Shulou(Shulou.com)06/01 Report--

In this issue, the editor will bring you how to understand MAC PHY. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

1. After MAC receives IP packets (or packets from other network layer protocols) from the PCI bus, it is split and repackaged into the frame with the largest 1518Byte and the smallest 64Byte. This frame includes the destination MAC address, your own source MAC address, and the protocol type in the packet (for example, the type of IP packet is represented by 80). Finally, there is a CRC code for DWORD (4Byte).

two。 One end of the Ethernet MAC chip is connected to the computer PCI bus, and the other end is connected to the PHY chip. They are linked through the MII interface.

3. PHY is a physical interface transceiver that implements the physical layer.

4. When PHY sends data, it receives the data from MAC (for PHY, there is no concept of frame, for it, it is all data regardless of address, data or CRC. For 100BaseTX, because of using 4B/5B coding, the error detection code of 1bit is added to each 4bit), then the parallel data is converted into serial stream data, and then the data is encoded according to the coding rules of the physical layer, and then sent out into an analog signal. The process of receiving data is vice versa.

5. PHY also provides important functions of connecting with peer devices and shows its current connection status and working status through LED lights to let us know.

The above is how to understand the MAC PHY shared by the editor. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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