JP3862371B2 - Electronic device and control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention, Electronic devices having a plurality of functional units and communication means such as a digital interfaceConcerningThe
[0002]
[Prior art]
In recent years, with the development of multimedia technology, various types of information data can be transmitted in various forms on various communication protocols via one digital I / F (interface) bus system. It has become to.
[0003]
In addition, an apparatus corresponding to one communication protocol has a plurality of functional units therein, and it is also possible to perform external control or exchange of information with the outside for each unit. An example of this type of digital I / F bus system is an IEEE 1394 serial bus.
[0004]
[Problems to be solved by the invention]
  The IEEE 1394 serial bus generally has a different communication protocol depending on each function in addition to a protocol common to IEEE 1394 in order to cope with the existence of nodes having various functions. Where the bookSpecificationFor example, a protocol unique to each serial bus such as the IEEE 1394 serial bus is referred to as a basic protocol regardless of a function, and a protocol different depending on each function is referred to as a sub-communication protocol.
[0005]
That is, even in the communication of digital information corresponding to the basic protocol of the basic bus system of the digital I / F bus, the sub communication protocol defined in each node terminal (I / F terminal) corresponds to that of the communication partner, Further, it is general that a means for converting the sent data form into a usable form is required on the other side.
[0006]
Since the sub-communication protocol is generally standardized individually depending on the genre (category) of the device or the built-in unit, each node should be a device corresponding to a single sub-communication protocol. It was general.
[0007]
Also, if the device has multiple functions but they cannot operate at the same time, or if the unit configuration or device (node) operation or sub-communication protocol changes depending on attachments, etc., digital I The device definition (node information definition) when viewed from the / F bus was difficult.
[0008]
Furthermore, even if a device has only a single function, if the device is an image input device, the method of use of the input image at the communication destination may be different, so display, recording, printing, etc. It is desirable to use a different sub-communication protocol for each method. Furthermore, even if functions and usage methods are common, it is necessary to consider the situation where different sub-communication protocols are prepared for each manufacturer.
[0009]
  Therefore,The present inventionProvided is an electronic device that can easily use a plurality of functional units and a communication protocol corresponding to each of the plurality of functional units.For the purpose.
[0011]
[Means for Solving the Problems]
  BookinventionPower ofChild equipmentAn electronic device having a first functional unit and a second functional unit, wherein the electronic device is operated as an electronic device having the first functional unit, and a communication protocol for the first functional unit And a second operation mode for operating the electronic device as an electronic device having the second functional unit and using a communication protocol for the second functional unit. And the selection means for selecting the first operation mode or the second operation mode. When the first operation mode is selected, the electronic device is connected to the first function. Operating as an electronic device having a unit, and causing the communication means for performing communication between the electronic device and another electronic device to perform a bus reset so that the second operation is performed. If the mode is selected, along with operating the electronic device as an electronic device having the second functional unit, characterized in that to perform a bus reset on the communication means.
[0012]
  In addition, the present inventionControl methodIsA first functional unit and a second functional unit are provided so that the electronic device can be operated as an electronic device having the first functional unit and a communication protocol for the first functional unit can be used. And a second operation mode in which the electronic device is operated as an electronic device having the second functional unit and a communication protocol for the second functional unit can be used. A control method for controlling an electronic apparatus having a selection means for selecting the first operation mode or the second operation mode, wherein when the first operation mode is selected, the electronic apparatus is The electronic device having the first functional unit is operated and a bus reset is performed on a communication means for performing communication between the electronic device and another electronic device. And a step of operating the electronic device as an electronic device having the second functional unit and causing the communication means to perform a bus reset when the second operation mode is selected. Characterized by.
[0013]
  The other of the present inventionControl deviceIsAn electronic device having a first functional unit and a second functional unit, wherein the electronic device is operated as an electronic device having the first functional unit, and communication for the first functional unit is performed. A first operation mode in which a protocol can be used, a first operation mode in which the electronic device is operated as an electronic device having the second functional unit, and a communication protocol for the second functional unit can be used. 2 and a selection means for selecting the first operation mode or the second operation mode, and when the first operation mode is selected, the electronic device is connected to the second operation mode. The electronic device having the functional unit is not operated and the communication protocol for the second functional unit cannot be used, so that the second operational mode is not used. When the mode is selected, the electronic device is not operated as an electronic device having the first functional unit, and the communication protocol for the first functional unit is not usable. Do.
