CN1822204B - System and device for compressing and decompressing stored data in portable data storage device - Google Patents
System and device for compressing and decompressing stored data in portable data storage device Download PDFInfo
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- CN1822204B CN1822204B CN 200610065823 CN200610065823A CN1822204B CN 1822204 B CN1822204 B CN 1822204B CN 200610065823 CN200610065823 CN 200610065823 CN 200610065823 A CN200610065823 A CN 200610065823A CN 1822204 B CN1822204 B CN 1822204B
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- 238000013144 data compression Methods 0.000 claims description 18
- 230000006837 decompression Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 abstract description 13
- 230000006870 function Effects 0.000 description 8
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Abstract
This invention provides a portable storage device, which can be connected with personal computers conveniently by USB port, IEEEI 394 hot line port or similar ports, in which, said device includes a compression/de-compression engine capable of compressing and de-compressing data and data in the personal computers and other host platforms are compressed by it then stored in a memory of a portable storage device, the compressed data are fetched by the engine and de-compressed then sent to the computers to be used by users.
Description
The application is that application number is 02825073.7, and the applying date is on May 13rd, 2002, the dividing an application of the Chinese patent application that denomination of invention is consistent with the application.It is relevant with the following U.S. Patent application that is assignee of the present invention, incorporates into reference at this.
U.S. Patent application, sequence number 09/803,173, exercise question are " can pass through USB joint and the direct-connected portable data storage device of computing machine "; U.S. Patent application, sequence number 09/803,157, exercise question are " portable data storage device that has safe mode in operation "; U.S. Patent application, sequence number 09/898,365, exercise question are " portable set with biological characteristic authentication function "; And U.S. Patent application, sequence number 09/898,310, exercise question are " portable set with biological characteristic authentication function ".
Technical field
The present invention relates to field that electronic data is stored.More particularly, the present invention relates to compression and decompression to the data of in portable data storage device, storing.
Background technology
Portable memory apparatus is called as " key chain " memory device or Thumbdrives sometimes
TM(this trade mark belongs to the assignee of the present invention) all is the small portable data storage device.These equipment have become the indispensable computer peripheral of a class, and they are in commercial affairs, and education and family expenses are used widely in calculating.These equipment and other data storage device are compared as personal computer (PC), PDA(Personal Digital Assistant), disk or CD (CD), and be more small and exquisite.Really, this name of " key chain " memory device illustrates that these equipment are more or less the same with key dimensionally.Portable data storage device can permanently not be installed on a specific host platform usually, as personal computer.On the contrary, they can be easily connect with the computing machine with the suitable connectivity port serial bus port of USB port or IEEE1394 (" live wire ") port etc. (for example, as) and remove from computing machine.Like this, these equipment can make the user in different intercomputer Data transmission; Non-this, these computing machines can't connect.Because these equipment use non-volatile solid state memory (for example flash memory) as storage medium, they do not need the gearing of movable parts or machinery to carry out the access of data.Do not have gearing to make portable data storage device with comparing as the surface storage devices of disk or CD etc., structure is compact more.Equally, owing to there are not movable parts, faster to the read-write of the read-write comparison disk of the storer of these memory devices or CD.Portable data storage device also has more large storage capacity than disk.But portable data storage device outfit as many as 256M byte, disk then are the 1.4M byte.
Although data storage has been proved to be way of great use in portable memory apparatus, just can't not store more substantial data owing to do not increase the size of these equipment, the use of these equipment is restricted.
Summary of the invention
Thereby, the purpose of this invention is to provide a kind of system and equipment, so that the user can deposit the more substantial data that allow above prior art in portable data storage device.This will make manufacturer increase storable data total amount in the storer of these equipment, and need not to increase the size of storer, thereby need not to increase the size of these equipment.In addition, this also has additional benefits, and it can make manufacturer reduce the size of these equipment and need not the data total amount that minimizing equipment can be stored.
According to a first aspect of the present invention, a kind of single portable data storage device is provided, it has a general-purpose serial bus USB connector that is applicable to memory device, this equipment can directly be connected with computing machine so that with the form of packet reception data, this memory device comprises: the flash memory with one first memory capacity by this connector; And data compression engine, this data compression engine can compress each packet of storing in flash memory so that generate the data of compressed data packet form respectively, so that the memory capacity of flash memory surpasses described first memory capacity.
