CN202127429U

CN202127429U - Network card interface device of universal hardware platform system

Info

Publication number: CN202127429U
Application number: CN2011202521927U
Authority: CN
Inventors: 周勇
Original assignee: BEIJING AEROSPACE FUDAO HIGH-TECH CO LTD
Current assignee: BEIJING AEROSPACE FUDAO HIGH-TECH CO LTD
Priority date: 2011-07-18
Filing date: 2011-07-18
Publication date: 2012-01-25
Anticipated expiration: 2021-07-18

Abstract

The utility model provides a network card interface device of a universal hardware platform system, which is respectively connected with a micro-processor and external equipment. The micro-processor and the external equipment are included in the universal hardware platform system. The network card interface device is characterized by comprising a local area network (LAN) interface control unit and an LAN bus interface, wherein the LAN interface control unit is connected with the micro-processor, a resistor transistor logic (RTL) 8019 controller is adopted, and the LAN bus interface is connected with the external equipment. By means of the interface device, the micro-processor included in the universal hardware platform system can acquire data from the external equipment and output control signals to control the connected external equipment. Compared with the prior art, the LAN interface device of the universal hardware system can effectively separate influence of other communication circuits, and overcome instability caused by overlarge loading current.

Description

The network interface card interface arrangement of general hardware platform system

Technical field

The utility model relates to a kind of network interface card interface arrangement of general hardware platform system, the network interface card interface arrangement of the general hardware platform system of particularly in various Electronic Control, using.

Background technology

Hardware platform system is the circuit control circuit system that a series of microprocessor, memory are designed according to a requirement.And just being based on the traditional hardware platform, the general hardware plateform system realizes common function.That is to say that general hardware platform system of design is used to multiple device control circuit is provided, and need not all will design again to each device.And in order to adapt to the connection request of multiple device, general hardware platform system often all is provided with multiple communication interface.

Various novel hardware platform system equipment considerably beyond all-purpose computer, arrive network home appliance, intelligent appliance, vehicle electronic device etc. greatly and extensively popularize on number of applications.General hardware platform system is application-centered, and computer technology is the basis, and software and hardware can be reduced, and is applicable to that application system has the dedicated computer system of strict demand to function, reliability, cost, volume, power consumption.It generally is made up of four parts such as embedded microprocessor, peripheral hardware equipment, embedded OS and application program of user, is used to realize the functions such as control, supervision or management to other equipment.

Along with the continuous development of electronic technology, the bussing technique of hardware platform system is very ripe, and transfer of data can adopt a variety of modes to carry out.The circuit of use is few, cost is low, particularly on remote transmission, for fear of the inconsistent influence of many line characteristics, and extensively adopts serial communication mode because serial communication mode has.At present, growing the Distance Transmission data adopts the network interface card communication interface to carry out the communication of short distance or long distance mostly.But owing to LAN system bus, its Driving technique adopt the closed loop current Driving technique mostly; The optically coupled circuit that is connected in series on the system bus needs many, can cause load current bigger like this, causes the instability of control signal easily; If the system bus wire material is relatively poor; Then unsettled situation is more serious, thereby causes influencing each other between the multiple communication interface of hardware platform system, causes the unusual of communication.

Summary of the invention

The utility model is exactly to accomplish in view of the above problems; Its objective is the network interface card interface arrangement that is to provide a kind of general hardware platform system; It adopts simple and reliable structural design; Integrate good power consumption control and low cost, thereby erect the general hardware platform system of high-performance, low cost and a low-power consumption.

The network interface card interface arrangement of the general hardware platform system that the utility model relates to; It is connected with external equipment with the microprocessor that general hardware platform system is comprised respectively, it is characterized in that, comprises network interface card interface control unit and connected network interface card EBI; Wherein, Above-mentioned network interface card interface control unit is connected with above-mentioned microprocessor, adopts the RTL8019 controller, and above-mentioned network interface card EBI is connected with said external equipment.

