CN201274496Y - WTB-Ethernet gateway device - Google Patents

Abstract

The utility model discloses a WTB-Ethernet gateway device which is characterized by comprising a core processing circuit, a WTB shared RAM connected with the core processing circuit, an MCU microcontroller, an HDLC controller, an FPGA processor, a WTB bus drive, an Ethernet protocol controller, an isolation transformer and an Ethernet physical-layer interface. The core processing circuit uses the WTB shared RAM to communicate data with the MCU microcontroller, and the communicated data is converted by the HDLC controller and the FPGA processor into a Manchester signal which is transmitted to a WTB bus by the WTB bus drive. Meanwhile, the data is also transmitted to the Ethernet protocol controller and converted into a link layer message which is changed by the isolation transformer into an isolated differential level signal; and then the isolated differential level signal is transmitted to the Ethernet through the Ethernet physical-layer interface. The WTB-Ethernet gateway device can be widely applied to railway trains, subway trains, urban rail traffic vehicles and the field of industrial control of the automatic classification.

Description

WTB-ethernet gateway equipment

Technical field

The utility model relates to the WTB network control system that meets the TCN standard, is the WTB network communication apparatus with ethernet communication ability.Be widely used in the industrial control field that real-times such as railroad train, subway train and urban rail transit vehicles are had relatively high expectations, can be organized into groups automatically.

Background technology

IEC61375-1 " TCN " (being called for short the TCN standard) is an international standard, also is the China railways industry standard.The TCN standard is the standard for Fieldbus that is this special application field design of rail vehicles, and it has formulated the communication system of an opening, thus make various rolling stocks can mutually interconnected extension, the equipment of different vendor can be interconnected.The TCN standard has defined multifunction vehicle bus MVB and two kinds of forms of wired train bus WTB altogether, and wherein the MVB bus connects the equipment in the vehicle, and the bus operating frequency is 1.5Mbit/s, and medium is twisted-pair feeder or optical fiber.The MVB bus provides two kinds of transmission services at link layer: (1) process data: periodic, and source addressable broadcast data; (2) message data: stage by demand the data message of target addressing.

Ethernet is one of fieldbus of tool development prospect of generally acknowledging, and the IEEE802.3 standard is its international standard.Ethernet standard is followed the ISO/OSI model, has adopted link layer wherein, transport layer, network layer, session layer, presentation layer and application layer.Ethernet is the communication network of distributed control of a kind of effective support and real-time control system, has outstanding reliability, real-time and flexibility.

At present, because the service request of railer's information system, domestic and international advanced TCN network control system need pass through Ethernet interface, carry out data communication with wireless networks such as GPRS, CDMA, GPS, train information is sent to remote monitoring center, is convenient to the regular maintenance and the maintenance of train apparatus.So the WTB-ethernet gateway just becomes the essential key equipment of TCN network control system, make Ethernet reach seamlessly and combine with the WTB network.Though can directly purchase external WTB-ethernet gateway, but the domestic WTB-ethernet gateway that also is not applied to the rolling stock industry with independent intellectual property right, so succeeding in developing of WTB-ethernet gateway, indicate that whole WTB-Ethernet switch technologies capture, filled up the blank in domestic this field, make the TCN network control of China technical a new step.Technological innovation for domestic rail vehicles industry has realistic meaning.

Summary of the invention

The purpose of this utility model provides a kind of novel WTB-ethernet gateway equipment, is mainly used in the WTB network control system of railroad train, subway train and city rail industry, connects ethernet network device.It had both had WTB process data function, message data function and bus management function, also had ethernet link layer, transport layer, network layer, session layer, presentation layer and application level function.

Technical solution of the present utility model is achieved in that

A kind of WTB-ethernet gateway equipment, it is characterized in that comprising core processing circuit, the WTB RAM Shared that is electrically connected with it, MCU microcontroller, hdlc controller, FPGA processor, WTB bus driver, Ethernet protocol controller, isolating transformer and ethernet physical layer interface, core processing circuit wherein utilizes WTB RAM Shared and MCU microcontroller to carry out data communication, transform generation Manchester signal by hdlc controller and FPGA processor, be sent on the WTB bus through the WTB bus driver; Also data are sent in the Ethernet protocol controller simultaneously and are converted into link layer message, become the differential level signal of isolation, be sent to Ethernet through the ethernet physical layer interface and get on by isolating transformer.

Described core processing circuit comprises central processing unit, the FLASH that is electrically connected with it, SDRAM, electric power management circuit, reset circuit, Nonvolatile memory cell and real-time clock.Core processing circuit is not only finished WTB process data function, message data function and bus management function as the gateway core processing unit, also finishes ethernet link layer, transport layer, network layer, session layer, presentation layer and application level function.Central processing unit generates the data flow that is used for the rail vehicle diagnostic analysis with the data message of gathering simultaneously, is stored in Nonvolatile memory cell.

Described MCU microcontroller is WTB server parts, finishes WTB bus links layer function; The WTB bus driver is a core with RS485 protocol controller and MOSFET device, finishes WTB bus physical layer function; The WTB RAM Shared is physical medium with SRAM, storage related communication data.Core processing circuit and MCU microcontroller are visited the SRAM district of WTB RAM Shared simultaneously, solve the contention collision problem by control signal, when the same address location of both sides' contention, hardware circuit can come which side of ruling that the right to use is arranged according to address, sheet choosing and the read-write arrival sequencing on both sides in its sheet, avoids therefore and the read-write mistake that produces.And the MCU microcontroller generates Manchester signal by hdlc controller and FPGA processor with data conversion, finishes operation to the WTB bus through the WTB bus driver.

