CN100458745C - Extended flash disk - Google Patents
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- CN100458745C CN100458745C CNB2004100513723A CN200410051372A CN100458745C CN 100458745 C CN100458745 C CN 100458745C CN B2004100513723 A CNB2004100513723 A CN B2004100513723A CN 200410051372 A CN200410051372 A CN 200410051372A CN 100458745 C CN100458745 C CN 100458745C
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Abstract
Comparing with prior art, the disclosed flash disk solves issues of not easy to expand capacity of disk, and not possible to exchange data between two flash disks directly. The disclosed flash disk includes a control unit with a firmware setup inside and a flash memory unit. Characters are that the flash disk includes external interface for connecting to the control unit and flash unit. Data line of the external interface is connected to data line of the flash unit in parallel, and control line of the external interface is connected to data line of the flash unit in parallel. Pin for chip selection is connected to end for chip selection of the control end alone. Through the said external interface, connecting to other flash disks with relevant physical interface, the disclosed flash disk can execute operations for reading and writing data from/to the connected flash disk; or the disclosed flash disk and connected flash disk together is as a whole to exchange data with host.
Description
Technical field
The present invention relates to the data storage technology of flash disk, particularly a kind of flash disk of extendible capacity and expansion method thereof.
Background technology
On present market, the flash disk product overwhelming majority all is made up of control chip, flash chip (Flash) and peripheral component thereof, and along with flash disk is more and more universal, the data of consumer wants storage are more and more, jumbo flash disk also just occurs thereupon, and its memory capacity is fixed, but is enough for the memory capacity of flash disk in most of the cases, just need the user of bigger memory capacity once in a while, large-capacity flash memory is not fully used.
This phenomenon embodies particularly evidently in the situation that collective uses, for example, suppose that there are 40 employees in company, if buy the flash disk of 40 32M so, one of every employee, the capacity of 32M may be not enough sometimes, the data of copy are a plurality of small documents if desired in this case, then can also copy with the flash disk of a plurality of 32M in batches, and just operation can be more loaded down with trivial details, but if a file, even then there is the flash disk of a plurality of 32M also to have no usage greater than 32M; If buy the flash disk of 40 64M, cause waste when those are most of again; If the branch capacity is bought then bad distribution.
In order to change the memory capacity of flash disk flexibly, industry has been released the flash disk of replaceable flash chip, by changing the memory capacity that flash chip changes flash disk, as the applicant's 03159669.X Chinese patent application " storage medium stationary installation and use the mobile memory of this stationary installation ", and 200310115102.X Chinese patent application " data management method of mobile storage device " etc.But it is loaded down with trivial details that the storage chip of regular replacing flash disk is not only operated, and easily cause the wearing and tearing of flash disk.
If can make two independently flash disk realize the large-capacity flash memory that memory capacity is two flash disk capacity sums by simple connection, then can address the above problem well.
In addition, another problem that exists in the use of flash disk is at present, because usb protocol is principal and subordinate's agreement, can't directly carry out copying data between two flash disks, though present USB OTG (On The Go) technology can support directly to carry out between two flash disks exchanges data, OTG mainly is based on usb protocol and realizes exchanges data, and it realizes comparatively complicated, and because have this middle layer of USB between two flash disks, the speed of exchanges data can be subjected to certain influence.So, how to make two independently flash disk just can realize exchanges data by simple connection, become problem demanding prompt solution.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of flash disk that can realize the extendible capacity of capacity extension easily, in order to overcoming flash disk capacity extension inconvenience in the prior art, and the direct problem of swap data between two flash disks.
For achieving the above object, the invention provides a kind of extendible capacity flash disk, described extendible capacity flash disk comprises control module, flash cell, and the external interface that is connected with flash cell with described control module, be provided with solidification software in the described control module, it is characterized in that: described extendible capacity flash disk also is connected with the flash disk of respective physical interface by described external interface, when described extendible capacity flash disk is connected with main frame, described solidification software is used for resolving the reading and writing data order address pointed that main frame sends, and judge the scope of described address, if described address has exceeded the address realm of described extendible capacity flash disk, then the flash disk that is connected is carried out corresponding data read-write operation, make described extendible capacity flash disk and the flash disk that is connected make the exchanges data of as a whole realization and main frame according to described address.
Preferably, the data line of described external interface is in parallel with the data line of described flash cell, and its control line is in parallel with the data line of described flash cell, and its sheet selects pin to be connected with the sheet choosing end of described control module separately.
