CN108711440A - Write-protect circuit and Write-protection method, write protector and electrical equipment - Google Patents
Write-protect circuit and Write-protection method, write protector and electrical equipment Download PDFInfo
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- CN108711440A CN108711440A CN201810870889.7A CN201810870889A CN108711440A CN 108711440 A CN108711440 A CN 108711440A CN 201810870889 A CN201810870889 A CN 201810870889A CN 108711440 A CN108711440 A CN 108711440A
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- write
- protect
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- 230000001012 protector Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000005611 electricity Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/24—Memory cell safety or protection circuits, e.g. arrangements for preventing inadvertent reading or writing; Status cells; Test cells
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- Read Only Memory (AREA)
Abstract
A kind of write-protect circuit and Write-protection method of disclosure offer, write protector and electrical equipment.Write-protect circuit includes switching sub-circuit, is configured as, according to the first drive signal, the write-protect port of chip being electrically connected with first voltage end, so that the level of write-protect port is pulled low to the first level so that the chip enters write state.The disclosure is accordingly controlled by the level of the write-protect port to chip, can quickly change the working condition of chip.
Description
Technical field
This disclosure relates to control field, more particularly to a kind of write-protect circuit and Write-protection method, write protector and electricity
Device equipment.
Background technology
By the write-protect (Write Protect, the abbreviation that control chip：WP) the level height of port, can be to chip
Writing protection function controlled.
Invention content
Inventors discovered through research that at present to the write-protect port of chip without extra process, typically directly under
It is pulled to low level, or is pulled to high level.If being directly pulled down to low level, Data within the chip is easy to be tampered, to
Lead to equipment operation exception.If directly pull-up is high level, when needing that data are written into chip, removal is needed to be provided
High level, which increase the complexities of operation.
For this purpose, the disclosure provide it is a kind of can be to scheme that chip write-protect state is switched fast.
According to the one side of one or more other embodiments of the present disclosure, a kind of write-protect circuit is provided, including：Switching
Circuit is configured as, according to the first drive signal, the write-protect port of chip being electrically connected with first voltage end, so as to will be described
The level of write-protect port is pulled low to the first level.
In some embodiments, switching sub-circuit is additionally configured to, according to the second drive signal, disconnect the write-protect end
Mouth is electrically connected with the first voltage end.
In some embodiments, write-protect circuit further include pull-up sub-circuit, be configured as the write-protect port with
In the case that the first voltage end disconnects, the level of the write-protect port is pulled up to second electrical level, wherein described
First level is less than the second electrical level.
In some embodiments, the pull-up sub-circuit includes pull-up resistor and second voltage end, the pull-up resistor
First end is electrically connected with the second voltage end, and the second end of the pull-up resistor is electrically connected with the write-protect port.
In some embodiments, the switching sub-circuit includes：First switch device is configured as driving according to described first
Dynamic signal enters conducting state, is additionally configured to enter off state according to second drive signal；Second switch device, quilt
It is configured in the case where the first switch device is in the conduction state, by the write-protect port and the first voltage end
Electrical connection, be additionally configured in the case where the first switch device enters off state, disconnect the write-protect port with
The electrical connection at the first voltage end.
In some embodiments, the first switch device is switching transistor；The second switch device is relay.
In some embodiments, the relay is configured as the case where the switching transistor enters conducting state
Under, relay coil obtains electric, relay normally open switch closure so that the write-protect port is electrically connected with the first voltage end
It connects；It is additionally configured in the case where the switching transistor enters off state, relay coil dead electricity, relay normally open is opened
Shutdown is opened so that the write-protect port is disconnected with the first voltage end.
In some embodiments, the switching transistor includes first electrode, second electrode and third electrode, and described first
Electrode is electrically connected for receiving the first drive signal or the second drive signal, the second electrode and one end of the relay coil
It connects, the third electrode is electrically connected with the first voltage end；The other end of the relay coil is electrically connected with tertiary voltage end
It connects；One end of the relay normally open switch is electrically connected with the first voltage end, the other end of the relay normally open switch
It is electrically connected with the write-protect port.
In some embodiments, the first voltage end is ground terminal.
