SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
In order to set up data transfers from the VPDMA, a data transfer descriptor is added into a list. The fields used for an Inbound and Outbound descriptor vary slightly. An outbound transfer can have two different outbound transfers. The two transfers are the main data transfer and a write of an Inbound Descriptor. The created inbound descriptor is formatted so it can be read back in directly to the next channel specified in the original descriptor.
The general data transfer Descriptor formats can be seen in the above figures. The descriptor consists of 8 × 32bit words. A Data Transfer Descriptor will be removed from the list when the resource specified by the Channel field is free. If the Channel is not free when the list reaches a data transfer descriptor then the list will stall until the current transfer on the channel has completed.