Multi Channel DMA Intel® FPGA IP for PCI Express User Guide

ID 683821
Date 10/29/2021
Public

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3.1.6.4. Metadata

When streaming DMA data, user can optionally enable 8-byte Metadata that contains metadata for user application. When enabled, the H2D descriptor destination address field is replaced with metadata and D2H descriptor source address field is replaced with Metadata.

With Metadata enabled, Avalon-ST SOF qualifies only the metadata and does not have any data. Since the metadata size is always 8 bytes with predefined property, user side does not expect an empty signal.

Figure 8. Avalon-ST Source Timing Diagram with Metadata enabled

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