According to the other side of one or more other embodiments of the present disclosure, a kind of write protector is provided, including above-mentioned
The write-protect circuit that any embodiment is related to.
In some embodiments, write protector further includes controller, is configured as carrying out write operation to chip
In the case of, send the first drive signal to the write-protect circuit.
In some embodiments, the controller is additionally configured to after said write operates, to the write-protect
Circuit sends the second drive signal.
According to the other side of one or more other embodiments of the present disclosure, a kind of electrical equipment is provided, including：It is such as above-mentioned
The write protector that any embodiment is related to.
According to the other side of one or more other embodiments of the present disclosure, a kind of Write-protection method is provided, including：It receives
First drive signal；According to first drive signal, the write-protect port of chip is electrically connected with first voltage end, to incite somebody to action
The level of the write-protect port is pulled low to the first level.
In some embodiments, the above method further includes：Receive the second drive signal；According to second drive signal,
The write-protect port and the first voltage end are electrically connected disconnection；Using second voltage end by the write-protect port
Level is pulled up to second electrical level, wherein first level is less than the second electrical level.
By referring to the drawings to the detailed description of the exemplary embodiment of the disclosure, the other feature of the disclosure and its
Advantage will become apparent.
Description of the drawings
In order to illustrate more clearly of the embodiment of the present disclosure or technical solution in the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some disclosed embodiments without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is the exemplary block diagram of the write-protect circuit of an embodiment of the present disclosure；
Fig. 2 is the exemplary block diagram of the write-protect circuit of the disclosure another embodiment；
Fig. 3 is the exemplary block diagram of the write-protect circuit of the disclosure another embodiment；
Fig. 4 is the exemplary block diagram of the write protector of an embodiment of the present disclosure；
Fig. 5 is the exemplary block diagram of the write protector of the disclosure another embodiment；
Fig. 6 is the exemplary block diagram of the write-protect circuit of the disclosure another embodiment；
Fig. 7 is the exemplary process diagram of the Write-protection method of an embodiment of the present disclosure.
Specific implementation mode
Below in conjunction with the attached drawing in the embodiment of the present disclosure, the technical solution in the embodiment of the present disclosure is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only disclosure a part of the embodiment, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment is illustrative, is never used as to the disclosure and its application or makes
Any restrictions.Based on the embodiment in the disclosure, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment belongs to the range of disclosure protection.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
Up to the unlimited the scope of the present disclosure processed of formula and numerical value.
Simultaneously, it should be appreciated that for ease of description, the size of attached various pieces shown in the drawings is not according to reality
Proportionate relationship draw.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
In shown here and discussion all examples, any occurrence should be construed as merely illustrative, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it need not be further discussed in subsequent attached drawing in a attached drawing.
Fig. 1 is the exemplary block diagram of the write-protect circuit of an embodiment of the present disclosure.As shown in Figure 1, write-protect circuit 1 wraps
Include switching sub-circuit 11.
Switching sub-circuit 11 is configured as according to the first drive signal, by the write-protect port of chip and first voltage end electricity
Connection, so that the level of write-protect port is pulled low to the first level so that chip enters write state.
In some embodiments, first voltage end is ground terminal.
In the write-protect circuit that disclosure above-described embodiment provides, carried out by the level of the write-protect port to chip
Corresponding control, can quickly change the working condition of chip.
Fig. 2 is the exemplary block diagram of the write-protect circuit of the disclosure another embodiment.The difference of Fig. 2 and Fig. 1 exists
In in the embodiment depicted in figure 2, write-protect circuit 1 further includes pull-up sub-circuit 12.
Switching sub-circuit 11 is additionally configured to, according to the second drive signal, disconnect the electricity of write-protect port and first voltage end
Connection.
Pull-up sub-circuit 12 is configured as in the case where write-protect port and first voltage end disconnect, by write-protect
The level of port is pulled up to second electrical level so that chip enters write-protect state, wherein the first level is less than second electrical level.
Fig. 3 is the exemplary block diagram of the write-protect circuit of the disclosure another embodiment.As shown in figure 3, switching sub-circuit
11 include first switch device Q and second switch device K.
First switch device Q is configured as entering conducting state according to the first drive signal, is additionally configured to according to second
Drive signal enters off state.