Preferably, described extendible capacity flash disk is connected with main frame and when making the exchanges data of as a whole realization and main frame with the flash disk that is connected, described solidification software also is used to carry out following steps:
2-1) obtain power supply and finish electro-detection from main frame;
2-2) reception is from the reading and writing data order of main frame.
Preferably, described extendible capacity flash disk also comprises display unit and operating key, can be by directly the flash disk that is connected being carried out data read-write operation under the situation that described display unit and operating key are realized not with main frame is connected.
The present invention also provides another kind of extendible capacity flash disk, described extendible capacity flash disk comprises control module, flash cell, and the external interface that is connected with flash cell with described control module, be provided with solidification software in the described control module, it is characterized in that: described flash disk also comprises the storage card that connects by described external interface, when described extendible capacity flash disk is connected with main frame, described solidification software is used for resolving the reading and writing data order address pointed that main frame sends, and judge the scope of described address, if described address exceeds the address realm of described extendible capacity flash disk, then according to the offset address in the storage card that is connected of this address computation correspondence, and the storage card of described connection is carried out corresponding data read-write operation according to described offset address, make described extendible capacity flash disk and the storage card that is connected make the exchanges data of as a whole realization and main frame.
Preferably, when described extendible capacity flash disk was made the exchanges data of as a whole realization and main frame with the storage card that is connected, described solidification software was carried out following steps:
10-1) obtain power supply and finish electro-detection, divide address space, enter armed state from main frame;
10-2) reception is from the reading and writing data order of main frame.
Adopt extendible capacity flash disk of the present invention, can realize the expansion of flash disk capacity easily, and the direct exchange of data between two flash disks.
Description of drawings
Fig. 1 is the circuit block diagram of the flash disk of extendible capacity of the present invention;
Fig. 2 is the circuit theory diagrams of flash disk first embodiment of extendible capacity of the present invention;
Fig. 2 is the read-write process flow diagram of flash disk first embodiment of extendible capacity of the present invention;
Fig. 4 is the read-write process flow diagram to another embodiment of flash disk of extendible capacity of the present invention.
Embodiment
Introduce the present invention in detail below in conjunction with accompanying drawing, accompanying drawing only is used for explanation, is not the restriction to scope of patent protection of the present invention.
See also Fig. 1, extendible capacity flash disk of the present invention comprises: control module, flash cell and external interface, be provided with solidification software in the described control module, data/the address wire of described external interface is in parallel with the data line of described flash cell, its control line is in parallel with the control line of described flash cell, it is to link to each other with described control control separately that the sheet of its external interface selects pin, this external interface can corresponding one or more physical interfaces, the extendible capacity flash disk can be connected with another extendible capacity flash disk by described external interface, also can be connected and realize the capacity extension function with the normal flash dish that the respective physical interface is provided, the described normal flash dish of respective physical interface that provides is meant the flash disk that the corresponding physical interface that is connected with the extendible capacity flash disk is provided on the basis of existing flash disk, and the solidification software of this flash disk does not need to do any change with respect to existing flash disk.
Described extendible capacity flash disk also can comprise power supply unit, display unit and operating key (Fig. 1 does not show), with realize not with situation that main frame is connected under, direct file to connected flash disk manages and data read-write operation.
See also Fig. 2, described control module can realize that described flash cell can realize that described external interface can be realized by interface J5 shown in Figure 5 by flash chip U2 shown in Figure 2 by control chip U1 shown in Figure 2.As shown in the figure, the data line I/O1-I/O7 of flash chip U2 and the data line E0-E7 of interface J5 are connected in parallel on the pin PD0-PD7 of control chip U1, the control signal wire of the control signal wire of flash chip U2 and interface J5 is connected in parallel on the PA0-PA5 of pin of control chip U1, and the sheet choosing end CE of the sheet of flash chip U2 choosing end CE1 and interface J5 is connected pin PB7/D7 and the PB6/D6 of control chip U1 respectively.
There are following two kinds of working methods in the described flash disk of present embodiment: (main flash dish hereinafter is meant, after two flash disks are connected by external interface, wherein be used for the flash disk that directly is connected with main frame, perhaps be not connected and directly read the flash disk of the data in the coupled flash disk with main frame, obviously, herein just be meant the flash disk that is connected with the main flash dish from flash disk)
One, the working method that is connected with main frame: two described extendible capacity flash disks are connected, and one of them flash disk are connected with main frame as the work of main flash dish, another then conduct from flash disk work; Described extendible capacity flash disk also can connect the normal flash dish that the respective physical interface is provided and realize the capacity extension function, the extendible capacity flash disk connects main frame and works as the main flash dish, the common flash disk conduct that is connected is from flash disk work, realize data manipulation by main frame to the main flash dish with from flash disk, this main frame is considered as a whole memory device with described main flash dish with from flash disk.