According to a second aspect of the present invention, a kind of method of compressing data is provided, this method comprises following step: the communication port that a) by universal serial bus connector portable data storage device is directly connected in host platform; B) form with data packet stream receives data from PORT COM; C) data compression engine of executive resident in described portable data storage device; D) compression is distinguished compressed data packet by the described packet that main frame provides to generate; And e) compressed data packet is stored in the storer of described portable data storage device.
According to a third aspect of the present invention, a kind of method that compressed data packet in the storer that is stored in portable data storage device is decompressed is provided, and this method comprises following step: the communication port that a) by general-purpose serial bus USB described portable data storage device is directly connected in personal computer; B) data compression/decompression of executive resident in the described portable data storage device engine that contracts; And c) from the storer of described portable data storage device, reads through compressed data packet; D) packet that packet is decompressed and decompresses respectively to generate; And e) packet that decompresses is sent to host platform.
The present invention can reach above-mentioned these purposes and other purpose; The present invention includes a portable data storage device, this portable storage device can be passed through USB port, IEEE1394 port or similar port and host platform, as personal computer, connects easily.Comprise flash memory in this equipment, ROM (read-only memory) (ROM), random-access memory (ram), USB controller and a microcontroller.In addition, in portable data storage device, also comprise a data compression and decompression engine, in storer, store and during reading of data, data are carried out compression/de-compression with box lunch.
Portable data storage device (Thumbdrive
TM) by in the USB port that USB connector is inserted into personal computer and and host platform, as personal computer (PC), connect.Desiring to be stored in the data in the portable data storage device, is to be sent in the workspace cache device of portable data storage device by the form of personal computer with packet.Compression engine reading of data and each packet compressed from buffer.Compressed packet is stored in the flash memory.For reading of data, compression/de-compression engine decompresses from the flash memory reading of data and with it.Decompression engine places the workspace cache device with the data that decompress, and data are sent to host platform from buffer then.
In typical case, compression/de-compression engine is arranged in ROM (read-only memory), carries out yet upload in the microcontroller.In another alternative embodiment, compression/de-compression engine is arranged in application-specific IC (ASIC) chip of portable data storage device.
The user can't aware the compression/de-compression function of this portable data storage device.User storage data, but and do not know that data are compressed.In another alternative embodiment, the user can understand these functions, and can enable/forbid compression function according to its wish.Forbid that compression function can accelerate the speed of data storage.
Description of drawings
According to the embodiment of following the preferred embodiments of the present invention and with reference to the accompanying drawings, can clear and definite purpose of the present invention, function and advantage.
Fig. 1 is a block diagram, and it has illustrated each functional block and the visual texture thereof of an embodiment of the portable memory apparatus according to the present invention.
Fig. 2 is a process flow diagram, and it has illustrated how host platform transmits an order to portable memory apparatus.
Fig. 3 is a process flow diagram, and it has illustrated how data send, and compresses and is stored in the storer of portable memory apparatus.
Fig. 4 is a process flow diagram, and it has illustrated how the data in the storer that is stored in portable memory apparatus are carried out access.
Embodiment
Here, the present invention will be described in more detail with reference to the accompanying drawings, shown the preferred embodiment of the invention in the accompanying drawings.Yet the present invention can implement by different forms, and the embodiment that should not be understood that to be subject to herein and proposed; On the contrary, providing these embodiment is in order to make this paper fully, comprehensively and intactly express the present invention to those skilled in the art.In fact, replacement form, forms of modification and the equivalents of these embodiment contained in the present invention, and these all are contained in the present invention's who determines in the appending claims protection domain and purport.In addition, in the specific embodiment of the present invention subsequently, listing numerous specific detail is to have one to understand more fully in order to help to the present invention.But one of ordinary skill in the art should be understood, need not these specific details and can implement the present invention.In other embodiments, known method, flow process, element and circuit are not described in detail, in order to avoid cause unnecessary obscuring to various aspects of the present invention.
