CN107450850B - Memory card read-write protection device and control method thereof - Google Patents
Memory card read-write protection device and control method thereof Download PDFInfo
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- CN107450850B CN107450850B CN201710596315.0A CN201710596315A CN107450850B CN 107450850 B CN107450850 B CN 107450850B CN 201710596315 A CN201710596315 A CN 201710596315A CN 107450850 B CN107450850 B CN 107450850B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/062—Securing storage systems
- G06F3/0622—Securing storage systems in relation to access
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
- G06F3/0658—Controller construction arrangements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
- G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
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Abstract
The invention relates to a memory card read-write protection device, which is arranged on a host system, wherein the host system is provided with a second signal interface and a control signal transmitting pin; the memory card read-write protection device comprises a main control module, a judgment control module and an access interface module; the judgment control module is provided with a first connecting end, a second connecting end and a third connecting end, the first connecting end is connected with the control signal transmitting pin, the second connecting end is communicated with the main control module to form a first channel, and the third connecting end is connected with the access interface module to form a second channel. The memory card read-write protection device is provided with a judgment control module as an intermediate station which is respectively connected with a host system, a main control module and an access interface module; the judging control module controls the on-off of the read-write signal between the main control module and the access interface module according to the control signal of the host system, and the read-write function control of the main control module on the memory card is realized.
Description
Technical Field
The invention relates to the technical field of memory cards, in particular to a memory card read-write protection device and a control method thereof.
Background
At present, Digital memory cards, especially SD memory cards (Secure Digital Card), are widely used for information storage and circulation in daily Digital equipment, and are the most widely used memory cards. As one of the medium storage devices, important media for data storage and data transfer between desktop computers (PCs), Notebook computers (notebooks PCs), Tablet computers (tablets), various industrial devices, digital cameras, AV machines, and the like are widely and frequently used in daily life and work.
In the use of the SD memory card, there are often misoperation that deletes important information in the memory card by mistake, or in the process that a computer, especially a public area device, provides a popular user to read or upload data of the SD memory card, viruses and the like are written into the memory card, causing a great loss to the user.
Disclosure of Invention
Therefore, the invention provides a storage card read-write protection device and a control method thereof, which can provide intelligent protection for the read-write of a storage card, avoid the mistaken deletion of the storage content, prevent the write-in of bad contents such as viruses and the like and ensure the safety of data.
A kind of storage card read-write protective device, is used for installing on host computer system, is used for operating the data in the storage card, the said host computer system has a second signal interface and control signal to launch the foot, the said storage card has a slide switch, the said storage card read-write protective device includes a main control module used for connecting the said host computer system, judges the control module, and connects the access interface module of the said judgment control module of the said main control module; the judgment control module is provided with a first connecting end, a second connecting end and a third connecting end, the first connecting end is used for connecting a control signal transmitting pin of the host system, the second connecting end is connected with the main control module to form a first channel, and the third connecting end is connected with the access interface module to form a second channel; the judgment control module receives a control signal from the host system through the first connecting end to judge, controls the connection or disconnection of the first channel and the second channel, and realizes the read-write or read-only function switching of the memory card read-write protection device.
The memory card read-write protection device is provided with a judgment control module as an intermediate station which is respectively connected with a host system, a main control module and an access interface module; the judging control module controls the on-off of the read-write signal between the main control module and the access interface module according to the control signal of the host system, thereby realizing the function switching of the main control module to the read-write or read-only of the memory card.
In one embodiment, the main control module comprises a main control chip and a control circuit connected with the main control chip; the main control chip is provided with a first signal interface connected with the second signal interface, a write protection control pin connected with the second connecting end, and a first data exchange interface connected with the access interface module.
In one embodiment, the first signal interface and the second signal interface are both I/O interfaces.
In one embodiment, the access interface module is provided with a write protection signal pin connected with the third connection terminal and a second data exchange interface connected with the first data exchange interface.
In one embodiment, the slide switch is electrically connected to the write protect signal pin.
In one embodiment, the access interface module is provided with a card slot, and the card slot is used for accommodating and connecting the memory card.
In one embodiment, the judgment control module is designed by one or more combinations of an electronic switch, a mechanical switch or a switch circuit.
