DMPRE register [C5471] | TMS320C54x

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Hi guys, 
I'm asking you help regarding this register.. I see from the datasheet
that it's the "DMA  Priority and Enable Control Registerin.
This aside I can't find any documentation regarding its flags..in the
code I'm trying to "reverse engineer" I found this line :

  //Disable DMA channels 4 and 5, and set to low priority
  *(volatile U16*)DMPRE &= ~0xb030;

According to the small comment attached to this line, this instruction
should disable DMA channels 4 and 5 and set (them? all_the_channels?
which_one?) to low priority...
Help would be highly appreciated ! :)
Thanks in advance

InuY4sha 

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DMPRE register [C5471] - inuy4sha - Apr 22 8:14:50 2008