Two, the working method that is not connected with main frame: two described extendible capacity flash disks are connected, and one of them flash disk is worked in main flash dish mode, and another flash disk is carried out data manipulation; Described extendible capacity flash disk is connected the normal flash dish that the respective physical interface is provided realize the capacity extension function, described extendible capacity flash disk is worked as the main flash dish, the normal flash dish that connected as from flash disk as from flash disk work, by the main flash dish to carrying out data manipulation from flash disk.
See also Fig. 3, aforementioned first kind of working method promptly with working method that main frame is connected in, described solidification software will be carried out following flow process:
Whether step 10, extendible capacity flash disk be with after main frame is connected, promptly as the work of main flash dish, can automatic detection during electro-detection on the main flash dish have from flash disk and insert, and do not work from the control chip and the program of flash disk, and described testing process is as follows:
When the solidification software of described main flash dish detects, the described external interface of hypothesis has connected from flash disk earlier, reads this Flash model ID from flash disk then, if can read, then truly having from flash disk of explanation connects, otherwise means and do not connect from flash disk.
If do not connect from flash disk, then by the read-write mode work of normal flash dish, the read-write mode of normal flash dish is known for industry, is not repeated them here;
If be connected with, then enter step 12 from flash disk;
If surpassing the memory capacity of main flash dish, this address value then enters step 20;
Whether step 20 detects once more and describedly still exists from flash disk;
Then enter step 22 if read the Flash model ID of flash disk;
Need to prove that when two flash disks linked together for the first time, the file system in the main flash dish did not comprise from flash disk, so could normally use after two flash disk formats that need to link together.After this if will separate independent use, need again respectively two flash disk formats.
The working method that aforementioned second kind of working method promptly is not connected with main frame describes below:
When the extendible capacity flash disk need not with situation that main frame is connected under when working, then need in flash disk, to add power supply units such as battery, not needing to realize connecting the exchanges data between two flash disks of main frame, if add LCD or other display device as display unit again, and suitable operating key, then can realize the file management of two flash disks under the situation that off participates in easily.In this kind working method, the flow process that solidification software is carried out is as follows:
Detecting when flash disk powers on is powered battery or the power supply that provides by PC data lines such as USB;
If the power supply that PC data lines such as USB provide, then according to aforementioned work flow process when being connected with main frame;
If powered battery, whether then earlier similar abovementioned steps 10 detections have connected from flash disk, if judged result is to have connected flash disk, then prepare to start two flash disk document management mode, described pair of flash disk document management mode is: the main flash dish detects earlier the file system on himself the flash chip, and be written into this document system, detect the flash chip from the flash disk then, and be written into the file system of its use.The main flash dish with himself flash chip and from the flash chip of flash disk as two independently memory carrier handle the flash chip of promptly thinking separately separately file system, copies data mutually all arranged.
Suppose to provide LCD, initialization LCD then, and show two file contents on the flash disk, and carry out appropriate responsive according to keypress function, the function of described button can preestablish.
If two flash disks all are not connected with main frame, and all only under the situation in charged source, because power-on has sequencing, it is charged that the equipment of back opening power just can detect another flash disk by a connecting line that detects power supply, just stop the operation that powers on, and oneself is closed.And the equipment of first opening power just can not closed automatically because do not detect the power supply of the other end, then powers on fully as the main flash dish.
As another embodiment of the present invention, the external interface that described flash disk provides can be memory card interfaces such as SD card, mmc card, CF card, and this moment, external interface circuit was identical with card reader card circuit, did not give unnecessary details at this.Described flash disk can be expanded by a multimedia card, also can be by many multimedia card expansions, and what both were different is exactly that predefined address realm need be divided into multistage, handles according to multistage address definition scope when map addresses and skew.
See also Fig. 4, the workflow of the flash disk of extendible capacity described in the present embodiment is as follows:
At first, consult step 30, when flash disk powers on, after the initialization of finishing embedded Flash, just can carry out detection, the interface that the card of different types is corresponding different to external memory card, can detect according to different cards related protocol separately, can judge whether card has access by detecting CD1 and CD2 pin such as the CF card, and the SD card can be realized identical judgement by detecting the CD/DAT3 pin, other different card all has similar approach to realize the detection of card.