[0014]
  Furthermore, the present inventionOther control methodsIsA first functional unit and a second functional unit are provided so that the electronic device can be operated as an electronic device having the first functional unit and a communication protocol for the first functional unit can be used. And a second operation mode in which the electronic device is operated as an electronic device having the second functional unit and a communication protocol for the second functional unit can be used. A control method for controlling an electronic apparatus having a selection means for selecting the first operation mode or the second operation mode, wherein when the first operation mode is selected, the electronic apparatus is Do not operate as an electronic device having the second functional unit, and make it impossible to use the communication protocol for the second functional unit When the second operation mode is selected, the electronic device is not operated as an electronic device having the first functional unit, and the communication protocol for the first functional unit is used. And a process for preventing.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings only using the embodiments.
[0016]
First, a system which is a premise of the embodiment described below, that is, a system in which a plurality of electronic devices are connected by an IEEE 1394-1995 serial bus (hereinafter referred to as a 1394 serial bus) and communication is performed between these electronic devices will be described. To do.
[0017]
Generally, various digital devices such as a digital video tape recorder (hereinafter referred to as VTR) and a digital television receiver (hereinafter referred to as TV) are connected by a digital bus, and digital data and control data are transferred between these electronic devices. A communication system using a 1394 serial bus is considered as a communication system that performs multiplexing and transmission.
[0018]
The 1394 serial bus will be briefly described below.
[0019]
FIG. 1 shows an example of a network system configured using a 1394 serial bus. This system includes devices A, B, C, D, E, F, G, and H. Between A and B, between A and C, between B and D, between D and E, between C and F, and C -G and C-H are connected by a 1394 serial bus twist bear cable. Examples of the devices A to H are a PC, a digital VTR, a DVD, a digital camera, a hard disk, a printer, and a monitor.
[0020]
As the connection method between the devices, the daisy chain method and the node branch method can be mixed, and a connection with a high degree of freedom is possible.
[0021]
Each device has its own unique ID, and each device recognizes each other to form one network within a range connected by the 1394 serial bus. By simply connecting each digital device with one 1394 serial bus cable in sequence, each device serves as a relay and constitutes a single network as a whole. In addition, it has a function of automatically recognizing a device and recognizing a connection state when the cable is connected to the device by the Plug & Play function, which is a feature of the 1394 serial bus.
[0022]
In addition, in the system as shown in FIG. 1, when a device is deleted from the network or newly added, the bus is automatically reset, the network configuration up to that point is reset, and a new one is added. A reliable network. This function makes it possible to always set and recognize the network configuration at that time.
[0023]
The data transfer rate is 100/200/400 Mbps, and devices with higher transfer rates support lower transfer rates and are compatible.
[0024]
Data transfer modes include asynchronous transfer mode for transferring asynchronous data such as control signals (asynchronous data: hereinafter referred to as “Async data”), and isochronous for transferring synchronous data (isochronous data: hereinafter referred to as “Iso data”) such as video data and audio data such as real time. There is a transfer mode. The Async data and Iso data are mixed in the cycle while giving priority to the transfer of Iso data following the transfer of the cycle start packet (CSP) indicating the start of the cycle in each cycle (usually 1 cycle 125 μs). Transferred.
[0025]
FIG. 2 is a schematic diagram functionally showing the configuration of the 1394 serial bus.
[0026]
As shown in the figure, the 1394 serial bus has a layer structure as a whole. As shown in FIG. 2, the most physical component is a 1394 serial bus cable, and there is a connector port to which the connector of the cable is connected. On top of this, there are a physical layer and a link layer as hardware. There is.
[0027]
The hardware part is a substantial interface chip part, of which the physical layer performs encoding, connector-related control, and the like, and the link layer performs packet transfer, cycle time control, and the like.
[0028]
The transaction layer of the firmware unit manages data to be transferred (transaction), and issues instructions such as data reading and writing. The serial bus management is a part that manages the connection status and ID of each connected device, and manages node control and network configuration.
[0029]
The functions of the bus manager and isochronous resource manager described later are included in this serial bus management. The hardware and firmware are the basic components of the 1394 serial bus. That is, the basic protocol of the 1394 serial bus described above is constructed by the firmware up to the transaction and layer.
[0030]
On the other hand, the application layer of the software section is composed of software defined by the above-described sub-communication protocol, and differs depending on each software. That is, this application layer defines what data is put on the 1394 serial bus for communication.
[0031]
Next, the addressing of the 1394 serial bus will be described with reference to FIG. As shown in FIG. 3, the 1394 serial bus regulates an address space having a width of 64 bits in accordance with the IEEE 1212 rule. The first 10 bits of the 64-bit address are called a bus ID and are used to identify the bus. The next 6 bits are called a node ID and used to identify each device. The remaining 48 bits are an address space that can be used uniquely for each device.
[0032]
The 48-bit address space is further divided into 20 bits and 28 bits, and the first 20 bits are “FFFFF”.₁₆A portion indicated by “” is a register space, and is used for information exchange between devices.
