Why do the 25G Ethernet Intel® Arria® 10 FPGA IP core, Intel® 50 Gbps Ethernet (50GbE) IP core, and the 25G Ethernet Intel® Stratix® 10 FPGA IP core incorrectly report oversized frames for VLAN and Stacked VLAN Tagged frames?

Description

Due to a problem with the IP Cores listed above, oversized frames are incorrectly reported to VLAN/Stacked VLAN tagged frames when all conditions below are met:

VLAN frame

1. VLAN Detection is enabled
2. Sending/receiving frame length is between the maximum TX/RX frame length plus 1 to 4 octets

1. VLAN Detection is enabled
2. Sending/receiving frame  length is between the maximum TX/RX frame length plus 1 to 8 octets

Resolution

No workaround for this problem exists in current releases of the IP.

This problem is fixed beginning with the Intel® Quartus® Prime Pro Edition software version 20.4.