I am having some trouble figuring out how to get the DMA to transfer
its stated maximum total transfer size of 16k bytes. The TOT_SZ
section of the register is 12 bits wide giving a maximum value of
4095. As far as I can tell, a value of 4095 will transfer only 4095
words/16380 bytes and a value of 0 transfers nothing at all. Hopefully
I have missed something obvious here, how do I get the core to
transfer a 16k block?

bens at improvsys.com wrote: I can't recall whether 0 transfers 0 or 4096 words... but you can use linked descriptors to transfer two 8k-word blocks. This appears to be a common and annoying limitation in other DMA engines as well - the NIOS II DMA engine for example has the same 'feature'. Regards, -- Mark McDougall, Engineer Virtual Logic Pty Ltd, http://www.vl.com.au> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266