V-Series Avalon-MM DMA Interface for PCIe Solutions

Hi to all,

I'm using the V-Series Avalon-MM DMA Interface for PCIe with an external descriptor.

In order to support multi-DMA channels, I implemented two DMA Multi-Channel Controller Example Design (see fig 1).

Unfortunately my architecture doesn't work properly. In fig.2 the bug (fig 3 and 4 for details) Fig 3: The first read (in orange) of 8 words @ 256bit ends. The second read (green) of 48 words @256bit is divided by the DMA Multi-Channel

Controller into 3 subdescriptors with a payload size of 16 words;

the processing READ A is completed. Fig.4

Four write-operation (white and yellow) end properly.

Finally the READ B (in red) of 48 words @256bit (generated by the same descriptor of READ A),

doesn't end... The problem does not occur in case of smaller READ A e B. Thanks Francesca