (CDC) path automatically. It is recommended to run the PL kernel frequency as an integer factor of the AI Engine-ML frequency, if possible. For instance, as ½ or ¼ of the AI Engine-ML clock frequency.