The effect of the network interface card interface arrangement of the general hardware platform system of the utility model is, between general hardware platform system and peripheral PC or other ancillary equipment, carries out the network interface card serial communication.Through the network interface card interface arrangement that utility model relates to, the microprocessor that general hardware platform system comprised can obtain data from external equipment, and the output control signal is controlled the external equipment that is connected.Network interface card interface arrangement with respect to traditional general hardware platform; The circuit structure that the network interface card interface arrangement that utility model relates to is adopted can isolate effectively and other communication interface circuits between influence each other; The instability that improvement causes greatly because of load current; Make the general hardware platform system that the utility model was suitable for compared with prior art can avoid the unusual of signal of communication more effectively, practicality is stronger.

Description of drawings

Fig. 1 is the whole block diagram of the LAN interface device of the general hardware platform system of expression the utility model.

Fig. 2 representes the LAN interface manipulated or operated apparatus of the general hardware platform of the utility model.

Fig. 3 is the whole block diagram of the expression general hardware platform system that the utility model was suitable for.

Description of reference numerals:

The 1-supply module; 2-keyboard input display unit; 3-keyboard input display unit; 4-LPC processor download module; 5-supplementary functions module; 6-crystal oscillator and reset circuit; The 7-CPLD download module; The 8-LPC processor module; The 9-CPLD module; The multi-functional input/output module of 10-; The 11-IIC bus; The 12-RS232 bus; The 13-RS422 bus; The 14-LAN bus; The 15-IIC bus; The 16-main board bus; The 17-read signal; The 18-write signal; The 19-microprocessor; The 20-LAN interface control unit; The 21-LAN EBI; The 22-external equipment.

Embodiment

Below, in conjunction with accompanying drawing the structure and the operating process of the utility model are explained more specifically.

Shown in Figure 1 is the whole block diagram of LAN interface device of the general hardware platform system of the utility model.

The LAN interface device of the general hardware platform system of the utility model is connected with external equipment 22 with the processor 19 that general hardware platform is comprised respectively; It comprises LAN interface control unit 20 and connected LAN EBI 21; Be used for swap data between microprocessor 19 and external equipment 22, and transmission of control signals is so that control external equipment 22.

Particularly, the microprocessor 19 that hardware platform comprised is connected with LAN interface control unit 20, and LAN interface control unit 20 is connected with LAN EBI 21, and LAN EBI 21 is connected with external equipment 22.The control signal of microprocessor 19 transfers in the external equipment 22 that is connected with LAN EBI 21 through LAN interface control unit 20.The data-signal of external equipment 22 transfers in the microprocessor 19 through the LAN interface control unit 20 that is connected with LAN EBI 21.LAN interface control unit 20 plays the effect of control and swap data therein, and LAN EBI 21 adopts the RJ-45 data-interface.

Fig. 2 representes the LAN interface manipulated or operated apparatus of the general hardware platform system of the utility model.

In the circuit diagram as shown in Figure 2, LAN interface control unit 20 adopts the RTL8019 ethernet controller, and this controller is supported three kinds of working methods: the wire jumper mode, and the IO address of network controller is all determined by wire jumper with interrupting; The wire jumper free mode, the IO address is determined by the content in the external register with interrupting; The plug and play mode, the IO address is all managed automatically and is disposed by software or operating system with interrupting.In the utility model, adopt the wire jumper mode, this mode has not only been simplified hardware circuit design, and has reduced cost.

RTL8019 has two kinds of reset modes: cold reset and hot reset.Apply a high level to reset pin and just can realize cold reset.Perhaps read to write any reseting port of 8019 earlier again and can realize hot reset, it is more that this uses in PC.An IO interface with the microprocessor of hardware platform in the utility model is connected to the reset pin of RTL8019 and realizes cold reset.

