Data access device and method applied to communication system
A data access device and data transmission technology, applied in data transformation, transmission system, information storage, etc., can solve problems such as interruption of transmission process and emptying of transmission buffer
Active Publication Date: 2013-07-03
REALTEK SEMICON CORP
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Problems solved by technology
[0004] The reason for the known technology to wait until the NIC has completely downloaded the packet is that the network transmits the packet process is a continuous behavior. If the NIC has not downloaded the complete packet, it starts to transmit the packet. When the network transmission data rate is higher than the NIC from the host download rate , will cause the stored data in the transmission buffer to be read empty (empty), and the transmission process will be interrupted
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[0040] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings.
[0041] Please refer to FIG. 1 and FIG. 2, which are application schematic diagrams of a preferred embodiment of a data access device applied to a communication system according to the present invention. In this embodiment, the data access device 100 is integrated in an Ethernet interface controller , use a main memory 61 from a host 6 to download the packet data, and deliver the packet data to the Ethernet (ethernet) via a network interface, but the present invention is not limited to the Ethernet NIC and the Ethernet. This preferred embodiment comprises a write controller 1, a read controller 2, a transmission buffer 3 (i.e. a first-in-first-out buffer), a download judging device 4 and a direct memory access engine (Direct Memory Access engine, DMA engin...
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The invention relates to a data access device applied to a communication system, which is applicable to downloading data from a host computer and transferring the data to a network interface. The data access device comprises a writing controller, a reading controller, a download judger and a transmission buffer, wherein the writing controller is controlled by the host computer and used for outputting a writing indicator; the reading controller is controlled by the writing controller and used for outputting a reading indicator; the download judger comprises an indicator difference calculator and a comparator circuit, the indicator difference calculator is used for calculating a space between the writing indicator and the reading indicator and using the space as an indicator difference, andthe comparator circuit sends out a download state instruction according to the indicator difference and a first preserved length so as to change the writing indicator; and the transmission buffer downloads data according to the writing indicator and transmits the data according to the reading indicator. The invention also discloses a data access method and a data access device of a network interface controller.
Description
technical field [0001] The present invention relates to a data access device and method, in particular to a data access device and method applied to a communication system. Background technique [0002] In a general network communication system, a host (host) transmits data stored in a main memory of the host to the network through a Network Interface Controller (NIC for short). [0003] Because the NIC needs to store the data temporarily before transmitting the data from the host to the network, the NIC will include a transmitting buffer. It is known that the NIC divides the transmitting buffer it includes into one or several pages. ) to respectively store a network frame packet downloaded from the main memory. When the transmit buffer is divided into a page, the page stores the downloaded packet data, and the packet is not delivered to the network until the page stores a complete packet, resulting in poor throughput. When the transmission buffer is divided into two pages...
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IPC IPC(8): G06F5/12G11C19/28H04L12/861G06F12/00
Inventor 杨国男许嘉华古丰瑞施彦旭
Owner REALTEK SEMICON CORP