Method for increasing the transmit and receive efficiency of an embedded ethernet controller

摘要

The invention is to provide a method for increasing the transmit and receive efficiency of an embedded Ethernet controller, which is applicable to an embedded Ethernet controller connected with a local area network and a wide area network respectively for handling packet processing by utilizing a direct memory access structure via an independent data bus, the said method includes the steps of mapping each said receive buffer into a plurality of fixed size packet storage spaces each providing individually separated memory spaces in four-byte alignment to store packet header, packet CRC and packet data, as well as mapping a surplus memory space from a preceding packet, such that it is only necessary to move and change the packet header in the receive packet and then insert a required protocol header into the said surplus memory space to convert the receive packet into a transmit packet.