confused about DMA channels available

hello i have the RIO-PCI7830R fpga pci card

in the card details it says that i have 3 DMA channels available

i want to know how do i count these channels when working like:

i can only have 3 FIFOs working simultaniously : lets say i have a program that requires 3 inputs and 3 outputs can i initialize 6 FIFOs and use them but only 3 at once

or i can only have 3 FIFOs in total that means i can only have 2 inputs and 1 output total of 3

DMA settings of the pci card

   DMA:
      Number of DMA Channels: 3
      Multi-Element Access on Target: Not supported
      Peer-to-Peer Streaming: Not supported