[0033]
The first 512 bytes of the register space is the core of the well-known CSR architecture, and there is a serial bus register as the next 512 bytes. The specific contents of these parts are well known and will not be described in detail. However, these and the subsequent 1024-byte configuration ROM and part of the unit space are mounted on each device.
[0034]
Here, the configuration ROM is configured, for example, as shown in FIG. 4 in order to represent the function of each node. In the figure, an offset address is a relative position from “FFFFF0000000”, and the configuration ROM is arranged from “FFFFF0000400”.
[0035]
Here, in the bus information block (indicated by Bus_info_block in the figure), data such as a company ID indicating the device supplier, in the root directory (in the figure, Root_directory), the unique information of each node and the next unit directory (in the figure) The storage location of (Unit Directory) is shown. In the unit directory, data indicating the function of each device, data indicating a compatible sub-communication protocol, and the like are arranged hierarchically.
[0036]
Hereinafter, an example of a communication system to which the present invention is applied will be described.
[0037]
FIG. 5 shows an example of a communication system to which the present invention is applied.
[0038]
The system shown in FIG. 5 includes a PC (personal computer), a TV, a VTR, and a camera and recorder (hereinafter referred to as CAM) having video and still image shooting functions as digital devices. The PC and the VTR are connected by the 1394 serial bus. Each of the above digital devices has a function of relaying digital data and control data on the 1394 serial bus.
[0039]
Also, the cable for 1394 has three pairs of shielded pairs. Each pair of wires is used not only for protocol signal transfer and data transfer, but also for power supply, so that the entire system can operate even if there are devices that are powered off in the system. Configured to get.
[0040]
Among the devices described above, for example, the basic configuration of a VTR includes a deck unit, a tuner unit, an operation unit that is a user interface, a display unit, a microcomputer that performs overall operation control, packet creation during communication, address holding, and the like. A digital interface (digital I / F) for the 1394 serial bus and a switch unit for switching the deck unit, tuner unit, and digital I / F are provided. In addition, the basic configuration of the TV is provided with a monitor unit and an amplifier unit instead of the display unit and deck unit of the basic configuration of the VTR as described above. In the case of a CAM, a camera unit is provided instead of the tuner unit. It has been. The PC has a CPU, an operation unit, a display unit, and an image processing unit, and has a switch unit and a digital I / F like other devices.
[0041]
Further, in the above-described 1394, communication is performed in a predetermined communication cycle (125 μs) as shown in FIG. Data with a time axis such as video data and audio data is communicated by isochronous (synchronous) communication with a guaranteed transfer bandwidth at a constant data rate, and control data such as control commands are transmitted as needed. Asynchronous (asynchronous) communication is performed irregularly.
[0042]
In such communication, there is a cycle start packet at the beginning of each communication cycle, followed by a period for transmitting a packet for isochronous communication.
[0043]
Further, by attaching a channel number to a packet for isochronous communication, isochronous communication of a plurality of channels can be performed simultaneously. For example, when channel 1 is assigned to communication from the CAM to the VTR, the CAM 1 sends an isochronous communication packet of channel number 1 on the bus immediately after the cycle start packet. On the other hand, the VTR monitors packets on the bus and takes in packets with channel numbers, thereby executing isochronous communication between the CAM and the VTR.
[0044]
Similarly, when channel number 2 is assigned to a packet from the TV to the PC, the channel number 2 packet is transmitted on the bus after the channel number 1 packet, so that isochronous communication is established between the TV and the PC. And isochronous communication between channel 1 and channel 2 is performed in parallel.
[0045]
Then, after transmission of all isochronous communication packets is completed in each communication cycle, a period until the next cycle packet is used for asynchronous communication.
[0046]
Next, bus management for enabling the bus system to operate will be described.
[0047]
The device serving as the bus manager first grasps the network structure and the connection state of all nodes, and controls the bus communication by defining each node ID and controlling the isochronous communication.
[0048]
In the communication system as described above, when power is turned on, or when a new digital device is connected or disconnected, a node ID (in FIG. 5) is assigned to each device (node) according to the connection form. The physical addresses of # 0, # 1, # 2, and # 3) are assigned by the following procedure based on the address program and address table stored in the memory in the microcomputer, and the topology is automatically set.
[0049]
The node ID assignment procedure will be briefly described below. This procedure consists of determining the hierarchical structure of the system and assigning a physical address to each node.
[0050]
Here, regarding each of the digital devices, TV is node A, CAM is node B, PC is node C, and VTR is node D.
[0051]
First, each node communicates with each other that the other party is its parent to the other node to which it is connected via the P1394 serial bus. At this time, the one that has been transmitted to the partner first is given priority, and finally the parent-child relationship between each node in this system, that is, the hierarchical structure of the system and the root node that is a node that does not become a child with respect to other nodes is determined. Is done.
