CN105653404A - Equipment for detecting state machine clock alternation - Google Patents
Equipment for detecting state machine clock alternation Download PDFInfo
- Publication number
- CN105653404A CN105653404A CN201410729295.6A CN201410729295A CN105653404A CN 105653404 A CN105653404 A CN 105653404A CN 201410729295 A CN201410729295 A CN 201410729295A CN 105653404 A CN105653404 A CN 105653404A
- Authority
- CN
- China
- Prior art keywords
- state
- secondary status
- seasonal pulse
- machine
- state machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Manipulation Of Pulses (AREA)
Abstract
The invention provides equipment for detecting state machine clock alternation. The equipment comprises a main state machine and an auxiliary machine, wherein the main state machine is provided with a main state and is driven by main clock; the main state machine can be switched to the main state while responding to an event; the auxiliary state machine is provided with an auxiliary state and is driven by auxiliary pulse synchronizing with the main clock; the main state machine can be switched to the auxiliary state while responding to at least one signal produced by the event; and correspondence is built between the main state and the auxiliary state. Therefore, when alternated clock is continued, the correspondence between the main state and the auxiliary state is in inconformity and the main clock is shown to be altered.
Description
Technical field
The present invention relates to a kind of state machine, particularly relate to a kind of for detecting the equipment that state machine seasonal pulse is altered.
Background technology
Being known in the art the state machine implemented with electronic type, it comprises the state machine with multiple seasonal pulse or unit. For example, the 4th, 480, No. 198 United States Patent (USP)s, it discloses for increasing the device replicating seasonal pulse processing safety, or the 8th, 229, No. 111 United States Patent (USP)s, it discloses and uses at least two finite state machine unit, or the 5th, 377, No. 205 United States Patent (USP)s, it discloses the equipment with multiple state machine and multiple seasonal pulse.
Summary of the invention
The present invention provides a kind of for detecting the equipment that state machine seasonal pulse is altered.
One exemplary embodiment of the present invention is that this equipment includes for detecting the equipment that state machine seasonal pulse is altered: host state machine and secondary status machine. This host state machine has major state and is driven by main seasonal pulse, this major state changeable in response to event. These secondary status facility have secondary status and are driven by the auxiliary seasonal pulse synchronize with main seasonal pulse, this secondary status changeable in response to the signal generated at least based on this event, thus that sets up between major state with secondary status is corresponding, therefore it is connected at after altering main seasonal pulse, corresponding between major state with secondary status becomes inconsistent, thus represents main seasonal pulse and is tampered.
For the features described above of the present invention and advantage can be become apparent, special embodiment below, and coordinate accompanying drawing to be described in detail below.
Accompanying drawing explanation
In the present invention, some non-restrictive illustrative embodiment or feature illustrate in the following figures.
Identical, repetition, equivalent or similar structure, element occur in one or more of the drawings or partly generally generally utilizes same reference numerals labelling, and can without repeating label and/or description.
Previously mentioned presented element implies without quoting at its accompanying drawing occurred or explanation further.
Fig. 1 schematically illustrates the block chart of the structure according to the exemplary embodiment invented and for detecting the signal altered of state machine seasonal pulse;
Fig. 2 describes according to the exemplary embodiment invented in response to the equivalence host state machine of similar events and the state of secondary status machine and conversion between.
Description of reference numerals:
100: structure;
102: host state machine;
104: major state;
106: secondary status machine;
108: color is color;
112: checking circuit;
122: event;
114,116,124,126: arrow;
128: auxiliary signal;
222,224,226,228,246,248: transition arrow;
132: main seasonal pulse;
134: auxiliary seasonal pulse;
136: pecked line;
142: logic circuit;
144: dotted line;
210,240: figure;
212,214,216,218: state;
232: event I;
234: event II;
236: event III;
238: event IV;
242,244: secondary status.
Detailed description of the invention
In the case of unrestricted, state machine is the existing state machine in this area to present disclosure, for instance, store situation or the state of preset time, change this situation or state in response to the condition occurred or event and be likely to start the device of other actions.
It is said that in general, state machine is referred to as the device including electronic circuit and element in the present invention, but its emulation and/or simulation will not be got rid of.
