WO2006038260A1 - Systeme de stockage usb et dispositif de stockage usb - Google Patents

Systeme de stockage usb et dispositif de stockage usb Download PDF

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Publication number
WO2006038260A1
WO2006038260A1 PCT/JP2004/014357 JP2004014357W WO2006038260A1 WO 2006038260 A1 WO2006038260 A1 WO 2006038260A1 JP 2004014357 W JP2004014357 W JP 2004014357W WO 2006038260 A1 WO2006038260 A1 WO 2006038260A1
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WO
WIPO (PCT)
Prior art keywords
usb
function
hosts
host
storage system
Prior art date
Application number
PCT/JP2004/014357
Other languages
English (en)
Japanese (ja)
Inventor
Shinichi Suzuki
Atsuyuki Ikeya
Original Assignee
Renesas Technology Corp.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renesas Technology Corp. filed Critical Renesas Technology Corp.
Priority to JP2006539091A priority Critical patent/JPWO2006038260A1/ja
Priority to PCT/JP2004/014357 priority patent/WO2006038260A1/fr
Publication of WO2006038260A1 publication Critical patent/WO2006038260A1/fr

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Classifications

    • 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
    • G06F3/0659—Command handling arrangements, e.g. command buffers, queues, command scheduling
    • 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
    • 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
    • G06F3/0629—Configuration or reconfiguration of storage systems
    • G06F3/0637—Permissions
    • 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]

