CN101378267A - Primary and secondary switching device, and switching method using the same - Google Patents
Primary and secondary switching device, and switching method using the same Download PDFInfo
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- CN101378267A CN101378267A CNA2007100766646A CN200710076664A CN101378267A CN 101378267 A CN101378267 A CN 101378267A CN A2007100766646 A CNA2007100766646 A CN A2007100766646A CN 200710076664 A CN200710076664 A CN 200710076664A CN 101378267 A CN101378267 A CN 101378267A
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Abstract
The invention relates to a main/backup switching device and a method for carrying out main/backup switching by using the device; the device comprises a backboard and a reciprocal main/backup structure, a component, a first single plate and a second single plate with the completely same logic circuit; the first single plate is provided with a programmable logic device, a central processing unit and a peripheral circuit, intercommunication between the programmable logic device and the central processing unit is realized by a local bus; the input signals of the programmable logic device comprise: MS_IN, CL_IN, MS_HAND, SYS_DEF and CPU_WDI; the output signals comprise: MS_OUT and CL_OUT; the MS_OUT and CL_OUT output by the first single plate are respectively used as the MS_IN and CL_IN of the second single plate after passing through the backboard so as to be input into the second single plate; the MS_OUT and CL_OUT output by the second single plate are respectively used as the MS_IN and CL_IN of the first single plate after passing through the backboard so as to be input into the first single plate. The technical proposal of the invention occupies less backboard interconnection signals and reliably realizes the main/backup switching.
Description
Technical field
The present invention relates to a kind of active and standby switching device shifter and use this device to carry out the method for active and standby switching.
Background technology
Communications network system equipment is very high to the requirement of reliability, in order to improve the reliability of system, usually crucial veneer is adopted the working method of activestandby hot backup.The single board interface signal output of main usefulness is enabled state in system, i.e. real-time online work; And the output of standby single board interface signal is the disable state in system.The interface signal of two boards on backboard multiple connection together, when the veneer of main usefulness broke down, system should be able to automatically switch, and guaranteed the reliability of system works.
Existing active and standby technical situation is as described below:
1, adopt rest-set flip-flop to realize the interlocking of simple hardware activestandby state, behind the active and standby switching command of side initiation, the opposing party in a disguised form should change state at once, is 02261600 and is called the patent of " active and standby plate switching device shifter " as the patent No..Its problem is: in the veneer plug or when external interference is arranged, cause unusual active and standby switching even main and standby competition the situation of unlimited vibration to occur easily, thereby cause the fault of system.On this basis, application number is 03113177.8 and is called to propose in the patent application of " a kind of active and standby plate changeover apparatus and reverse method thereof " to remove the method for shaking on the circuit adding uneven filter on the active and standby signal of input.Its problem is: the sampling number of uneven filter is determined according to the groove position information of veneer, when on plug veneer or the active and standby signal interference being arranged, final decision who be main usefulness, determined by groove position information fully, cause former master to become standby probably, thereby unusual the switching taken place with veneer;
2, the patent No. is 99229246.8 and is called the patent of " the active and standby plate switching mode of a kind of electrical communication system ", its problem is: because mainboard can't effectively detect the standby board state, no matter whether can operate as normal to plate, whether on software and hardware, all set switch, all can initiate the masterslave switchover flow process, the active and standby switching of this moment causes system to be absorbed in malfunction probably.And, in the process of plug veneer, may come off prior to the activestandby state pin/then contact plate signal on the throne in the activestandby state pin, cause extracting/insert veneer to think by mistake the board status appearance unusual, main using will oneself be changed to, because the interlocking mechanism of activestandby state, at this moment former master may become standby with veneer, whole system is broken down.
3, for solving the plug standby board to main influence with veneer, adopted main method in the active and standby technology that has with locking, promptly as long as in case this plate obtains main using, no matter to the plate what state, as long as this plate does not break down, just the locking master uses state, be 01121975.0 and be called the patent of " master and stand-by circuits switching equipment and method thereof " as the patent No., it can guarantee in normal plug process, main and standby relation can not take place unusually, but, be not seated at veneer, occur loosening in the work, occur on the backboard under the situation such as interference signal, then two veneers all can enter the main state of using probably, and after veneer contacts good again or disturbs disappearance, only otherwise plug or Reset Board, two veneers can keep two major states, probably device are caused nonvolatil damage.
4, for accomplishing not occur unusual masterslave switchover, the patent No. is 01130715.3 and is called to have realized a kind of method of carrying out activestandby state control by the serial order interface mode in the patent of " masterslave switchover control circuit and implementation method ", complicated in the realization, and all operations all needs by software control, in case the master is broken down with board software, the long period interruption may appear in system.The patent No. is the ID signal that proposes in 98118143.0 patents that are called " active/standby changeover apparatus " by being provided with on the motherboard, the decision master uses, standby board, but, when certain piece veneer breaks down, can't Autonomous Control by main standby with switching into, simultaneously another piece veneer changes into main usefulness by standby at once, and interrupting appears in the system that can make.
