JP2006338169A - Apparatus to be controlled and control apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To continue normal control operation by allowing a control device to recognize that a sub-unit type switch has been made in a device to be controlled in an IEEE 1394 system. <P>SOLUTION: Different characteristic values are set to a DISC sub-unit 131 and VCR sub-unit 132 mounted to the device to be controlled 121 respectively. An operation sub-unit switch part 141 sets a characteristic value of each sub-unit as identification information (GUID) of the device to be controlled and issues bus resets onto the IEEE 1394 serial buses 151 and 152 from a bus reset issue part 143 when switching to sub-units corresponding to control devices 101 and 111. The control device which has detected the bus reset discovers that the device to be controlled having new GUID is connected to the IEEE 1394 serial bus and performs control of the device to be controlled according to a command mounted to its own device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a controlled device (controlled device) and a control device (control device) that performs operation control of the controlled device, and more particularly, to an IEEE (Institute of Electrical and Electronic Engineers) 1394 system (IEEE 1394 standard and related items). The present invention relates to a controlled device and a control device that perform an operation based on standards and specifications.

  Conventionally, there is an AV (Audio Visual) recording / reproducing apparatus conforming to the IEEE 1394 serial bus. This AV recording / reproducing apparatus is an apparatus for recording / reproducing mainly on a tape medium such as a DV (Digital Video) camcorder or a D-VHS (Data Video Home System) recorder.

  However, with the recent widespread use of disk media such as DVD (Digital Versatile Disc), HDD (Hard Disk Drive), and BD (Blu-ray Disc), disk recording / playback devices that support the IEEE 1394 serial bus are also on the market. I'm starting.

  In the 1394 Trade Association, an AV / C command set (AV / C Digital Interface Command Set) for controlling these devices is defined. The specifications are defined as a VCR (Video Cassette Recorder: formally Tape Recorder / Player) subunit command for tape media and a DISC subunit command for disk media.

  Most of control devices such as STB (Set Top Box) and DTV (Digital TV) that control these recording / playback devices implement only the VCR subunit command. And few implement the DISC subunit command. For this reason, there are many devices in which a VCR subunit command is mounted and tape media is mounted, regardless of the disk recording / playback device.

On the other hand, various technologies have been proposed in connection with control conditions of a control device and a controlled device connected to a network such as the IEEE 1394 system. For example, in the following Patent Document 1, even when the application of the control device does not correspond to the subunit type of the controlled device, the controlled device can be set to the subunit type corresponding to the application of the controlled device. Techniques to do this are disclosed.
JP 2002-315077 A (FIG. 5)

  However, a problem in actual use arises only by the measures disclosed in Patent Document 1.

  For example, according to the technique disclosed in Patent Document 1, when a certain control device switches a controlled device from a VCR subunit to a DISC subunit, the control device issues a DISC subunit command from that point. The command can be normally exchanged between the controlled device and the controlled device switched to the DISC subunit.

  However, when the subunit type of the controlled device is switched in a situation where a certain controlling device does not intend (for example, when the controlled device side switches the subunit type alone, or when the subunit type of the controlled device is changed by another controlling device) In the case of switching, there is a problem in that the controlled device suddenly stops receiving the subunit command that has been received so far, and control from the controlling device cannot be performed normally. In such a state, there is currently only a coping method for returning to a normal control state by manually connecting and disconnecting the IEEE 1394 cable, but this coping method is troublesome for the user. In addition to requesting correct processing, transaction interruption may occur.

  In view of the above problems, an object of the present invention is to enable a control device to recognize that switching of a subunit type has been performed in a controlled device. In addition, the present invention is particularly suitable for all devices connected on the IEEE 1394 serial bus even when the controlled device switches the subunit type independently or switches the subunit type from the controlling device to the controlled instrument. It is intended to allow a device to recognize a change in the subunit type of its controlled device and to continue normal transactions with the changed subunit type.

In order to achieve the above object, according to the first aspect of the present invention, a controlled device including a subunit conforming to the IEEE 1394 scheme controlled by the control device compliant with the IEEE 1394 scheme via the IEEE 1394 serial bus. Because
A plurality of function realizing means for each subunit type for realizing a function of a plurality of subunit types assigned to the subunit by a subunit control command defined for each subunit type issued by the control device;
A function selecting means for selecting one function realizing means instructed as an object to be controlled by the control device from the plurality of function realizing means;
When it is detected that a bus reset signal is supplied via the IEEE 1394 serial bus, the function selection unit is controlled to select the function realization unit according to an instruction from the control device. A bus reset detecting means for
A controlled device is provided.

