SNLS614A September 2018 – December 2018 DP83869HM
In RGMII-to-SGMII mode Ethernet MAC is connected to the RGMII pins of the DP83869HM and PHY is connected to the SGMII pins of the DP83869. In this mode, DP83869HM will configure SGMII in Auto Mode. In Auto mode, the RGMII side will automatically adjust to the link-up speed on the SGMII side. In case where the PHY is does not have a link, the RGMII clock frequency will default to 2.5 MHz.
After auto-negotiation is completed on the PHY side, the link capabilities are communicated to DP83869HM over the SGMII interface. However, this information is conveyed to the Ethernet MAC through RGMII Inband signaling and RX_CLK adjustment. The MAC can also read this information from the DP83869.
In Bridge mode, the DP83869HM SMI will act as slave mode to MAC.