AN2647
The 10/100/1000BASE-T SFP modules support all three speeds of Ethernet over twisted pair cable. They connect to the MAC using SGMII mode, which can operate at 10, 100, or 1000 Mbps data rates
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MX RT1xxx supports three variants of the interface: Media-Independent Interface (MII), Reduced Media-Independent Interface (RMII), and devices with Gigabit Ethernet. The DP83869HM device is a robust, fully-featured Ethernet Physical Layer (PHY) transceiver with integrated PMD sublayers that supports 10BASE-Te, 100BASE-TX and 1000BASE-T Ethernet protocols. In STM32-based Ethernet designs, connecting the internal media access controller (MAC) to an external physical layer transceiver (PHY) requires a hardware interface. The two most common interfaces used for this are: Both serve the same purpose, facilitating data transmission between the MAC and. This aims to achieve accurate (or "tight") synchronization when relying on PTP, by allowing the host to compensate for the pluggable's static latency, and to estimate the remaining latency inaccuracy. The presence in pluggables of digital functionalities manipulating Ethernet frames has introduced.