SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
The VPDMA primary function is to move data between external memory and internal processing modules that source or sink data. VPDMA is capable buffering this data and then delivering the data as demanded to the modules as programmed. The modules that source or sink data are referred to as clients. A channel is setup inside the VPDMA to connect a specific memory buffer to a specific client. The VPDMA centralizes the DMA control functions and buffering required to allow all the clients to minimize the effect of long latency times. The VPDMA also supports a descriptor based mode where lists of descriptors can be setup to configure all the channels as they become available.
Additionally, in a third-party configuration, the VPDMA is capable of performing DMA transfers as requested by the pulsing of an event strobe. The VPDMA is capable of generation of an address which may reach any location in the range for which it is configured. It is capable of moving this data either to or from a Shared Buffer and ultimately to or from a Client Buffer. For the two type of Client Buffers that are used to drive data into a subsystem (Streaming Buffer and Random Access Buffer) data is either pushed into the buffer or pulled out of the buffer dependent upon the direction of the data transfer. For third-party DMA operations the data is transferred into a Client buffer, and then transferred out of the Client Buffer to the transfer destination. These transfers are triggered by an Event pulse to each of the Client Buffers which are Routing Buffer types.