Second switch device K is configured as in the case where first switch device Q is in the conduction state, by write-protect port
WP is electrically connected with first voltage end, is additionally configured in the case where first switch device Q enters off state, and write-protect is disconnected
Port WP is electrically connected with first voltage end.
In some embodiments, first switch device is switching transistor or other can be switched according to drive signal
The switchgear of turn-on and turn-off state.For example, first switch device can be bipolar transistor or field-effect transistor.
In some embodiments, second switch device is relay, optocoupler or other switching write-protect port WP and the
The equipment of one voltage end status of electrically connecting.
In some embodiments, as shown in figure 3, pull-up sub-circuit 12 includes pull-up resistor R and second voltage end, pull-up electricity
The first end of resistance R is electrically connected with second voltage end, and the second end of pull-up resistor R is electrically connected with write-protect port WP.It is writing as a result,
In the case that protection port WP is disconnected with first voltage end, the level of write-protect port WP can be pulled up to second electrical level,
So that chip enters write-protect state.
In some embodiments, as shown in figure 3, relay K is configured as entering the feelings of conducting state in switching transistor Q
Under condition, relay coil K1 obtains electric, relay normally open switch K2 closures so that write-protect port WP is electrically connected with first voltage end
It connects.Relay K is additionally configured in the case where switching transistor Q enters off state, relay coil K1 dead electricity, relay
Normal open switch K2 is disconnected so that write-protect port WP is disconnected with first voltage end.
As shown in figure 3, switching transistor Q includes first electrode Q1, second electrode Q2 and third electrode Q3.First electrode Q1
It is electrically connected with one end of relay coil K1 for receiving the first drive signal or the second drive signal, second electrode Q2, third
Electrode Q3 is electrically connected with first voltage end.The other end of relay coil K2 is electrically connected with tertiary voltage end.Relay normally open is opened
The one end for closing K2 is electrically connected with first voltage end, and the other end of relay normally open switch K2 is electrically connected with write-protect port WP.
Fig. 4 is the exemplary block diagram of the write protector of an embodiment of the present disclosure.As shown in figure 4, write protector 2 wraps
Include write-protect circuit 21.Write-protect circuit 21 is the write-protect circuit that any embodiment is related in Fig. 1 to Fig. 3.By using writing
Protection circuit excessively accordingly controls the level of the write-protect port of chip, can quickly change the working condition of chip.
Fig. 5 is the exemplary block diagram of the write protector of the disclosure another embodiment.Compared with embodiment illustrated in fig. 4,
In the embodiment shown in fig. 5, write protector further includes controller 22.
Controller 22 is configured as in the case where carrying out write operation to chip, and sending first to write-protect circuit 21 drives
Dynamic signal.
In some embodiments, controller 22 is additionally configured to after write operation, is sent to write-protect circuit 21
Second drive signal.
For example, controller 22 sends the first drive signal when carrying out write operation to chip, to write-protect circuit 21.It writes
The write-protect port WP of chip is electrically connected by protection circuit 21 with ground terminal, and chip enters write mode at this time.Controller 22 exists
After write operation, the second drive signal is sent to write-protect circuit 21.Write-protect circuit 21 is by the write-protect port of chip
WP is disconnected with ground terminal, and the level of the write-protect port WP of chip is pulled up to second electrical level, to make chip enter
Write-protect state.
Fig. 6 is the exemplary block diagram of the write-protect circuit of the disclosure another embodiment.As shown in fig. 6, controller is DSP
Digital signal processor, chip are storage chip.Controller is connected by the data line interface SDA of data line interface SDAA and chip
It connects, controller is connected by clock interface SCLA with the clock interface SCL of chip.
In some embodiments, controller sends the first driving letter when carrying out write operation to chip to transistor Q
Number.Transistor Q is connected after receiving the first drive signal, and the coil of relay K has electric current to pass through, and relay normally open is caused to be opened
It closes and closes, to which the write-protect port WP of chip to be electrically connected with first voltage end.Since first voltage end is ground terminal, to
The write-protect port WP of chip is low level at this time, and chip enters write mode.