In order to achieve the above object, according to the second aspect of the present invention, an object mounted with a subunit conforming to the IEEE 1394 system, which is controlled via the IEEE 1394 serial bus by a control apparatus compliant with the IEEE 1394 system. A control device,
A plurality of function realizing means for each subunit type for realizing a function of a plurality of subunit types assigned to the subunit by a subunit control command defined for each subunit type issued by the control device;
A function selecting means for selecting one function realizing means instructed as an object to be controlled by the control device from the plurality of function realizing means;
A bus reset issuing means for issuing a bus reset signal via the IEEE 1394 serial bus when the function realizing means is selected by the function selecting means according to an instruction from the control device;
A controlled device is provided.

In order to achieve the above object, according to a third aspect of the present invention, there is provided a device in which a subunit conforming to the IEEE 1394 system, which is controlled via an IEEE 1394 serial bus by a control apparatus compliant with the IEEE 1394 system, is mounted. A control device,
A plurality of function realizing means for each subunit type for realizing a function of a plurality of subunit types assigned to the subunit by a subunit control command defined for each subunit type issued by the control device;
One function realization means instructed as an object to be controlled by the control device is selected from the plurality of function realization means, and an eigenvalue corresponding to the selected function realization means is selected for the control device. Function selection means for setting the identification information of the controlled device shown
A controlled device is provided.

  Furthermore, according to the fourth aspect of the present invention, in addition to the third aspect of the present invention described above, when it is detected that a bus reset signal is supplied via the IEEE1394 serial bus, the function There is provided a controlled device having a bus reset detecting means for controlling the selecting means so as to select the function realizing means according to an instruction from the control device.

  Further, according to the fifth aspect of the present invention, in addition to the third aspect of the present invention described above, the function realizing means is selected by the function selecting means in accordance with an instruction from the control device. In such a case, a controlled device having a bus reset issuing means for issuing a bus reset signal via the IEEE 1394 serial bus is provided.

In order to achieve the above object, according to the sixth aspect of the present invention, control according to the IEEE 1394 system for controlling a controlled device equipped with a subunit compliant with the IEEE 1394 system via an IEEE 1394 serial bus. A device,
Command issuing means for instructing one function among a plurality of subunit type functions assigned to the subunit as a target to be controlled by issuing a subunit control command defined for each subunit type;
A bus reset issuing means for issuing a bus reset signal via the IEEE 1394 serial bus when a change to the function instructed by issuing the subunit control command is accepted by the controlled device;
A control device is provided.

  The first aspect of the present invention is configured to issue a bus reset on the IEEE 1394 serial bus together with the selection of the function of the subunit type in a controlled device having a plurality of subunit types. The effect that the controlled device can recognize that the subunit type has been switched at the timing of the occurrence of the bus reset in conjunction with the switching of the subunit type, and the normal control operation can be continuously performed. have.

  The second aspect of the present invention is configured to detect a bus reset generated on the IEEE 1394 serial bus in addition to the selection of the function of the subunit type in a controlled device having a plurality of subunit types. The device can specify the switching timing of the subunit type in the controlled device at the timing of the bus reset generation in conjunction with the switching of the subunit type, and normal control operations will continue to be performed. Has an effect.

  The third aspect of the present invention is configured such that, in a controlled device having a plurality of subunit types, the function of the subunit type is selected and the identification information of the controlled device is switched to another eigenvalue. Therefore, even a control device that grasps the presence or absence of a newly connected controlled device by referring only to the eigenvalues of the controlled device can recognize that the subunit type has been switched in the controlled device. Thus, there is an effect that normal control operation is continuously performed. In addition, in the fourth and fifth aspects of the present invention, in particular, in a controlled device having a plurality of subunit types, a bus reset is issued on the IEEE 1394 serial bus together with the selection of the subunit type function, or Since the bus reset generated on the IEEE1394 serial bus is detected together with the selection of the function of the subunit type, the control device is connected to the subdevice in the controlled device at the timing of the bus reset generation linked with the switching of the subunit type. It is possible to recognize that the switching of the unit type has been performed, and there is an effect that normal control operation can be continuously performed.

  According to a sixth aspect of the present invention, in a control device that controls a controlled device having a plurality of subunit types, an instruction to change the function of the subunit type is given to the controlled device, and the instruction is sent to the controlled device. When the device is accepted, the control device is configured to issue a bus reset on the IEEE 1394 serial bus. Therefore, the control device detects the subunit type of the controlled device at the timing of the bus reset generated in conjunction with the switching of the subunit type. The switching timing can be defined, and the normal control operation is continuously performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, an example of the connection form of the IEEE 1394 serial bus in the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram illustrating an example of a connection form of a controlled device and a control device according to an embodiment of the present invention.

