CN1604553A

CN1604553A - A data bus transmission apparatus

Info

Publication number: CN1604553A
Application number: CN 03154478
Authority: CN
Inventors: 李慧军; 惠平; 曹松; 陈小敏; 孙辉先
Original assignee: National Space Science Center of CAS
Current assignee: National Space Science Center of CAS
Priority date: 2003-09-30
Filing date: 2003-09-30
Publication date: 2005-04-06

Abstract

This invention discloses a data bus transmission device, which comprises at least two single IEEE-1394 physical layer chips and one IEEE-1394 link layer chip. The said physical layer chips are separately connected with link layer chip and are located with path switch in its link path. It also comprises a path switch control apparatus connected with all path switches with one conducting at one time controlling path switch.

Description

A kind of data/address bus transmission equipment

Technical field

The present invention relates to a kind of data/address bus transmission equipment, in particular, relate to the transmission equipment that a kind of IEEE-1394 of use data/address bus carries out the high reliability data transmission.

Background technology

IEEE-1394 high-speed serial bus (being called for short 1394) standard, the trade mark that originates from Apple is called the high-speed serial bus standard of " Firewire ".In December nineteen ninety-five, IEEE-1394-1995 high-speed serial bus standard is adopted by the ieee standard committee and ratifies.In order further to improve and improve the service behaviour of bus, interconnected improve more and desirable that makes equipment between bus, the ieee standard committee replenishes 1394 bus standard agreements, this complementary agreement is granted in March, 2000, is named as IEEE-1394a-2000 high-speed serial bus standard.Its related content comprises: improve bandwidth utilization, bus reset, power management etc.Along with the continuous development of technology, the standard of high-speed bus standard IEEE-1394b of future generation can go through very soon, and supported Bus Speed is 800Mbps, 1.6Gbps and 3.2Gbps, and supports the different medium cable, as: plastic fiber etc.In fact, the next-generation that is operated in 800Mbps now occurs, and the equipment of 1.6Gbps also can appear on the market soon.If realized this speed, hundreds of video channels can transmit in real time by one 1394 bus.Except speed, real equity transmission also is one of key advantages of IEEE-1394.

Since the IEEE-1394 high-speed serial bus have plug and play, speed height, with low cost, be easy to superperformance such as use, at present, on many equipment, all adopt IEEE-1394 high-speed serial bus product, mainly comprised household electrical appliance, PC and built-in External memory equipment, PC ancillary equipment etc.

In addition, along with the increase of the industry spot traffic, existing fieldbus is difficult to meet the demands.IEEE-1394 might become the novel bus standard of industry spot.In the aerospace field, also have at present with IEEE-1394 as communication bus dynamically.These all are the observing and controlling environment of requirement high reliability data transmission.

And be to solve IEEE-1394 high-speed serial bus this important experiences in traditional control circuit design of not consideration redundancy when its standard is determined that PC field multimedia communication problem is invented, redundancy also is the basic principle of high reliability data transfer bus scheme.Include only a physical chip and a link layer chip (perhaps physical chip and link layer chip integrate) on existing IEEE-1394 bus transfer equipment is general, so be to adopt single cable transmission mode between the IEEE-1394 bus transfer equipment.The consequence that such structure is brought is that when the physical chip of bus itself or transmission equipment broke down, then the transfer of data of whole bus was interrupted.This is a major obstacle that at present the IEEE-1394 high speed data bus is applied in the observing and controlling environment of high reliability data transmission requirement.

Summary of the invention

The objective of the invention is in IEEE-1394 data/address bus transmission equipment, a plurality of physical chips are set,, thereby improve the reliability of IEEE-1394 bus data transmission so that realize the transfer of data of many redundant bus.

In order to realize the foregoing invention purpose, the invention provides a kind of data/address bus transmission equipment, comprise at least two independent IEEE-1394 physical chips and an IEEE-1394 link layer chip; Described at least two physical chips are connected with the link layer chip respectively, and are respectively equipped with channel selector on its connecting path; Also comprise a channel selector control device that is connected with all channel selectors, be used to control all channel selectors and have only a conducting at synchronization.