The work clock of the RTL8019 that LAN interface control unit 20 among Fig. 2 is adopted is 20MHz.When the pin of RTL8019 was unsettled, input state was a low level, because chip pin inside has connect the pull down resistor of a 100k Ω.The AEN pin allows to enable pin for the IO port operation, and ground connection is in effectively the address always; The IOCS16B pin pulls down to ground with the resistance of a 27k Ω, and resetting is low level constantly, selects 8 mode bus; Read-write pin IORB, IOWB respectively with the RD of single-chip microcomputer, the WR pin links to each other; 8 bit data bus SD0～SD7 receive the PA mouth of single-chip microcomputer; IOSO～IOS3 selects pin for the IO base address, the unsettled 300H that is set to, thus SA5～SA7, SA10～SA19 ground connection, SA8 and SA9 connect high level, and the address wire of really using has only SA0～SA4, receives on the address wire of single-chip microcomputer; IRQS0～IRQS2 is for interrupting selecting pin, and in fact unsettled selection interrupt INT 0 is not used and interrupted, and be to use inquiry mode; The AUI pin is used for the outside MAU of AUI interface and detects, and AUI or bnc interface are used in decision, and the bnc interface mode is supported 8 line multiple twin or coaxial cables, so the RJ45 interface is used in the unsettled selection of this pin; SMEMRB and SMEMWB are the memory read/write pin, and they are connect high level; TPIN and TPOUT are the difference input and output pin; Be used for respectively receiving from twisted-pair feeder with to twisted-pair feeder and send code signal; RTL8019 links to each other with the RJ45 interface through isolating low pass filter 20F001N isolation processing; Access network based on ethernet then innerly adopts two transmission transformers, is used for transmission signals and suppress noise jamming.

Fig. 3 representes the whole block diagram of the general hardware platform system that the utility model is suitable for.Below, in conjunction with Fig. 3 the overall structure of general hardware platform is described.

General hardware platform is made up of supply module 1, keyboard input display part, control section and interface section jointly.Wherein supply module 1 provides power supply for keyboard input display part, control section and the interface section of this device, and the required power supply of system is a direct current 5V power supply.

Control section comprises the control device of general hardware platform system, and the interface section comprises the multi-functional input/output module 10 that is connected with this control device.In the control device of general hardware platform system; LPC processor module 8 is connected with the multi-functional input/output module 10 that comprises the LAN interface device that the utility model relates to through RS232 interface bus 12, RS422 bus 13 and LAN bus 14 respectively, and interconnects with external equipment through this multi-functional input/output module 10.

Keyboard input display part comprises keyboard input display unit 2 and keyboard input display unit 3.Keyboard input display unit 2 is connected with LPC processor module 8 in the control section through iic bus 11.Keyboard input display unit 3 is connected with LPC processor module 8 in the control section through iic bus 15.Keyboard

input display unit

2,3 adopts the ZLG7290 controller.ZLG7290 is a kind of IIC interface keyboard and LED driven management device, and controls such as data decoding and circulation, displacement, segment addressing are provided, and its can sample 64 buttons or transducer, monolithic can accomplish that LED shows, the repertoire of keyboard interface.

With respect to prior art, the LAN interface device hardware circuit of the general hardware platform system that the utility model relates to is few, simple in structure, easy to use.Consider the resource-constrained of general hardware platform system; Only realized the part agreement relevant with needs; Make suitable modification according to the actual requirements and improve the occasion that just can be applicable to general hardware platform system; In order to improve data transmission bauds and to carry out complicated protocol processes, can expand the data throughout that external register improves single-chip microcomputer, external register also can be used as the input and output buffering of serial port simultaneously.Make the LAN interface device of the general hardware platform system that the utility model relates to compared with prior art can avoid the unusual of signal of communication more effectively, practicality is stronger.

Claims

1. the network interface card interface arrangement of a general hardware platform system; It is connected with external equipment with the microprocessor that general hardware platform system is comprised respectively; It is characterized in that: comprise LAN interface control unit and connected LAN EBI, wherein, said LAN interface control unit is connected with said microprocessor; Adopt the RTL8019 controller, said LAN EBI is connected with said external equipment.