  The control devices 101 and 111 are controllers that control controlled devices (also called targets), and have an application for controlling the controlled devices. Here, the control device 101 implements only the VCR subunit command 102 in the AV / C command set, and the control device 111 receives the DISC subunit command 112 and the VCR subunit command 113 in the AV / C command. Implemented. As the control device 101 that implements only the VCR subunit command 102, for example, a DTV is assumed, and the control device 111 that implements both the DISC subunit command 112 and the VCR subunit command 113 is assumed. For example, a PC (Personal Computer) is assumed. The control devices 101 and 111 are equipped with IEEE 1394 communication units (communication units) 104 and 115, respectively, and are connected to the IEEE 1394 serial buses 151 and 152 via the IEEE 1394 terminals (connectors) 105 and 116, respectively. Here, the communication units 104 and 115 are blocks that perform link layer and physical layer processing conforming to the IEEE 1394 system.

  The commands implemented by the control devices 101 and 111 include a subunit type change command for requesting the controlled device 121 to change the subunit type. By transmitting this subunit type change command to the controlled device 121 so that the controlled devices 101 and 111 can control the operation of the controlled device 121 using commands implemented in the controlling devices 101 and 111 themselves. Subunit type change requests can be made.

  On the other hand, the controlled device 121 includes an IEEE 1394 communication unit (communication unit) 133 including IEEE 1394 terminals (connectors) 134 and 135, and is connected to the control devices 101 and 111 via the IEEE 1394 serial buses 151 and 152, respectively. These devices are controlled by these control devices 101 and 111. The controlled device 121 is assumed to be, for example, an HDD recorder (denoted as HDD in the drawing) capable of recording a moving image. The actual device is a DISC subunit 131, but a VCR subunit 132 impersonating a VCR. Is also implemented.

  In addition, the controlled device 121 includes an operation subunit switching unit 141 that switches a function of the controlled device 121 itself acting on the controller. The operation subunit switching unit 141 switches the DISC subunit 131 or the VCR subunit 132 as a function that acts on the controller.

  The subunit switching control by the operation subunit switching unit 141 may be performed from an external device such as a controller, or may be performed manually by the user of the controlled device 121. Further, the operation subunit switching unit 141 includes a command analysis unit 142 that analyzes the type of command received from the controller (whether it is a VCR subunit command or a DISC subunit command). It is also possible to automatically switch to a subunit corresponding to the command type from the controller in accordance with the command analysis result of the command analysis unit 142.

  Also, different GUIDs (Global Unique Identifier: device-specific numbers on the IEEE 1394 serial bus) are set in the DISC subunit 131 and the VCR subunit 132 of the controlled device 121, respectively. Then, in synchronization with the switching of the DISC subunit 131 and the VCR subunit 132 by the operation subunit switching unit 141, the GUID that is the unique number of the controlled device 121 is also switched to another value.

That is, normally, one unit (controlled device 121) has only one GUID. However, in the present invention, when the controlled device 121 operates as the DISC subunit 131 and the VCR subunit 132 operates. The controlled devices 121 operate as devices having different GUIDs. In the embodiment of the present invention, when the controlled device 121 becomes the DISC subunit 131,
GUID = 0x008088800 00000001
When the value of VCR subunit 132 is obtained,
GUID = 0x00808800 00000002
The value of

  In addition, the control devices 101 and 111 have bus reset detection units 103 and 114, respectively, and the controlled device 121 has a bus reset issue unit 143. The bus reset issuing unit 143 of the controlled device 121 has a function of issuing a bus reset on the IEEE 1394 serial buses 151 and 152, and the bus reset detecting unit 103 of the control device 101 and the bus reset detection of the control device 111. The unit 114 has a function of detecting a bus reset on the IEEE 1394 serial buses 151 and 152. Note that the bus reset is a device connected in IEEE 1394 when a new device is connected to the IEEE 1394 serial bus 151 or 152 or a device connected to the IEEE 1394 serial bus 151 or 152 is removed. These signals are output to reconstruct the above list, that is, initialization signals of the IEEE 1394 serial buses 151 and 152.

  The bus reset detection unit 103 of the control device 101 and the bus reset detection unit 114 of the control device 111 can detect all the bus resets on the IEEE 1394 serial buses 151 and 152. In this specification, the bus reset output from the bus reset issuing unit 143 to the IEEE 1394 serial buses 151 and 152 is called a bus reset issuing, and in addition to the bus reset output from the bus reset issuing unit 143, other The bus resets output on the IEEE 1394 serial buses 151 and 152 due to these factors are collectively referred to as the occurrence of a bus reset.

  In FIG. 1, the controlled device 121 is configured to issue a bus reset and the control devices 101 and 111 detect the bus reset. The bus reset may be issued and the controlled device 121 may be configured to detect the bus reset, and the object of the present invention is achieved even in such a configuration.

  Next, an example of the operation in each of the control devices 101 and 111 illustrated in FIG. 1 will be described. First, an example of the operation of the control device 101 illustrated in FIG. 1 (a control device in which only the VCR subunit command 102 is mounted) will be described. FIG. 2 is a flowchart illustrating an example of an operation in which the control device according to the embodiment of the present invention switches the subunit type of the controlled device so as to correspond to the subunit command implemented by itself.