[0052]
Specifically, in FIG. 5, node D transmits to node C that the other party is a parent, and node B transmits to node A that the other party is a parent. In addition, when node A transmits to node C that the other party is a parent, and node C transmits to node A that the other party is a parent, If priority is given and transmission by node C is earlier, node A is set as the parent of node C. As a result, the node A does not become a child to any other node, and in this case, becomes a root node.
[0053]
Thus, after the parent-child relationship of each digital device is determined, a physical address is assigned. This physical address is basically assigned by allowing the parent node to give an address to the child node, and further allowing each child node to assign an address in order from the child node connected to the younger port number. Done.
[0054]
In the example of FIG. 5, when the parent-child relationship is determined as described above, the node A first grants an address to the node B, and as a result, the node B gives the physical address # 0 to itself. Then, by sending this information on the bus, it is notified to other nodes that “physical address # 0 has been assigned”.
[0055]
Next, when the node A permits the node C to give an address, the node D, which is a child of the node C, is also granted an address. As a result, node D assigns itself the physical address # 1 next to # 0 as a physical address, and sends this to the bus.
[0056]
After that, node C gives itself a physical address # 2 and sends this on the bus, and finally node A gives itself a physical address # 3 and sends it on the bus.
[0057]
Next, a data transfer procedure will be described.
[0058]
Data transfer is possible by giving the physical address as described above, but in the P1394 serial bus, the bus use right is arbitrated by the root node prior to data transfer.
[0059]
Each node requests a bus use right from its parent node when it wants to transfer data, and as a result, the root node arbitrates a request for the bus use right from each node. As a result, the node that has obtained the bus use right designates the transmission speed before starting the data transfer, and notifies the transmission destination node of 100 Mbps, 200 Mbps, or 400 Mbps.
[0060]
After that, in the case of isochronous communication, the transmission source node receives the cycle start packet sent in synchronization with the communication cycle by the root node as the cycle master, and immediately transfers data on the designated channel. Start. The cycle master sends the cycle start packet onto the bus and adjusts the time of each node.
[0061]
On the other hand, in the case of asynchronous communication that transfers control data such as commands, arbitration for asynchronous communication is performed after the synchronous transfer in each communication cycle is completed, and data transfer from the transmission source node to the transmission destination node is performed. Be started.
[0062]
FIG. 7 is a system block diagram showing a detailed configuration of the camera & recorder (CAM) in FIG. 5 which is an embodiment of the electronic apparatus of the present invention.
[0063]
In FIG. 7, reference numeral 1 denotes an image pickup unit including a lens, a CCD, an image pickup basic circuit, and the like, which perform image pickup and camera unit signal processing such as brightness and color adjustment of the picked up image. The image information processed by the imaging unit 1 is output to the video processing unit 2 or the digital camera processing unit 3 in a form suitable for each.
[0064]
A video processing unit 2 digitizes video information from the imaging unit 1 and performs encoding processing based on a predetermined algorithm such as a DVC format compression method or MPEG method as video data compression processing. It also performs processing such as conversion to a format suitable for transmission.
[0065]
Reference numeral 3 denotes a digital camera processing unit, which digitizes image information from the imaging unit 1, performs image processing for adjusting the screen size, sampling, and the like, and performs encoding processing based on the JPEG method as image data compression processing Apply. It also performs processing such as conversion to a format suitable for transmission.
[0066]
Reference numeral 4 denotes a switch circuit, which switches between the moving image signal sig1 from the video processing unit 2 and the still image signal sig2 from the camera processing unit 3, and sends any one of the image signals to the 1394 serial bus I / O via the switch 22. It can be output to the F circuit 5. The 1394 serial bus I / F circuit 5 includes a reset circuit 19 for the 1394 serial bus 13.
[0067]
In addition, the video from the video processing 2 and the image from the digital camera processing unit 3 can be recorded or reproduced by the recording / reproducing means 20 in addition to transmission through the 1394 bus. The data reproduced here may be transmitted from the 1394 bus. The recording / reproducing means 20 includes a recording medium and a device used for recording and reproducing operations.
[0068]
Reference numeral 6 denotes a system control circuit (controller), which includes a microcomputer and a memory. In the configuration of the controller 6, reference numeral 7 denotes an I / F control and address conversion circuit. The controller 6 receives node information, commands and status information in data communicated by the 1394 I / F circuit 5 via the 1394 bus 13. And 1394 I / F circuit 5 for exchanging information.
[0069]
Reference numeral 8 denotes a first configuration ROM (CR1) as the above-described configuration ROM, and a moving image obtained by a digital moving image camera & recorder (first unit) functioning in combination with the imaging unit 1 and the video processing unit 2. The node information of the 1st protocol which communicates the command / status information regarding image signal sig1 with 1394 bus 13 is stored. This node information is written in advance in the first configuration ROM 8 at the time of production as desirable node information when the apparatus is in this state.