For simplicity and in the case of unrestricted, the condition from a state to another State Transferring or event or any existence is caused together to be called event.
In present disclosure, host state machine refers to and may operate to carry out the main of groundwork or kernel state machine, and secondary status machine refer to can together with host state machine operation for verifying or test the state machine of host state machine operation.
For clarity and brevity, normal pulse major state when the time normal pulse state of host state machine is also called main. Similarly, the time normal pulse state of secondary status machine is also called normal pulse secondary status during auxiliary, and secondary status is also referred to as " color (color) ".
In present disclosure, in the case of unrestricted, seasonal pulse drive state machine refer to its state or state value arrange by clock signal keep or gating (strobbed) or latch state machine; It is to say, when event causes from a state to the conversion of next state, next state is held up to by clock signal till there is another conversion.
In present disclosure, with reference to device is synchronization with another device and/or operation means actually to synchronize simultaneously or while operation, although be likely to be due to the different permissible deviations of element and/or the factor such as inherent delay and/or time change without complete exactly simultaneous generation.
In present disclosure, the seasonal pulse altering state machine means disable or cut seasonal pulse conductor or destroy seasonal pulse by any technology of this area, but that, unless otherwise stated, the seasonal pulse altering state machine also means that state machine at least relative to the trouble or failure of its seasonal pulse.
Above-cited term is also represented by its deformation and conjugate.
Altering of the main seasonal pulse of a host state machine that technical problem is that detection seasonal pulse driving solved by the invention.
A technical solution according to the present invention is that host state machine adds secondary status machine, and this secondary status machine is driven by optionally independent auxiliary seasonal pulse, and wherein this auxiliary seasonal pulse is Tong Bu with main seasonal pulse. This secondary status machine is configured to respond together with host state machine one biconditional operation and to the event of host state machine, and its method is to change secondary status by the conversion synchronization with host state machine. The transition response of secondary status machine is in the auxiliary signal generated by logic circuit, and at least in certain embodiments, logic circuit considers the state of host state machine.
Host state machine and secondary status machine are arranged such that the state of host state machine and the secondary status of secondary status machine or color correspond to each other or match each other.
Therefore, when the main seasonal pulse of host state machine is tampered, before main seasonal pulse is tampered, host state machine is maintained at last state.
But, auxiliary seasonal pulse remains on, and still operable secondary status machine in response to auxiliary signal, uses change color. Therefore, corresponding between last state of host state machine with current color cannot remain unchanged, in indicating that main seasonal pulse breaks down.
In order to detect and warn the destruction of main seasonal pulse to operate, designed and be configured to the circuit (being also referred to as checking circuit) of checking major state and the coupling of color and or be connected on host state machine and secondary status machine together with host state machine and secondary status chain knot. Checking circuit is perceived major state and color and/or can obtain major state and color, and identifies color and do not correspond to major state or situation unmatched with major state, and can this result be warned, in indicating that altering of main seasonal pulse. This warning can be any suitable form or technology, for instance, by the electronic signal specified or audible signal or light emitting diode (LED) light or by trigger action etc.
Therefore, the combination of host state machine and secondary status machine and/or combination and the link with checking circuit provide for detecting and at least optionally notifying altering of main seasonal pulse.
It should be noted, although the seasonal pulse for altering circuit is well known in the art technology, but it is increasingly difficult and complicated for altering two seasonal pulse, additionally, we are also without wishing to producing extra seasonal pulse.
What should also be noted that between major state with color corresponding is not necessarily one to one in itself. For example, the correspondence of one-to-many, two of which or two or more major state are mapped to a color or corresponding to a color.
In certain embodiments, in order to be further ensured that the detection altered of main seasonal pulse, multiple secondary status machines can combine with host state machine, even if so that winner's seasonal pulse and auxiliary seasonal pulse are tampered, so one or more extra secondary status machines and one or more auxiliary seasonal pulse still continuous service, and the detection altered such as this main seasonal pulse above and notice can be carried out.
One potential technology effect of the present invention is for detecting and the altering or the simple device of fault of alarm state machine seasonal pulse, thus avoiding the circuit of complexity.
