CN1908856A - Position restoration circuit device - Google Patents
Position restoration circuit device Download PDFInfo
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- CN1908856A CN1908856A CN 200510041382 CN200510041382A CN1908856A CN 1908856 A CN1908856 A CN 1908856A CN 200510041382 CN200510041382 CN 200510041382 CN 200510041382 A CN200510041382 A CN 200510041382A CN 1908856 A CN1908856 A CN 1908856A
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Abstract
The related reset circuit comprises: a processor, a watchdog circuit, and an enable switch between last two parts to inhibit the watchdog circuit outputting reset signal during electrifying or debugging or allow the circuit output restart signal for necessary. This invention overcomes defect in prior art.
Description
Technical field
The present invention relates to supervisory circuit in a kind of electric numerical data processing, relate in particular to the watchdog reset circuit in a kind of digital circuitry.
Background technology
In digital circuitry, generally all use the watchdog circuit operation conditions of resetting system and monitoring CPU reliably that guarantees to power on.Figure 1 shows that the watchdog reset circuit schematic diagram of prior art.The groundwork process of existing watchdog reset circuit is described below with reference to Fig. 1.Watchdog circuit comprises the house dog special chip 11 that is connected with processor 13 and is made up of the peripheral circuit that resistance, electric capacity and switch etc. constitute.House dog special chip 11 adopts MAX706 or ADM706 etc. usually.Watchdog reset circuit is mainly finished the operation of electrification reset, monitoring processor and three functions of variation of monitoring voltage.When system powers on, the reset signal of house dog special chip 11 from resetting about output RESET pin output 200ms, thus be system's realization electrification reset function.In addition, whether house dog special chip 11 can the monitoring processor program crash, require processor (for example 1.6s) at the appointed time, change the level (following this process is called " feeding dog ") of the house dog input WDI of house dog special chip 11, if the level of house dog input WDI does not change, the internal counter of house dog special chip 11 overflows, overflow pulse of WDO pin output house dog, and by peripheral circuit with this pulse feedback to the input that resets/MR pin, thereby in the reset signal of output RESET pin output that resets.Though Fig. 1 is not shown, but by the monitored voltage of Power Supply Monitoring input PFI pin input at house dog special chip 11, when this voltage is lower than predetermined voltage (for example 1.25V), in pulse of Power Supply Monitoring output PFO pin output, and by this pulse feedback of peripheral circuit to the input that resets/MR pin, thereby also, realize the function that monitoring voltage changes in the reset signal of output RESET pin output that resets.
Development along with technology, requirement to the online upgrading of digital hardware circuit is more and more, a lot of field programmable gate arrays (FPGA) also need to use processor to download, and the software of processor is also increasing, after powering on, such as comprising that to get processor initialization time of time of software, PKUNZIP, initialization processor and peripheral components thereof from master control borad also just more and more longer.At processor in the initialized time, often can't in the stipulated time of house dog, (such as 1.6s) go to feed dog, if this situation is not handled, will cause processor during initialization, to be resetted repeatedly by the house dog special chip, can finish initialization never.Therefore, need improve, make it not produce reset signal in the initialized time at processor to watchdog circuit.For example, watchdog circuit after a kind of the improvement in being the Chinese patent of CN2519335, notification number is disclosed, in the method by counter and fixed clock, behind electrification reset, count, be connected to the input that resets/MR pin with the output signal of after the schedule time of delaying time the house dog of house dog special chip being overflowed WDO, thereby begin to carry out the function of the monitoring processor operation of house dog.The shortcoming of this method is need expend a large amount of programmable logic resources to remove to realize this counter, particularly the clock frequency ratio of long and counting of Yan Shi time is higher the time, such as the clock of use 50MHz, delayed time 60 seconds, need to use the counter of 32bit, take a large amount of resources.In addition, another method is disclosed in notification number is the patent of CN2681231, in the method by utilizing the output signal that house dog is overflowed WDO to count, using house dog to overflow the WDO signal is input to WDI and feeds dog, and the feeding-dog signal by processor carries out zero clearing to counter, if processor does not have feeding-dog signal, rolling counters forward just begins to respond the reset signal of house dog special chip during to predetermined value.This method has reduced the clock of counting in essence, be equivalent to use the clock in cycle longer time (for example 1.6 seconds) to count, but Yan Shi time is long if desired, still can take some extra logical resources, such as to reach 5 minutes prolongation, need the counter of 8bit at least.
