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

ID 683821
Date 1/14/2022
Public

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8.2.2.2. Metadata Support

Metadata is the 8 byte private data, which the Host wants to send to the device in H2D direction and the device wants to send to Host in D2H direction. In case of AVMM interface, both srcaddr and dstaddr fields are used. In case of AVST interface, dstaddr in H2D, srcaddr in D2H are used to store private meta data. As both addresses are used in AVMM, metadata support is not available if AVMM is enabled.

Table 116.  Field Definition
Field Name in Descriptor Descriptor (Avalon-ST)
srcaddr

H2D - source address of data in host

D2H - 64-bit metadatada

dstaddr

H2D - 64-bit metadata

D2H – destination address of data in host

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