The block diagram illustrations of Fig. 1 the functional block and the visual texture thereof of an embodiment of portable memory apparatus according to the present invention and system.Fig. 1 has shown portable memory apparatus 100 (small hand held devices that is fit to be held in the hand), this equipment is through USB (universal serial bus) (USB) port connector, and IEEE1394 (being live wire) connector or other port connector 140 are connected with the USB port (or similar port) 192 of host platform 195 (for example personal computer).In a preferred embodiment, need not intercommunicating of electric wire or cable can realize connecting.Host platform 195 links to each other with the power circuit 150 that is positioned at portable set inside.Power circuit 150 obtains energy from host platform, and as the power supply of each element in the portable set 100.
Still with reference to figure 1, portable memory apparatus comprises a microcontroller 160, flash memory 180, and a compression/de-compression engine 190.Obviously, microcontroller 160 also can be a general purpose microprocessor.
In one embodiment, workspace cache device 165 is positioned at microcontroller.In another alternative embodiment, workspace cache device 165 is positioned at (for example, among random access memory 120) outside the microcontroller 160.In a preferred embodiment, the capacity of workspace cache device is the 16K byte.
Be to be appreciated that the data compression/decompression engine 190 that contracts can use a plurality of methods and realize that these methods all are within protection scope of the present invention.In one embodiment, compression/de-compression engine 190 can be realized by the firmware of storage in the nonvolatile memory 110 in the portable set 100.In another embodiment, the data compression/decompression engine 190 that contracts can be realized by the part of microcontroller 160.Also have among the embodiment, compression/de-compression engine 190 can be realized by the processor that is separated with microcontroller 160.In other words, in protection scope of the present invention, compression/de-compression engine 190 does not need to be fixed in a certain privileged site of portable set 100.On the contrary, lay compression/de-compression engine 190 wherein and can select according to design, like this, just for adapting to the dirigibility of using different applicable cases of the present invention that design is provided.
After host platform 195 was sent to portable memory apparatus 100, the data compression/decompression 190 pairs of data of engine that contract were compressed in data.Data are transmitted through usb bus with the form of packet.Data compression/decompression engine 190 reading of data (being to read a sector each time in typical case) and data are compressed from workspace cache device 165 that contracts.In a preferred embodiment, data compression is to 50% of original size.Thereby size is that the packet of 512 bytes will be compressed into 256 bytes.After the compression, data storage is in flash memory 180.Compression/de-compression engine 190 is also carried out decompress(ion) and is contractd data transmission to host platform 195 being stored in data in the flash memory 180.
In this embodiment, portable set comprises a USB device controller 130, and it is used to control communicating by letter between portable set 100 and the host platform 195, and the personal computer of the latter such as compatible USB wherein has USB master controller 197.
Still with reference to figure 1, portable set 100 also comprises a volatile memory 120 and a nonvolatile memory 110.In a preferred embodiment, volatile memory 120 is random-access memory (ram)s, and it is as the working storage of microcontroller 160 when working.In this embodiment, nonvolatile memory 110 is ROM (read-only memory) (ROM), and it can be used for storing firmware, and the latter can finish the difference in functionality of portable memory apparatus 100.
In addition, in this embodiment, portable set 100 comprises a write-protect switch 170, when it is opened, can start microcontroller 160 and forbids write-access to flash memory 180.Should be noted that the same with compression/de-compression engine 190, write-protect switch can adopt a plurality of methods to realize that these methods all are within the protection domain of the present invention.Write-protect switch 170 can be realized by the following method: application software (as the firmware of in nonvolatile memory, storing) for example, and as the part of microcontroller 160, or as the processing unit that is separated with microcontroller 160.In alternative, write-protect switch can be a hand switch, and it can be by user's manual operation.
In currently preferred embodiments as described in Figure 1, microprocessor 160 is being controlled each element of portable set 100, comprise USB device controller 130, ROM (read-only memory) (ROM) 110 and random-access memory (ram) 120 execution of firmware code wherein (and be stored in).
Selection in addition is, portable set 100 further comprises a USB port (not shown), and it can provide a kind of performance easily, by USB other one or more USB compatible equipments is connected with this portable set making it.
In one embodiment, drive software (not shown), application programming interfaces (API) and watchdog routine (not shown) all reside at host platform 195 and get in touch with mutually with USB master controller 197, so that portable set 100 is operated.