  When the controlled device 121 and the control device 101 are connected for the first time through the IEEE 1394 serial bus 151, the controlled device 121 generates a bus reset on the IEEE 1394 serial bus 151. The control device 101 monitors the bus reset. After detecting the bus reset (“Yes” in step S2001), the control device 101 discovers the presence of the controlled device 121 having a new GUID (“Yes” in step S2002).

  The control device 101 that has discovered the presence of the controlled device 121 with the new GUID makes an inquiry about the subunit type to the new controlled device 121. At this time, when the subunit type of the controlled device 121 is DISC (“Yes” in step S2003), the controlled device number of the controlled device 121 is set to m, and 0x00808800 00000001 is registered in GUID (m). DISC is registered in the subunit type (m) (step S2004). The control device 101 has already registered (m−1) controlled devices so far, and GUID (m) represents the GUID of the controlled device whose controlled device number is m. The unit type (m) represents the subunit type of the controlled device whose controlled device number is m.

  In step S2004, although the subunit type (m) of the controlled device 121 is registered as DISC, the controlling device 101 cannot control the DISC subunit type, and thus cannot control the controlled device 121. Therefore, the control device 101 issues a command (subunit type change command) for requesting the controlled device 121 to change the subunit type to the VCR (step S2005). In response to this request, the controlled device 121 makes a response of acceptance or rejection.

  The controlled device 121 issues a bus reset when the request from the control device 101 is accepted (processing in step S4011 shown in FIG. 4 described later). Further, as described later, when the controlled device 121 accepts the subunit type change request, the controlled device 121 also changes the GUID along with the subunit type change, but the response message indicating the request acceptance displays a GUID ( In this case, it is desirable to add 0x00808800 00000002) representing the VCR subunit 132.

  When the control device 101 receives a request rejection response from the controlled device 121 (“No” in step S2006), the controlled device 121 has a DISC subunit type that the control device 101 cannot control. The control device 101 cannot control the controlled device 121 (step S2012). On the other hand, if the control device 101 receives a response of request acceptance from the controlled device 121 (“Yes” in step S2006), the control device 101 continues to wait until a bus reset generated from the controlled device 121 is detected. (Step S2007).

  The control device 101 that has detected the bus reset in step S2007 returns to the process of step S2002 again, searches for whether there is a controlled device with a new GUID on the IEEE 1394 serial bus 151, and the controlled device 101 with the GUID of 0x00808800 00000002. The control device 121 is found (“Yes” in step S2002). Then, the control device 101 makes an inquiry about the subunit type to the controlled device 121 having a new GUID. Here, since the subunit type of the controlled device 121 has been changed to VCR (“No” in step S2003), the controlled device 101 sets the controlled device number of the controlled device 121 to m + 1 (the controlled device number just before). As a value different from m), 0x00808800 00000002 is registered in GUID (m + 1), and a VCR is registered in subunit type (m) (step S2008). Then, the control device 101 recognizes the controlled device 121 whose controlled device number is m + 1 as the VCR subunit 132 and performs control with the VCR subunit command (step S2009).

  In step S2006, when the control device 101 receives from the controlled device 121 a response message indicating acceptance of the request with the changed GUID, the controlled device 101 performs control using the VCR subunit command in step S2009. It is possible to reliably grasp that the device 121 (GUID = 0x00808800 00000002) corresponds to the controlled device 121 (GUID = 0x00808800 00000001) that has requested the change to the VCR subunit type in step S2005. .

  Thereby, for example, at the timing when the control device 101 detects the presence of a controlled device with a new GUID after detecting the bus reset in step S2007, a completely different new controlled device is connected to the IEEE 1394 serial bus and a new GUID is detected. Even when a plurality of controlled devices are detected, the control device 101 can determine the controlled device 121 that has made a subunit type change request.

  As described above, the control device 101 controls the controlled device 121 with the VCR subunit command (step S2011), or cannot control the controlled device 121 (step S2012). In any of these states, if the control device 101 detects a bus reset generated on the IEEE 1394 serial bus for any reason (“Yes” in step S2010 or “Yes” in step S2013), the control device 101 again performs step S2002. Returning to FIG. 4, it is searched whether or not a controlled device with a new GUID exists on the IEEE 1394 serial bus 151.

  In this case, the controlled device 121 is a controlled device having a GUID known to the controlling device 101 (“No” in step S2002), and the GUID of the controlled device 121 is 0x00808800 00000002 (“No” in step S2011). ), The control returns to the control by the VCR subunit command in step S2009. If the GUID of the controlled device 121 is 0x008088800 00000001 (“Yes” in step S2011), the controlled device 121 cannot be controlled. A state is entered (step S2012).