Definitions

  • the present invention relates to a USB (Universal Serial Bus) storage system and a USB storage device, and more particularly to a technology effective when applied to a USB storage system and a USB storage device that are connected to a plurality of hosts. is there.
  • USB Universal Serial Bus
  • USB storage system According to a study by the present inventor, the following technologies can be considered for the USB storage system.
  • USB storage devices that handle external media such as memory cards and floppy disks (registered trademark) as removable disks due to their ease of use with plug-and-play functions and improved data transfer speed according to the USB 2.0 standard
  • USB reader / writers There are many (hereinafter referred to as USB reader / writers).
  • FIG. 10 is a schematic diagram showing an example of the configuration of the USB storage system of the technology studied as the premise of the present invention, and (a) to (c) show different configuration examples.
  • FIG. 10 (&) 113 1 I cable 102 Nyo; 38 USB writer 101a which is connected to the host 1 3 Ji 100, one such as an SD (Secure Digital) memory card or floppy disk External media can be inserted.
  • Fig. 10 (b) a plurality of different types such as USB reader / writer 101b force CF (CompactFlash (registered trademark)) card, SD memory card and Memory Stick (registered trademark) connected in the same way as in Fig. 10 (a).
  • External media [1], [2], ..., [N] can be inserted.
  • the USB reader / writer 101c connected in the same way as in Fig. 10 (a) is connected to multiple external media [1], [2] of the same type that have MMC (MultiMediaCard (registered trademark)) card power. , ..., [N] can be inserted.
  • MMC MultiMediaCard (registered trademark)
  • USB host PC the correspondence between the USB host PC and the external media is one-to-one or one-to-many. Therefore, for example, when an external medium having a user power using a plurality of PCs is used on a plurality of PCs (USB host PCs), for example, an operation as shown in FIG.
  • FIG. 11 is a diagram for explaining the work contents when a specific external medium is used by a plurality of USB host PCs in the USB storage system of the technology studied as the premise of the present invention.
  • the work is performed after using external media on the USB host PC [l] 110a, connect to the USB host PC [1] 110a !, disconnect the USB cable 112 (S110), and connect the USB cable to the USB host PC [2] 112 Is connected (S111), the work is performed.
  • an object of the present invention is to provide a USB storage system and a USB storage device capable of improving time efficiency when used by a plurality of hosts.
  • Another object of the present invention is to provide a USB storage system and a USB storage device that can save power when used by a plurality of hosts.
  • a USB storage system includes a plurality of USB hosts and a USB function including a function as an external storage medium, and data transfer based on the USB protocol between the USB function and the plurality of USB hosts. Is to do.
  • the USB function has a function that enables a plurality of USB hosts to perform shared access to the USB function external storage medium in a state where a plurality of USB hosts are connected to the USB function. It becomes something.
  • USB function as an external storage medium when used by multiple USB hosts, work and processing such as reconnection of the USB cable and initialization associated therewith are not required, and time efficiency is improved. It is possible to improve the power consumption.
  • the function that enables the shared access is performed, for example, by one USB host among a plurality of USB hosts executing a process of writing to the external storage medium of the USB function. While there are multiple USB hosts, it includes a function to reject write requests from other USB hosts.
  • the plurality of USB hosts include a first USB host and a second USB host, and the function of enabling the shared access is a USB function generated by the first USB host. If a second write request for the external storage medium is generated from the second USB host during the processing of the first write request for the external storage medium, the second USB host It includes a function that notifies the rejection of the write request and continues the processing of the first write request! / Speak.
  • the function of the USB function as an external storage medium is realized by, for example, a memory card. As a result, it is possible to reduce the memory card initialization process, which has been required every time the USB cable is reconnected, improving the time efficiency and saving power.
  • the USB storage system includes a plurality of USB hosts and a USB function including a function as an external storage medium.
  • the function of rejecting the write request is realized by a program process by a computer provided in the USB function, and the program process is a write request to the external storage medium from the one USB host.
  • a step of notifying the other USB host of rejection of the generated write request when the request is generated that is, by adding a function for rejecting the write request to the software, it becomes possible to easily realize sharing of an external storage medium by a plurality of USB hosts.
  • the step of notifying the rejection of the write request can be performed using data of a request sense command, for example.
  • the USB storage device of the present invention includes a plurality of USB connector terminals connected to a plurality of USB hosts, and a media connector terminal connected to an external storage medium, and the plurality of the plurality of USB connector terminals based on a USB protocol. Data transfer to and from a USB host is possible, and a plurality of USB hosts are connected to the plurality of USB connector terminals and an external storage medium is connected to the media connector terminal.
  • the US B host has a function that enables shared access to external storage media.
  • examples of the external storage medium include a memory card.
  • the USB storage device includes a plurality of media connector terminals, and a plurality of the same type or different types of memory cards are connected to the plurality of media connector terminals. You may make it.
  • the USB storage device can be provided with a bridge function that can arbitrarily set the connection between the plurality of USB connector terminals and the plurality of media connector terminals.
  • USB function having a function as an external storage medium
  • a function for enabling shared access of the external storage medium by a plurality of USB hosts is provided.
  • the time efficiency when using the external storage medium by the B host can be improved, and power saving can be achieved.
  • FIG. 1 is a schematic view showing an example of the system configuration of a USB storage system according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing an example of a logical configuration of a USB host in the USB storage system of FIG.
  • FIG. 3 is a diagram showing an example of a logical configuration of a USB reader / writer in the USB storage system of FIG. 1.
  • FIG. 4 is a perspective view showing an example of the external shape of a USB reader / writer in the USB storage system of FIG.
  • FIG. 5 is an explanatory diagram showing an example of the operation outline of the USB reader / writer of FIG. 3.
  • FIG. 6 is a processing flowchart showing an example of interface software processing in the USB reader / writer of FIG. 3.
  • FIG. 7 is a process flow diagram for explaining an example of the operation in the system configuration of FIG.
  • FIG. 8 is a schematic diagram showing an example of a system configuration obtained by extending FIG. 1 in the USB storage system according to the embodiment of the present invention.
