Ethernet controller based network port extension method

Abstract

The invention discloses an Ethernet controller based network port extension method. A multipath Ethernet physical layer and a network extension module are included. The Ethernet controller based network port extension method comprises the steps of receiving a data message from a host port and applying the message to each forwarding logic in a parallel mode by the network extension module; selecting a forwarding target port by utilizing a source MAC address; enabling selected port signal TX-EN to realize data forwarding; by a receiving logic of each extended network port, buffering the received message through a receiving DMA and adding a network port number after a message data segment and forwarding the processed message to a host through a main port sending logic related to the receiving DMA; and finally, realizing binding of a physical port and a logic device in a protocol stack by a host network reception driving program. The Ethernet controller based network port extension method provided by the invention realizes extension of multiple independent ports on basis of an original network port of an MCU; simple upgrade is only required for the original network driving program; very low hardware resource expense is occupied; and the Ethernet controller based network port extension method is simple, and easy to implement.

Description

technical field [0001] The invention relates to a network port expansion method based on an Ethernet controller, belonging to the technical field of Ethernet communication. Background technique [0002] Due to the extensive application of Ethernet and the advanced technology, it also has incomparable advantages in industrial applications and is gradually replacing traditional fieldbus technology, making it the preferred network for industrial control today. As application complexity increases, the number of network ports to IEDs also increases, and each port is often required to be completely independent at the link layer. However, as far as the current mainstream embedded MCU is concerned, there are no more than three MAC controllers on the chip, and there are very few processors with three or more independent network ports. In addition, embedded MCUs will provide dedicated DMA services for integrated MAC controllers to improve network throughput, and each manufacturer wil...

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Problems solved by technology

[0006] The above two schemes achieve network port expansion to a certain extent, but the application places are different, the scope of application is narrow, and there are different defects. The details are as follows: (1) The data throughput performance of the system bus is required to be good or to have similar PCI or PCI-E High-speed port, wiring is difficult, driver modification is relatively large; (2) Although the network port is expanded through the network port, the expanded port is not independent at the link layer. Although it is transparent to high-level applications, it does not meet the requirements to have an independent MAC address. place of application

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