In one embodiment, a memory card read-write protection device is installed on a host system and used for operating data in a memory card, the host system is provided with a second signal interface and a control signal transmitting pin, and the memory card is provided with a sliding switch and is characterized by comprising a main control module connected with the host system, a judgment control module connected with the main control module and an access interface module connected with the judgment control module; the judgment control module is also connected with the host system, and the access interface module is also connected with the main control module; the judgment control module is provided with a first connecting end, a second connecting end and a third connecting end, the first connecting end is connected with the control signal transmitting pin, the second connecting end is communicated with the main control module to form a first channel, and the third connecting end is connected with the access interface module to form a second channel; the main control module comprises a main control chip and a control circuit connected with the main control chip; the main control chip is provided with a first signal interface connected with the second signal interface, a write protection control pin connected with the second connecting end and a first data exchange interface connected with the access interface module;
the control method of the memory card read-write protection device comprises the following steps:
step S1: the host system is powered on, the host system sends a control signal to the judgment control module, and the step S2 is executed;
step S2: the judging control module receives the control signal, judges whether the control signal is a high level signal, if so, enters step S3; otherwise, go to step S4;
step S3: conducting the first channel and the second channel, and proceeding to step S5;
step S4: the first channel and the second channel are not conducted, and the process proceeds to step S7;
step S5: judging the position of a sliding switch of the memory card, and if the sliding switch is in an unlock position, entering step S6; otherwise, go to step S7;
step S6: for the memory card, data can be read and written;
step S7: for the memory card, only data can be read, and data cannot be written.
Drawings
FIG. 1 is a schematic diagram of an application of a read/write protection device for a memory card according to a preferred embodiment of the present invention;
FIG. 2 is a flow chart illustrating a control method of the read/write protection apparatus for the memory card shown in FIG. 1;
reference is made to the accompanying drawings in which:
100-memory card read-write protection device;
10-a main control module, 11-a main control chip, 12-a first signal interface, 13-a write protection control pin and 14-a first data exchange interface;
20-judgment control module, 21-first connecting end, 22-second connecting end and 23-third connecting end;
30-access interface module, 31-write protection signal pin, 32-second data exchange interface;
200-host system, 201-second signal interface, 202-control signal transmitting pin;
300-memory card, 301-slide switch.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1 and fig. 2, a memory card read/write protection device 100 according to a preferred embodiment of the invention is installed on a host system 200 for reading and writing data in a memory card 300. The memory card read-write protection device 100 comprises a main control module 10 connected with the host system 200, a judgment control module 20 connected with the main control module 10, and an access interface module 30 connected with the judgment control module 20; the judgment control module 20 is further connected to the host system 200, and the access interface module 30 is further connected to the main control module 10.
The main control module 10 includes a main control chip 11 and a control circuit (not shown) connected to the main control chip 11, and the main control chip 11 is provided with a first signal interface 12, a write protection control pin 13 and a first data exchange interface 14. Specifically, the first signal interface 12 is connected to the host system 200, the write-protection control pin 13 is connected to the judgment control module 20, and the first data interface 14 is connected to the access interface module 30.
The judgment control module 20 is provided with a first connection end 21, a second connection end 22 and a third connection end 23. The first connection end 21 is connected to the host system 200 for receiving a control signal. The second connection terminal 22 is connected to the write-protect control pin 13 to form a first channel, and the third connection terminal 23 is connected to the access interface module 30 to form a second channel. When the system works, the judgment control module 20 receives a control signal from the host system 200 through the first connection end 21 to perform judgment, and controls the on-off of the first channel and the second channel, so as to realize the function switching of reading and writing or only reading of the memory card reading and writing protection device 100.
In this embodiment, the determination control module 20 is an electronic switch, and specifically, the determination control module 20 is an MOS transistor 2N 7002; the gate (G pole) of the determination control module 20 is the first connection end 21, the drain (D pole) is the second connection end 22, and the source (S pole) is the third connection end 23. In other embodiments, the determination control module 20 may also be one or more combinations of other electronic switches, mechanical switches, or switch circuits, and may have an on-off control function.