Described Ethernet protocol controller is the core component of ethernet network, finishes the ethernet link layer function; The ethernet physical layer interface is a core with the RJ45 connector, finishes the industry ethernet physical layer function; Isolating transformer carries out electrical isolation with differential signal.Core processing circuit carries out the electrical isolation adjustment by data wire and address wire concurrent access Ethernet protocol controller through isolating transformer, through the ethernet physical layer interface ethernet network is operated.

Compared with prior art, advantage of the present utility model is:

(1) the utility model meets IEC61375 and IEEE 802.3, has filled up the domestic blank of changing this technical field at WTB network and Ethernet data.

(2) the utility model provides the through engineering approaches application platform based on IEC61131-3, has improved the through engineering approaches level, has reduced the engineering development cost, has shortened construction period.

(3) the utility model has passed through TCN networking products routine test project, finishes and external WTB consistency of product test.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the hardware structure diagram of the utility model core processing circuit.

Fig. 3 is the utility model central processing unit and peripheral circuit interface circuit figure thereof;

Fig. 4 is the utility model MCU microcontroller and peripheral circuit interface circuit figure thereof;

Fig. 5 is the utility model Ethernet protocol controller and peripheral circuit interface circuit figure thereof;

Fig. 1 is a specification digest accompanying drawing of the present utility model.

Embodiment

A kind of WTB-ethernet gateway equipment as shown in Figure 1 comprises core processing circuit, WTB RAM Shared, MCU microcontroller, hdlc controller, FPGA processor, WTB bus driver, Ethernet protocol controller, isolating transformer and ethernet physical layer interface.

As shown in Figure 3, described core processing circuit is a core with 32 central processing units, peripheral configuration FLASH, SDRAM, electric power management circuit, Nonvolatile memory cell, reset circuit and real-time clock.Wherein said central processing unit is selected 32 bit processor NET+50 of NetSilicon company for use, and its embedded ARM7TDMI nuclear is supported 32 internal buss, 40 programmable Is/O interface pin is arranged, 16 input interface pins, 36 programmable Interrupt.In the native system, the crystal oscillator frequency of processor is 18.432M, and the cycle of asynchronous access SDRAM is 60ns.Because the stand-by period that the WTB protocol controller inserts can reach 10us, thereby the access speed of processor has guaranteed reliable reception and the transmission of MCU microcontroller to the WTB bus data.

As shown in Figure 4, described MCU microcontroller is WTB server parts, selects the Z8S180 chip of Zilog company for use, has WTB sophisticated equipment function; The WTB bus driver is a core with RS485 protocol controller and MOSFET device, selects Ltc1485 and ZVN2106GTA chip for use, has transmitting-receiving of RS485 differential signal and level and drives function; WTB RAM Shared circuit is physical medium with SRAM, selects the IS62C1024 chip for use, is used for storing the communication data that core processing circuit and MCU microcontroller exchange mutually.

As shown in Figure 5, described Ethernet protocol controller is the core component of ethernet network, selects the LXT971ALE chip of Intel Company for use, supports the IEEE802.3 standard; It is core that the ethernet physical layer interface is sent out device with ethernet connector, selects the RJ45 device for use, has the industry ethernet of enhancing and drives function; Isolating transformer is that signal is carried out electrical isolation, selects the BE1012 device for use, adjusts and the shaping electric signal.

Claims (1)

1, a kind of WTB-ethernet gateway equipment, it is characterized in that comprising that with 32 ARM7 processors be core, peripheral configuration FLASH, SDRAM, electric power management circuit, voltage monitoring, the core processing circuit of reset circuit and real-time clock, with 8 processor of single chip computer MCU microcontroller that is core, with the ESCC controller is the hdlc controller of core, with RS485 protocol controller and MOSFET device is the WTB bus driver of core, with SRAM is the WTB RAM Shared of physical medium, with the Ethernet phy chip is the Ethernet protocol controller of core, with the physics transformer is the isolating transformer of core, be the ethernet physical layer interface of core and be the FPGA processor of physical medium that with the Ethernet physical connector electric power management circuit is by 5 volts of power lines in the core processing circuit wherein with FPGA, 3.3 volt power line and ground wire provide power supply for all chips in the foregoing circuit; ARM7 processor NET+50 chip by 32 data lines and 14 address wire synchronization of access SDRAM, is finished program implementation simultaneously by 32 data lines and 20 address wire asynchronous access FLASH; Redundant differential data signals on the WTB bus is sent to two RS485 protocol controller Ltc1485 chips respectively by two groups of holding wires, change into two groups of level signals and be sent to the FPGA processor, deposit in the hdlc controller through universal serial bus, be sent in the MCU microcontroller by 8 data lines and 2 address wires again, and deposit in the WTB RAM Shared IS62C1024 chip; ARM7 processor NET+50 chip is by 16 data lines, 19 address wires and control line interlocking mechanism, have precedence over MCU microcontroller Z8S180 visit WTB RAM Shared IS62C1024 chip, and obtain device data, through Ethernet protocol controller LXT971ALE chip parallel data is converted into serial data again, be sent to isolating transformer and carry out the signal electrical isolation, be sent to by ethernet physical layer interface RJ45 device at last and form the Ethernet differential signal on the Ethernet; Otherwise device data transmission course and said process from Ethernet to the WTB bus are similar.

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