JP2002202947A - Image processor, control method thereof, and storage medium with program stored therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make smoothly restartable an interrupted job without performing the job only with processed data or destroying the data even in the occurrence of a bus reset in a system connected through a 1394 serial bus. SOLUTION: A printer is provided with a bus monitoring circuit, and a printer controlled holds, with a bus reset signal as trigger, a job under execution for a period of performing the reconstruction of a network and until the continuation data of the job are transmitted and releases the hold when the data transfer is restarted. Even if a bus reset is generated during the transfer of printing information from a PC to the printer, the job based on the printing information is never error-ended, and the transfer of the printing information from a recording regeneration device or PC to the printer is smoothly performed after the reconfiguration of the network. Further, even if the bus reset is generated during the transfer of the printing information from the recording regeneration device or PC to the printer, no data slippage is caused in the print output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image processing apparatus, a control method therefor, and a storage medium storing a program, for example, a printer connected to a serial bus for transferring data and a control method therefor.

[0002]

2. Description of the Related Art With the advent of home digital video cams and digital video discs (DVDs), it has become necessary to transfer data having a large amount of information such as video data and audio data in real time. In order to transfer video data and audio data (hereinafter referred to as "real-time data") that requires real-time transfer to a personal computer (PC) or other digital equipment, an interface capable of real-time high-speed transfer is required. In other words, IEEE 1394-1995 (High
Performance Serial Bus). In the following, 139
Called 4 serial bus.

In the 1394 serial bus, each connected device (node) is given a unique node ID and recognized as a network configuration. When a change in the network configuration occurs, for example, when the number of nodes increases or decreases due to connection / disconnection of a node, power on / off, etc., it is necessary to newly recognize the network configuration. A bus reset signal is transmitted by the node that has detected the change in the network configuration, and all the nodes enter a mode of recognizing a new network configuration.

[0004] The detection of the change in the network configuration includes the following steps.
This is performed by detecting a change in the bias voltage at the 394 serial bus port. A bus reset signal is transmitted from a certain node, and the physical layer of each node receiving the bus reset signal transmits the occurrence of a bus reset to the link layer and relays the bus reset signal to another node. Finally, after all the nodes detect the bus reset signal, the bus reset is performed. The bus reset may be detected and activated by hardware due to disconnection or connection of the node due to the disconnection or connection of the bus cable as described above, or may be activated by a bus reset instruction according to a protocol. .

[0005] The 1394 serial bus can transfer not only real-time data but also an interface for a computer peripheral device, for example, a personal computer and a storage device such as a hard disk. In addition, 1
Since a host device is not required for the 394 serial bus, a digital camera and a printer can be directly connected, and an image captured by the digital camera can be printed by the printer. As a reference, "IEEE Std
1394-1995, Standard for a High Performance Serial
Bus. "

[0006]

When a bus reset is activated in the 1394 serial bus, data transfer is performed.
Suspended and resumed after new network configuration is recognized. Therefore, for example, if a bus reset occurs during transmission of print data from the digital camera to the printer, the printer enters a data waiting state. If the data waiting state continues for a certain time or more, the printer generates a timeout error. When a time-out error occurs, printing is performed using only the already received data, or the already received data is discarded. In addition, a new network is formed and data transfer is restarted, but data is not always transferred again.

As a method for solving this problem, Japanese Patent Laid-Open No.
Although there is 194902, there is a problem with the invention only when a device waiting for output tries to output immediately after the bus reset, and since only the part of the network configuration following the bus reset is focused on, the job There is a possibility that the image processing apparatus side times out while the node that has transmitted the image is performing internal processing due to the bus reset.

The present invention has been made to solve the above-described problem. Even when a bus reset occurs, a job is performed only with data that has already undergone image processing, or data that has already undergone image processing is discarded. It is an object of the present invention to provide an image processing apparatus and a control method thereof that do not occur. It is another object of the present invention to provide an image processing apparatus capable of smoothly restarting a job interrupted by a bus reset and a control method thereof.

[0009]

The present invention has the following arrangement as means for achieving the above object. An image processing apparatus according to the present invention includes an image processing means for processing image data received via a serial bus, a bus reset signal transmitted through the serial bus, and a serial bus upon detecting the bus reset signal. A recognizing means for recognizing a network configuration to be performed, and a control means for supplying a hold signal for holding a running job to the image processing means when a bus reset signal is detected, and maintaining the hold signal until a predetermined condition is satisfied. And characterized in that:

A control method according to the present invention is a control method for an image processing apparatus having image processing means for processing image data received via a serial bus. Upon detection, when a bus reset signal is detected, a hold signal for holding the job being executed is supplied to the image processing means, and the hold signal is maintained until a predetermined condition is satisfied.

The storage medium storing the program according to the present invention is a storage medium storing a program code of a control method of an image processing apparatus having image processing means for processing image data received via a serial bus. A code for a step of detecting a bus reset signal transmitted through the serial bus; a code of a step of supplying a hold signal for holding a running job to the image processing means when the bus reset is detected; A code for releasing the hold signal when a predetermined condition is satisfied after the detection of the signal.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image processing apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. [Bus reset monitoring] Receiving a bus reset command,
Alternatively, a bus reset signal is generated by using a change in the state of the serial bus such as connection or disconnection of a node or a change in power supply voltage as a trigger to start a bus reset process. FIG. 8 is a diagram showing a bus reset state machine. The 1394 serial bus and the controller recognize the bus reset by monitoring the reset start state, that is, the four states of the state steps S01 and S02. In the state step S01, the physical layer (physical layer: PH) detects the interrupt signal bus_reset_signal in the status information of the arbitration signal, and starts the bus reset.