Described the structure of portable data storage device in two following U.S. Patent applications: the sequence number of an application is 09/898,365, and exercise question is " portable set with biological characteristic authentication function ", submits to July 3 calendar year 2001; The sequence number of another application is 09/830,173, and exercise question is " can pass through USB joint and the direct-connected portable data storage device of computing machine ".
The flow chart description of Fig. 2 the operation that when the user is connected (step 205) with portable set 100 with host platform 195 and begin to portable set 100 storage data, is taken place.In step 205, when with after host platform 195 is connected, portable set 100 carries out initialization procedure.In currently preferred embodiments, initialization procedure relates to be set up contact with host platform 195 and guarantees that host platform 195 knows that portable set 100 is coupled.Host platform 195 is by sending request package to USB master controller 197 and serving from portable set 100 requests.USB master controller 197 sends request package by USB port 192 to USB connector 140.Portable set 140 is finished operations then, as sense data from flash memory 180, write data or deleted data to it, simultaneously with compression and decompression to data.
In step 210, host platform 195 can send request with the form of write command to portable memory apparatus 100, so that write data to flash memory 180.In step 215, USB controller 130 receives write command.In typical case, write command has indicated the number of the packet that will store subsequently.
The flow chart description of Fig. 3 when data transmission to portable set so that compression and the operation that takes place when being written in the flash memory 180.Host platform 195 is sent to USB controller 130 (step 303) with first packet.In one embodiment, according to the USB2.0 standard, each packet is corresponding to the sector or 512 bytes of storer.In alternative embodiment, according to the USB1.1 standard, each packet is 64 bytes.
Microcontroller 160 is carried out compression/de-compression engine 190 (step 315).Compression/de-compression engine 190 is operated the packet that is stored in the workspace cache device 165 by the scheme of " first in first out ", whereby, packet compresses in the order of workspace cache device 165 storages according to them, the packet that is stored in workspace cache device 165 like this, at first will be compressed and be transferred at first flash memory 180 at first.In a preferred embodiment, data are compressed into 50% of original size.In a preferred embodiment, when operating according to the USB2.0 standard, compression engine 190 is operated the data of a sector of compression (512 byte) each time.In alternative embodiment, when operating according to the USB1.1 standard, compression engine 190 is operated the data of compression 64 bytes each time.Compressed data storage is in flash memory 180 (step 325).
Memory map is by microcontroller 160 controls.In a preferred embodiment, host platform (and user) and do not know that data are compressed.For host platform, data are as not being compressed the sector (being that each sector has the not compressed data of 512 bytes) of filling flash memory 180.Like this, the packed data that writes first sector just looks like to have filled up whole sector for master controller.In fact, data are compressed to 256 bytes from 512 bytes, and data when not being compressed half between required sector null just can store these data.Like this, second packet after 512 bytes are compressed to 256 bytes, also is stored in first sector.For master controller, in fact be stored in second packet of first sector, seem to just look like to be stored in second sector.Equally, first packet that is stored in second sector will seem as being stored in the 3rd sector, and second packet that is stored in second sector will seem as being stored in the 4th sector.
In typical case, take 2 bit-errors to detect and 1 bit correction mechanism (2bit error detection and 1bit correction mechanisms).
If there is other packet, master controller 195 just sends this packet (step 335 and 303) to USB controller 130.Data compression engine 190 continues to be compressed in the other packet (step 320) of storage in the workspace cache device 165.When not needing compressed data packet, data compression and storing process finish.
The step that Fig. 4 has described from the storer of portable data storage device reading of data and decompressed.
In step 410, the user is connected portable set 100 with host platform 195.In step 410, when portable set with after host platform 195 is connected, portable set 100 carries out aforesaid initialization procedure.Host platform 195 passes through to send request package to USB master controller 197, and from portable set 100 request services.USB master controller 197 sends request package by USB port 192 to USB connector 140.
In step 430, microcontroller 160 is carried out compression/de-compression engine 190.Compression/de-compression engine 190 reads institute's requested packets (step 445) from flash memory 180.190 pairs of data of compression/de-compression engine decompress (step 447).Be sent to workspace cache device 165 (step 450) through the data that decompress.Be sent to USB controller 130 (step 455) through the data that decompress.In step 460, packet is sent in the storer (for example random access memory) of host platform 195.
