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Hi expert,
My customer is using DP83867IR with TI AM5726 and we tried very hard to persuade customer use TI DP83867 and kicked out competitor PHY on this important project, urgent support needed from your side on this project. They are using RGMII interface and plan to use both 1000M or 100M mode. Below is the schematic:
In this schematic, I already let them use RBIAS 11kohm and add pull up resistor on MDIO pins. Also let customer checked the GTX_CLK and RX_CLK, both are confirmed 125MHz.
The first issue customer met is that 100M communication is ok for both receiver and transmit(But may also have some package lost). For 1000M, they can receive from partner but can not transmit to partner. I let them changed the
RGMII_TX_DELAY_CTRL from default 2ns to 1ns(Also tried even 0.25ns, no obvious improvement), then DP83867 can transmit data to partner, but these is many package lost during communication and this cause the communication can't up to 1000Mbps, for example only 300Mbps or like this.
Based on above issue description and your experience. Can you help give some debug suggestions or directions to avoid no package lost or speed can up to 1000Mbps ideally?
Thanks a lot for your support!
Best regards,
Sulyn