[0070]
Reference numeral 9 denotes a second configuration ROM (CR2), which is a still image signal sig2 obtained by a digital camera (second unit) that functions in combination with the imaging unit 1 and camera processing unit 3, and a command / status relating thereto. The node information of the second protocol for communicating information with the 1394 bus 13 is stored. This node information is written in advance in the second configuration ROM 9 as desired node information when the apparatus is in this state at the time of production.
[0071]
Reference numeral 10 denotes a command & status register (C & S register) which is used in both cases of the first unit and the second unit, and is a register for storing unit control information. Reference numeral 11 denotes a control unit that controls the operations of the first unit and the second unit in accordance with commands in the C & S register 10 and controls the sub-communication protocol.
[0072]
The 1394 serial bus I / F circuit 5 and the controller 6 described above constitute the interface control device of this embodiment.
[0073]
Reference numeral 12 denotes a video / camera switch means. The operation of the electronic apparatus according to the present embodiment viewed from the 1394 bus 13 is a digital moving image camera & recorder (first unit) or a digital still image camera & recorder (second Unit).
[0074]
14 is a control signal and command / status related signal of the 1394 I / F circuit 5, 15 is a control signal of the switch circuit 4, 16 is a control signal of the video processing unit 2, 17 is a control signal of the camera processing unit 3, and 18 is an imaging unit. 1 is a control signal, and 21 is a control signal of the recording / reproducing unit 20.
[0075]
FIG. 8 is a diagram showing the node information of the present device as viewed from the 1394 bus 13, and shows the memory arrangement of the configuration ROM, the unit control command register, and the status register. As shown in the figure, this embodiment has first and second configuration ROMs 8 and 9 (CR 1 and CR 2).
[0076]
That is, in the case of the present embodiment, which of the first and second configuration ROMs 8 and 9 depends on the state of the electronic device (whether it is used as a digital video camera & recorder or a digital still camera & recorder). One of them can be defined as a configuration ROM from the bus. Note that, regardless of which configuration ROM 8 or 9 is used, the command register and status register use the common area RAM (C & S register 10).
[0077]
FIG. 9 shows an arrangement of data transferred by each sub-communication protocol between the digital video recorder (first unit) and the digital camera (second unit) in a box of data packets transferred by the 1394 basic communication protocol. Is. Both packets have a packet header corresponding to the basic communication protocol of the IEEE 1394 serial bus, and data according to each sub communication protocol is added to the Payload area.
[0078]
Hereinafter, an operation for changing one electronic apparatus from a digital moving image camera & recorder to a digital still image camera & recorder according to the present embodiment will be described with reference to FIGS.
[0079]
The electronic device of the present embodiment having the configuration shown in FIG. 7 initially operates as a digital video camera and recorder, and is a node related to the first sub-communication protocol stored in the first configuration ROM (CR1) 8 It is assumed that information is placed on the 1394 bus 13 via the 1394 serial bus I / F circuit 5 and communicated with other nodes.
[0080]
At this time, the compressed video signal sig1 obtained by the video processing unit 2 is data compliant with the SD format of the DVC format, that is, data subjected to variable length encoding after discrete cosine conversion, and is attached with subcode data and AUX data. This is a signal in a format corresponding to the video track. Such a moving image signal sig1 is transmitted from the 1394 I / F circuit 5 through the switch circuit 4 in the isochronous communication mode.
[0081]
At the same time, in the Acicumchronous communication mode, the control command and status information of the digital video moving image camera & recorder are communicated. The received command is stored in the C & S register 10. The control unit 11 controls the video processing unit 2 with a control signal 16 based on the stored reception command.
[0082]
In this state, the digital still image camera & recorder unit (second unit) is not visible from the 1394 serial bus 13. In this case, the 1394 serial bus I / F circuit 5 can be used as a dubbing terminal by communicating with other digital video devices, for example. The sub-communication protocol used at this time is the IEEE 1394 AV / C protocol.
[0083]
  On the other hand, when the user uses the electronic apparatus of the present embodiment as a digital still image camera & recorder device, for example, when used as a digital image capturing means to a personal computer (not shown), the protocol for communicating with the personal computer is as described above. AV / CprotocolDifferent still image sub-communication protocols are used.
[0084]
Here, an outline of the AV / C protocol and the digital camera protocol will be described.
[0085]
FIG. 10A shows an isochronous packet configuration in the AV / C protocol, and FIG. 10B shows an isochronous packet configuration in the digital still image protocol.