In further embodiments, controller sends the second drive signal after the completion of write operation to transistor Q.It is brilliant
Body pipe Q is turned off after receiving the second drive signal, and the coil of relay K does not have electric current to pass through, and relay normally open is caused to switch
Shutdown, to disconnect chip write-protect port WP and first voltage end electricity connection.Second voltage end is by resistance R at this time,
The level of the write-protect port WP of chip is pulled up to second electrical level.Since second electrical level is high level, to make chip enter
Write-protect state.
The disclosure also provides a kind of electrical equipment, has as any embodiment is related in fig. 4 to fig. 6 in the electrical equipment
Write-protect circuit.
Fig. 7 is the exemplary process diagram of the Write-protection method of an embodiment of the present disclosure.
In step 701, the first drive signal is received.
The write-protect port of chip is electrically connected with first voltage end according to the first drive signal in step 702, so as to
The level of write-protect port is pulled low to the first level.
By will the level of write-protect port be pulled low to the first level so that chip enters write state.
In some embodiments, after receiving the second drive signal, according to the second drive signal, by write-protect port and the
The electrical connection of one voltage end disconnects, and the level of write-protect port is pulled up to second electrical level using second voltage end, wherein first
Level is less than second electrical level.
By the way that the level of write-protect port is pulled up to second electrical level so that chip enters write-protect state.
The description of the disclosure provides for the sake of example and description, and is not exhaustively or by the disclosure
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle and practical application of the disclosure, and those skilled in the art is enable to manage
Solve various embodiments with various modifications of the disclosure to design suitable for special-purpose.
Claims (15)
1. a kind of write-protect circuit, including：
Switch sub-circuit, be configured as, according to the first drive signal, the write-protect port of chip being electrically connected with first voltage end,
So that the level of the write-protect port is pulled low to the first level.
2. write-protect circuit according to claim 1, wherein
Switching sub-circuit is additionally configured to, according to the second drive signal, disconnect the write-protect port and the first voltage end
Electrical connection.
3. write-protect circuit according to claim 2, further includes：
Sub-circuit is pulled up, is configured as in the case where the write-protect port and the first voltage end disconnect, by institute
The level for stating write-protect port is pulled up to second electrical level, wherein first level is less than the second electrical level.
4. write-protect circuit according to claim 3, wherein
The pull-up sub-circuit includes pull-up resistor and second voltage end, the first end of the pull-up resistor and the second voltage
End electrical connection, the second end of the pull-up resistor are electrically connected with the write-protect port.
5. write-protect circuit according to claim 2, the switching sub-circuit include：
First switch device is configured as entering conducting state according to first drive signal, is additionally configured to according to
Second drive signal enters off state；
Second switch device is configured as in the case where the first switch device is in the conduction state, by the write-protect
Port is electrically connected with the first voltage end, is additionally configured in the case where the first switch device enters off state,
Disconnect being electrically connected for the write-protect port and the first voltage end.
6. write-protect circuit according to claim 5, wherein
The first switch device is switching transistor；
The second switch device is relay.
7. write-protect circuit according to claim 6, wherein
The relay is configured as in the case where the switching transistor enters conducting state, relay coil obtain it is electric, after
Electric appliance normal open switch is closed so that the write-protect port is electrically connected with the first voltage end；It is additionally configured to open described
In the case that pass transistor enters off state, relay coil dead electricity, relay normally open switch disconnects so that the write-protect
Port is disconnected with the first voltage end.
8. write-protect circuit according to claim 7, wherein：
The switching transistor includes first electrode, second electrode and third electrode, and the first electrode is driven for receiving first
Dynamic signal or the second drive signal, the second electrode are electrically connected with one end of the relay coil, the third electrode and
The first voltage end electrical connection；
The other end of the relay coil is electrically connected with tertiary voltage end；
One end of the relay normally open switch is electrically connected with the first voltage end, the other end of the relay normally open switch
It is electrically connected with the write-protect port.
9. write-protect circuit according to claim 2, wherein the first voltage end is ground terminal.
10. a kind of write protector, including write-protect circuit as claimed in any one of claims 1-9 wherein.
11. write protector according to claim 10, further includes：
Controller, is configured as in the case where carrying out write operation to chip, and the first driving is sent to the write-protect circuit
Signal.
