DP83869HM: SGMII_to_RGMII bridge mode link up succeed, but fail to transmission data

Hi:

I choose DP83869 to connect SGMII mac with RGMII phy. After pulling up PIN_22 GPIO_1, PIN_36 RX_D3 and PIN_38 RX_CTRL(SGMII_to_RGMII bridge mode), they can link up in 1000M_FULL mode and SGMII mac can receive data from RGMII phy. But RGMII phy cannot  receive data from SGMII mac.

It's even more confusing that if PIN_38 RX_CTRL pull-up is broken the performance of this system is consistent with the above which is supposed to be RGMII_to_SGMII bridge mode.

Because of design error, I cannot get the information of the registers in DP83869HM. I don't know how to find out where the problem lies and wish to get help from you.

Looking forward to your reply!!!!!

Kailyn Chen：

Hello, in order to better solve your question, I have escalated your question to E2E forum and our senior engineer would reply to you, please pay attention to their reply:

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1320117/dp83869hm-sgmii_to_rgmii-bridge-mode-link-up-succeed-but-fail-to-transmission-data