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What is Ethernet MAC and PHY?
The Ethernet PHY is connected to a media access controller (MAC). The MAC is usually integrated into a processor, FPGA or ASIC and controls the data-link-layer portion of the OSI model. The physical mediums that carry the data to the Ethernet PHY include twisted pairs, CAT5, coaxial cables, backplanes and fiber optics.
What is Phy address?
This is an identifier that tells you which of the physical PHYs were used to interface to the network. The numbers range from 0 – 31 and change, depending on whether or not you specified a specific PHY or if you let the driver select the default (which varies from card to card).
Why do we need Ethernet PHY?
An Ethernet PHY is designed to provide error-free transmission over a variety of media to reach distances that exceed 100m. The Ethernet PHY is connected to a media access controller (MAC). The MAC is usually integrated into a processor, FPGA or ASIC and controls the data-link-layer portion of the OSI model.
What is Mdio in Ethernet?
Management Data Input/Output (MDIO), also known as Serial Management Interface (SMI) or Media Independent Interface Management (MIIM), is a serial bus defined for the Ethernet family of IEEE 802.3 standards for the Media Independent Interface, or MII.
What PHY means?
PHY is an abbreviation for the physical layer of the OSI model. An instantiation of PHY connects a link layer device to a physical medium such as an optical fiber or copper cable. A PHY device typically includes a Physical Coding Sublayer and a Physical Medium Dependent layer.
What is PHY count?
A physical count is an actual count of the goods in stock. This is a carefully coordinated counting process in which counting areas are segregated and count teams examine assigned inventory areas, recording their counts on count sheets.
What is the management data input / output ( MDIO ) interface?
The Management Data Input/Output (MDIO) serial bus is a subset of the MII that is used to transfer management information between MAC and PHY. At power up, using autonegotiation, the PHY usually adapts to whatever it is connected to unless settings are altered via the MDIO interface.
How is the media independent interface ( MII ) defined?
Media-independent interface. The media-independent interface (MII) was originally defined as a standard interface to connect a Fast Ethernet (i.e., 100 Mbit/s) media access control (MAC) block to a PHY chip. The MII is standardized by IEEE 802.3u and connects different types of PHYs to MACs.
What is the reduced media independent interface ( RMII )?
Reduced media-independent interface (RMII) is a standard which was developed to reduce the number of signals required to connect a PHY to a MAC.
When was the GMII interface defined in IEEE 802.3z?
The GMII interface was first defined for 1000BASE-X in IEEE 802.3z-1998 as clause 35, and subsequently incorporated into IEEE 802.3-2000 onwards. There are two transmitter clocks. The clock used depends on whether the PHY is operating at gigabit or 10/100 Mbit/s speeds.