[0086]
The AV / C protocol is a well-known sub-communication protocol, and defines a real-time data transfer protocol using 1394 isochronous data transfer and an autonomous data flow control. For real-time transfer, the common isochronous packet (CIP) is defined in the AV / C protocol, and the CIP and real-time (AV) data are stored in the data portion of the isochronous packet as shown in FIG. ing.
[0087]
The length of the source packet of the AV / C protocol is fixed for each device, and the source packet is divided into 1, 2, 4 or 8 data blocks and sent as a plurality of isochronous packets. When returning the fragmented packet, the time stamp field in the CIP is used to restore the real time data.
[0088]
When the apparatus is activated, a packet header and an empty packet with only a CIP header are sent even when there is no data to be sent.
[0089]
In the AV / C protocol, an FCP (Function Control Protocol) is prepared to control devices on the IEEE 1394 bus. The transmission and response of the control command can be controlled by sending an FCP packet frame using an asynchronous packet.
[0090]
As shown in FIG. 10B, the still image protocol has a normal configuration in which the isochronous packet configuration does not include CPI or the like as in the AV / C protocol in the data portion. Data is stored in this data area in the configuration of color signals distinguished by the following modes.
[0091]
The mode is
Mode 0: YUV (4: 4: 4) format
Mode 1, Mode 3: YUV (4: 2: 2) format
Mode 2: YUV (4: 1: 1) format
Mode 4: RGB format
Mode 5: Y (Mono) format
In this structure, Y, U, V, R, G, and B each contain 8-bit pixel data.
[0092]
Further, in the still image protocol, there is no FCP as in the AV / C protocol, and only writing is performed from the transaction layer.
[0093]
Hereinafter, an operation after the video / camera switch means 12 is operated to switch the electronic apparatus of the present embodiment from the digital moving image camera & recorder to the digital still image camera & recorder will be described.
[0094]
After detecting the switching of the video / camera switch means 12, the controller 6 temporarily stops the bus control of the 1394 I / F circuit 5 in order to reset the 1394 serial bus 13 and rebuild the bus management structure. .
[0095]
Then, unit control in the system configuration of the digital camera (second unit) is performed, and the C & S register 10 is set for the digital camera. Next, in order to change the node information of the 1394 I / F circuit 5 from the first configuration ROM 8 to the second configuration ROM 9, the address setting of the I / F control and address conversion circuit 7 is changed. That is, the configuration ROMs 8 and 9 are arranged at different addresses in the address space described above, and the setting of the addresses is switched to select them.
[0096]
Thereafter, the bus connection of the 1394 I / F circuit 5 is restored in order to reconstruct the management structure of the 1394 bus 13 in the reset state. Thus, the electronic device of this embodiment is subsequently defined as a digital still image camera & recorder having a still image sub-communication protocol by the new bus management structure and the node information in the second configuration ROM 9. Here, this definition is detected by the root node controlling the bus management in the system of FIG. 5 and recognized above the system.
[0097]
Thus, when the electronic device of this embodiment operates as a digital still image camera & recorder, a personal computer is generally assumed as the counterpart node. At this time, the image signal picked up by the image pickup unit 1 is converted by the camera processing unit 3 into image data in a form required by the personal computer (PC), and the baseband image signal sig2 is passed through the switch circuit 4 and the 1394 I / F circuit 5 to 1394 bus 13 to be sent to a personal computer (PC). At this time, the still image sub-communication protocol is used.
[0098]
At the same time, a command is sent from the PC and is stored in the C & S register 10 to set the digital still image camera & recorder. At this time, the digital video camera and recorder unit (first unit) is not visible from the 1394 bus 13.
[0099]
FIG. 11 is a flowchart showing the switching operation between the digital video (moving image) apparatus and the digital camera (still image) apparatus in the present embodiment as described above. The controller 6 incorporates a sub-communication protocol used during communication using software and the first and second units along the flow.
[0100]
In FIG. 11, first in step S1, the controller 6 detects whether or not the device mode has changed, that is, whether or not the video / camera switch means 12 has been switched. When the mode change is detected, the process proceeds to step S2 to start the reset operation of the 1394 bus 13 and temporarily stop the bus control in the 1394 serial bus I / F circuit 5.
[0101]
In step S3, whether the electronic apparatus of this embodiment has been switched to the digital video camera & recorder (first unit) by operating the video / camera switch means 12, or the digital still image camera & recorder (second unit). ) Is determined.
[0102]
If the digital video (video camera & recorder) has been switched, the process proceeds to step S4, where unit control corresponding to the digital video system configuration is performed, and in step S5, the C & S register 10 is set for digital video. At the same time, in order to set the node information of the 1394 I / F circuit 5 to the information stored in the first configuration ROM 8 in step S6, the address setting of the I / F control and address conversion circuit 7 is changed.