Said method also has following shortcoming: the first, and it is on-the-spot not provide an interruption to come notification processor to preserve before resetting processor; The second, in the debugging orientation problem, can't judge that it still is that other reasons causes processor reset that processor is fed resetting that dog causes; The 3rd, when debugging is not used house dog, the function that also can't forbid house dog.
Summary of the invention
Technical matters to be solved by this invention is to provide position restoration circuit device in a kind of digital circuitry, can forbid watchdog function in power up, thereby has solved the problem that the system repeatedly that caused by house dog in power up resets.
To achieve these goals, the invention provides a kind of position restoration circuit device, comprise processor and watchdog circuit, an and house dog enable switch that is connected between described processor and the watchdog circuit, it can be according to the control of described processor, forbid watchdog circuit output reset signal when not needing the watchdog circuit function in power up or debugging, and when needing the watchdog circuit function, allow described watchdog circuit when confiscating the feeding-dog signal of described processor, to export reset signal.
Described position restoration circuit device, wherein, described processor produces the described house dog enable switch of the direct control of house dog enable signal that is used to control described house dog enable switch.
Described position restoration circuit device wherein, also comprises a house dog enable register, and described processor is controlled described house dog enable switch by the value of controlling this house dog enable register.
Described position restoration circuit device, wherein, described house dog enable switch is realized by programmable logic device (PLD).
Described position restoration circuit device wherein, also comprises the programmable logic device (PLD) with counter register reset time, this reset time counter register initial value corresponding to the watchdog reset time.
Described position restoration circuit device, wherein, counter register overflowed the house dog of described watchdog circuit and counted described reset time, and described programmable logic device (PLD) is sent the indicator signal that resets to described watchdog circuit when count value reaches the initial value of described reset time of counter register, wherein said reset time counter register the count value feeding-dog signal zero clearing of sending by described processor.
Described position restoration circuit device, wherein, when the count value when being less than the 3rd value of described initial value of described reset time of register, described programmable logic device (PLD) sends look-at-me to the interruption input pin of described processor.
Described position restoration circuit device, wherein, described initial value and the 3rd value can be by described processor settings.
Described position restoration circuit device wherein, also comprises the storer that is connected to described processor, is used for the field data of the described processor of storage after described processor receives look-at-me.
Described position restoration circuit device, wherein, described house dog is overflowed and is connected to described house dog input WDI after WDO handles through described programmable logic device (PLD); Perhaps described house dog is overflowed WDO and also directly is connected with described house dog input in described programmable logic device (PLD); Perhaps described house dog is overflowed WDO and is connected at the outside and described house dog input of described programmable logic device (PLD) WDI.
Compared with prior art, according to position restoration circuit device of the present invention only needs seldom logical resource and also can realize following function:
The first, by the state of processor control house dog enable switch, the function that can forbid house dog, thereby when debugging is not used house dog and in power up, can prevent owing to processor can't be fed the system reset that dog causes.
The second, by before watchdog circuit generation reset signal, send look-at-me to processor, notification processor is preserved field data, makes to utilize the field data that is kept in the storer, locatees the reason that resets and take place more easily.
The 3rd, utilize counter register reset time, processor can change the reset time of house dog according to actual needs, thereby realizes the watchdog reset time of variable-length.Therefore when processor is inconvenient to feed dog, can prolong reset time, can take into account house dog simultaneously and software be run the promptness that flies and crash response.
