There are limited switch and DMA FIFOs on the device. When deciding on
fifo_depth constraints it is important to consider the amount of
FIFOs you specify for an area. This includes taking into account if the nets that have
fifo_depth constraints also have area group constraints. In this
case make sure that all fifo_depth constraints can be
met within the specified area.
If there is a high contention for switch FIFOs, consider moving to DMA FIFOs.
Without changing the fifo_depth you can specify the DMA
FIFO type using the following constraint.
location<fifo>(net1) = { dma_fifo()}With careful consideration FIFO locations constraints can be applied, as shown in the following example.
location<fifo>(net2) = { dma_fifo(aie_tile, 15, 0, 0x3100, 32) };
location<fifo>(net3) = { ss_fifo(shim_tile, 16, 0, 0), dma_fifo(aie_tile, 17, 0, 0x3100, 48)}