SNLS614A September 2018 – December 2018 DP83869HM
In SGMII-to-RGMII mode, Ethernet MAC is connected to the SGMII pins of the DP83869HM and PHY is connected to the RGMII pins of the DP83869. In this mode, DP83869HM will configure SGMII in Auto. In Auto mode, SGMII will adapt the link speed based on RGMII.
After auto-negotiation is completed on the PHY side, the link capabilities are communicated to DP83869HM over the RGMII interface. However, this information needs to be conveyed to the Ethernet MAC as well. The MAC can read this information from the DP83869HM through the registers.
In Bridge mode, DP83869HM SMI will act as slave mode to MAC. RGMII interface pins will be reversed in this case, TX pins will behave as RX (input data pins) and RX pins will behave as TX (output data pins). This will account for the fact that DP83869HM will act as RGMII MAC for the Ethernet PHY.
In both Bridge modes, PRBS mode of the PHY is not applicable and should not be used.
LEDs, if used, will indicate status on the RGMII side in both Bridge Modes.