CN102347910B - Dual-redundancy real-time network selection system - Google Patents
Dual-redundancy real-time network selection system Download PDFInfo
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- CN102347910B CN102347910B CN201110379213.6A CN201110379213A CN102347910B CN 102347910 B CN102347910 B CN 102347910B CN 201110379213 A CN201110379213 A CN 201110379213A CN 102347910 B CN102347910 B CN 102347910B
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Abstract
The invention aims to provide a dual-redundancy real-time network selection system, which is connected to a plurality of equipment and a set of switch at the same time and used for controlling and selecting one equipment to surf the internet through discrete quantity. The main body of the dual-redundancy real-time network selection system is a large-scale FPGA (Field Programmable Gate Array). The large-scale FPGA comprises an outer control instruction receiving port, a sending control module, a receiving control module, a network configuration module for completing the initial configuration of six MAC (Multi-Access Computer) and the six MAC corresponding to four network pots and two switches. The dual-redundancy real-time network selection system disclosed by the invention has low delay characteristic; once the system needs to be switched, the level state of the discrete quantity is changed; the real-time network selection system switches another equipment to be connected to the switch to surf the internet; and the determinacy of networks is ensured.
Description
Technical field
The present invention relates to a kind of real-time network selective system, for the switching of the multiple equipment of real-time network, make multiple equipment to select access network according to control command.
Background technology
In real-time network, require the equipment of two redundancies all to connect online, but because the port number of switch is limited, two equipment cannot connect on a port of switch simultaneously.
For flight control system, the network interface card of equipment itself has 2 network interfaces of redundancy each other, and two switches form a set of switch, and 2 network interfaces of a respectively corresponding equipment form A, B two paths.Increase a redundance unit if now require, two equipment can only be selected on a port of a connection switch again.
Summary of the invention
The present invention aims to provide a kind of real-time network selective system, connects multiple equipment and a set of switch in order to realize simultaneously, selects one of them equipment online by discrete magnitude control.
Technical scheme of the present invention is as follows:
Two redundancy real-time network selection systems, be arranged between equipment and switch, described equipment, switch all have two, and the network interface card of each equipment itself has A, two network interfaces of B, and two equipment, two switches of A, B network interface and A, B separately form parallel A, B two paths of data transmission channel; The main body of this pair of redundancy real-time network selection system is large-scale F PGA, described large-scale F PGA comprise external control command reception port, send control module (TxCtrl), receive control module (RxCtrl), in order to complete six MAC initial configuration Network conf iotag. module (NetCfg) and corresponding to four network interfaces and two switches amount to six MAC; Described transmission control module (TxCtrl) is provided with A channel and sends buffering area and B passage transmission buffering area, and described reception control module (RxCtrl) is provided with A channel reception buffer zone and B passage reception buffer zone; Like this, A channel sending/receiving buffering area is corresponding to A channel network interface and the switch A of two equipment, and B passage sending/receiving buffering area is corresponding to B passage network interface and the switch b of two equipment; On A channel, the A network interface of two equipment links with A switch through A channel sending/receiving buffering area, and on B passage, the B network interface of two equipment links with B switch through B passage sending/receiving buffering area.
Above-mentioned Network conf iotag. module (NetCfg) mainly comprises link rate configuration, CRC configuration, MAC Address configuration, transmission frame length configuration and Watchdog control circuit.
Above-mentioned A channel sending/receiving buffering area and B passage sending/receiving buffering area are by the multiple sub-buffering area composition of static allocation pattern, and frame length is placed in first unit of every sub-buffering area, and remaining element is placed frame data.
The size of above-mentioned four buffering areas is 4096 × 32, and wherein each buffering area is made up of 10 400 × 32 big or small sub-buffering areas.
Above-mentioned two equipment backup each other, and can be also different working equipments.
The present invention has the following advantages:
This real-time network selective system has the characteristic of low delay, can between switch and equipment, transmit data in real time, guarantees the certainty of network.
Select one of them equipment online by discrete magnitude control, another equipment is in Hot Spare state.Once need to switch, discrete magnitude level state changes, the equipment (another equipment) that real-time network selective system is switched Hot Spare is connected to switch online.
Accompanying drawing explanation
Fig. 1 is real-time network selective system annexation figure;
Fig. 2 is real-time network selective system theory diagram.
Embodiment
The real-time network selective system that the present invention proposes is two remaining ethernet networks, and each equipment is supported A, two Ethernet physical ports of B, is connected respectively on two real-time ethernet switches (switch A and switch b).Real-time network selective system provides connecting path for mutually redundant 2 equipment connections to a set of switch, and its annexation as shown in Figure 1.Outer monitoring judges two equipment (network interface card), by sending external control instruction to two redundancy real-time network selection systems, selects to determine that one of them equipment and switch establish the link.
Real-time network selective system adopts large-scale F PGA to realize, and network is selected to realize by the selection control of MAC layer data interface, as shown in Figure 2.Real-time network selective system comprises 6 MAC, 1 Network conf iotag. module (NetCfg), 1 transmission control module (TxCtrl) and 1 reception control module (RxCtrl).
Network conf iotag. module completes the work such as the initial configuration of 6 MAC, and main deploy content comprises:
A. link rate configuration: according to 10M/100M_IN signal, high level is configured to 100Mbps, and low level is configured to 10Mbps;
B.CRC configuration: configure each MAC and do not carry out judgement, processing and the increase of CRC, keep the transmission of primitive frame between switch and end system;
C.MAC address configuration: configuring each MAC initial address is: 00-00-00-00-00-00, does not carry out the filling of MAC Address when MAC transmission frame is set;
D. transmission frame length configuration: configuration MAC does not limit the length of transmission frame, even if the frame that has occurred being less than 64 bytes or be greater than 1518 bytes in communication is also directly transferred to destination.