Described channel selector control device also is connected with described two physical chip at least, be used to control the pairing physical chip of the channel selector that is in off state and be in off-position, and the pairing physical chip of channel selector that control simultaneously is in channel status is in "on" position.

The present invention is by using a plurality of independent physical chips simultaneously, the redundancy feature of transfer of data is provided, solved effectively adopt this IEEE-1394 of single cable transmission mode its major obstacle of in the observing and controlling environment that requires the high reliability data transmission, using of intrinsic prevention.When the present invention breaks down in current I EEE-1394 bus, can realize the switching of physical chip and bus, make the normal communication of system restoration, improve reliability of data transmission by the switched path switch.This is to the higher field of transfer of data reliability requirement, and the system that uses in some adverse circumstances (as radiation environment) or the unattended environment (as space flight) has very large using value.

Description of drawings

Fig. 1 is the structural representation that has the IEEE-1394 data/address bus transmission equipment of dual redundant bus according to of the present invention;

Fig. 2 is the bus connecting mode of IEEE-1394 data transmission set of the present invention in an example system.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.

With reference to the highly reliable High Speed I EEE-1394 data transmission set of Fig. 1 with dual redundant bus, comprise two 1394

physical chips

1 and 2, here, can select model for use is the physical chip of TSB41LV04A.

Physical chip

1 and 2 is electrically connected by transmission/receive path (not shown) and device external bus cable (not shown), so that the transmission of deal with data and reception, guarantee normally access bus of equipment, this just provides the dual redundant bus of IEEE-1394 data transmission set to connect effectively.Each physical chip can have a plurality of transmission/receive paths.

This equipment also comprises one 1394 link layer chip, and this chip provides packet confirmation of receipt, addressing, data check and data framing etc., and here, it is the link layer chip of TSB12LV32 or TSB12LV23 that 1394 link layer chips 6 can be selected model for use.Two physical chips 1 are connected with 1394 link layer chips 6 respectively with 2, and be respectively equipped with channel selector 4 and 5 on connecting path, these two channel selectors are used to control the on off operating mode that is connected between two 1394 physical chips and the single 1394 link layer chips 6.Wherein, channel selector 4 and 5 can be selected the PI3C3245 chip for use.

Channel selector control device 3 is used to control the on off operating mode of two channel selectors 4 and 5.This channel selector control device 3 can use conventional commutation circuit, for example can constitute this commutation circuit by a TL26PF70YS relay.Come the on off operating mode of control access switch 4 and 5 by the state variation of TL26PF70YS relay, so that realize to

physical chip

1 and 2 and the switching of the bus that they were connected.By channel selector control device 3, make channel selector 4 and 5 have only one to connect at synchronization, just having only a physical chip is work at present.When the IEEE-1394 bus of the physical chip of work at present or work at present breaks down, the technical staff can switch on another physical chip so that use on the other bus by channel selector control device 3, thereby makes the normal communication of system restoration.

When IEEE-1394 data transmission set of the present invention used in the system of some adverse circumstances (as radiation environment) or unattended environment (as space flight), channel selector control device 3 was preferably remote-controlled.For example, when channel selector control device 3 comprises a relay, can comprise the switching that the remote control of a routine comes the control relay state in 3 at device, this is that those skilled in the art is known.

Simultaneously in order effectively to save power consumption, channel selector control device 3 also is used to control the power on/off state of two 1394 physical chips 1 and 2.Under the control of channel selector control device 3, when a channel selector 4 or 5 disconnects, be in off-position with the physical chip of the corresponding connection of this channel selector.And, when a channel selector 4 or 5 is in on-state, also be in "on" position with the physical chip of the corresponding connection of this channel selector.

