Intel® Agilex™ Hard Processor System Technical Reference Manual

ID 683567
Date 2/14/2023
Public

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17.6.3.2. Receive Descriptor

The receive descriptor can have 32 bytes of descriptor data (8 DWORDs) when advanced timestamp or IPC Full Offload feature is selected. When either of these features is enabled, software should set bit 7 of Register 0 (Bus Mode Register) so that the DMA operates with extended descriptor size. When this control bit is clear, the RDES0[0] is always cleared and the RDES4‑RDES7 descriptor space is not valid. 

Note: Only enhanced descriptor formats (4 or 8 DWORDS) are supported.
Figure 74. Receive Enhanced Descriptor Fields Format