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What is MAC and PHY in Ethernet?
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 Ethernet PHY address?
In a LAN, each node is assigned a physical address, also known as a MAC/Ethernet address. This address is unique to each of the nodes on the LAN and is 6 bytes (48 bits) long, which is burned on the Ethernet card (also known as the network interface card). Ethernet is a byte-count protocol.
How do I find a PHY address?
To find the MAC/Physical Address/Ethernet ID on a PC:
- Click the Start menu button on the Windows taskbar.
- Type ‘cmd’ in the text box that appears and then press Enter. A black “command prompt” window launches on the desktop.
- In this command window, type ipconfig /all and press Enter.
- Look for Physical Address.
What is difference between MAC and PHY?
The PHY layer defines the physical and electrical characteristics of the network. It is responsible for managing the hardware that modulates and demodulates the RF bits. The MAC layer is responsible for sending and receiving RF frames.
What does a destination address of FFFF FFFF FFFF mean?
ffff. ffff , this is the special reserved MAC address indicating a broadcast frame. This is what makes an ARP Request a broadcast. Had Host A chosen to send this frame using a specific host’s MAC address in the destination, then the ARP request would have been unicast.
What is PHY register?
PHY in short for physical and often used for an Ethernet physical transceiver is an IC that connects to a MAC unit to convert binary data into signals on the line. As PHYs do not exist for Ethernet and cable based networks alone, a PHY can also mean a transceiver for WiFi or other medium.
How do I convert virtual memory to physical memory?
Whenever workloads access data in memory, the system needs to look up the physical memory address that matches the virtual address. This is what we refer to as memory translations or mappings. To map virtual memory addresses to physical memory addresses, page tables are used.
What is Psgmii?
The serial gigabit media-independent interface (SGMII) is the interface with the lowest pin count available for connecting compatible MACs and PHYs. It consists of pairs of Txdata, Rxdata, and Rx Ref Clk data pins.
Is it possible to ditch the Ethernet PHY?
Both of these processors have built in Ethernet MAC. Typical way is to add in an Externet Eth PHY IC on both sides. Is it possible for me to ditch the Ethernet PHY totally and just connect the Eth MAC using MII interface directly?
Can you connect two Ethernet PHY at the same time?
In a (tentative) new design I want to connect two 100 Mbit/s Ethernet PHY similar to LAN8270a, separated by few inches on the same PCB, with same ground plane (but different power supplies).
What kind of clock signal do you need for Mac to Ethernet?
In fact, they already explored this matter at Direct MAC-MAC connection to Ethernet switch without a PHY | NXP Community. According to it, you’ll at least need a 125MHz clock signal (for Fast Ethernet).
What kind of PHY do I need for Ethernet?
What you really need is a different variety of PHY, so called “backplane phy”. Those are specifically designed to work with capacitive coupling over PCB traces. The relevant standard is called 802.3ap.