Currently I've got an architecture that only DMAs between slaves on interface #1 of the DMA core. Interface #0 has its slave side connected to a PCI bus master and the master side is not connected (as the DMA core is not currently mastering anything on i/f #0). However, I may need to implement external descriptors - which only fetch from i/f #0. Problem is, the PCI slave that will source the descriptors is currently attached to i/f #1 as it is currently the source/target of DMAs on that interface. I was wondering if it is possible to connect the master side of the DMA i/f #0 up to the slave bus on i/f #1 side solely for fetching external descriptors? i.e. *both* the DMA master units (i/f #0 & 1) would be on the same bus - without an arbiter. Can I be guaranteed that there'd *never* be bus contention between the master units - as the core is either doing a DMA, or fetching descriptors - never both?!? I'm guessing this is possible b/c you can DMA to/from i/f #0 whilst using external descriptors and it all works?!? Regards, -- Mark McDougall, Software Engineer Virtual Logic Pty Ltd, http://www.vl.com.au> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266