Be understandable that, all be exemplary and indicative to general introduction of the present invention and following detailed explanation above, and provide claimed of the present invention further explanation.
Attendant advantages of the present invention and feature will be illustrated in the description of back, by following description, will make them apparent to a certain extent, perhaps can be familiar with them by putting into practice the present invention.These purposes of the present invention and advantage can realize by the structure of specifically noting in written description and claim and the accompanying drawing and obtain.
Description of drawings
Figure 1 shows that the watchdog reset circuit schematic diagram of prior art;
Figure 2 shows that schematic block circuit diagram according to the first embodiment of the invention position restoration circuit device;
Figure 3 shows that circuit theory diagrams according to the first embodiment position restoration circuit device of first embodiment of the invention;
Figure 4 shows that circuit theory diagrams according to the second embodiment position restoration circuit device of first embodiment of the invention;
Figure 5 shows that schematic block circuit diagram according to the second embodiment of the invention position restoration circuit device;
Figure 6 shows that circuit theory diagrams according to the position restoration circuit device of first embodiment of second embodiment of the invention; And
Figure 7 shows that circuit theory diagrams according to the position restoration circuit device of second embodiment of second embodiment of the invention.
Wherein, Reference numeral:
10: watchdog circuit;
11: the house dog special chip;
12: programmable logic device (PLD);
13: processor;
14: storer.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing and concrete embodiment.
Figure 2 shows that schematic block circuit diagram according to present first embodiment of the invention position restoration circuit device.
As shown in Figure 2, position restoration circuit device comprise watchdog circuit 10, processor 13 and have the house dog enable switch and reset time counter register programmable logic device (PLD) 12.When powering on, processor 13 makes the house dog enable switch be in off state, and programmable logic device (PLD) 12 forbids exporting the indicator signal that resets to house dog input/WR, thereby makes in power up, even processor 13 is not fed dog, watchdog circuit 10 can not send reset signal to system yet.After initialization is finished, processor 13 revise at first as required in the programmable logic device (PLD) 12 reset time counter register initial value, then with the conducting of house dog enable switch, notice programmable logic device (PLD) 12 allows watchdog functions.Therefore counter register reset time of programmable logic device (PLD) 12 begins that house dog is overflowed WDO and counts.If processor 13 is fed dog on time, the feeding-dog signal of answer processor 13 so, the zero clearing of reset counter register, thus can not import/the WR output indicator signal that resets to house dog, watchdog circuit 10 just can not produce reset signal yet.If processor 13 is fed dog within the predetermined time, reset time, counter register overflowed, and programmable logic device (PLD) 12 is exported the indicator signal that resets to house dog input/WR, and indication watchdog circuit 10 produces reset signals.
Fig. 3 shows the circuit theory diagrams according to the position restoration circuit device of first embodiment of first embodiment of the invention.Describe the principle of work of this position restoration circuit device in detail below with reference to Fig. 3.In Fig. 3, position restoration circuit device comprise watchdog circuit special chip 11 with and peripheral circuit, processor 13 and have the house dog enable switch and reset time counter register programmable logic device (PLD) 12.Wherein, house dog special chip 11 has constituted watchdog circuit with some peripheral components, but house dog special chip 11 can adopt and be not limited to MAX706 or ADM706, and peripheral components is resistance, electric capacity and the reset switch that cooperates house dog special chip 11 to use.Programmable logic device (PLD) 12 can adopt any one among CPLD, EPLD and the FPGA.In addition, programmable logic device (PLD) 12 also can adopt other circuit with said function to replace.But described processor 13 can be to be not limited to CPU, DSP or network processing unit.