[0103]
On the other hand, if it is determined in step S3 that the digital camera (still image camera & recorder) has been switched, the process proceeds to step S7, where unit control corresponding to the system configuration of the digital camera is performed, and in step S8, the C & S register 10 Is set for the digital camera, and the address information of the I / F control and address conversion circuit 7 is set to set the node information of the 1394 I / F circuit 5 to the information stored in the second configuration ROM 9 in step S9. Change the setting.
[0104]
After the processing of steps S4 to S6 or steps S7 to S9, in step S10, the reset state of the 1394 bus 13 started in step S2 is canceled, and the bus connection of the 1394 I / F circuit 5 is restored. . Then, in the next step S11, a new bus management process is performed by the root node after switching, so that the electronic apparatus according to the present embodiment can be changed to a digital video camera & recorder having an AV / C protocol or a stationary according to the contents of the configuration ROM 8 or 9. Recognize as a still image camera & recorder having a sub-communication protocol
[0105]
As described in detail above, according to the present embodiment, data communication can be performed via the 1394 I / F circuit 5 by selectively using different sub-communication protocols. In this case, a device (a device having a configuration as shown in FIG. 5) in which a plurality of units that cannot operate at the same time are built in does not need to have a C & S register 10 for each unit. In addition, when the node information needs to be changed due to attachment or the like, the management structure of the 1394 bus 13 can be reset independently.
[0106]
【The invention's effect】
  According to the present invention, it is possible to easily use a plurality of functional units and a communication protocol corresponding to each of the plurality of functional units..
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an example of a communication system configured using a 1394 serial bus.
FIG. 2 is a diagram illustrating a layer structure of a 1394 serial bus.
FIG. 3 is a diagram for explaining address space allocation in a 1394 serial bus;
FIG. 4 is a diagram showing data arranged in a configuration ROM to which addresses are assigned in FIG. 3;
FIG. 5 is a diagram showing a communication system as one embodiment of the present invention.
6 is a diagram for explaining a communication cycle in the system of FIG. 5; FIG.
7 is a diagram showing a detailed configuration of a camera and recorder in the system of FIG.
8 is a diagram for explaining node information stored as a configuration ROM of the apparatus in FIG. 7; FIG.
9 is a diagram showing a data arrangement in a packet communicated by each sub-communication protocol executed in the apparatus of FIG. 7. FIG.
FIG. 10 is a diagram showing FIG. 9 in more detail.
11 is a flowchart for explaining an operation of selecting a function and a sub-communication protocol in the system of FIG.
[Explanation of symbols]
1 Imaging unit
2 Video processing section
3 Digital camera processing section
4 Switch circuit
5 Interface (I / F) circuit
6 Interface controller
7 Interface control and address conversion circuit
8, 9 Configuration ROM
10 C & S (command & status) register
11 Control unit
12 Video / Camera switch
13 IEEE1394 serial bus
19 Bus reset circuit
20 Recording / playback unit

Claims (24)

An electronic device having a first functional unit and a second functional unit,
A first operation mode for operating the electronic device as an electronic device having the first functional unit and enabling a communication protocol for the first functional unit;
A second operation mode for operating the electronic device as an electronic device having the second functional unit and allowing a communication protocol for the second functional unit to be used;
Selecting means for selecting the first operation mode or the second operation mode;
Communication for operating the electronic device as an electronic device having the first functional unit and performing communication between the electronic device and another electronic device when the first operation mode is selected. Let the means reset the bus,
When the second operation mode is selected, the electronic device is caused to operate as an electronic device having the second functional unit, and the communication unit performs a bus reset.   2. The electronic apparatus according to claim 1, wherein the communication unit is a communication unit connected to an IEEE 1394-1995 serial bus. The first functional unit is a functional unit that processes a still image;
The electronic device according to claim 1, wherein the second functional unit is a functional unit that processes a moving image. The first functional unit is a functional unit that generates a still image using an imaging unit that captures an image,
The electronic device according to claim 1, wherein the second functional unit is a functional unit that generates a moving image using an imaging unit that captures an image.   5. The electronic apparatus according to claim 1, further comprising a recording unit configured to record a still image from the first functional unit or a moving image from the second functional unit on a recording medium. . When the first operation mode is selected, the electronic device is not operated as an electronic device having the second functional unit, and the communication protocol for the second functional unit is not allowed to be used. ,
When the second operation mode is selected, the electronic device is not operated as an electronic device having the first functional unit, and the communication protocol for the first functional unit cannot be used. The electronic device according to claim 1, wherein the electronic device is an electronic device. A first functional unit and a second functional unit;
A first operation mode for operating the electronic device as an electronic device having the first functional unit and enabling a communication protocol for the first functional unit;
A second operation mode for operating the electronic device as an electronic device having the second functional unit and allowing a communication protocol for the second functional unit to be used;
A control method for controlling an electronic device having selection means for selecting the first operation mode or the second operation mode,
Communication for operating the electronic device as an electronic device having the first functional unit and performing communication between the electronic device and another electronic device when the first operation mode is selected. Causing the means to perform a bus reset; and
