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2. Media-independent interface - Wikipedia

   en.wikipedia.org/wiki/Media-independent_interface

   RMII requires a 50 MHz clock where MII requires a 25 MHz clock and data is clocked out two bits at a time vs 4 bits at a time for MII or 1 bit at a time for SNI (10 Mbit/s only). Data is sampled on the rising edge only (i.e. it is not double-pumped). The REF_CLK operates at 50 MHz in both 100 Mbit/s mode and 10 Mbit/s mode.

3. Management Data Input/Output - Wikipedia

   en.wikipedia.org/wiki/Management_Data_Input/Output

   Before a register access, PHY devices generally require a preamble of 32 ones to be sent by the MAC on the MDIO line. The access consists of 16 control bits, followed by 16 data bits. The control bits consist of 2 start bits, 2 access type bits (read or write), the PHY address (5 bits), the register address (5 bits), and 2 "turnaround" bits.

4. Ethernet physical layer - Wikipedia

   en.wikipedia.org/wiki/Ethernet_physical_layer

   The physical-layer specifications of the Ethernet family of computer network standards are published by the Institute of Electrical and Electronics Engineers (IEEE), which defines the electrical or optical properties and the transfer speed of the physical connection between a device and the network or between network devices.

5. IEEE 802.3 - Wikipedia

   en.wikipedia.org/wiki/IEEE_802.3

   IEEE 802.3 is a working group and a collection of standards defining the physical layer and data link layer's media access control (MAC) of wired Ethernet.The standards are produced by the working group of Institute of Electrical and Electronics Engineers (IEEE).

6. Attachment Unit Interface - Wikipedia

   en.wikipedia.org/wiki/Attachment_Unit_Interface

   An AUI connector is a DA-15 (D-subminiature) type, where the DTE side has a female connector and the MAU side has a male connector. [1]The connector often uses a sliding clip instead of the typical thumbscrews found on D-connectors, allowing the DTE and MAU to be directly attached, even when their size or shape would not accommodate thumbscrews.

7. IEEE P802.1p - Wikipedia

   en.wikipedia.org/wiki/IEEE_P802.1p

   The QoS technique developed by the working group, also known as class of service (CoS), is a 3-bit field called the Priority Code Point (PCP) within an Ethernet frame header when using VLAN tagged frames as defined by IEEE 802.1Q. It specifies a priority value of between 0 and 7 inclusive that can be used by QoS disciplines to differentiate ...