5, for improving system reliability; application number is 200310111916 and is called that the patent application of " a kind of main standby switching control method that is used for communication equipment " has proposed standby board and resetted and mainly initiate the function of masterslave switchover with veneer or standby board; but work is done inadequately to reset and protection; may under the plug veneer or the situation that is interfered unusual active and standby switching and main situation with board resetting take place.
6, for realizing reliable active and standby switching, very many active and standby interconnected signals have been introduced in the design that has on backboard, as: the main and standby competition signal, the masterslave switchover signal, main and standby boards power on signal, active and standby fault-signal, software arrangements is finished signal, house dog spill over etc.Raising along with board integration, it is precious all the more that backboard cabling resource seems, the veneer that particularly adopts active and standby mechanism mostly is to be in control, switching center's position veneer, and this problem seems more outstanding, simultaneously, too much interface signal makes the reliability of hardware descend to some extent.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of a small amount of backplane interconnect signal that takies, and reliably realizes the active and standby switching device shifter of active and standby switching and uses this device to carry out the method for active and standby switching.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of active and standby switching device shifter, comprise backboard and active and standby each other first veneer and second veneer, described first veneer is provided with programmable logic device, central processing unit and the peripheral circuit that is connected with reset signal, described programmable logic device and described central processing unit are by the local bus two-way communication, and the logic input signal of described programmable logic device comprises:
To board status index signal (MS_IN) with to plate command signal (CL_IN), be used to judge that this plate reaches the situation on the throne to plate;
Manual active and standby switching signal (MS_HAND), single plate hardware working state signal (SYS_DEF) are the output signal of described peripheral circuit, as the input signal of described programmable logic device;
The hardware feeding-dog signal (CPU_WDI) of central processing unit is the output signal of described central processing unit, as the input signal of described programmable logic device, is used for the protection to central processing unit operation exception state;
The logic output signal of described programmable logic device comprises:
This board status index signal (MS_OUT) is used for to plate is indicated this board status;
This plate command signal (CL_OUT) is used for to plate being sent order or making and replying;
The structure of described second veneer, components and parts, logical circuit and described first veneer are identical;
This board status index signal (MS_OUT) of the programmable logic device of described first veneer output and this plate command signal (CL_OUT) by described backboard after respectively as described second veneer to board status index signal (MS_IN) and plate command signal (CL_IN) is imported the programmable logic device of described second veneer; This board status index signal (MS_OUT) of the programmable logic device of described second veneer output and this plate command signal (CL_OUT) by described backboard after respectively as described first veneer to board status index signal (MS_IN) and plate command signal (CL_IN) is imported the programmable logic device of described first veneer.
In the such scheme, the described programmable logic device of described first veneer and second veneer comprises activestandby state order detection module, this plate operating state detection module, central processing unit interface module, activestandby state demanded storage module, activestandby state decision-making module, output interface module and clock module; Described activestandby state order detection module receives describedly judges this plate and to the situation on the throne of plate, of living in active and standby with state and to plate order indication situation to plate, its output is connected to described activestandby state decision-making module to board status index signal (MS_IN) with to plate command signal (CL_IN); Described plate operating state detection module receives the hardware feeding-dog signal (CPU_WDI) and the reset signal of described single plate hardware working state signal (SYS_DEF), manual active and standby switching signal (MS_HAND), central processing unit, and its output is connected to described activestandby state decision-making module and activestandby state demanded storage module; Described central processing unit interface module is by local bus and described central processing unit two-way communication, described activestandby state demanded storage module respectively with described central processing unit interface module, activestandby state decision-making module, output interface module two-way communication, the output of described activestandby state decision-making module is connected to described output interface module, and described output interface module is exported described programmable logic device with described board status index signal (MS_OUT) and this plate command signal (CL_OUT).
In the such scheme, described first veneer and second veneer to board status index signal (MS_IN) and drop-down at described plate to plate command signal (CL_IN), this board status index signal (MS_OUT) and this plate command signal (CL_OUT) of described first veneer and second veneer are drawn on described backboard, make this board status index signal (MS_OUT) of described first veneer and second veneer and this plate command signal (CL_OUT) when not exporting, described first veneer and second veneer be output as high level to board status index signal (MS_IN) with to plate command signal (CL_IN).
