The AI Engine-ML has one 32-bit input
AXI4-Stream interface and one 32-bit output
AXI4-Stream interface. A fifo_depth() constraint specification allocates FIFOs from the stream
switch (one 16-deep FIFO in each stream switch). The following is an example of a FIFO
allocation on the stream switch requesting a fifo_depth(8).
Figure 1. FIFO Allocation on Stream Switch
A maximum FIFO depth of 40 words is the default threshold. To increase this
limit, use the --swfifo-threshold compiler option, but
any increase requires additional resources to route the design.