  • FIG. 9 is a schematic diagram illustrating an example of a configuration in which a plurality of external media can be shared by a plurality of USB hosts in a USB storage system according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram showing an example of the configuration of the USB storage system of the technology studied as a premise of the present invention, and (a) to (c) show different configuration examples.
  • FIG. 11 is a diagram for explaining work contents when a specific external medium is used by a plurality of USB host PCs in the USB storage system of the technology studied as a premise of the present invention.
  • FIG. 1 is a schematic diagram showing an example of the system configuration of a USB storage system according to an embodiment of the present invention.
  • the USB storage system shown in Fig. 1 is connected to multiple USB hosts consisting of, for example, USB host [1] 10a and USB host [2] 10b, and multiple USB hosts via USB cables 12a and 12b respectively. It consists of USB reader / writer 11 Typical examples of USB hosts include personal computers.
  • the USB reader / writer 11 is a USB storage device having a function as an external storage medium.
  • an external medium (external storage media) 13 such as a memory card or a floppy disk can be connected. It has become. Note that in Fig. 1, it is possible to apply 3 or more USB hosts. For simplicity, the following explanation assumes that there are 2 USB hosts.
  • FIG. 2 is a diagram showing an example of the logical configuration of the USB host in the USB storage system of FIG.
  • the USB host shown in Fig. 2 has an application layer, a system software layer, and a hardware layer from the upper layer to the lower layer.
  • the application layer includes application software 20.
  • Typical examples of the application software 20 include an explorer having a function for operating folders and files, and an audio play having a music data playback function. Yer.
  • the application layer sends and receives data to and from the system software layer.
  • the system software layer manages the hardware layer, and performs conversion based on the USB protocol on the transmission / reception data between the application layer and the hardware layer.
  • the system software layer includes a USB mass storage class driver 21a and a USB bus driver 21b.
  • the USB mass storage class driver 21a performs management of a command transport, a data transport, a status transport, and the like defined by a standard called a USB mass storage class.
  • the USB bus driver 21b performs processing common to each USB class, such as transaction management.
  • the hardware layer includes a USB host controller 22! /.
  • the USB host controller 22 is electrically connected to the USB reader / writer via the USB cable 23, and is a hardware that processes the USB host's electrical signals such as detecting the connection of the USB reader / writer and sending / receiving packets to / from the USB reader / writer. Wear.
  • the USB reader / writer 11 has a configuration as shown in FIG. 3 and FIG.
  • FIG. 3 is a diagram showing an example of the logical configuration of the USB reader / writer in the USB storage system of FIG.
  • FIG. 4 is a perspective view showing an example of the outer shape of the USB reader / writer in the USB storage system of FIG.
  • the USB reader / writer shown in FIG. 3 includes, for example, a USB function module [1] (hereinafter, USB module [1]) 30 and a USB function module [2] (hereinafter, USB module [2]) 31. Includes 2 USB function modules, external media module 32, interface software (hereinafter referred to as interface software) 33, etc.
  • the USB module [1] 30 includes a USB mass storage class firmware [1] 30a that is software and a USB function controller [1] 30b that is hardware, and a USB host [1 ] Etc.
  • the USB module [2] 31 includes a USB mass storage class firmware [2] 31a and a USB function controller [2] 3 lb, and is connected to a USB host [2], etc. via a USB cable 12b.
  • the external media module 32 includes an external media firmware 32 a that is software and an external media host controller 32 b that is hardware, and is connected to the external media 13.
  • the application layer includes interface software 33.
  • the interface software 33 is software that controls data transfer between the USB modules [1] 30, [2] 31 and the external media module 32.
  • the interface software 33 further has a function of performing a response process when a write request is generated from the other USB module during a response process of a write request from one USB module to the external medium 13.
  • the interface software 33 is stored in, for example, a ROM or the like provided in the USB reader / writer, and the interface software 33 is executed by, for example, a microcomputer and a RAM provided in the USB reader / writer. The same applies to various software in the system software layer described later.
  • the system software layer includes USB mass storage class firmware [1] 30a, [2] 31a and external media firmware 32a.
  • USB mass storage class firmware [1] 30a (or [2] 31a) controls the USB function controller [1] 30b (or [2] 31b) and performs processing specific to the USB mass storage class.
  • the external media firmware 32a performs transaction management of the external media 13 and control of the external media host controller 32b.
  • the hardware layer includes a USB function controller [1] 30b, [2] 31b and an external media host controller 32b.
  • USB function controller [1] 30b, [2] 3 lb processes USB function electrical signals such as packet transmission and reception.
  • the external media host controller 32b performs electrical signal processing such as command transmission to the external medium 13, reception of a response from the external medium 13, and data transmission / reception with the external medium 13.
  • Such a USB reader / writer has an outer shape as shown in FIG. 4, for example.
  • a housing 40 is provided with two USB connectors [l] 41a, [2] 41b and an external media connector (external media slot) 42.
  • the USB connectors [l] 41a and [2] 41b are USB function connectors, and are connected to the USB hosts [1] and [2] by USB cables 12a and 12b, respectively.
  • External media such as a memory card or floppy disk is inserted and connected to the external media connector 42.
  • the present invention is characterized in that the USB host [1] and the USB host
  • a USB reader / writer is provided with a plurality of USB modules, and the interface software is used to arbitrate when processing requests are simultaneously generated from a plurality of USB modules.
  • the function is realized. The details of the arbitration function of this interface software will be described below.
  • the request from the USB host to the USB reader / writer includes a request to write data to the external media memory (hereinafter referred to as a write request), a request to read data from the external media memory (hereinafter referred to as a read request), and a USB There is a request to acquire the status and information of the reader / writer (hereinafter referred to as status acquisition request).
  • the request from the USB host and the corresponding processing of the USB reader / writer in response to the request do not overlap in time, or the memory contents of the external media are not changed even if they overlap
  • the data stored in the external media can be stored by using exclusive control such that the USB reader / writer's interface software does not overlap with each other's requests and external media.
  • the problem occurs when two USB hosts are used when a write request is issued from another USB host during processing of a write request from a USB host that has USB reader / writer capabilities. Therefore, for example, this problem is avoided by the following operation.
  • the USB reader / writer receives a write request from another USB host (USB host [1]) during the processing of a write request from a USB host (USB host [2]). If the request is received, the request from the USB host [1] is rejected and the write request from the USB host [2] is rejected. Continue handling. In other words, the operation outline is as shown in FIG.