After finishing electro-detection, memory capacity size and type according to detected card are carried out the address space division, for example, the memory capacity of flash disk is 32M, detecting each one on SD card and CF card when powering on inserts, and the capacity that has obtained card is respectively 64M and 128M, total volume is 224M as can be known, the counterlogic address space is that 0x00000000 is to 0x0DFFFFFF, wherein the FLASH capacity of flash disk self occupies the address space of 0x00000000 to 0x01FFFFFF, arrange the SD card to occupy the address space of 0x02000000, and the CF card occupy the address space of 0x06000000 to 0x0DFFFFFF to 0x05FFFFFF.After the capacity that performs is divided, then enter the stage of waiting for Host Command.
Entering step 26 then, judge described address realm, divide according to predefined address and analyze this address, is memory block or its expansion area of flash disk self with what judge described reading and writing data order desire operation;
If the memory block of the corresponding flash disk self in described address then enters step 38, flash disk is carried out the corresponding data read-write operation;
Whether if the expansion area of the corresponding flash disk in described address then enters step 40, then detecting has storage card to insert, and the detection method whether test card is inserted is the same with common card reader;
Enter step 42 then and calculate offset address, if the order of receiving address correspondence pointed multimedia card addresses distributed scope, then this address is offset conversion, such as the address of the corresponding 0x00000000 of the Flash of flash disk to 0x0DFFFFFF, and a SD card correspondence address of 0x02000000 to 0x05FFFFFF, so the instruction of receiving be at 0x02000120 in, this address can be deducted 0x02000000, as can be known this address correspondence the 0x0120 address of SD card, then this instruction is carried out in this address of SD card by normal read-write multimedia card flow process.
If the situation of two expansion cards is arranged, suppose that the address is divided and the card capacity meets aforesaid example, the memory capacity of flash disk is 32M, detecting each one on SD card and CF card when powering on inserts, and the capacity that has obtained card is respectively 64M and 128M, total volume is 224M as can be known, the counterlogic address space is that 0x00000000 is to 0x0DFFFFFF, wherein the FLASH capacity of flash disk self occupies the address space of 0x00000000 to 0x01FFFFFF, arrange the SD card to occupy the address space of 0x02000000, and the CF card occupy the address space of 0x06000000 to 0x0DFFFFFF to 0x05FFFFFF.If then the main frame order of sending is to point to address 0x09244343's, so by parsing to this address, should instruct as can be known practical operation to the CF card, and the actual address of the 0x09244343-0x06000000=0x03244343 of corresponding CF card, so can be by the control read-write protocol of CF card, the data that need transmit main frame are sent to this address of CF card.If multimedia card is removed suddenly in the read-write process, then need to carry out corresponding error and handle, this treatment scheme is identical with the flow process that is illegally removed processing from flash disk, does not repeat them here.
The above only is a preferred implementation of the present invention; it will be appreciated by those skilled in the art that; these embodiments should not constitute the restriction to scope of patent protection of the present invention; all equivalent structure transformations that carries out on the basis of instructions of the present invention and the disclosed content of accompanying drawing are in the scope of patent protection of the present invention that all is included in claims of the present invention and is limited.
Claims (10)
1. extendible capacity flash disk, described extendible capacity flash disk comprises control module, flash cell, and the external interface that is connected with flash cell with described control module, be provided with solidification software in the described control module, it is characterized in that: described extendible capacity flash disk also comprises the flash disk that is connected with the respective physical interface by described external interface, when described extendible capacity flash disk is connected with main frame, described solidification software is used for resolving the reading and writing data order address pointed that main frame sends, and judge the scope of described address, if described address has exceeded the address realm of described extendible capacity flash disk, then the flash disk that is connected is carried out corresponding data read-write operation, make described extendible capacity flash disk and the flash disk that is connected make the exchanges data of as a whole realization and main frame according to described address.
2. extendible capacity flash disk according to claim 1, it is characterized in that, data line according to described external interface is in parallel with the data line of described flash cell, and its control line is in parallel with the data line of described flash cell, and its sheet selects pin to be connected with the respective pin of described control module separately.
3. extendible capacity flash disk according to claim 1 is characterized in that, described extendible capacity flash disk is connected with main frame and when making the exchanges data of as a whole realization and main frame with the flash disk that is connected, described solidification software also is used to carry out following steps:
2-1) obtain power supply and finish electro-detection from main frame;
2-2) reception is from the reading and writing data order of main frame.
4. extendible capacity flash disk according to claim 3, it is characterized in that, according to described address the step that the flash disk that is connected carries out corresponding data read-write operation is further comprised: detect the flash disk that is connected and whether still exist, if exist the capacity that then described address is deducted described extendible capacity flash disk to obtain offset address, according to this offset address the flash disk that is connected carried out corresponding data read-write operation again.
