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  • What does PHY refer to? - Electrical Engineering Stack Exchange
    I have seen the abbreviation PHY beeing used for a handful of different things within the context of Ethernet: a PHY is a type of Ethernet physical layer (eg 100BASE-TX, 10BASE-T) a PHY is an Ethernet transceiver IC (eg an IC that converts 100BASE-TX to MII RMII) a PHY is a physical layer device (more than just the transceiver IC)
  • what is the difference between PHY and MAC chip
    A PHY chip or layer converts data between a "clean" clocked digital form which is only suitable for very-short-distance (i e inches) communication, and an analogue form which is suitable for longer range transmission It has no particular clue as to what any of the bits "mean", nor how they should be interpreted or assembled
  • ethernet - What is the difference between the PHY sublayers PCS, PMA . . .
    I'm reading Analog Device's Beginner's Guide to Ethernet It's really good and goes into concepts like Manchester Encoding, 4B 5B, NRZT, MLT3 which seem to make sense to me
  • Connecting a PHY to another PHY on a same board
    Generally, if I'm connecting a PHY to RJ45 connector, I would add center tap capacitors and Bob-Smith termination like below But if I am connecting a PHY to another PHY, do I still need the Bob-Smith termination? Or can I just have center tap capacitors on both sides like below? Both PHYs share same GND but are powered by different rails
  • ethernet - PHY address for SPI interface - Electrical Engineering Stack . . .
    The "PHY address" you refer to is an MDIO bus address MDIO is a management interface between a MAC and one or more PHYs In the case of the W5500, the MAC and PHY are integrated in the chip Refer to the W5500 block diagram (green lines added by me): So there's no need for an external management interface, or for PHYAD pins
  • ethernet - PHY to PHY connection (KSZ9477S and DP83849IF) - Electrical . . .
    I want to connect two phys on pcb through AC coupling (max path 150 mm), one PHY is KSZ9477S embedded PHY, other is DP83849IF PHY The schematic is attached At first the I made a direct connection and it was 100 Frames per second loss
  • MIPI C-PHY Signal Routing - Electrical Engineering Stack Exchange
    So the only practical way to support both D-PHY and C-PHY in the same layout is to route the signals separately, as single-ended In fact C-PHY requires it; D-PHY doesn’t care so much What won’t work is trying to run C-PHY (single-ended) over a D-PHY (differential) layout The trio members will interfere with each other too much
  • phy - RSET pin function of RTL8211E - Electrical Engineering Stack Exchange
    This specific datasheet doesn't specify what the value for the RSET resistor should be But after a bit of looking around, I found another datasheet, page 8 for a Realtek IC (PHY) which uses a bandgap reference as well and they use a value of 2 49k for that resistor The regulator voltages are about the same for both ICs (1 05V vs 1 0V)
  • Ethernet PHY - Electrical Engineering Stack Exchange
    I would expect to see the ARP requests out of the board on Wireshark We have also tried using an MDI-X cable, and getting a dump of the PHY registers confirms that it detected the crossover and corrected it (PHY supports auto MDI-X) In all cases, the link lights on both devices indicate that the link is up and there is activity on the line





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