  In the above-described operation, the control device 101 makes an inquiry about the type of the subunit type only when the controlled device 121 with a new GUID exists, while the controlled device 101 checks the subunit type with respect to the controlled device 121 with a known GUID. The sub-unit type is determined based on the correspondence between the GUID cached in the control device 101 and the sub-unit type. However, for example, the control device 101 may be configured to make an inquiry about the type of subunit type every time regardless of whether the GUID of the controlled device 121 is known or unknown. In this case, it is not necessary to set a different GUID for each subunit type, and only one GUID needs to be set in the controlled device 121 as in the conventional case.

  Next, an example of the operation of the control device 111 illustrated in FIG. 1 (a control device that implements both the DISC subunit command 112 and the VCR subunit command 113) will be described. FIG. 3 is a flowchart illustrating an example of an operation in which the control device according to the embodiment of the present invention normally controls the controlled device even when the subunit type of the controlled device is changed.

  When the controlled device 121 and the control device 101 are connected for the first time through the IEEE 1394 serial bus 151, the controlled device 121 generates a bus reset on the IEEE 1394 serial bus 151. At this time, similarly to the control device 101, the control device 111 detects the bus reset (“Yes” in step S3001), and then discovers the presence of the controlled device 121 with the new GUID (“Yes” in step S3002). Then, the new controlled device 121 is inquired about the subunit type.

  At this time, when the subunit type of the controlled device 121 is DISC (“Yes” in step S3003), the control device 111 sets the controlled device number of the controlled device 121 to n and sets GUID (n) to 0x00808800 00000001. And the DISC is registered in the subunit type (n) (step S3004). Here, it is assumed that the control device 111 has already registered (n−1) controlled devices so far. Then, the control device 111 recognizes the controlled device 121 whose controlled device number is n as the DISC subunit 131 and performs control with the DISC subunit command (step S3005).

  On the other hand, when the subunit type of the controlled device 121 is VCR (“NO” in step S3003), the controlled device 111 sets the controlled device number of the controlled device 121 to n + 1 and sets 0x00808800 00000002 in GUID (n + 1). At the same time, the VCR is registered in the subunit type (n + 1) (step S3007). Then, the control device 111 recognizes the controlled device 121 whose controlled device number is n + 1 as the VCR subunit 132 and performs control using the VCR subunit command (step S3008).

  As described above, the control device 111 enters a state in which the controlled device 121 is controlled by the DISC subunit command (step S3005) or a state in which it is controlled by the VCR subunit command (step S3008). In this state, if the control device 101 detects a bus reset generated on the IEEE 1394 serial bus for some reason (“Yes” in Step S3006 or “Yes” in Step S3009), the control device 101 returns to Step S3002 again. A search is made as to whether or not a controlled device with a new GUID exists on the IEEE 1394 serial bus 151.

  For example, when the bus reset detected at this time is accompanied by a change in the subunit type on the controlled device 121 side (for example, the subunit operated by the controlled device 121 is changed from the VCR subunit 132). When changing to the DISC subunit 131 for the first time), the GUID of the controlled device 121 is also changed. In this case, the control device 111 finds the controlled device 121 having a new GUID, and performs the above-described processing after step S3003 again. Thereby, according to the change of the subunit in the controlled device 121, the subunit command to be used can be changed and the controlled device 121 can be controlled continuously.

  On the other hand, in the case where the bus reset detected at this time is a bus reset generated by connecting / disconnecting a device to / from the IEEE 1394 serial bus 151, the controlled device 121 is controlled by a GUID known to the controlling device 101. If the GUID of the controlled device 121 is 0x00808800 00000001 (“Yes” in step S3010), the control returns to the control by the DISC subunit command in step S3005, and the controlled device 121 When the GUID is 0x00808800 00000002 (“Yes” in step S3011), the process returns to the control by the VCR subunit command in step S3008. If the GUID of the controlled device 121 is not GUID (n) = 0x00808800 00000001 and GUID (n + 1) = 0x00808800 00000002 (“No” in step S3011), the controlled device having GUID (n) or GUID (n + 1) is used. The device 121 is not detected, and therefore, the control device 101 cannot control the controlled device 121 (step S3012). Note that the control device 101 can control (n−1) controlled devices that have already been registered, regardless of whether the controlled device 121 can be controlled. In this state, if the control device 101 detects a bus reset that has occurred on the IEEE 1394 serial bus for some reason (“Yes” in step S3013), the control device 101 returns to step S3002 again, and on the IEEE 1394 serial bus 151. Whether a controlled device with a new GUID exists.

  Similar to the control device 101 described above, for example, the control device 111 may be configured to make an inquiry about the type of subunit type every time regardless of whether the GUID of the controlled device 121 is known or unknown. In this case, it is not necessary to set a different GUID for each subunit type, and only one GUID needs to be set in the controlled device 121 as in the conventional case.