In addition, Network conf iotag. module is also carried out the control of house dog, according to the cycle of 1s hello dog.Whole module resets when house dog output low level.
Sending control module TxCtrl realizes from ES1 or ES2 received frame, through buffering after according to network seletion signals QH_LINE_IN (from external control instruction), frame is transferred to switch, in the time that QH_LINE_IN is high level, receives the frame of ES1, during for low level, receive the frame of ES2.TxCtrl comprises 2 buffering area TX_buf, is respectively used to passage A and channel B.4096 × 32 of each TX_buf sizes, comprise 10 buffering areas, each 400 × 32 sizes.Frame length is put in first unit, buffering area, puts afterwards frame data.Control the read and write access of buffering area by read-write pointer TX_buf_write and TX_buf_read, when initial, TX_buf_write and TX_buf_read are 0, ES revises write pointer TX_buf_write while transmission, sends logic and fetches data and while passing to the MAC that connects switch, revise read pointer TX_buf_read.The sky that judges buffering area by pointer state is full, abandons ES transmission frame until buffering area is discontented when full.
Receive control module RxCtrl and realize from switch received frame, after buffering, according to network seletion signals QH_LINE_IN, frame is transferred to ES1 or ES2, in the time that QH_LINE_IN is high level, be transferred to ES1, during for low level, be transferred to ES2.RxCtrl comprises 2 buffering area RX_buf, is respectively used to passage A and channel B.4096 × 32 of RX_buf sizes, comprise 10 buffering areas, each 400 × 32 sizes.Frame length is put in first unit, buffering area, puts afterwards frame data.Control the read and write access of buffering area by read-write pointer RX_buf_write and RX_buf_read, when initial, RX_buf_write and RX_buf_read are 0, along with write pointer RX_buf_write is revised in the reception from switch frame, when fetching data, reception control logic revises read pointer RX_buf_read afterwards.Judge that by pointer state the sky of buffering area is full simultaneously, when full, abandon the frame of new reception until buffering area is discontented.
Claims (4)
1. pair redundancy real-time network selection system, is arranged between equipment and switch, and described equipment, switch all have two, and two equipment backup each other; The network interface card of each equipment itself has A, two network interfaces of B, and two equipment, two switches of A, B network interface and A, B separately form parallel A, B two paths of data transmission channel; It is characterized in that: the main body of this pair of redundancy real-time network selection system is large-scale F PGA, described large-scale F PGA comprise external control command reception port, send control module (TxCtrl), receive control module (RxCtrl), in order to complete six MAC initial configuration Network conf iotag. module (NetCfg) and corresponding to four network interfaces and two switches amount to six MAC; Described transmission control module (TxCtrl) is provided with A channel and sends buffering area and B passage transmission buffering area, and described reception control module (RxCtrl) is provided with A channel reception buffer zone and B passage reception buffer zone; On A channel, the A network interface of two equipment links with A switch through A channel sending/receiving buffering area, and on B passage, the B network interface of two equipment links with B switch through B passage sending/receiving buffering area.
2. according to claim 1 pair of redundancy real-time network selection system, is characterized in that: described Network conf iotag. module (NetCfg) comprises link rate configuration, CRC configuration, MAC Address configuration, transmission frame length configuration and Watchdog control circuit.
3. according to claim 2 pair of redundancy real-time network selection system, it is characterized in that: described A channel sending/receiving buffering area and B passage sending/receiving buffering area are by the multiple sub-buffering area composition of static allocation pattern, frame length is placed in first unit of every sub-buffering area, and remaining element is placed frame data.
4. according to claim 3 pair of redundancy real-time network selection system, is characterized in that: the size of four buffering areas is 4096 × 32, and wherein each buffering area is made up of 10 400 × 32 big or small sub-buffering areas.
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| CN101132284A (en) * | 2006-08-23 | 2008-02-27 | 何自强 | Internet communication device |
| CN101202707A (en) * | 2007-12-03 | 2008-06-18 | 杭州华三通信技术有限公司 | Method for transmitting message of high speed single board, field programmable gate array and high speed single board |
| CN101335602A (en) * | 2008-06-11 | 2008-12-31 | 南京磐能电力科技股份有限公司 | Point-to-multipoint UDP real-time data transmitting and confirming method based on FPGA |
| CN102096648A (en) * | 2010-12-09 | 2011-06-15 | 深圳中兴力维技术有限公司 | System and method for realizing multipath burst data business caching based on FPGA (Field Programmable Gate Array) |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101132284A (en) * | 2006-08-23 | 2008-02-27 | 何自强 | Internet communication device |
| CN101202707A (en) * | 2007-12-03 | 2008-06-18 | 杭州华三通信技术有限公司 | Method for transmitting message of high speed single board, field programmable gate array and high speed single board |
| CN101335602A (en) * | 2008-06-11 | 2008-12-31 | 南京磐能电力科技股份有限公司 | Point-to-multipoint UDP real-time data transmitting and confirming method based on FPGA |
| CN102096648A (en) * | 2010-12-09 | 2011-06-15 | 深圳中兴力维技术有限公司 | System and method for realizing multipath burst data business caching based on FPGA (Field Programmable Gate Array) |
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