Gigabit-level SpaceWire router

Abstract

The invention provides a gigabit-level SpaceWire router, and belongs to the technical field of routers. The embodiment of the invention provides a gigabit-level SpaceWire router. After serial codes sent by an external transceiver are received through an optical fiber, the serial codes are converted into parallel data through a 16B / 20B codec; protocol processing is performed on the parallel data toobtain uplink data, after the uplink data is forwarded, protocol processing is carried out on the parallel data again to obtain downlink data; downlink data is converted into serial data through a 16B / 20B codec; and the converted serial data is sent to the external transceiver through the optical fiber, so that the upper limit of the physical bandwidth is improved, 16-bit information can be processed in one clock period, the processing capacity of the DS coded data is 16 times that of the 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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