I have designed a customer board with AR8031 PHY and I.MX6DL, and found the board only works with 10/100M stably, when connected to a GIGA-bit router or switch, the connection is very slow and many packages are lost.
Is there anyone with the same issue? Circuit of this portion is strictly following with the SABRESDP reference, only the RGMII signal traces are a little bit longer of up to 4000mils comparing the reference of ~1700mils. Not sure this is the root cause. 125M clock is there and enhancing the VDDIO_REG of AR8031 to 2.5V behaves the same thing.
Can anyone help with this issue? Thanks.