Descriptor Bypass Mode - 3.4 English

Versal Adaptive SoC CPM DMA and Bridge Mode for PCI Express Product Guide (PG347)

Document ID
Release Date
3.4 English

Descriptor Bypass mode also supports crediting and status updates to user logic. In addition, Descriptor Bypass mode allows the user logic to customize processing of descriptors and status updates. Descriptors fetched by the descriptor engine are delivered to user logic through the descriptor bypass out interface. This allows user logic to pre-process or store the descriptors, if desired. On the descriptor bypass out interface, the descriptors can be a custom format (adhering to the descriptor size). To perform DMA operations, the user logic drives descriptors (must be QDMA format) into the descriptor bypass input interface.