  Next, an example of the operation in the controlled device 121 illustrated in FIG. 1 will be described. First, an example of an operation for changing the subunit type to be operated in response to a subunit type change request received by the controlled device 121 illustrated in FIG. 1 from an external device (for example, the control device 101) will be described. FIG. 4 is a flowchart illustrating an example of an operation in which the controlled device according to the embodiment of the present invention changes the subunit type to be operated in response to the subunit type change command from the control device.

  The controlled device 121 is set with the GUID, the subunit type, and the next subunit type as its controlled device number as an initial state when the power is turned on (step S4001). The initial state to be set is arbitrary, but here, as the initial state, GUID = 0x008088800 00000001, subunit type = DISC, and the next subunit type = DISC are set in the controlled device 121.

  The GUID and the subunit type correspond to each other. When the GUID is 0x00808800 00000001, the subunit type is DISC, and when the GUID is 0x00808800 00000002, the subunit type is VCR. The next subunit type is information used only at the time of switching the subunit type. In the initial state or stable operation state, the same information as the subunit type is set in the next subunit type.

  When the controlled device 121 and the control device 101 are connected for the first time through the IEEE 1394 serial bus 151, the controlled device 121 generates a bus reset on the IEEE 1394 serial bus 151 (step S4002). At this time, the controlled device 121 refers to the information on the next subunit type.

  If the next subunit type is DISC (“Yes” in step S4003), 0x00808800 00000001 is set to the GUID that is its own controlled device number, the subunit type is set to DISC, and the DISC subunit is set. The operation according to 131 is performed (step S4004). On the other hand, if the next subunit type is a VCR (“NO” in step S4003), 0x00808800 00000002 is set in the GUID that is its own controlled device number, the subunit type is set to VCR, and the VCR subunit is set. The operation according to 132 is performed (step S4005).

  As described above, the controlled device 121 is operated by the DISC subunit 131 or the VCR subunit 132. In this state, a subunit type change command is received from the controlling device 101, or a bus reset occurs for some reason. (No in step S4006 and “No” in step S4007). If a bus reset occurs for some reason (“Yes” in step S4007), the process returns to step S4003 and the above-described operation is performed again. However, normally, the subunit type is not changed, and the original operation is performed again. Return to the state (the state in which the operation is performed by the DISC subunit 131 or the VCR subunit 132).

  On the other hand, when a subunit type change command (for example, a command sent by the control device 101 in step S2005 shown in FIG. 2) is received (“Yes” in step S4006), the controlled device 121 changes to the subunit type change command. Reference is made to the subunit type requested to be changed (ie, the subunit type after the change). If the changed subunit type is DISC (“YES” in step S4008), DISC is set in the next subunit type information (step S4009), and if the changed subunit type is VCR (step S4008). "No"), VCR is set in the information of the next subunit type (step S4010).

  Note that the controlled device 121 normally receives a change request to a subunit type different from the current subunit type by a subunit type change command. Therefore, the processing of step S4009 or step S4010 causes the subunit type information and the following The subunit type information is a state in which different subunit types are set.

  After changing the setting of the next subunit type information in the processing of step S4009 or step S4010, the controlled device 121 issues a bus reset (step S4011), returns to step S4003, and performs the above-described operation again. At this time, in step S4004 or step S4005, the GUID and the subunit type different from the current setting are changed, and the operation based on the changed subunit type is started.

  According to the flowchart shown in FIG. 4, when the controlled device 121 receives a subunit type change command (for example, a command for requesting a change from DISC to VCR), it immediately changes the subunit type at that time. First, store the changed subunit type (for example, VCR) as the next subunit type information, issue a bus reset, and simultaneously switch the GUID and subunit type (GUID is set to 0x00808800 00000002, and the subunit type is changed). Change to VCR). As a result, the controlled device 121 can switch the GUID and the subunit type at the timing when the IEEE 1394 serial bus is initialized, and the synchronization of the subunit type switching timing in both the controlled device 101 and the controlled device 121 is synchronized. Can be achieved.

  The timing for changing the information of the next subunit type and the timing for changing to the subunit type to be actually operated in the controlled device 121 will be described with reference to FIG. FIG. 8 is a timing chart showing an example of the switching timing of each information of the next subunit type, subunit type, and GUID of the controlled device in the embodiment of the present invention.

  In FIG. 8, for example, the controlled device 121 operates in a state in which GUID = 0x00808800 00000001, subunit type = DISC, and information on the next subunit type = DISC. At this time, when the controlled device 121 receives a request for switching to the VCR subunit, only the information on the next subunit type is switched from the DISC subunit to the VCR subunit (corresponding to the process of step S4010 shown in FIG. 4). ). Thereafter, the controlled device 121 issues a bus reset to the control device 101 after completing a series of necessary processes including a response process for accepting the subunit type change request, for example ( This corresponds to the processing in step S4011 shown in FIG. Simultaneously with the issuance of this bus reset, the GUID is changed to 0x00808800 00000002 and the subunit type is changed to the VCR (corresponding to the process of step S4005 shown in FIG. 4). As can be seen from FIG. 8, when the subunit type information and the next subunit type information are different from each other, the subunit type information is changed at the same time the bus reset is issued after the subunit type change command is received. Only a relatively short time to make the change.