A step of causing the electronic device to operate as an electronic device having the second functional unit and causing the communication means to perform a bus reset when the second operation mode is selected. Control method.   8. The control method according to claim 7, wherein the communication unit is a communication unit connected to an IEEE 1394-1995 serial bus. The first functional unit is a functional unit that processes a still image;
9. The control method according to claim 7, wherein the second functional unit is a functional unit that processes a moving image. The first functional unit is a functional unit that generates a still image using an imaging unit that captures an image,
The control method according to claim 7, wherein the second functional unit is a functional unit that generates a moving image using an imaging unit that captures an image.   11. The control method according to claim 7, further comprising recording means for recording a still image from the first functional unit or a moving image from the second functional unit on a recording medium. . When the first operation mode is selected, the electronic device is not allowed to operate as an electronic device having the second functional unit, and the communication protocol for the second functional unit cannot be used. And a process of
When the second operation mode is selected, the electronic device is not operated as an electronic device having the first functional unit, and the communication protocol for the first functional unit cannot be used. The control method according to claim 7, further comprising a step of: An electronic device having a first functional unit and a second functional unit,
A first operation mode for operating the electronic device as an electronic device having the first functional unit and enabling a communication protocol for the first functional unit;
A second operation mode for operating the electronic device as an electronic device having the second functional unit and allowing a communication protocol for the second functional unit to be used;
Selecting means for selecting the first operation mode or the second operation mode;
When the first operation mode is selected, the electronic device is not operated as an electronic device having the second functional unit, and the communication protocol for the second functional unit is not allowed to be used. ,
When the second operation mode is selected, the electronic device is not operated as an electronic device having the first functional unit, and the communication protocol for the first functional unit cannot be used. An electronic device characterized by that.   14. The electronic apparatus according to claim 13, wherein the communication unit is a communication unit connected to an IEEE 1394-1995 serial bus. The first functional unit is a functional unit that processes a still image;
15. The electronic device according to claim 13, wherein the second functional unit is a functional unit that processes a moving image. The first functional unit is a functional unit that generates a still image using an imaging unit that captures an image,
16. The electronic apparatus according to claim 13, wherein the second functional unit is a functional unit that generates a moving image using an imaging unit that captures an image.   17. The electronic apparatus according to claim 13, further comprising recording means for recording a still image from the first functional unit or a moving image from the second functional unit on a recording medium. . Communication for operating the electronic device as an electronic device having the first functional unit and performing communication between the electronic device and another electronic device when the first operation mode is selected. Let the means reset the bus,
14. When the second operation mode is selected, the electronic device is operated as an electronic device having the second functional unit, and the communication unit is caused to perform a bus reset. The electronic device according to any one of 17. A first functional unit and a second functional unit;
A first operation mode for operating the electronic device as an electronic device having the first functional unit and enabling a communication protocol for the first functional unit;
A second operation mode for operating the electronic device as an electronic device having the second functional unit and allowing a communication protocol for the second functional unit to be used;
A control method for controlling an electronic device having selection means for selecting the first operation mode or the second operation mode,
When the first operation mode is selected, the electronic device is not allowed to operate as an electronic device having the second functional unit, and the communication protocol for the second functional unit cannot be used. And a process of
When the second operation mode is selected, the electronic device is not operated as an electronic device having the first functional unit, and the communication protocol for the first functional unit cannot be used. A control method comprising the steps of:   20. The control method according to claim 19, wherein the communication unit is a communication unit connected to an IEEE 1394-1995 serial bus. The first functional unit is a functional unit that processes a still image;
The control method according to claim 19 or 20, wherein the second functional unit is a functional unit that processes a moving image. The first functional unit is a functional unit that generates a still image using an imaging unit that captures an image,
The control method according to any one of claims 19 to 21, wherein the second functional unit is a functional unit that generates a moving image using an imaging unit that captures an image.   23. The control method according to claim 19, further comprising recording means for recording a still image from the first functional unit or a moving image from the second functional unit on a recording medium. . Communication for operating the electronic device as an electronic device having the first functional unit and performing communication between the electronic device and another electronic device when the first operation mode is selected. Causing the means to perform a bus reset; and
A step of causing the electronic device to operate as an electronic device having the second functional unit and causing the communication means to perform a bus reset when the second operation mode is selected. The control method according to any one of claims 19 to 23.

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