A gigabit spacewire router

Abstract

The invention provides a Gigabit-level SpaceWire router, which belongs to the technical field of routers. The Gigabit-level SpaceWire router provided by the embodiment of the present invention converts the serial code into parallel data through a 16B / 20B codec after receiving the serial code sent by the external transceiver through an optical fiber, and performs protocol processing on the parallel data Finally, the uplink data is obtained, and after the uplink data is forwarded, the parallel data is re-protocol-processed to obtain the downlink data, and the downlink data is converted into serial data through a 16B / 20B codec, and the converted serial data is converted through an optical fiber Sending to the external transceiver not only increases the upper limit of the physical bandwidth, but also enables one clock cycle to process 16-bit information, which is 16 times the processing capacity of DS coded data, and the maximum data transmission rate can exceed 1Gbps.

Description

technical field [0001] The invention relates to a Gigabit-level SpaceWire router, which belongs to the technical field of spacecraft high-speed data transmission bus. Background technique [0002] SpaceWire is a full-duplex, bi-directional, serial, point-to-point data bus. There will be four signal lines (D+, D-, S+, S-) in each direction, for a total of eight signal lines in both directions. The SpaceWire standard involves six levels of content, namely: physical layer, signal layer, character layer, switching layer, data packet layer and network layer six layers. Among them, the physical layer involves physical media such as cables and connectors. Signal layer standards specify signal voltage levels, noise margins, and signal encoding. The signal layer adopts DS (Data-Strobe) coding. This encoding enables the transmission of clock signals and data signals together through two signal lines D and S. At the receiving end, the recovery of the clock signal is achieved by di...

AI Technical Summary

Problems solved by technology

A router with Star-Dundee's SpaceWire Router IP as its core usually includes a port data transceiver module, a port data primary buffer module, a port protocol processing module, a port data secondary buffer module, a destination port arbitration module, and a group routing addressing module , the physical medium is cables, and the bandwidth is generally only a few hundred megabytes, which is difficult to reach the gigabit level; secondly, DS coding is essentially one clock with one data. If the data transmission rate exceeds 1Gbps, the clock cycle should be less than 1ns. The technical implementation is very difficult, so the actual data transmission rate is only 200Mbps

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