Fig. 2 is the connected mode of IEEE-1394 data transmission set of the present invention in an example system, comprises three IEEE-1394 data transmission sets of the present invention in this example, is respectively equipment 10,20 and 30.In Fig. 2, each equipment all has structure shown in Figure 1, but for the sake of clarity, only shows the

physical chip

1 and 2 with the bus join dependency in each equipment in Fig. 2.

In Fig. 2, each physical chip of equipment 10 all is connected by bus with two physical chips of equipment 20 by two transmission/receive paths.Similarly, each physical chip of equipment 30 all is connected by bus with two physical chips of equipment 20 by two transmission/receive paths.

When 4 connections of the channel selector in each equipment and 1 energising of 1394 physical chips, can realize that this is the current default working method of circuit with reference to the effective communication that passes through bus A and C in 1394 systems of Fig. 2.

When the equipment 10 of Fig. 2 when the bus A of equipment 20 breaks down, the technical staff can be by channel selector control device 3 transmitting control commands to equipment 20, the channel selector 4 of equipment 20 is disconnected and 1 outage of 1394 physical chips, the channel selector 5 of equipment 20 is connected and 2 energisings of 1394 physical chips, then can realize with reference to the effective communication that passes through bus F and G in 1394 systems of Fig. 2, simultaneously because 1394 physical chips 1 of equipment 20 have cut off the power supply, the loop phenomenon that the IEEE-1394 communications protocol is limited can be do not occurred in this path, the operate as normal of system can be guaranteed.

Bus C to equipment 30 breaks down when the equipment 20 of Fig. 2, can be by channel selector control device 3 transmitting control commands to equipment 20, the channel selector 4 of equipment 20 is disconnected and 1 outage of 1394 physical chips, the channel selector 5 of equipment 20 is connected and 2 energisings of 1394 physical chips, then can realize in 1394 systems of Fig. 2 effective communication by bus F and G, simultaneously because 1394 physical chips 1 of equipment 20 have cut off the power supply, the loop phenomenon that the IEEE-1394 communications protocol is limited can be do not occurred in this path, the operate as normal of system can be guaranteed.

Bus C to equipment 30 breaks down when the equipment 20 of Fig. 2, and fault is not bus C itself, be 1394 physical chips 1 of equipment 30, then can be by channel selector control device 3 transmitting control commands to equipment 30, the channel selector 4 of equipment 30 is disconnected and 1 outage of 1394 physical chips, the channel selector 5 of equipment 30 is connected and 2 energisings of 1394 physical chips, then can realize with reference to the effective communication that passes through bus A and H in 1394 systems of Fig. 2, simultaneously because 1394 physical chips 1 of equipment 30 have cut off the power supply, the loop phenomenon that the IEEE-1394 communications protocol is limited can be do not occurred in this path, the operate as normal of system can be guaranteed.

Other the fault owing to physical chip and bus generation can make the communication system of IEEE-1394 data transmission set of the present invention recover effective communication by being effectively controlled as upper type, has improved the reliability of system greatly.

Though in embodiment, only use and comprise that the IEEE-1394 data transmission set of two physical chips illustrates the present invention, but be to be understood that, those skilled in the art can not make under the situation of creative work, can plural physical chip be applied in the IEEE-1394 data transmission set of the present invention according to practical application.

Claims

1, a kind of data/address bus transmission equipment comprises IEEE-1394 physical chip and IEEE-1394 link layer chip, it is characterized in that, this equipment comprises at least two independent IEEE-1394 physical chips and an IEEE-1394 link layer chip; Described at least two physical chips are connected with the link layer chip respectively, and are respectively equipped with channel selector on its connecting path; Also comprise a channel selector control device that is connected with all channel selectors, be used to control all channel selectors and have only a conducting at synchronization.

2, data/address bus transmission equipment according to claim 1, it is characterized in that, described channel selector control device also is connected with described two physical chip at least, be used to control the pairing physical chip of the channel selector that is in off state and be in off-position, and the pairing physical chip of channel selector that control simultaneously is in channel status is in "on" position.