Stream Switch FIFO - 2024.1 English

AI Engine Kernel and Graph Programming Guide (UG1079)

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2024.1 English

The AI Engine has two 32-bit input AXI4-Stream interfaces and two 32-bit output AXI4-Stream interfaces. Each stream is connected to a FIFO both on the input and output side, allowing the AI Engine to have a four word (128-bit) access per four cycles, or a one word (32-bit) access per cycle on a stream. A fifo_depth() constraint specification below 40 allocates FIFOs from the stream switch. The following is an example of a FIFO allocation on the stream switch requesting a fifo_depth(32).

Figure 1. FIFO Allocation on Stream Switch