The IO pin that the house dog of house dog special chip 11 input WDI, house dog are overflowed WDO, the output RESET that resets, the input that resets/MR pin are connected respectively to programmable logic device (PLD) 12.House dog is overflowed WDO and feed back to house dog input WDI after programmable logic device (PLD) 12 is handled.In addition, house dog is overflowed WDO and also can directly feed back to house dog input WDI or house dog and overflow WDO and also can be connected to house dog input WDI in programmable logic device (PLD) 12 outsides without handling.Processor 13 sends feeding-dog signal and house dog enable signal WDEN respectively to the IO of programmable logic device (PLD) 12 pin.In addition, though not shown, those of ordinary skill in the art are appreciated that if it is ternary that the house dog of processor 13 enables the original state of WDEN pin, must be fixed in a fixing level to pin by last pull down resistor.Simultaneously, in order to make programmable logic device (PLD) 12 operate as normal, the connecting line that between programmable logic device (PLD) 12 and processor 13, also is connected with address bus, data bus and transmits read-write and chip selection signal.Though not shown, can understand for those of ordinary skill in the art, can also be connected with other line between programmable logic device (PLD) 12 and the processor, be to realize the required signal of various functions with the transmission.And for having different connected modes as required between the programmable logic device (PLD) 12 of different model and the processor 13.
When powering on, the reset pulse of house dog special chip 11 about 200ms of pin RESET elder generation output, programmable logic device (PLD) 12 loading procedures simultaneously.Because the load time of CPLD or EPLD is all very short, can finish initialization in the hundreds of microsecond.Through after the resetting of watchdog circuit, processor 13 makes the house dog enable switch be in off-state by house dog enable signal WDEN, thereby forbids watchdog function.At this moment, even processor 13 is not fed dog, programmable logic device (PLD) 12 also can not exported the indicator signal that not reset to the input that the resets/MR of house dog special chip 11, thereby house dog special chip 11 just can not produce reset signal yet.
Figure 4 shows that circuit theory diagrams according to the position restoration circuit device of second embodiment of first embodiment of the invention.As shown in Figure 4, except processor 13 does not have the house dog enable register more than programmable logic device (PLD) 12 transmission house dog enable signals and programmable logic device (PLD) 12, the circuit structure of the position restoration circuit device among the circuit structure of this position restoration circuit device and Fig. 3 is substantially the same, wherein the value of house dog enable register is controlled the state of house dog enable switch, thereby forbids or allow the function of house dog.Omitted description at this to same parts.
4 describe the power up different in detail with reference to the accompanying drawings with position restoration circuit device.Because the initialization procedure of programmable logic device (PLD) 12 is very short,, the value of the house dog enable register of programmable logic device (PLD) 12 is set so after the initialization of programmable logic device (PLD) 12 was finished, the reset signal of house dog special chip 11 was still effective.Respond this value, the house dog enable switch is in off-state, thereby programmable logic device (PLD) 12 is forbidden the function of house dog.At this moment, even processor 13 is not fed dog, programmable logic device (PLD) 12 can not exported the indicator signal that resets to the input that resets/MR yet, so house dog special chip 11 just can not produce reset signal yet.After processor 13 initialization are finished, according to actual conditions revise in the programmable logic device (PLD) 12 reset time counter register initial value (promptly, the time interval is overflowed in modification, the value of overflowing time * register of the time of overflowing=house dog special chip 11), revise the value of house dog enable register then.Respond this amended value, the house dog enable switch in the programmable logic device (PLD) is in conducting state, thereby allows watchdog function.After this, if processor 13 can not be fed dog in the preset time interval, house dog special chip 11 will send reset signal to system, makes system reset.Because it is identical with the working method of position restoration circuit device shown in Figure 3 that house dog special chip 11 is carried out the concrete course of work of watchdog function, so omitted detailed description at this.