12. write protector according to claim 11, wherein
The controller is additionally configured to after said write operates, and the second driving letter is sent to the write-protect circuit
Number.
13. a kind of electrical equipment, including：Write protector as described in any one of claim 10 to 12.
14. a kind of Write-protection method, including：
Receive the first drive signal；
According to first drive signal, the write-protect port of chip is electrically connected with first voltage end, to write guarantor by described
The level of shield port is pulled low to the first level.
15. according to the method for claim 14, further including：
Receive the second drive signal；
According to second drive signal, the write-protect port and the first voltage end are electrically connected disconnection；
The level of the write-protect port is pulled up to second electrical level using second voltage end, wherein first level is less than institute
State second electrical level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810870889.7A CN108711440B (en) | 2018-08-02 | Write protection circuit, write protection method, write protection device and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810870889.7A CN108711440B (en) | 2018-08-02 | Write protection circuit, write protection method, write protection device and electrical equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108711440A true CN108711440A (en) | 2018-10-26 |
| CN108711440B CN108711440B (en) | 2024-04-30 |
Family
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445337A (en) * | 2018-10-31 | 2019-03-08 | 珠海格力电器股份有限公司 | Port protection circuit and its control method, control circuit, device and system |
| CN113218042A (en) * | 2021-04-29 | 2021-08-06 | Tcl空调器(中山)有限公司 | Air conditioner outdoor unit parameter modification method and device, storage medium and air conditioning system |
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| US5007027A (en) * | 1988-05-16 | 1991-04-09 | Fujitsu Limited | Data protection system in a data processing system |
| JPH10105422A (en) * | 1996-09-25 | 1998-04-24 | Fuji Electric Co Ltd | Control circuit of protecting device |
| US5796650A (en) * | 1997-05-19 | 1998-08-18 | Lsi Logic Corporation | Memory circuit including write control unit wherein subthreshold leakage may be reduced |
| CN2678275Y (en) * | 2003-12-26 | 2005-02-09 | 深圳创维－Rgb电子有限公司 | Write protector of TV. memory |
| CN102111917A (en) * | 2011-03-18 | 2011-06-29 | 中兴通讯股份有限公司 | Device for recovering mobile terminal download access |
| CN107871482A (en) * | 2017-10-26 | 2018-04-03 | 惠科股份有限公司 | Display device and its drive circuit and driving method |
| CN208819611U (en) * | 2018-08-02 | 2019-05-03 | 珠海格力电器股份有限公司 | Write-protect circuit, write protector and electrical equipment |
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5007027A (en) * | 1988-05-16 | 1991-04-09 | Fujitsu Limited | Data protection system in a data processing system |
| JPH10105422A (en) * | 1996-09-25 | 1998-04-24 | Fuji Electric Co Ltd | Control circuit of protecting device |
| US5796650A (en) * | 1997-05-19 | 1998-08-18 | Lsi Logic Corporation | Memory circuit including write control unit wherein subthreshold leakage may be reduced |
| CN2678275Y (en) * | 2003-12-26 | 2005-02-09 | 深圳创维－Rgb电子有限公司 | Write protector of TV. memory |
| CN102111917A (en) * | 2011-03-18 | 2011-06-29 | 中兴通讯股份有限公司 | Device for recovering mobile terminal download access |
| CN107871482A (en) * | 2017-10-26 | 2018-04-03 | 惠科股份有限公司 | Display device and its drive circuit and driving method |
| CN208819611U (en) * | 2018-08-02 | 2019-05-03 | 珠海格力电器股份有限公司 | Write-protect circuit, write protector and electrical equipment |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445337A (en) * | 2018-10-31 | 2019-03-08 | 珠海格力电器股份有限公司 | Port protection circuit and its control method, control circuit, device and system |
| CN109445337B (en) * | 2018-10-31 | 2021-05-07 | 珠海格力电器股份有限公司 | Port protection circuit and control method, control circuit, device and system thereof |
| CN113218042A (en) * | 2021-04-29 | 2021-08-06 | Tcl空调器(中山)有限公司 | Air conditioner outdoor unit parameter modification method and device, storage medium and air conditioning system |
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