In this embodiment, the access interface module 30 is a storage card socket. The access interface module 30 is provided with a card slot (not shown) for receiving and connecting the memory card 300 to implement data operation. The access interface module 30 has a write-protect signal pin 31 and a second data interface 32. Specifically, the write-protect signal pin 31 is connected to the third connection terminal 23 to form the second channel. The second data interface 32 is connected to the first data interface 14 for implementing data operation.
The host system 200 is provided with a second signal interface 201 and a control signal transmitting pin 202, the second signal interface 201 is connected to the first signal interface 12, and the control signal transmitting pin 202 is connected to the first connection end 21. In this embodiment, the first signal interface 12 is a USB interface, the second interface 201 is a USB interface socket, and the first signal interface 12 and the second signal interface 201 are connected by a USB data line. In other embodiments, the first signal interface 12 and the second signal interface 201 may also be PCI-E interfaces or other I/O interfaces, and may perform the same function as the present embodiment.
The memory card 300 is inserted into the access interface module 30, in this embodiment, the memory card 300 is a UHS-ii SD memory card, and the memory card 300 has a slide switch 301 for switching the read/write and write protection functions of the memory card 300. The sliding switch 301 is electrically connected to the write protection signal pin 31, and is configured to transmit a read/write signal to the determination control module 20 through the second channel, and then transmit the read/write signal to the main control module 10 through the first channel by the determination control module 20, and the main control module 10 implements switching of read/write or write protection functions according to the presence or absence of the read/write signal, where the function is conventional technology, and details are not described herein again. In other embodiments, the memory card 300 can also be other types of memory cards, such as UHS-I SD memory card, MiniSD card with adapter, MicroSD card with adapter, and the like.
The control method of the memory card read-write protection device comprises the following steps:
assuming that the determination control module 20 is an MOS transistor 2N7002 as an example, when the control signal transmitting pin 202 of the host system 200 outputs a low level signal, the first connection end 21 of the determination control module 20 receives the low level signal, so that the second connection end 22 and the third connection end 23 of the determination control module 20 are both in an off state, that is, the first channel and the second channel are both off. At this time, no matter the slide switch 301 of the memory card 300 is in the lock position or the unlock position, the main control module 10 cannot receive the read-write signal, and the memory card read-write protection device 100 can only read data in the memory card 300 and cannot write the data in the memory card, which is referred to as a "forced read-only mode".
When the control signal transmitting pin 202 of the host system 200 outputs a high level signal, the first connection end of the determination control module 20 receives the high level signal, so that the second connection end 22 and the third connection end 23 of the determination control module 20 are both in a conducting state, that is, the first channel and the second channel are both in a conducting state. At this time, the main control module 10 can receive the read/write signal from the memory card 300; further, when the slide switch 301 of the memory card 300 is in the unlock position, the main control module 10 receives a read-write signal from the memory card 300, and the memory card read-write protection device 100 can read or write data in the memory card 300, which is denoted as a "read-write mode"; when the slide switch 301 of the memory card 300 is in the lock position, the main control module 10 cannot receive the read-write signal from the memory card 300, and the memory card read-write protection device 100 can only read data from the memory card 300, but cannot write data into the memory card, and is marked as a "read-only mode".
The memory card read-write protection device is provided with a judgment control module as an intermediate station which is respectively connected with a host system, a main control module and an access interface module; the judging control module controls the on-off of the read-write signal between the main control module and the access interface module according to the control signal of the host system, thereby realizing the function switching of the main control module to the read-write or read-only of the memory card; furthermore, according to different application occasions, a 'forced read-only mode' can be locked, data in a user memory card can only be read but cannot be written, and the safety of the data in the memory card is ensured; the authority can be opened, so that the user can freely select a read-write mode or a read-only mode to read and write the data in the memory card.