A kind of method of using above-mentioned active and standby switching device shifter to carry out active and standby switching, described first veneer and second Board Power up reset and are definite active and standby with behind the state, and when mainboard received switching command initiation switching, described active and standby switching may further comprise the steps:
4.1 judge whether slave board is on the throne, if do not exist, finish active and standby switching flow and carry out active and standby the determining of state of using, otherwise, enter step 4.2;
4.2 described mainboard judges to plate whether be state standby and working properly by described mainboard to board status index signal (MS_IN), if abnormal work state, finish active and standby switching flow and enter plate abnormality handling process, otherwise, step 4.3 entered;
4.3 described mainboard sends active and standby switching warning order by this plate command signal (CL_OUT) of described mainboard, slave board is received described active and standby switching warning order by described slave board to plate command signal (CL_IN), after carrying out the preparation of active and standby switching, be changed to this board status index signal (MS_OUT) of described slave board standby and be ready to switching state; Described mainboard wait for described mainboard to board status index signal (MS_IN) transfer to standby and be ready to switching state after enter step 4.4;
4.4 described mainboard sends active and standby switching command by this plate command signal (CL_OUT) of described mainboard, described slave board by described slave board plate command signal (CL_IN) is received described active and standby switching command after, this board status index signal (MS_OUT) of described slave board is changed to the main state of using, and described mainboard switches to stand-by state from main with state then.
In the such scheme, judge veneer whether on the throne be by plate decision rule on the throne, described veneer decision rule on the throne comprises:
The decision rule on the throne to plate is:
This plate is main when use state, described plate be the signal that is equal to or higher than predeterminated frequency to board status index signal (MS_IN);
When this plate was stand-by state, described plate board status index signal (MS_IN) is reached was the signal that is equal to or higher than predeterminated frequency to plate command signal (CL_IN);
This plate decision rule on the throne is:
A plate plate on the throne or described board status index signal (MS_IN) is reached is high level to plate command signal (CL_IN).
In the such scheme, the electrification reset activestandby state of described first veneer and second veneer is defined as resetting by Board Power up, and flow process realizes, the described Board Power up flow process that resets comprises:
The back keeps the off-line lock-out state in Preset Time 6.1 Board Power up resets;
6.2 described veneer judges to board status index signal (MS_IN) with to plate command signal (CL_IN) whether this plate is on the throne by described, if on the throne, then according to the customization time-delay of plate position, otherwise, get back to step 6.1;
6.3 through after the described time-delay, judge whether described veneer is in the off-line lock-out state, if described veneer has been in non-off-line lock-out state, then described veneer determines that its active and standby this board status index signal (MS_OUT) and this plate command signal (CL_OUT) with state and described veneer sends corresponding signal, otherwise described veneer continues to keep off-line lock-out state and repeating step 6.3.
In the such scheme, the active and standby of described first veneer and second veneer determines that with state flow process determines by active and standby with state, describedly active and standbyly determines that with state flow process is correspondingly processed according to plate judged result on the throne:
When this plate is not on the throne: in default the timing period, this plate is locked as off-line state to the judgement time of board status index signal (MS_IN) greater than this plate, after the described timing period end, the situation on the throne of inquiring about this plate again;
This plate is on the throne, and to plate when not on the throne: this plate is set to the main state of use, and the output of this plate is this board status index signal (MS_OUT) and this plate command signal (CL_OUT) accordingly;
This plate is on the throne, to plate when on the throne: according to this plate board status index signal (MS_IN) is determined state to plate, if described be mainly use state to plate, then this plate is a stand-by state, otherwise, this plate is changed to the state of using of leading.
In the such scheme, described is the mainboard flow process to plate abnormality handling process, comprising:
8.1 after complaining to warning, send by this plate command signal (CL_OUT) of described mainboard and to reset to partitioned signal;
8.1 whether judge on the thronely to plate, if on the throne, this plate command signal (CL_OUT) of described mainboard, otherwise this plate command signal (CL_OUT) of described mainboard stops to send and resets to partitioned signal if continuing to send described resetting to partitioned signal.
In the such scheme, described is the slave board flow process to plate abnormality handling process, comprising:
9.1 after complaining to warning, described slave board is according to indication or preset mode, whether decision resets to plate;
9.2 if do not reset to plate, then finish described to plate abnormality handling process, otherwise enable the output of described slave board, this board status index signal (MS_OUT) of described slave board is changed to main usefulness, send by this plate command signal (CL_OUT) of described slave board simultaneously and reset partitioned signal;
9.3 whether judge on the thronely to plate, if on the throne, this plate command signal (CL_OUT) of described slave board, otherwise this plate command signal (CL_OUT) of described slave board stops to send and resets to partitioned signal if continuing to send described resetting to partitioned signal.
