Method applied to AFDX exchanger for ensuring uniformity of frame forwarding sequence

Abstract

The invention discloses a method applied to an AFDX (Avionics Full Duplex Switched Ethernet) exchanger for ensuring uniformity between a data frame forwarding sequence and a receiving sequence. The method comprises the steps that a request latch module latches and writes request states of all channels in an FIFO (First Input First Out) according to states of request signals of the request channels; a request processing module reads out data in the FIFO according to the states (namely non-blank) of the FIFO of a latch request, and generates a VL (Virtual Link) checking request signal according to sequences and the states of data bits; a VL checking module of the corresponding channel checks according to the VL checking request signal, and then writes checked frame information data into a VL checked frame information data queue FIFO; and a frame data transferring module transfers a data frame to be stored into a frame buffer storing zone according to information of the VL checked frame information data queue FIFO. The method adopts a request latch and queuing processing method, ensures the uniformity of the forwarding sequence of data frames, and is suitable for hardware realization.

Description

technical field [0001] The invention belongs to the field of network communication, and in particular relates to a method applied to an AFDX switch to ensure that the data frame forwarding sequence is consistent with the receiving sequence. Background technique [0002] As an emerging avionics bus standard, AFDX (Avionics Full Duplex Switched Ethernet) network is based on ordinary Ethernet, and a flow control strategy is added to both the terminal and the switch to ensure the real-time performance of data transmission in the avionics system. [0003] AFDX switch is the core component in AFDX network. In the avionics system, there are strict requirements on the reliability, real-time data, and sequence of data frame forwarding of the AFDX switch. Unlike ordinary commercial switches, it not only needs to realize data forwarding between terminals, but also It supports virtual links (Virtual Link) in the AFDX network, implements traffic policies for each virtual link, and ensur...

AI Technical Summary

Problems solved by technology

In the process of time slice rotation, there will be data frames that arrive later to be checked first, so as to be forwarded first, so that the data frames cannot be guaranteed to be forwarded first, that is, the consistency between the frame data receiving sequence and the forwarding sequence cannot be ensured.

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