5. extendible capacity flash disk according to claim 1 is characterized in that, described extendible capacity flash disk also comprises power supply unit, and described extendible capacity flash disk can with under the situation that main frame is connected directly not carry out data read-write operation to the flash disk that is connected.
6. extendible capacity flash disk according to claim 5, it is characterized in that, described extendible capacity flash disk also comprises display unit and operating key, can be by directly the flash disk that is connected being carried out data read-write operation under the situation that described display unit and operating key are implemented in not with main frame is connected.
7. according to claim 5 or 6 described extendible capacity flash disks, it is characterized in that, described extendible capacity flash disk directly carries out data read-write operation to the flash disk that is connected and may further comprise the steps: energized detects external interface and whether has connected flash disk, starts two flash disk document management mode if external interface has connected flash disk.
8. extendible capacity flash disk according to claim 7 is characterized in that, described pair of flash disk document management mode is: the extendible capacity flash disk detects earlier the file system on himself the flash cell, and is written into this document system; Detect the flash cell on the flash disk that external interface connects then, and be written into the file system of its use; Described extendible capacity flash disk with the flash cell of flash cell of himself and the flash disk that is connected as two independently memory carrier handle, think that separately flash cell all has file system separately, copies data mutually.
9. extendible capacity flash disk, described extendible capacity flash disk comprises control module, flash cell, and the external interface that is connected with flash cell with described control module, be provided with solidification software in the described control module, it is characterized in that: described extendible capacity flash disk also comprises the storage card that connects by described external interface, when described extendible capacity flash disk is connected with main frame, described solidification software is used for resolving the reading and writing data order address pointed that main frame sends, and judge the scope of described address, if described address exceeds the address realm of described extendible capacity flash disk, then according to the offset address in the storage card that is connected of this address computation correspondence, and the storage card of described connection is carried out corresponding data read-write operation according to described offset address, make described extendible capacity flash disk and the storage card that is connected make the exchanges data of as a whole realization and main frame.
10. extendible capacity flash disk according to claim 9 is characterized in that, when making the exchanges data of as a whole realization and main frame with the storage card that is connected, described solidification software also is used to carry out following steps:
10-1) obtain power supply and finish electro-detection, divide address space, enter armed state from main frame;
10-2) reception is from the reading and writing data order of main frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100513723A CN100458745C (en) | 2004-08-31 | 2004-08-31 | Extended flash disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100513723A CN100458745C (en) | 2004-08-31 | 2004-08-31 | Extended flash disk |
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| CN1744062A CN1744062A (en) | 2006-03-08 |
| CN100458745C true CN100458745C (en) | 2009-02-04 |
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| CNB2004100513723A Active CN100458745C (en) | 2004-08-31 | 2004-08-31 | Extended flash disk |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108597470B (en) * | 2018-05-08 | 2021-01-01 | Tcl华星光电技术有限公司 | Display device driving system and method and display device |
| CN111078150A (en) * | 2019-12-18 | 2020-04-28 | 成都定为电子技术有限公司 | High-speed storage equipment and uninterrupted capacity expansion method |
| CN111459419B (en) * | 2020-06-17 | 2021-12-21 | 芯天下技术股份有限公司 | Non-inductive capacity expansion method, system, storage medium and terminal for FLASH |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1139224A2 (en) * | 1997-11-18 | 2001-10-04 | SCM Microsystems Limited | Memory card interface apparatus |
| CN1435796A (en) * | 2002-01-30 | 2003-08-13 | 记忆科技(深圳)有限公司 | Memroy drive device compatible with multiple mobile memory cards |
| CN1504891A (en) * | 2002-11-29 | 2004-06-16 | 笙泉科技股份有限公司 | Expandable memory device |
| CN1524634A (en) * | 2003-02-28 | 2004-09-01 | 联想(北京)有限公司 | Method for rapidly filtering products |
-
2004
- 2004-08-31 CN CNB2004100513723A patent/CN100458745C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1139224A2 (en) * | 1997-11-18 | 2001-10-04 | SCM Microsystems Limited | Memory card interface apparatus |
| CN1435796A (en) * | 2002-01-30 | 2003-08-13 | 记忆科技(深圳)有限公司 | Memroy drive device compatible with multiple mobile memory cards |
| CN1504891A (en) * | 2002-11-29 | 2004-06-16 | 笙泉科技股份有限公司 | Expandable memory device |
| CN1524634A (en) * | 2003-02-28 | 2004-09-01 | 联想(北京)有限公司 | Method for rapidly filtering products |
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