Appear herein below the substantially non-limiting general introduction putting into practice the present invention. This summarises the illustrative practice of embodiments of the invention, thus the structure foundation of embodiment that is that provide change and/or that substitute and/or that disperse.
Fig. 1 schematically illustrates the block chart of the structure 100 according to the exemplary embodiment invented and for detecting the signal that state machine seasonal pulse is altered.
There is the host state machine 102 of major state 104 and there is color 108 operate together as described hereinafter as the secondary status machine 106 of secondary status.
As illustrated by arrow 124, host state machine receives event (such as, event 122). Event 122 realizes the conversion of host state machine 102, and additionally as 144 schematically illustrated by a dotted line, provides logic circuit 142 by major state 104, and this logic circuit 142 produces to provide the auxiliary signal 128 of secondary status machine 106 based on major state 104. In response to auxiliary signal 128, the conversion of secondary status machine 106 and host state machine 102 switches color simultaneously.
It should be noted that the conversion of the conversion of host state machine 102 and secondary status machine 106 not necessarily can change major state 104 and/or color 108 respectively.Therefore, host state machine 102 and/or secondary status machine 106 can be switched to or be effectively held in current major state 104 and/or color 108 respectively.
Should also be noted that in some embodiments or situation, logic circuit 142 is it is not intended that major state, no matter so that major state 104, auxiliary signal 128 can trigger the conversion of secondary status machine 106.
Major state 104 and color 108 are strobed or latch, or arrange respectively through main seasonal pulse 132 and auxiliary seasonal pulse 134, and wherein main seasonal pulse 132 and auxiliary seasonal pulse 134 carry out synchronizing (as schematically shown) by pecked line 136. In certain embodiments, main seasonal pulse 132 and auxiliary seasonal pulse 134 are independently of each other. Or, in certain embodiments, main seasonal pulse 132 is driven by identical timing circuit with auxiliary seasonal pulse 134.
Owing to the conversion of host state machine 102 and secondary status machine 106 realizes respectively through event 122 and auxiliary signal 128 simultaneously, and owing to major state 104 and color 108 are arranged respectively through the main seasonal pulse 132 synchronized and auxiliary seasonal pulse 134, between major state 104 with color 108, therefore there is corresponding or dependency.
When main seasonal pulse 132 is changed into and does not run (such as, owing to altering and/or fault and/or inefficacy), host state machine 102 is maintained at last major state 104. But, the secondary status machine 106 with independent and unrelated with host state machine 102 auxiliary seasonal pulse 134 operates in response to event 122. Therefore, finally, the corresponding or dependency between major state 104 with color 108 becomes inconsistent or uncorrelated, thus representing and at least breaking down relative to the host state machine 102 of main seasonal pulse 132.
Checking circuit 112 through composition to check that major state 104 and color 108 are whether corresponding to each other, and at least optionally, uncorrelated or inconsistent to startup alarm time corresponding when occurring between major state 104 with color 108. Therefore, checking circuit 112 is connected to host state machine 102 and secondary status machine 106, and can obtain the major state 104 and color 108 that are represented respectively by arrow 114 and arrow 116.
Therefore, by means of example, it is assumed that major state 104 is in " state A " and should be switched to " state B " in response to event 122, and correspondingly, color 108 is " green " color and should be switched to " blueness " color in response to event 122.
Therefore, when main seasonal pulse 132 is tampered, destroyed and host state machine 102 the major state 104 of the switching of host state machine 102 rests on " state A ", and event 122 is responded and color 108 is by assisting seasonal pulse 134 to be set to " blueness " by secondary status machine 106 simultaneously. Therefore, the dependency of major state 104 and color 108 is destroyed.
Owing to checking circuit 112 detects or identifies the false correlations of major state 104 and color 108, therefore in certain embodiments, checking circuit 112 is configured to starting operation (such as, generating alarm). For example, HONGGUANG is opened, and when major state 104 and color 108 are corresponding to, time each other, optionally opening green glow; Or, for example, checking circuit 112 can through composition to reset host state machine and/or otherwise to affect host state machine 102 to disable the extraction of data (such as, confidential data).