In the such scheme, if described mainboard or the single plate hardware working state signal (SYS_DEF) of slave board, the hardware feeding-dog signal (CPU_WDI) of central processing unit are abnormality, described mainboard or slave board enter this plate abnormality handling process; Wherein,
When mainboard was this plate, this plate abnormality handling process may further comprise the steps:
10.1.1 after complaining to warning, this board status index signal (MS_OUT) of described plate is changed to main using and the operation irregularity state;
10.1.2 whether judge on the thronely and working properly to plate, if on the throne and working properly to plate, a then described plate sends active and standby switching command, otherwise, get back to step 10.1.1;
When slave board was this plate, this plate abnormality handling process may further comprise the steps:
10.2.1 after complaining to warning, this board status index signal (MS_OUT) of described plate is changed to standby and the operation irregularity state;
10.2.2 according to whether reset this plate or this plate placed off-line state of preset mode decision.
No matter this plate is to lead usefulness or standby, and unusual when the hardware feeding-dog signal (CPU_WDI) of central processing unit, this plate then directly resets.
The beneficial effect of technical scheme provided by the invention mainly shows the following aspects:
1, the information of intercommunication is very abundant between the main and standby boards: comprise to the plate activestandby state, to plate state on the throne, to plate operating state etc., for providing reliable reference frame to plate being sent operational order;
2, to the strict monitoring of this intralamellar part information, comprise this plate state on the throne, this plate activestandby state, this plate operating state etc., provide reliable reference frame for determining the active and standby working method of this plate;
3, all this plate and to board status information can carry out alternately, and reliable and flexible and changeable control strategy is provided;
4, the interconnected signal of backplane active/standby is very simple, only needs two pairs can finish all states and command interaction function;
5, force control to combine hardware Autonomous Control and software, reliable and stable active and standby switching and fault protecting method is provided;
6, programmable logic device and software cooperate, have flexible design, adaptability strong, be easy to characteristics such as upgrading.
Description of drawings
Fig. 1 is the structural representation of active and standby switching device shifter of the present invention;
Fig. 2 is a structure and performance of programmable logic device schematic diagram in the active and standby switching device shifter of the present invention;
Fig. 3 method flow diagram that described active and standby switching device shifter carries out active and standby switching for the present invention uses.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
With reference to Fig. 1, a kind of active and standby switching device shifter, comprise backboard 115 and active and standby each other first veneer 114 and second veneer 119, first veneer 114 is provided with PLD (the Programable Logic Device that is connected with RESET (resetting) signal, programmable logic device) 112 CPU (Central Processing Unit,, central processing unit) 111 and peripheral circuit 113, PLD112 and CPU111 are by Local Bus (local bus) two-way communication, and the logic input signal of PLD112 comprises:
To board status index signal MS_IN with to plate command signal CL_IN, be used to judge that this plate reaches the situation on the throne to plate;
Manual active and standby switching signal MS_HAND, single plate hardware working state signal SYS_DEF, be the output signal of peripheral circuit, as the input signal of PLD112, SYS_DEF is that index such as the voltage, clock, temperature of main chip detects and collects the synthetic condition indicative signal in back;
The hardware feeding-dog signal CPU_WDI of CPU is for the output feeding-dog signal of CPU, as the input signal of PLD112, be used for protection to this plate CPU abnormality, surpass a period of time when saltus step not taking place when detecting this signal, promptly CPU occurs when unusual, and this plate directly resets; It is worked with hardware watchdog, realizes the duplicate protection of system reliability, can not increase the burden of system simultaneously;
The logic output signal of PLD112 comprises:
This board status index signal MS_OUT, be used for to plate is indicated this board status, MS_OUT has 5 kinds of states indications: main with and state working properly, main with and operation irregularity state, standby and state working properly, standby and be ready to switching state, standby and operation irregularity state; MS_OUT adopts the signal of one group of different frequency to represent the residing different conditions of veneer, and the frequency of selecting for use is high more, and the response speed of system is also just fast more, but too high frequency may be disturbed other signal, can choose as the case may be;
This plate command signal CL_OUT is used for to plate being sent order or making and replying; Generally speaking, only the CL_OUT by mainboard is used for sending various command to slave board, as reset, switch etc., slave board is then constantly monitored corresponding with it CL_IN, and makes corresponding operating, and the CL_OUT of slave board output low level pulse where necessary is as replying; The same with the MS_OUT signal, the CL_OUT signal also is to represent different command with the signal of one group of different frequency, and this class frequency can be identical with MS_OUT; CL_OUT has 4 kinds of states: active and standby switching warning order, active and standby switching command, to sheet reset order, free time.After slave board is received active and standby switching command, switch to the master and use state, and in the pulse of CL_OUT output low level; Mainboard when receiving the trailing edge of CL_IN, is changed to stand-by state with this plate after entering active and standby switching state;
The structure of second veneer 119, components and parts, logical circuit and first veneer 114 are identical;
The PLD117 that the MS_OUT of the PLD112 of first veneer 114 output and CL_OUT import second veneer 119 as the MS_IN and the CL_IN of second veneer 119 respectively after by backboard 115; The PLD112 that the MS_OUT of the PLD117 of second veneer 119 output and CL_OUT import first veneer 114 as the MS_IN and the CL_IN of first veneer 114 respectively after by backboard 115; Wherein, the MS_IN and the CL_IN of first veneer 114 and second veneer 119 are drop-down at this plate, the MS_OUT and the CL_OUT of first veneer 114 and second veneer 119 draw on backboard 115, when the MS_OUT of the win veneer 114 and second veneer 119 and CL_OUT were not exported, the MS_IN and the CL_IN of first veneer 114 and second veneer 119 were output as high level.MS_IN is in the drop-down benefit of this plate with CL_IN: no matter be that the backboard contact pin does not contact, or hardware problem causes MS_IN or the floating sky of CL_IN input pin, MS_IN and CL_IN are in the off-line lock-out state at the drop-down veneer that can make of backboard.
