About the PrimeCell®︎ DMA Controller (PL080) internal FIFOs.

Hi all, I'm a newbie in SoC designs and architecture and also in DMA Controllers. But I started to study a lot of documentations already, including the PrimeCell® DMA Controller (PL080) technical reference manual. It is not clear to me what is the advantage of having the 4 words internal FIFOs. Can someone clarify that for me? Thanks in advance. :)