Figure 5 shows that circuit theory diagrams according to the second embodiment of the invention position restoration circuit device.With reference to Fig. 5, compare with the position restoration circuit device of first embodiment, be outside the difference that this position restoration circuit device has the informing function that resets in advance.This position restoration circuit device has the same section except that the position restoration circuit device with first embodiment, also comprise with processor 13 being connected, and programmable logic device (PLD) 12 sends look-at-me to the interruption input pin of processor 13 with the storer 14 of the field data of preservation processor 13 when processor 13 takes place to interrupt.But storer 14 can be to be not limited to static RAM (SRAM).Omitted description at this to same parts.
The work of position restoration circuit device is described below with reference to Fig. 5.Because the management of the power up and the back house dog that powers on is identical with position restoration circuit device shown in Figure 2, omit at this it is described, the working method of its prior notice function that resets is only described.
The programmable logic device (PLD) 12 of position restoration circuit device is in overflowing the process that WDO counts to house dog, when count value be less than counter register initial value reset time a value (below, this value is called the 3rd value) time, to the interruption input pin transmission look-at-me of processor 13.Described the 3rd value can dispose by the register of programmable logic device (PLD), also can determine by default value.Processor 13 enters the Interrupt Process process after receiving look-at-me, thereby the field data of processor 13 is saved in the storer.Reset time counter register count value when reaching its initial value, programmable logic device (PLD) 12 is sent the cue that resets to the input/WR that resets of watchdog circuit 10.Thereby this cue that resets of watchdog circuit 10 responses is sent reset signal by the output RESET that resets to system, makes system reset.Pass through said process, programmable logic device (PLD) 12 is before watchdog circuit 10 sends reset signal, notification processor 13 is preserved field data, therefore be owing to not feeding resetting or resetting of dog generation by being stored in processor 13 field datas in the storer, can distinguishing owing to other reason generation.Orientation problem easily in debugging.
Fig. 6 shows the circuit theory diagrams according to the position restoration circuit device of first embodiment of second embodiment of the invention.With reference to Fig. 6, this position restoration circuit device removes increases the SRAM that is connected with processor 13, outside, other parts are substantially the same with the position restoration circuit device among Fig. 3.Omitted description at this to same section.
The power up of position restoration circuit device and the back that powers on are identical with position restoration circuit device shown in Figure 3 to the management of house dog.The work of its prior notice function that resets is described below with reference to Fig. 6.The programmable logic device (PLD) 12 of position restoration circuit device is in overflowing the process that WDO counts to house dog, when count value was less than the 3rd value of counter register value reset time, programmable logic device (PLD) 12 sent look-at-me to the interruption input pin of processor 13.In the present embodiment, the 3rd value is the default value of system.Processor 13 enters the Interrupt Process process after receiving look-at-me, thereby the field data of processor 13 is saved in the storer 14.Reset time counter register count value when reaching its setting value, programmable logic device (PLD) 12 is sent the cue that resets to the input/WR that resets of house dog special chip 11.Thereby house dog special chip 11 responds the indicator signal that resets and sends reset signal by the output RESET that resets to system, makes system reset.Owing to store the field data of processor 13 in storer 14, therefore can distinguish is owing to not feeding resetting or resetting owing to other reason generation of dog generation.Orientation problem easily in debugging.
Figure 7 shows that circuit theory diagrams according to the position restoration circuit device of second embodiment of second embodiment of the invention.With reference to Fig. 7, in this position restoration circuit device, the house dog enable register is set in programmable logic device (PLD) 12 replaces sending the house dog enable signal to programmable logic device (PLD) 12 by processor 13, remainder is identical with position restoration circuit device shown in Figure 6.Therefore, omitted description to same parts.
The working method of the position restoration circuit device among the control of position restoration circuit device 7 house dog enable switch in power up and Fig. 4 is identical, and the management of the back house dog special chip 11 that powers on and the working method of the prior notice function that resets are identical with position restoration circuit device among Fig. 6.Therefore, no longer describe its course of work in detail.
Though the present invention has realized the house dog enable switch by programmable logic device (PLD) 12, those of ordinary skill in the art are appreciated that the house dog enable switch also can realize by alternate manner.