  Next, the controlled device 121 shown in FIG. 1 performs an operation for changing a subunit type to be operated according to a manual setting by the user or a command type received from an external device (for example, the control device 101). An example will be described. FIG. 5 is a flowchart illustrating an example of an operation in which the controlled device according to the embodiment of the present invention changes the subunit type to be operated in accordance with the manual setting by the user or the type of command received from the control device.

  In FIG. 5, the processes in steps S5001 to S5005 are the same as the processes in steps S4001 to S4005 shown in FIG. Therefore, the controlled device 121 enters a state where the DISC subunit 131 or the VCR subunit 132 operates from the initial state.

  This state continues until the subunit type is manually switched by the user, or a command of a type different from the currently set subunit command is received from an external device (for example, the control device 101 or 111). (“No” in step S5006 and “No” in step S5007).

  For example, when the user manually switches the subunit type in order to operate the controlled device 121 operating as the DISC subunit 131 as the VCR subunit 132 (“Yes” in step S5006). In step S5008 and subsequent steps, the switching of the subunit type is used as a trigger. Note that the processing of steps S5008 to S5011 is the same as the processing of steps S4008 to S4011 shown in FIG. 4, that is, the controlled device 121 issues a bus reset after the information on the next subunit type is changed. At the same time, the subunit type to be actually operated is changed.

  For example, when the control device 111 uses the DISC subunit command 112 and the controlled device 121 is controlled as the DISC subunit 131, the control device 101 sends the VCR subunit command 102. When a command of a type different from the current setting is received (“Yes” in step S5007), the command analysis unit 142 of the controlled device 121 detects this and switches the subunit type (after step S5008). Is started).

  In this way, the controlled device 121 is configured such that the switching of the subunit type is performed by manual switching by the user or automatic switching according to the type of command from the control device 101 or the control device 111. By switching the GUID and subunit type at the timing when the IEEE 1394 serial bus is initialized, it is possible to synchronize the subunit type switching timing with the control device 111.

  The relationship between the flowchart shown in FIG. 5 and the timing chart shown in FIG. 8 is that the switching to the VCR subunit shown in FIG. 8 is performed when the user switches the subunit type switch (“Yes” in step S5006). This corresponds to the case where a command of a type different from the currently set subunit command is received from the control device 101 or the control device 111 (“Yes” in step S5007).

  FIGS. 6 and 7 show the connection form of the IEEE 1394 serial bus and the command type before and after the controlled device 121 switches the subunit type in the embodiment of the present invention. The GUID of the controlled device 121 shown in FIG. 6 is 0x00808800 00000001, and the subunit type is DISC. In this state, the control device 111 can control the controlled device 121 using the DISC subunit command. However, the control device 101 controls the controlled device 121 because the DISC subunit command is not implemented. It is not possible.

  In this state, for example, when the control device 101 requests the controlled device 121 to change from the DISC subunit to the VCR subunit, the bus is reset to the IEEE 1394 serial bus (not shown in FIGS. 6 and 7). The controlled device 121 changes the GUID and changes the subunit type to be operated from DISC to VCR. As a result, the control device 101 can control the controlled device 121 using the VCR subunit command 102. Further, since the controlled device 121 sets a new GUID in itself, the controlling device 111 regards that the new controlled device 121 is connected to the IEEE 1394 serial bus, and the subunit type of the controlled device 121 is VCR. And the controlled device 121 is controlled using the VCR subunit command 113.

  Here, the GUID and the subunit type of the controlled device 121 are changed in response to the change request of the controlled device 101. At this time, the controlled device 121 gives the changed GUID to the controlled device 111. You may send it. Accordingly, the control device 111 can grasp that the controlled device 121 with GUID = 0x00808800 00000001 and the controlled device 121 with GUID = 0x00808800 00000002 are the same controlled device 121, and the controlled device before and after the bus reset. For example, it is possible to reliably specify 121 and to perform control that continues even after a bus reset occurs.

  In the embodiment of the present invention described above, the controlled device 121 issues a bus reset, and the control devices 101 and 111 are described based on a state configured to detect the bus reset. Conversely, the control devices 101 and 111 may issue a bus reset, and the controlled device 121 may detect the bus reset. In this case, the control devices 101 and 111 have a bus reset issuing unit, and the controlled device 121 has a bus reset detection unit. For example, the bus reset detection in the flowcharts shown in FIGS. 4 and 5, the operation according to the present invention can be easily conceived by replacing the bus reset issuance in the flowcharts shown in FIGS. 4 and 5 with the bus reset detection, and it can be seen that the object of the present invention can be achieved.