  • FIG. 5 is an explanatory diagram showing an example of the operation outline of the USB reader / writer of FIG.
  • the interface software 33 in the USB reader / writer receives a write request [2] from the USB module [2] 31, it returns an acceptance response to the USB module [2] 31 and writes to the external media module 32. Send data corresponding to request [2].
  • the interface software 33 virtually transmits to the USB module [1] 30. Notify that the external media 13 is in operation and reject the request from the USB host [1].
  • FIG. 6 is a process flow diagram showing an example of interface software processing in the USB reader / writer of FIG.
  • the interface software 33 is activated after the external medium 13 is connected or after the USB cable 12a (or 12b) is connected (S601), and enters an event waiting state.
  • the events received by interface software 33 include USB module (US B module [1] 30 or USB module [2] 31) powerful read requests and write requests, and read completion notifications from external media module 32 (interface software Read completion notification corresponding to 33 read requests) and write completion notification (write completion notification corresponding to interface software 33 write request).
  • the USB module [1] 30 (or [2] 31) has a read request while waiting for an event (S602)
  • the content of the read request is analyzed and lead identification information is created (S603).
  • the lead identification information is used to identify read requests when multiple read requests overlap.
  • the lead identification information includes a read request ID, a USB module number for identifying the requested USB module, a read address, and a read size force.
  • a read request is made to the external media module 32 (S604). Next, it shifts to the event waiting state.
  • the operation status flag is a flag indicating that writing to the external media 13 is in progress. This is used for exclusive control so that the writing process to the external medium 13 does not overlap, and the initial value is OFF.
  • the operation status flag is ON, an operation status notification is created and sent to the corresponding USB module [1] 30 (or [2] 31) to reject the write request (S607). On the other hand, if the operation status flag is OFF, the operation status flag is turned ON (S608). Thereafter, a write request is made to the external media module 32 (S609). Next, it shifts to an event waiting state.
  • the state of the external medium 13 is checked (S615), and if the external medium 13 is removed, the process is terminated. If it has not been removed, the event waiting state is continued.
  • USB reader / writer that supports plug-and-play and other features such as USB and memory cards can be realized.
  • Re-initializing external media such as SD memory cards can be omitted. As a result, the time efficiency can be improved and the power can be saved.
  • FIG. 2 is a process flow diagram for explaining an example of the operation in the system configuration of 1.
  • FIG. 2 The following describes an example of processing when the USB host [1] 10a transmits a data write request to the USB reader / writer 11 while the USB host [2] 10b in FIG. 1 is writing data.
  • data transfer conforming to the generally known USB mass storage standard shall be performed.
  • description will be made in association with the processing numbers in FIG.
  • USB reader / writer 11 When the USB reader / writer 11 receives the write [2] request CBW, it analyzes the number of data in the write address. Also, write [2] request CBW is converted to the command format specific to external media 13. That is, protocol conversion is performed.
  • the USB reader / writer 11 issues a write [2] command converted into the specific command format to the external medium 13.
  • USB host [2] 10b transmits the write [2] data to the USB reader / writer 11 in the format defined by the USB mass storage class.
  • the USB reader / writer 11 Upon receiving the write [2] data, the USB reader / writer 11 converts the write [2] data into a data format specific to the external media 13. That is, protocol conversion is performed.
  • the USB reader / writer 11 writes the converted write to the external medium 13.
  • the USB host [l] 10a issues a write defined by the USB mass storage class [1] CBW to the USB reader / writer 11 to write data to the memory of the external media 13 To do.
  • the USB reader / writer 11 is able to receive the write [1] request CBW.
  • Host [2] 10 b write [2] The request is being processed, so the USB host [1] 10a
  • write [1] rejects the request. That is, an operation state notification for notifying that the external media 13 is virtually in an operation state is created by the processing of the interface software 33 described above.
  • the ASC Additional Sense Code
  • H and ASCQ Additional Sequence Code Qualifier
  • the request sense command data is data returned to the host when the USB host generates a request sense command to the USB reader / writer.
  • the USB reader / writer 11 After the completion of the operation status notification, the USB reader / writer 11 transmits the operation status notification (request sense command data in this case) to the USB host [l] 10a.
  • USB host [l] 10a When the USB host [l] 10a receives the operation state notification, the USB host [1] 10a recognizes that data cannot be written to the memory of the external medium 13 and notifies the host application or the like.
  • the external medium 13 notifies the USB reader / writer 11 of the completion of the writing of the converted write [2] when the data writing is completed.
  • CSW is a bucket that is defined in the USB mass storage class and used when the USB host acquires the execution results for the CBW with the USB function.
  • USB reader / writer 11 writes to USB host [2] 10b [2] Complete CS
  • USB host [2] 10b receives the write [2] completion CSW, recognizes that the write operation has ended, and completes the write operation.
  • FIG. 8 is a schematic diagram showing an example of a system configuration in which FIG. 1 is expanded in the USB storage system according to the embodiment of the present invention.
  • USB reader / writer
  • N USB hosts are connected to the USB reader / writer 82, N different external media such as CF cards, SD memory cards, and memory sticks can be shared by the N USB hosts. .
  • N external media of the same type. This makes it possible to increase the efficiency of connection work and initial setting operation by N times compared to a normal UBS storage system.
  • FIG. 9 is a schematic diagram illustrating an example of a configuration in which a plurality of external media can be shared by a plurality of USB hosts in the USB storage system according to the embodiment of the present invention.
  • the bridge function 92 includes a dip switch for each of the plurality of USB connectors [1] 90a— [N] 90 ⁇ and the plurality of external media connectors [1] 91a— [N] 9 In.
  • it can be realized by adding a selection function to the interface software 33 on the USB reader / writer.
  • the bridge function 92 By using such a configuration, it is possible to arbitrarily select the connection between the USB host and the external medium, such as 1 to 1, 1 to N, N to 1, or N to N. Become.
  • the USB cable reconnection work required in the past can be replaced with the ONZOFF work of the dip switch. It becomes possible.
  • the USB storage system of the present invention is particularly useful when applied to a system in which the USB function is a USB reader / writer compatible with various memory cards such as an SD memory card and a memory stick. This is not limited to this, but can be widely applied to systems equipped with a USB reader / writer that supports floppy disks and hard disks.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Information Transfer Systems (AREA)