By above-mentioned explanation, compared with prior art, according to position restoration circuit device of the present invention only needs seldom logical resource and also can realize following function:
The first, by the state of processor control house dog enable switch, the function that can forbid house dog, thereby when debugging is not used house dog and in power up, can prevent owing to processor can't be fed the system reset that dog causes.
The second, by before watchdog circuit generation reset signal, send look-at-me to processor, notification processor is preserved field data, makes to utilize the field data that is kept in the storer, locatees the reason that resets and take place more easily.
The 3rd, utilize counter register reset time, processor can change the reset time of house dog according to actual needs, thereby realizes the watchdog reset time of variable-length.Therefore when processor is inconvenient to feed dog, can prolong reset time, can take into account house dog simultaneously and software be run the promptness that flies and crash response.
Obviously under the situation that does not break away from the spirit and scope of the present invention, those of ordinary skill in the art can make various modifications and variations to the present invention.Therefore, the present invention cover all fall into claims and equivalent thereof scope within improvement and modification.
Claims (10)
1, a kind of position restoration circuit device comprises processor and watchdog circuit, it is characterized in that, also comprises:
One house dog enable switch, be connected between described processor and the described watchdog circuit, and can be according to the control of described processor, forbid watchdog circuit output reset signal when not needing the watchdog circuit function in power up or debugging, and when needing the watchdog circuit function, allow described watchdog circuit when confiscating the feeding-dog signal of described processor, to export reset signal.
2, position restoration circuit device according to claim 1 is characterized in that, described processor produces the described house dog enable switch of the direct control of house dog enable signal that is used to control described house dog enable switch.
3, position restoration circuit device according to claim 1 is characterized in that, also comprises a house dog enable register, and described processor is controlled described house dog enable switch by the value of controlling this house dog enable register.
4, position restoration circuit device according to claim 1 is characterized in that, described house dog enable switch is realized by programmable logic device (PLD).
5, position restoration circuit device according to claim 1 is characterized in that, also comprises the programmable logic device (PLD) with counter register reset time, this reset time counter register initial value corresponding to the watchdog reset time.
6, position restoration circuit device according to claim 5, it is characterized in that, counter register overflowed the house dog of described watchdog circuit and counted described reset time, and described programmable logic device (PLD) is sent the indicator signal that resets to described watchdog circuit when count value reaches the initial value of described reset time of counter register, wherein said reset time counter register the count value feeding-dog signal zero clearing of sending by described processor.
7, position restoration circuit device according to claim 6 is characterized in that, when the count value when being less than the 3rd value of described initial value of described reset time of register, described programmable logic device (PLD) sends look-at-me to the interruption input pin of described processor.
8, position restoration circuit device according to claim 7 is characterized in that, described initial value and the 3rd value can be by described processor settings.
9, position restoration circuit device according to claim 7 is characterized in that, also comprises the storer that is connected to described processor, is used for the field data of the described processor of storage after described processor receives look-at-me.
10, position restoration circuit device according to claim 5 is characterized in that, described house dog is overflowed and is connected to described house dog input WDI after WDO handles through described programmable logic device (PLD); Perhaps described house dog is overflowed WDO and also directly is connected with described house dog input in described programmable logic device (PLD); Perhaps described house dog is overflowed WDO and is connected at the outside and described house dog input of described programmable logic device (PLD) WDI.
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| CNB2005100413823A CN100472400C (en) | 2005-08-05 | 2005-08-05 | Position restoration circuit device |
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| CNB2005100413823A CN100472400C (en) | 2005-08-05 | 2005-08-05 | Position restoration circuit device |
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| CN1908856A true CN1908856A (en) | 2007-02-07 |
| CN100472400C CN100472400C (en) | 2009-03-25 |
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| CNB2005100413823A Expired - Fee Related CN100472400C (en) | 2005-08-05 | 2005-08-05 | Position restoration circuit device |
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