The technical features of the above embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A memory card read-write protection device is used for being installed on a host system and used for operating data in a memory card, the host system is provided with a second signal interface and a control signal transmitting pin, the memory card is provided with a sliding switch, and the device is characterized in that,
the memory card read-write protection device comprises a main control module used for connecting the host system, a judgment control module connected with the main control module and an access interface module connected with the judgment control module;
the judgment control module is provided with a first connecting end, a second connecting end and a third connecting end, wherein the judgment control module is an MOS (metal oxide semiconductor) tube, the grid electrode of the judgment control module is the first connecting end, the drain electrode of the judgment control module is the second connecting end, and the source electrode of the judgment control module is the third connecting end;
the first connecting end is used for connecting a control signal transmitting pin of the host system, the second connecting end is connected with the main control module to form a first channel, and the third connecting end is connected with the access interface module to form a second channel; the access interface module is provided with a write protection signal pin and a second data exchange interface connected with the first data exchange interface, and the write protection signal pin is connected with the third connecting end to form the second channel;
the judging control module receives a control signal from the host system through a first connecting end to judge, controls the connection or disconnection of the first channel and the second channel, and realizes the read-write or read-only function switching of the memory card read-write protection device;
the sliding switch is electrically connected with the write protection signal pin.
2. The device of claim 1, wherein the host module comprises a host chip and a control circuit connected to the host chip; the main control chip is provided with a first signal interface connected with the second signal interface, a write protection control pin connected with the second connecting end, and a first data exchange interface connected with the access interface module.
3. The device of claim 2, wherein the first signal interface and the second signal interface are both I/O interfaces.
4. The device as claimed in claim 1, wherein the access interface module is further connected to the host module.
5. The device of claim 4, wherein the access interface module is a card socket.
6. The device as claimed in claim 5, wherein the access interface module has a card slot for receiving and connecting the memory card.
7. The device as claimed in claim 1, wherein the judgment control module is a MOS transistor 2N 7002.
8. A control method of a storage card read-write protection device is characterized in that the storage card read-write protection device is arranged on a host system and used for operating data in a storage card, the host system is provided with a second signal interface and a control signal transmitting pin, the storage card is provided with a sliding switch, and the storage card read-write protection device also comprises a main control module connected with the host system, a judgment control module connected with the main control module and an access interface module connected with the judgment control module; the judgment control module is also connected with the host system, and the access interface module is also connected with the main control module; the judgment control module is provided with a first connecting end, a second connecting end and a third connecting end, wherein the judgment control module is an MOS (metal oxide semiconductor) tube, the grid electrode of the judgment control module is the first connecting end, the drain electrode of the judgment control module is the second connecting end, and the source electrode of the judgment control module is the third connecting end; the first connecting end is connected with the control signal transmitting pin, the second connecting end is communicated with the main control module to form a first channel, and the third connecting end is connected with the access interface module to form a second channel; the access interface module is provided with a write protection signal pin and a second data exchange interface connected with the first data exchange interface, and the write protection signal pin is connected with the third connecting end to form the second channel; the sliding switch is electrically connected with the write protection signal pin; the main control module comprises a main control chip and a control circuit connected with the main control chip; the main control chip is provided with a first signal interface connected with the second signal interface, a write protection control pin connected with the second connecting end and a first data exchange interface connected with the access interface module;
the control method of the memory card read-write protection device comprises the following steps:
step S1: the host system is powered on, the host system sends a control signal to the judgment control module, and the step S2 is executed;
step S2: the judging control module receives the control signal, judges whether the control signal is a high level signal, if so, enters step S3; otherwise, go to step S4;
step S3: conducting the first channel and the second channel, and proceeding to step S5;
step S4: the first channel and the second channel are not conducted, and the process proceeds to step S7;
step S5: judging the position of a sliding switch of the memory card, and if the sliding switch is in an unlock position, entering step S6; otherwise, go to step S7;
step S6: for the memory card, data can be read and written;
step S7: for the memory card, only data can be read, and data cannot be written.
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| CN201710596315.0A CN107450850B (en) | 2017-07-20 | 2017-07-20 | Memory card read-write protection device and control method thereof |
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| CN201710596315.0A CN107450850B (en) | 2017-07-20 | 2017-07-20 | Memory card read-write protection device and control method thereof |
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| CN110175485A (en) * | 2019-05-28 | 2019-08-27 | 江苏永瀚特种合金技术有限公司 | A kind of unidirectionally read-only card reader, unidirectional card-reading system and read-only method |
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| CN103903042A (en) * | 2014-03-25 | 2014-07-02 | 杭州晟元芯片技术有限公司 | Data flow encryption SD card |
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