DSP (Digital Signal Processor) array based device and method for sending Ethernet data

Abstract

The invention discloses DSP (Digital Signal Processor) array based device and method for sending Ethernet data. The device comprises a logic processing unit and a DSP array, wherein DSPs in the DSP array are divided into one or more DSP subarrays according to the service type; and a plurality of output ports of the logic processing unit are respectively connected with the input port of each DSP in the DSP array and used for generating a corresponding time slice for each DSP subarray in the DSP array and controlling the DSPs belonging to the same time slice to transmit message data to an Ethernet controller. In the invention, on the premise of not reducing the traffic of uplink communication ports of the DSP array, traffic bursts are avoided; and each DSP realizes linear speed sending with the maximum capacity through DMA (Direct Memory Access) by adopting an interruption mode, thereby the data sending efficiency is improved.

Description

technical field [0001] The invention relates to an Ethernet technology based on a digital signal processor (DSP, Digital Signal Processor), in particular to a device and a method for realizing Ethernet data transmission based on a DSP array. Background technique [0002] Ethernet is the most common communication protocol standard for local area networks today, which defines the cable types and signal processing methods used in local area networks. The transmission rate of Ethernet between interconnected devices can reach 10Mbps, 100Mbps, 1000Mbps and 10Gbps. [0003] The Ethernet switch chip can provide multiple ports with different transmission rates, and usually uses synchronous random access memory SRAM in the chip, or external synchronous dynamic random access memory SDRAM, double data rate (DDR, Double Data Rate) SDRAM and other media as packet cache . The Ethernet switch chip adopts the store-and-forward principle. When an input port (Ingress) receives an Ethernet da...

AI Technical Summary

Problems solved by technology

[0017] Although this method of sending data by the DSP array can slow down the speed at which the Ethernet data frame occupies the HUB cache, it will take up a lot of CPU time during the waiting process because it uses a delay to wait for the DMA to complete the data transmission and generates a time slice through the software delay. , so the function of DMA and the bandwidth of the Ethernet port cannot be fully utilized

Depend on figure 2 It can be seen that since there is no correlation between DSPs, the time intervals of data transmission by each DSP cannot be staggered, so multiple ports will still send to one port in the same time slice, and the length of each Ethernet data frame is different. The intervals are uneven, and the upstream port FEn+1 may still generate burst traffic at a certain moment and no traffic at another moment, that is, the data traffic sent is extremely uneven

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