The structure of PLD112 and PLD117 comprises activestandby state order detection module 202, this plate operating state detection module 203, cpu i/f module 204, activestandby state demanded storage module 205, activestandby state decision-making module 206, output interface module 207 and clock module 201 respectively as shown in Figure 2; Activestandby state order detection module 202 receives that MS_IN and CL_IN judge this plate and to the situation on the throne of plate, of living in active and standby with state and to plate order indication situation to plate, its output is connected to activestandby state decision-making module 206; This plate operating state detection module 203 receives SYS_DEF, MS_HAND, CPU_WDI and RESET signal, and its output is connected to activestandby state decision-making module 206 and activestandby state demanded storage module 205; Cpu i/f module 204 is by Local Bus and CPU two-way communication, activestandby state demanded storage module 205 respectively with cpu i/f module 204, activestandby state decision-making module 206, output interface module 207 two-way communications, the output of activestandby state decision-making module 206 is connected to output interface module 207, and output interface module 207 is exported this PLD with MS_OUT and CL_OUT; Wherein,
Clock module 201: producing provides the required clock of other module, timer signal;
Activestandby state order detection module 202 has three functions:
A, judge the residing active and standby situation of using of plate according to MS_IN;
B, judge this plate jointly and to the situation on the throne of plate according to MS_IN and CL_IN;
C, monitoring are from the command situation to plate.
This plate operating state detection module 203 has two functions:
A, receive this plate fault detection signal, masterslave switchover signal, reset signal, carry out necessary filtering, prevent that glitch or wrong report from causing misoperation;
B, whether overtime not to judging to the CPU_WDI signal is used for system protection;
Cpu i/f module 204 has two functions:
A, be used for the receiving software command word,, and meet default form, then command word is write the activestandby state command register if send to active/standby changeover apparatus;
B, current plate of inquiry and to the state of plate;
Activestandby state demanded storage module 205 has 3 functions:
A, deposit the software command word;
B, deposit the running status of software;
C, deposit this plate and to board status information;
Activestandby state decision-making module 206: according to this plate, to board status information, this plate order, to the plate order determines the activestandby state information and the command information of this plate;
Output interface module 207: convert the activestandby state information and the command information of this plate to default specific waveforms.
Use in the process of above-mentioned active and standby switching device shifter, the plug mainboard must switch to stand-by state with mainboard and extract earlier by the mode of manual or consistency operation if desired; Slave board is locked into off-line state and robs the generation of primal problem to avoid slave board in the plug process.
With reference to Fig. 3, the method for using above-mentioned active and standby switching device shifter to carry out active and standby switching, first veneer 114 and second veneer, 119 electrification resets are also definite active and standby with behind the state, and when mainboard received switching command initiation switching, active and standby switching may further comprise the steps:
Step 1: judge whether slave board is on the throne,, finish active and standby switching flow and carry out active and standby the determining of state of using if do not exist, otherwise, enter step 2;
Step 2: this mainboard judges to plate whether be state standby and working properly by its MS_IN, if the abnormal work state finishes active and standby switching flow and enters plate abnormality handling process, otherwise, enter step 3;
Step 3: this mainboard sends active and standby switching warning order by its CL_OUT, and slave board is received active and standby switching warning order by its CL_IN, carry out the preparation of active and standby switching after, be changed to its MS_OUT standby and be ready to switching state; This mainboard wait for its MS_IN transfer to standby and be ready to switching state after enter step 4;
Step 4: this mainboard sends active and standby switching command by its CL_OUT, after slave board is received active and standby switching command by its CL_IN, its MS_OUT is changed to the main state of using, enable all outputs, on its CL_OUT, send a low pulse simultaneously, this mainboard is used for from the CL_IN of slave board saltus step from high to low, switches to stand-by state from main with state.
