eCPRI Intel® FPGA IP User Guide

ID 683685
Date 6/21/2024
Document Table of Contents

4.2.2. Receive RX Path

The receiving Ethernet frames from the Ethernet MAC first enters packet classifier block. Packet classifier block classifies the packet into eCPRI packets and non-eCPRI packets. The packet classifier sends eCPRI packets with matching MAC address to the Ethernet header removal block of the eCPRI IP, while sends all other non-eCPRI packets or eCPRI packets with non-matching MAC address to external user logic for processing.

The Data Flow Identification parameter determines the reset default value of match_macaddr_vlanid register bit of cu_vlanid_match_address register. This register bit can be overridden during run time. You shall handle the Run time Data Flow Identification change gracefully (for example, empty the traffic before switching) to avoid indeterministic behavior or decision on the packet routing.

For detailed information on conditions when the IP classifies packet as eCPRI packet, refer to section Packet Classifier.