Verification Process
The verification process is defined by the IEEE 802.3br as a mechanism to validate the support of the 802.3br standard by both ends of the link.
If the preemption capability and the verification process are enabled, after reset a “verify frame” which consists of a special type of M-frame is transmitted. This frame, when received by the link partner should cause the link partner to transmit a ‘Respond Frame’.
The proper reception of this ‘Respond Frame’ completes the verification process and enables the preemption capability.
If no ‘Respond Frame’ is received within 10ms, the process will automatically be repeated another two times before the preemption capability is disabled. If this happens, the verification process may be restarted through the programming registers.
During the time in which the core is waiting for the Respond packet, the receive traffic will be routed to either the pMAC or the eMAC depending on the value of the 802.3br configuration registers.