In certain embodiments, major state 104 and the secondary status existing mode in this area as color 108 are implemented. Such as, by representing the flip-flop array of data bit, wherein the number of element or data bit represent that major state 104 and the secondary status as color 108 are not necessarily identical.
Should also be noted that major state 104 is not likely to be man-to-man relation with the corresponding of color 108 or dependency, but can essentially be one-to-many or many-to-one correspondence at least in part.
Therefore, by means of example, the major state 104 as " state A " and " state B " can correspond to " blueness " color, and the major state 104 as " state C " can correspond to " green " color.
When major state 104 and color 108 be not with when fully correspondence is relative to each other one to one, until the destruction of final main seasonal pulse is by before verifying that circuit 112 identifies, in fact it could happen that multiple conversions of secondary status machine 106.
The synchronization of main seasonal pulse 132 and auxiliary seasonal pulse 134 can be performed by the technology of this area. For example, the separate clocking circuit with equivalent crystal is used, so that winner's seasonal pulse 132 and auxiliary seasonal pulse 134 are independently of each other; Or for example, drive main seasonal pulse 132 and auxiliary seasonal pulse 134 from identical time signal source.
It should be noted that color is symbolically for the secondary status of its correspondence, to be further elucidated with the difference between major state 104 and secondary status.
It should also be noted that, host state machine 102 is configured to the part in large scale system or device and operates as the part in large scale system or device, this large scale system or device are such as the security systems controlled by host state machine 102, so that providing the destruction of detection host state machine 102 and making a response (such as, disabling host state machine 102) by adequate measures.
In certain embodiments, checking circuit 112 includes in host state machine 102 and/or secondary status machine 106.
In certain embodiments, as and/or be similar to multiple secondary status machines of secondary status machine 106 and operate together with host state machine 102 in response to auxiliary signal 128, so that when as and/or be similar to the auxiliary seasonal pulse of auxiliary seasonal pulse 134 or when secondary status machine is also tampered or does not run, remaining secondary status machine can such as the fault of this detection host state machine 102 above. Likewise it is possible to implement multiple logic circuit 142. Therefore, there is unnecessary secondary status machine and at least potentially add the reliability altered detecting its host state machine 102 and/or the main seasonal pulse 132 of seasonal pulse.
Exemplary embodiment according to invention, Fig. 2 illustrates in response to the equivalence host state machine of similar events and the state of secondary status machine and conversion between by means of the simplified example being similar to structure 100.
Figure 21 0 describes four major states and the conversion of the host state machine in response to event. Major state is expressed as: " state A ", is expressed as state 212; " state B ", is expressed as state 214; " state C ", is expressed as state 216; And " state D ", it is expressed as state 218.
In response to the event similar with event 122, major state switches betwixt. In response to event I (being expressed as event 232), host state machine is switched to " state B " (as illustrated in transition arrow 222) from " state A "; In response to event II (being expressed as event 234), host state machine is switched to " state C " (as illustrated in transition arrow 224) from " state B "; In response to event III (being expressed as event 236), host state machine is switched to " state D " (as illustrated in transition arrow 226) from " state C "; And in response to event IV (being expressed as event 238), host state machine switches back to " state A " (as illustrated in transition arrow 228) from " state D ".
Figure 24 0 illustrates two secondary statuss and the conversion of the secondary status machine in response to the auxiliary signal similar with auxiliary signal 128, and this auxiliary signal corresponds to or is effectively equivalent to similar events, i.e. be equivalent to event I, event II, event III and event IV. Therefore, in order to simplify, the auxiliary signal that the logic circuit similar with logic circuit 142 produces is not dependent on the state of host state machine, for instance, event is re-introduced into auxiliary signal.
Secondary status is by being expressed as " black " color of secondary status 242 and being expressed as " white " color representation of secondary status 244.
Therefore, in response to event I or event III, " black " color is switched to " white " color (as illustrated by transition arrow 246), and in response to event II or event IV, " white " color is switched to " black " color (as illustrated by transition arrow 248).
Correspondingly, " state A " and " state C " corresponds to " black " color in two pairs of correspondences, and " state B " and " state D " corresponds to " white " color in two pairs of correspondences.