In the said method, judge veneer whether on the throne be by plate decision rule on the throne, veneer decision rule on the throne comprises:
The decision rule on the throne to plate is:
This plate is to lead when using state, and the MS_IN of this plate is the signal that is equal to or higher than predeterminated frequency;
When this plate was stand-by state, MS_IN of this plate and CL_IN were the signal that is equal to or higher than predeterminated frequency;
This plate decision rule on the throne is:
MS_IN and CL_IN on the throne to plate or this plate are high level.
And the electrification reset activestandby state of first veneer 114 and second veneer 119 is defined as resetting by Board Power up that flow process realizes, the Board Power up flow process that resets comprises:
1, in Preset Time, keeps the off-line lock-out state after Board Power up resets;
2, this veneer judges by MS_IN and CL_IN whether this plate is on the throne, if on the throne, then according to the customization time-delay of plate position, otherwise, get back to previous step;
3, through after the described time-delay, judge whether this veneer is in the off-line lock-out state, if veneer has been in non-off-line lock-out state, then this veneer determines that its active and standby MS_OUT and CL_OUT with state and veneer sends corresponding signal, otherwise this veneer continues to keep off-line lock-out state duplicate step of laying equal stress on.
Set described Preset Time according to system performance, veneer should be finished reliably to contact also with socket and reach steady-working state on the electric property in this time; Do not occur active and standby unusual competition conflict when guaranteeing that two veneers power on simultaneously, veneer is provided with different powering on to and allows main and standby competition to wait for time-delay according to groove position, place information.
That determines first veneer 114 and second veneer 119 active and standbyly needs determine flow process by active and standby with state with state, active and standbyly determines that with state flow process is correspondingly processed according to plate judged result on the throne:
When this plate is not on the throne: in the timing period of the judgement time of default MS_IN greater than this plate, this plate is locked as off-line state, after regularly the period finishes, the situation on the throne of inquiring about this plate again;
This plate is on the throne, and to plate when not on the throne: this plate is set to the main state of use, and this plate is exported corresponding M S_OUT and CL_OUT;
This plate is on the throne, and to plate when on the throne: determining state to plate according to the MS_IN of this plate, is mainly use state to plate, and then this plate is a stand-by state, otherwise, this plate is changed to the state of using of leading.
Plate abnormality handling process is comprised mainboard flow process and two kinds of situations of slave board flow process;
The mainboard flow process comprises:
1, complain to warning after, the CL_OUT by this mainboard sends and resets to partitioned signal;
2, whether judgement is on the throne to plate, if on the throne, the CL_OUT of this mainboard continues transmission and resets to partitioned signal, otherwise the CL_OUT of this mainboard stops transmission and resets to partitioned signal;
The slave board flow process comprises:
1, complain to warning after, this slave board according to the indication or preset mode, the decision whether reset to plate;
2, if do not reset to plate, then finish plate abnormality handling process, otherwise enable this slave board output, the MS_OUT of this slave board is changed to main usefulness, send by its CL_OUT simultaneously and reset partitioned signal;
3, whether judgement is on the throne to plate, if on the throne, the CL_OUT of this slave board continues transmission and resets to partitioned signal, otherwise the CL_OUT of this slave board stops transmission and resets to partitioned signal.
If SYS_DEF, the CPU_WDI of mainboard or slave board are abnormality, then this mainboard or slave board enter this plate abnormality handling process; Wherein,
When mainboard was this plate, this plate abnormality handling process may further comprise the steps:
1, complain to warning after, the MS_OUT of this this plate be changed to main with and the operation irregularity state;
2, whether judgement is on the throne and working properly to plate, if on the throne and working properly to plate, then this this plate sends active and standby switching command, otherwise, get back to the step previous step;
When slave board was this plate, this plate abnormality handling process may further comprise the steps:
1, complain to warning after, the MS_OUT of this this plate is changed to standby and the operation irregularity state;
2, according to whether reset this plate or this plate placed off-line state of preset mode decision.
No matter this plate is to lead usefulness or standby, and unusual when the hardware feeding-dog signal (CPU_WDI) of central processing unit, this plate then directly resets.