  In addition, the control devices 101 and 111 may newly provide a command for acquiring all combination information of GUIDs for the corresponding subunits of the controlled device 121. In this case, the control devices 101 and 111 can acquire the combination information immediately after initialization, so that the same controlled device 121 can be identified more reliably.

  The present invention has an effect that the control device can recognize that the switching of the subunit type is performed in the controlled device, and the normal control operation is continuously performed. It can be applied to a data transmission technique based on the IEEE 1394 system.

It is a figure which shows an example of the connection form of the to-be-controlled device and control apparatus in embodiment of this invention. It is a flowchart which shows an example of the operation | movement which switches the subunit type of a to-be-controlled apparatus so that the control apparatus in embodiment of this invention respond | corresponds to the subunit command which self implements. 6 is a flowchart illustrating an example of an operation in which the control device in the embodiment of the present invention normally controls the controlled device even when the subunit type of the controlled device is changed. It is a flowchart which shows an example of the operation | movement which changes the subunit type to operate | move according to the subunit type change command from a control apparatus in the embodiment of this invention. It is a flowchart which shows an example of the operation | movement which changes the subunit type to operate | move according to the type of the command which the controlled apparatus in embodiment of this invention receives from the manual setting by a user, or a control apparatus. It is a figure which shows an example of the connection form and command type of the IEEE1394 serial bus before the controlled apparatus in embodiment of this invention switches a subunit type. It is a figure which shows an example of the connection form and command type of the IEEE1394 serial bus after the controlled apparatus in embodiment of this invention has switched subunit type. It is a timing chart which shows an example of the switching timing of each information of the following subunit type of the controlled apparatus in embodiment of this invention, subunit type, and GUID.

Explanation of symbols

101 Control equipment (DTV)
102, 113 VCR subunit command 103, 114 Bus reset detection unit 104, 115, 133 IEEE 1394 communication unit (communication unit)
105, 116, 134, 135 IEEE1394 terminal (connector)
111 Control equipment (PC)
112 DISC subunit command 121 Controlled device (HDD)
131 DISC subunit 132 VCR subunit 141 Operation subunit switching unit 142 Command analysis unit 143 Bus reset issuing unit 151, 152 IEEE 1394 serial bus

Claims (6)

A controlled device equipped with a subunit conforming to the IEEE 1394 system controlled by a control device compliant with the IEEE 1394 system via an IEEE 1394 serial bus;
A plurality of function realizing means for each subunit type for realizing the functions of a plurality of subunit types assigned to the subunit by a subunit control command defined for each subunit type issued by the control device;
A function selecting means for selecting one function realizing means instructed as an object to be controlled by the control device from the plurality of function realizing means;
When it is detected that a bus reset signal is supplied via the IEEE 1394 serial bus, the function selection unit is controlled to select the function realization unit according to an instruction from the control device. A bus reset detecting means for
Controlled device. A controlled device equipped with a sub-unit conforming to the IEEE 1394 system controlled by a control device conforming to the IEEE 1394 system via an IEEE 1394 serial bus;
A plurality of function realizing means for each subunit type for realizing a function of a plurality of subunit types assigned to the subunit by a subunit control command defined for each subunit type issued by the control device;
A function selecting means for selecting one function realizing means instructed as an object to be controlled by the control device from the plurality of function realizing means;
A bus reset issuing means for issuing a bus reset signal via the IEEE 1394 serial bus when the function realizing means is selected by the function selecting means according to an instruction from the control device;
Controlled device. A controlled device equipped with a sub-unit conforming to the IEEE 1394 system controlled by a control device conforming to the IEEE 1394 system via an IEEE 1394 serial bus;
A plurality of function realizing means for each subunit type for realizing a function of a plurality of subunit types assigned to the subunit by a subunit control command defined for each subunit type issued by the control device;
One function realization means instructed as an object to be controlled by the control device is selected from the plurality of function realization means, and an eigenvalue corresponding to the selected function realization means is selected for the control device. Function selection means for setting the identification information of the controlled device shown
Controlled device.   When it is detected that a bus reset signal is supplied via the IEEE 1394 serial bus, the function selection unit is controlled to select the function realization unit according to an instruction from the control device. The controlled device according to claim 3, further comprising: a bus reset detection unit that performs the operation.   The bus reset issuing means for issuing a bus reset signal via the IEEE 1394 serial bus when the function selecting means is selected by the function selecting means in accordance with an instruction from the control device. The controlled device as described. A control device conforming to the IEEE 1394 method for controlling a controlled device equipped with a subunit conforming to the IEEE 1394 method via an IEEE 1394 serial bus,
Command issuing means for instructing one function among a plurality of subunit type functions assigned to the subunit as a target to be controlled by issuing a subunit control command defined for each subunit type;
A bus reset issuing means for issuing a bus reset signal via the IEEE 1394 serial bus when a change to the function instructed by issuing the subunit control command is accepted by the controlled device;
Control device having.

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