According to Figure 21 0 and Figure 24 0 and reference configuration 100, when following condition (1) and condition (2) are effective, will not identify or represent altering of main seasonal pulse; Otherwise when being unsatisfactory for condition (1) or condition (2), it is possible to represent and identify altering or destroying of main seasonal pulse.
(color==" black ") && ((major state==" state A ") II (major state==" state C ")) (1) (color==" white ") && ((major state==" state B ") II (major state==" state D ")) (2)
Above-mentioned condition formulates according to C programming language.
Obviously, it is necessary at least 2 bits represent four major states, and need at least one bit to represent two secondary statuss (being similar to even-odd check).
Correspondence compared to multiple conversions of host state machine and major state with two colors illustrated such as top, secondary status machine is configured and/or constructs in certain embodiments, so that each conversion of host state machine and secondary status machine is switched to different unique color, what hence set up between major state with secondary status is corresponding.
In certain embodiments, as noted above, what occur between major state with color is middle corresponding, for instance, 6 major states can correspond to 3 colors.
Therefore providing a kind of equipment altered for detecting state machine seasonal pulse according to the present invention, this equipment includes: host state machine and secondary status machine. This host state machine is had major state and is driven by main seasonal pulse, and in response to event this major state changeable; These secondary status facility are had secondary status and are driven by the auxiliary seasonal pulse synchronize with main seasonal pulse, and in response to the signal generated at least based on this event this secondary status changeable, thus that sets up between major state with secondary status is corresponding, therefore continue after altering main seasonal pulse, corresponding between major state with secondary status becomes inconsistent, thus represents main seasonal pulse and is tampered.
In certain embodiments, after being tampered at main seasonal pulse, what finally violate between major state with secondary status is corresponding, and corresponding between major state with secondary status becomes inconsistent.
In certain embodiments, this equipment farther includes checking circuit, and this checking circuit is configured to inconsistent corresponding with between secondary status of detection major state.
In certain embodiments, this checking circuit is configured to respond to detection major state and inconsistent corresponding between secondary status and starting operation.
In certain embodiments, this action includes perceptible alarm.
In certain embodiments, this action includes affecting host state machine.
In certain embodiments, this equipment farther includes multiple secondary status machine, therefore increases the reliability altered detecting main seasonal pulse when assisting seasonal pulse to be tampered.
The term " configuration " used herein for an object and/or " employing " or its change mean by design for obtaining in the way of target and/or mechanism uses element.
Term as used herein should be interpreted as restrictive, unless otherwise indicated, and term as used herein be only for describe specific embodiment purpose, and be not intended to restriction invented. Although having illustrated and described certain embodiments of the present invention, but it is clear that the invention is not restricted to this embodiment herein. It is not precluded from many amendments, change, change, substitute and equivalent.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit; Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (7)
1. one kind is used for detecting the equipment that state machine seasonal pulse is altered, it is characterised in that this equipment includes:
Host state machine, this host state machine is had major state and is driven by main seasonal pulse, this major state changeable in response to event; And
At least one secondary status machine, these secondary status facility are had secondary status and are driven by the auxiliary seasonal pulse Tong Bu with this main seasonal pulse, this secondary status changeable in response to the signal generated at least based on this event, thus that sets up between this major state with this secondary status is corresponding
Therefore continuing after altering this main seasonal pulse, this between this major state with this secondary status is corresponding becomes inconsistent, thus represents this main seasonal pulse and is tampered.
2. equipment according to claim 1, it is characterised in that due to after this main seasonal pulse is tampered, finally violates this between this major state with this secondary status corresponding, and this between this major state with this secondary status is corresponding becomes inconsistent.
3. equipment according to claim 1, it is characterised in that also include:
Checking circuit, it is inconsistent corresponding that this checking circuit is configured to detect between this major state with this secondary status.
4. equipment according to claim 3, it is characterised in that this checking circuit is configured to respond to detect inconsistent corresponding of this between this major state with this secondary status and starts an action.
5. equipment according to claim 4, it is characterised in that this action includes perceptible alarm.
6. equipment according to claim 4, it is characterised in that this action includes affecting this host state machine.