Selection in addition is that host platform 195 sends request to portable set 100, to read out in the catalogue of the data of storage in the flash memory 180.The user just can observe catalogue on host platform 195 then, wishes to read which data to determine him from flash memory 180.
Obviously, top description only relates to preferred embodiment of the present invention.Man of skill person can design other device and not depart from purport of the present invention and protection domain in the art.Thereby the present invention only is subject to appending claims.
Claims (7)
1. single portable data storage device, it has a general-purpose serial bus USB connector that is applicable to memory device, and this equipment can directly be connected with computing machine so that with the form reception data of packet, this memory device comprises by this connector:
Flash memory with one first memory capacity; And
A data compression engine,
This data compression engine can compress each packet of storing in flash memory so that generate the data of compressed data packet form respectively, so that the memory capacity of flash memory surpasses described first memory capacity.
2. single portable data storage device as claimed in claim 1, it further comprises a data decompression engine, this decompression engine can decompress to the data of storing in the storer of portable set.
3. single portable data storage device as claimed in claim 1, wherein each packet is compressed into 50% of original size.
4. single portable data storage device as claimed in claim 1, wherein this data compression engine can and be forbidden by user's startup.
5. method of compressing data, this method comprises following step:
A) portable data storage device is directly connected in the communication port of host platform by universal serial bus connector;
B) form with data packet stream receives data from PORT COM;
C) data compression engine of executive resident in described portable data storage device;
D) compression is distinguished compressed data packet by the described packet that main frame provides to generate; And
E) compressed data packet is stored in the storer of described portable data storage device.
6. method as claimed in claim 5, wherein compression step comprises each packet is compressed to 50% of original size.
7. method that the compressed data packet in the storer that is stored in portable data storage device is decompressed, this method comprises following step:
A) described portable data storage device is directly connected in the communication port of personal computer by general-purpose serial bus USB;
B) data compression/decompression of executive resident in the described portable data storage device engine that contracts; And
C) from the storer of described portable data storage device, read through compressed data packet;
D) packet that packet is decompressed and decompresses respectively to generate; And
E) packet that decompresses is sent to host platform.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610065823 CN1822204B (en) | 2002-05-13 | 2002-05-13 | System and device for compressing and decompressing stored data in portable data storage device |
| HK06111333.7A HK1094832A1 (en) | 2002-05-13 | 2006-10-16 | System and method for compressing and decompressing data stored to a portable data storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610065823 CN1822204B (en) | 2002-05-13 | 2002-05-13 | System and device for compressing and decompressing stored data in portable data storage device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA028250737A Division CN1605069A (en) | 2002-05-13 | 2002-05-13 | System and equipment for compressing and decompressing data in portable data storage device |
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| Publication Number | Publication Date |
|---|---|
| CN1822204A CN1822204A (en) | 2006-08-23 |
| CN1822204B true CN1822204B (en) | 2010-10-13 |
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| CN 200610065823 Expired - Fee Related CN1822204B (en) | 2002-05-13 | 2002-05-13 | System and device for compressing and decompressing stored data in portable data storage device |
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| CN (1) | CN1822204B (en) |
| HK (1) | HK1094832A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012794A (en) * | 2010-11-19 | 2011-04-13 | 北京兆易创新科技有限公司 | Solid state disk and access control method thereof, and solid state disk controller |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6173355B1 (en) * | 1998-01-07 | 2001-01-09 | National Semiconductor Corporation | System for sending and receiving data on a universal serial bus (USB) using a memory shared among a number of endpoints |
-
2002
- 2002-05-13 CN CN 200610065823 patent/CN1822204B/en not_active Expired - Fee Related
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- 2006-10-16 HK HK06111333.7A patent/HK1094832A1/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6173355B1 (en) * | 1998-01-07 | 2001-01-09 | National Semiconductor Corporation | System for sending and receiving data on a universal serial bus (USB) using a memory shared among a number of endpoints |
Non-Patent Citations (1)
| Title |
|---|
| US 6173355 B1,全文. |
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| Publication number | Publication date |
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| HK1094832A1 (en) | 2007-04-13 |
| CN1822204A (en) | 2006-08-23 |
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