Abstract

L’invention concerne, par exemple, une pluralité d’hôtes USB comprenant un hôte USB [1] (10a) et un hôte USB [2] (10b) ; et un lecteur/scripteur USB (11) qui est connecté à un support externe (13), tel qu’une carte mémoire ou similaire, et qui peut également être connecté à la pluralité d’hôtes USB par l’intermédiaire de câbles USB respectifs (12a, 12b). Le logiciel ou similaire dans le lecteur/scripteur USB (11) comprend une fonction ou similaire pour rejeter une demande d’écriture d’un des hôtes USB pendant l’écriture sur le support externe (13) à partir de l’autre hôte USB. De cette façon, un accès partagé du support externe (13) par la pluralité d’hôtes USB peut être réalisé.
PCT/JP2004/014357 2004-09-30 2004-09-30 Systeme de stockage usb et dispositif de stockage usb WO2006038260A1 (fr)

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JP2006539091A JPWO2006038260A1 (ja) 2004-09-30 2004-09-30 Ｕｓｂストレージシステムおよびｕｓｂストレージデバイス
PCT/JP2004/014357 WO2006038260A1 (fr) 2004-09-30 2004-09-30 Systeme de stockage usb et dispositif de stockage usb

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JP2013232053A (ja) * 2012-04-27 2013-11-14 Buffalo Memory Co Ltd 外部記憶装置
US9179014B2 (en) 2009-06-24 2015-11-03 Canon Kabushiki Kaisha Information processing apparatus, and method for controlling the same

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JPH086890A (ja) * 1994-06-23 1996-01-12 Fujitsu Ltd 入出力制御システム
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Publication number Priority date Publication date Assignee Title
US9179014B2 (en) 2009-06-24 2015-11-03 Canon Kabushiki Kaisha Information processing apparatus, and method for controlling the same
JP2013232053A (ja) * 2012-04-27 2013-11-14 Buffalo Memory Co Ltd 外部記憶装置

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