Claims (10)
1, a kind of active and standby switching device shifter comprises backboard and active and standby each other first veneer and second veneer, it is characterized in that:
Described first veneer is provided with programmable logic device, central processing unit and the peripheral circuit that is connected with reset signal, described programmable logic device and described central processing unit are by the local bus two-way communication, and the logic input signal of described programmable logic device comprises:
To board status index signal (MS_IN) with to plate command signal (CL_IN), be used to judge that this plate reaches the situation on the throne to plate;
Manual active and standby switching signal (MS_HAND), single plate hardware working state signal (SYS_DEF) are the output signal of described peripheral circuit, as the input signal of described programmable logic device;
The hardware feeding-dog signal (CPU_WDI) of central processing unit is the output signal of described central processing unit, as the input signal of described programmable logic device, is used for the protection to this plate central processing unit operation exception state;
The logic output signal of described programmable logic device comprises:
This board status index signal (MS_OUT) is used for to plate is indicated this board status;
This plate command signal (CL_OUT) is used for to plate being sent order or making and replying;
The structure of described second veneer, components and parts, logical circuit and described first veneer are identical;
This board status index signal (MS_OUT) of the programmable logic device of described first veneer output and this plate command signal (CL_OUT) by described backboard after respectively as described second veneer to board status index signal (MS_IN) and plate command signal (CL_IN) is imported the programmable logic device of described second veneer; This board status index signal (MS_OUT) of the programmable logic device of described second veneer output and this plate command signal (CL_OUT) by described backboard after respectively as described first veneer to board status index signal (MS_IN) and plate command signal (CL_IN) is imported the programmable logic device of described first veneer.
2, active and standby switching device shifter as claimed in claim 1 is characterized in that: the described programmable logic device of described first veneer and second veneer comprises activestandby state order detection module, this plate operating state detection module, central processing unit interface module, activestandby state demanded storage module, activestandby state decision-making module, output interface module and clock module; Described activestandby state order detection module receives describedly judges this plate and to the situation on the throne of plate, of living in active and standby with state and to plate order indication situation to plate, its output is connected to described activestandby state decision-making module to board status index signal (MS_IN) with to plate command signal (CL_IN); Described plate operating state detection module receives the hardware feeding-dog signal (CPU_WDI) and the reset signal of described single plate hardware working state signal (SYS_DEF), manual active and standby switching signal (MS_HAND), central processing unit, and its output is connected to described activestandby state decision-making module and activestandby state demanded storage module; Described central processing unit interface module is by local bus and described central processing unit two-way communication, described activestandby state demanded storage module respectively with described central processing unit interface module, activestandby state decision-making module, output interface module two-way communication, the output of described activestandby state decision-making module is connected to described output interface module, and described output interface module is exported described programmable logic device with described board status index signal (MS_OUT) and this plate command signal (CL_OUT).
3, active and standby switching device shifter as claimed in claim 2, it is characterized in that: described first veneer and second veneer to board status index signal (MS_IN) and drop-down at described plate to plate command signal (CL_IN), this board status index signal (MS_OUT) and this plate command signal (CL_OUT) of described first veneer and second veneer are drawn on described backboard, make this board status index signal (MS_OUT) of described first veneer and second veneer and this plate command signal (CL_OUT) when not exporting, described first veneer and second veneer be output as high level to board status index signal (MS_IN) with to plate command signal (CL_IN).
4, a kind ofly use active and standby switching device shifter as claimed in claim 1 to carry out the method for active and standby switching, it is characterized in that: described first veneer and second Board Power up reset and determine active and standby with behind the state, when mainboard received switching command initiation switching, described active and standby switching may further comprise the steps:
4.1 judge whether slave board is on the throne, if do not exist, finish active and standby switching flow and carry out active and standby the determining of state of using, otherwise, enter step 4.2;
4.2 described mainboard judges to plate whether be state standby and working properly by described mainboard to board status index signal (MS_IN), if abnormal work state, finish active and standby switching flow and enter plate abnormality handling process, otherwise, step 4.3 entered;
4.3 described mainboard sends active and standby switching warning order by this plate command signal (CL_OUT) of described mainboard, slave board is received described active and standby switching warning order by described slave board to plate command signal (CL_IN), after carrying out the preparation of active and standby switching, be changed to this board status index signal (MS_OUT) of described slave board standby and be ready to switching state; Described mainboard wait for described mainboard to board status index signal (MS_IN) transfer to standby and be ready to switching state after enter step 4.4;
4.4 described mainboard sends active and standby switching command by this plate command signal (CL_OUT) of described mainboard, described slave board by described slave board plate command signal (CL_IN) is received described active and standby switching command after, this board status index signal (MS_OUT) of described slave board is changed to the main state of using, and described mainboard switches to stand-by state from main with state then.
5, method of carrying out active and standby switching as claimed in claim 4 is characterized in that: judge veneer whether on the throne be by plate decision rule on the throne, described veneer decision rule on the throne comprises:
The decision rule on the throne to plate is:
This plate is main when use state, described plate be the signal that is equal to or higher than predeterminated frequency to board status index signal (MS_IN);
When this plate was stand-by state, described plate board status index signal (MS_IN) is reached was the signal that is equal to or higher than predeterminated frequency to plate command signal (CL_IN);
This plate decision rule on the throne is:
A plate plate on the throne or described board status index signal (MS_IN) is reached is high level to plate command signal (CL_IN).