7. equipment according to claim 1, it is characterised in that also include:
Multiple secondary status machines, therefore increase the reliability altered detecting this main seasonal pulse when this auxiliary seasonal pulse is tampered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729295.6A CN105653404B (en) | 2014-12-04 | 2014-12-04 | The equipment altered for detecting state machine clock pulse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729295.6A CN105653404B (en) | 2014-12-04 | 2014-12-04 | The equipment altered for detecting state machine clock pulse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105653404A true CN105653404A (en) | 2016-06-08 |
| CN105653404B CN105653404B (en) | 2018-11-30 |
Family
ID=56481410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410729295.6A Active CN105653404B (en) | 2014-12-04 | 2014-12-04 | The equipment altered for detecting state machine clock pulse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105653404B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5551017A (en) * | 1993-04-26 | 1996-08-27 | Apple Computer, Inc. | Polycyclic timing and apparatus for pipelined computer operation |
| CN101553785A (en) * | 2006-12-08 | 2009-10-07 | 吴灿炜 | State machine and system and method of implementing a state machine |
| CN101609308A (en) * | 2008-06-20 | 2009-12-23 | 中国科学院沈阳自动化研究所 | Industrial intelligent terminal based on RFID data acquisition function and control method thereof |
| CN102737208A (en) * | 2011-04-14 | 2012-10-17 | 北京中电华大电子设计有限责任公司 | Method for decoding MMC type data by ultrahigh frequency electronic tag |
-
2014
- 2014-12-04 CN CN201410729295.6A patent/CN105653404B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5551017A (en) * | 1993-04-26 | 1996-08-27 | Apple Computer, Inc. | Polycyclic timing and apparatus for pipelined computer operation |
| CN101553785A (en) * | 2006-12-08 | 2009-10-07 | 吴灿炜 | State machine and system and method of implementing a state machine |
| CN101609308A (en) * | 2008-06-20 | 2009-12-23 | 中国科学院沈阳自动化研究所 | Industrial intelligent terminal based on RFID data acquisition function and control method thereof |
| CN102737208A (en) * | 2011-04-14 | 2012-10-17 | 北京中电华大电子设计有限责任公司 | Method for decoding MMC type data by ultrahigh frequency electronic tag |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105653404B (en) | 2018-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3892954A (en) | Programmable, tester for protection and safeguards logic functions | |
| CN106572047A (en) | Physical network safety device and control method thereof | |
| CN103995768A (en) | Visual quick diagnosing method of server faults | |
| US20150042162A1 (en) | Integrated drive motor power interface | |
| CN105974879A (en) | Redundancy control equipment of digital instrument control system, digital instrument control system and control method | |
| CN106354685A (en) | Method for realizing I2C bus deadlock recovery of PSU and ME communication | |
| CN103744774A (en) | Server fault visualizing and rapid diagnosing method | |
| CN106742001A (en) | A kind of airborne alarm control lamp box and the light alarm method with it | |
| CN108008624A (en) | Rob power logic control element | |
| US20150370624A1 (en) | Information processing apparatus and fault diagnosis method | |
| CN103809429B (en) | Hardware mediation hybrid redundancy intelligent controller and redundancy backup method | |
| CN104503947A (en) | Multi-server and signal processing method thereof | |
| CN202217034U (en) | Single plate fault detector | |
| CN105653404A (en) | Equipment for detecting state machine clock alternation | |
| CN103593275A (en) | Disk information displaying method and device | |
| JP6140094B2 (en) | Matrix type key input interface | |
| CN202583865U (en) | Dual-redundancy control circuit | |
| US8831912B2 (en) | Checking of functions of a control system having components | |
| TWI526804B (en) | State-machine clock tampering detection | |
| CN103137227A (en) | Software common mode failure detection system of nuclear power station security level DCS and control method thereof | |
| US9223960B1 (en) | State-machine clock tampering detection | |
| JP4726866B2 (en) | Signal light control device | |
| CN204143541U (en) | ATM service keyboard | |
| CN107632782A (en) | A kind of BMC code protection methods and device based on ARM whole machine cabinet server nodes | |
| CN103310520A (en) | Intelligent electronic coded lock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |