SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The Configuration Descriptor is used in a List to setup a client configuration. The configuration descriptor consists of a header and a payload portion. The payload can either be part of the list that the descriptor is contained in or it can be at a separate location. The VPDMA will pass the payload of the configuration descriptor down to the client over the VPI Control port interface or through the MMR configuration port depending on the destination field. A Configuration Descriptor to any single destination except Destination 0 must be on a single list. Configuration Descriptors to different destinations may be on different lists..
The Configuration Descriptor Header is 4 × 32 bit words. A configuration descriptor is not consumed until the destination specified has received the entire configuration payload. Therefore the list is expected to stall while the configuration takes place. This ensures that all descriptors after a configuration descriptor in the list will occur after the desired configuration.