6, as claim 4 or 5 described methods of carrying out active and standby switching, it is characterized in that: the electrification reset activestandby state of described first veneer and second veneer is defined as resetting by Board Power up, and flow process realizes, the described Board Power up flow process that resets comprises:
The back keeps the off-line lock-out state in Preset Time 6.1 Board Power up resets;
6.2 described veneer judges to board status index signal (MS_IN) with to plate command signal (CL_IN) whether this plate is on the throne by described, if on the throne, then according to the customization time-delay of plate position, otherwise, get back to step 6.1;
6.3 through after the described time-delay, judge whether described veneer is in the off-line lock-out state, if described veneer has been in non-off-line lock-out state, then described veneer determines that its active and standby this board status index signal (MS_OUT) and this plate command signal (CL_OUT) with state and described veneer sends corresponding signal, otherwise described veneer continues to keep off-line lock-out state and repeating step 6.3.
7, method of carrying out active and standby switching as claimed in claim 6, it is characterized in that: the active and standby of described first veneer and second veneer determines that with state flow process determines by active and standby with state, describedly active and standbyly determines that with state flow process is correspondingly processed according to plate judged result on the throne:
When this plate is not on the throne: in default the timing period, this plate is locked as off-line state to the judgement time of board status index signal (MS_IN) greater than this plate, after the described timing period end, the situation on the throne of inquiring about this plate again;
This plate is on the throne, and to plate when not on the throne: this plate is set to the main state of use, and the output of this plate is this board status index signal (MS_OUT) and this plate command signal (CL_OUT) accordingly;
This plate is on the throne, to plate when on the throne: according to this plate board status index signal (MS_IN) is determined state to plate, if described be mainly use state to plate, then this plate is a stand-by state, otherwise, this plate is changed to the state of using of leading.
8, method of carrying out active and standby switching as claimed in claim 4 is characterized in that: described is the mainboard flow process to plate abnormality handling process, comprising:
8.1 after complaining to warning, send by this plate command signal (CL_OUT) of described mainboard and to reset to partitioned signal;
8.1 whether judge on the thronely to plate, if on the throne, this plate command signal (CL_OUT) of described mainboard, otherwise this plate command signal (CL_OUT) of described mainboard stops to send and resets to partitioned signal if continuing to send described resetting to partitioned signal.
9, method of carrying out active and standby switching as claimed in claim 4 is characterized in that: described is the slave board flow process to plate abnormality handling process, comprising:
9.1 after complaining to warning, described slave board is according to indication or preset mode, whether decision resets to plate;
9.2 if do not reset to plate, then finish described to plate abnormality handling process, otherwise enable the output of described slave board, this board status index signal (MS_OUT) of described slave board is changed to main usefulness, send by this plate command signal (CL_OUT) of described slave board simultaneously and reset partitioned signal;
9.3 whether judge on the thronely to plate, if on the throne, this plate command signal (CL_OUT) of described slave board, otherwise this plate command signal (CL_OUT) of described slave board stops to send and resets to partitioned signal if continuing to send described resetting to partitioned signal.
10, method of carrying out active and standby switching as claimed in claim 4, it is characterized in that: if the hardware feeding-dog signal (CPU_WDI) of the single plate hardware working state signal (SYS_DEF) of described mainboard or slave board, central processing unit is abnormality, described mainboard or slave board enter this plate abnormality handling process; Wherein,
When mainboard was this plate, this plate abnormality handling process may further comprise the steps:
10.1.1 after complaining to warning, this board status index signal (MS_OUT) of described plate is changed to main using and the operation irregularity state;
10.1.2 whether judge on the thronely and working properly to plate, if on the throne and working properly to plate, a then described plate sends active and standby switching command, otherwise, get back to step 10.1.1;
When slave board was this plate, this plate abnormality handling process may further comprise the steps:
10.2.1 after complaining to warning, this board status index signal (MS_OUT) of described plate is changed to standby and the operation irregularity state;
10.2.2 according to whether reset this plate or this plate placed off-line state of preset mode decision;
No matter this plate is to lead usefulness or standby, and unusual when the hardware feeding-dog signal (CPU_WDI) of central processing unit, this plate then directly resets.
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| CN2007100766646A CN101378267B (en) | 2007-08-31 | 2007-08-31 | Primary and secondary switching device, and switching method using the same |
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|---|---|---|---|
| CN2007100766646A CN101378267B (en) | 2007-08-31 | 2007-08-31 | Primary and secondary switching device, and switching method using the same |
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| CN101378267A true CN101378267A (en) | 2009-03-04 |
| CN101378267B CN101378267B (en) | 2011-12-28 |
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