Hi Expert,
We found a phenomena of Auto-Negotiation by accidentally set DP83867RGZ Pin47 to an unknown state by MCU. When DP83867 is doing Auto-Negotiation, FLP is sending from channel TX_x_C and TX_x_D. The link partner is sending FLP through TX_x_A and TX_x_B.
When this happen, TX_x_A/B/C/D are sending FLP simultaneously, link cannot be established successfully. We think this is caused by Mirror mode. Need to confirm root cause.
Mirror mode:
A => D
B = > C
MIDX:
A = >B
C = >D
Based on 802.3, DP83867 can detect FLP with channel A & B, but not channel C & D. So if FLP is on channel C & D, then link cannot be established. Is it true? Or there is other mechanism causes this problem?
Thanks.
Zhou