In a state step S02, a bus reset is started in the following three states. (1) When a physical layer control request (PH_CONT.req) is generated by serial bus management, (2) When the physical layer detects a change in a node, (3) When the physical layer is in an undefined state, that is, In the state in which neither the idle state nor the wait state is performed, and no data is transmitted or received. In this case, a bus reset is started. In FIG. 8, state step S0 indicates the start of reset, that is, a state in which the node is transmitting a bus reset signal, and state step S1 indicates a state of waiting for reset, that is, a state of waiting for all ports to be in an idle state. The state step S2 indicates that the reset has been completed, that is, all the ports are in the idle state.

Next, 13 after the bus reset occurs.
The operation of the 94 serial bus will be described. [Sequence of Node ID Determination] After the bus reset, each node starts an operation of assigning an ID to each node in order to recognize and construct a new network configuration. The sequence from the bus reset to the determination of the node ID will be described with reference to the flowcharts shown in FIGS.

FIG. 2 is a flowchart showing a series of sequence examples from the generation of the bus reset signal to the determination of the node ID and the start of data transfer. Each node constantly monitors the occurrence of the bus reset signal in step S101, and proceeds to step S102 when the bus reset signal is generated. Then, in order to obtain a new network configuration in a state where the network configuration is reset, a parent-child relationship is declared between the nodes directly connected to each other, and it is determined that the parent-child relationship has been determined between all the nodes by the determination in step S103. Until step S102
Is repeated. When the parent-child relationship is determined, step S10
The process proceeds to step S4, where a root node is determined. In step S105, a node ID setting operation for giving an ID to each node is performed. Node IDs are set in a predetermined node order from the root node, and step S105 is repeated until it is determined in step S106 that all nodes have been given IDs.

When the setting of the node ID is completed, the new network configuration has been recognized by all the nodes, so that data transfer between the nodes can be performed. In step S107, the data transfer is started, and the sequence is started. Returning to step S101, the occurrence of the bus reset signal is monitored again.

FIG. 9 shows the determination of the root node from the monitoring of the bus reset signal (step S101) (step S10).
FIG. 3 is a flowchart showing a detailed example up to 4). FIG. 3 shows node ID setting (steps S105 and S106).
6 is a flowchart showing a detailed example of the above. The occurrence of a bus reset signal is monitored in step S201 in FIG. 9, and when the bus reset signal is generated, the network configuration is reset once. Next, in step S202, as a first step of re-recognizing the reset network configuration,
Each device resets the flag FL with data indicating that it is a leaf node. Then, in step S203, each device checks the number of ports, that is, the number of other nodes connected to itself, and in step S204, according to the result of step S203, to start declaring a parent-child relationship, an undefined Check the number of ports (parent-child relationship has not been determined).

The number of undefined ports is equal to the number of ports immediately after the bus reset, but as the parent-child relationship is determined, the number of undefined ports detected in step S204 decreases. Declaring a parent-child relationship immediately after a bus reset is limited to actual leaf nodes. Whether the node is a leaf node can be known from the result of checking the number of ports in step S203. That is, if the number of ports is "1", the node is a leaf node. In step S205, the leaf node declares a parent-child relationship “I am a child and the other party is a parent” with respect to the connection partner node, and ends the operation.

On the other hand, if the number of ports is "2" in step S203.
Immediately after the bus reset, since the number of undefined ports is “1”, the process proceeds to step S206, where data indicating the branch node is set in the flag FL. Wait for the parent-child relationship to be declared. A parent-child relationship is declared from another node, and the branch node that has received the parent-child relationship
Returning to step 204, the number of undefined ports is checked. If the number of undefined ports is "1", in step S205, "oneself is a child and the other is a parent" is sent to another node connected to the remaining port. Can declare a parent-child relationship. The branch node whose undefined port number is “2 or more” still waits for another node to declare a parent-child relationship in step S207.

The number of undefined ports of any one branch node (or, in exceptional cases, a leaf node that could not be operated quickly despite being able to declare a child) is “0”
, The declaration of the parent-child relationship of the entire network has been completed, and the only node whose undefined port number has become “0”, that is, the node that has been determined to be the parent of all nodes,
In step S208, data indicating the root node is set in the flag FL, and in step S209, the data is recognized as the root node. Thus, the procedure from the bus reset to the declaration of the parent-child relationship between all the nodes in the network is completed.

Next, a procedure for giving an ID to each node will be described. First, the leaf node can set the ID. Then, an ID is set from a young number (node number: 0) in the order of leaf → branch → root.
In step S301 in FIG. 3, the process branches to processing according to the type of node, that is, leaf, branch, and route, based on the data set in the flag FL. First, in the case of a leaf node, in step S302, the number (natural number) of leaf nodes existing in the network is set as a variable N, and then in step S303, each leaf node requests a node number from the root node. If there are multiple requests for this,
The root node performs arbitration in step S304, assigns a node number to one node in step S305, and notifies another node of a result indicating that acquisition of the node number has failed. The leaf node recognizing the failure in acquiring the node number by the determination in step S306 repeats the request for the node number again in step S303.

On the other hand, in step S307, the leaf nodes that have been able to acquire the node numbers notify all the nodes by broadcasting ID information including the acquired node numbers. When the broadcast of the ID information ends, in step S308, the variable N representing the number of leaves is decremented. Steps S303 to S30 are performed until the variable N becomes “0” as determined in step S309.
Step 8 is repeated, and after the ID information of all leaf nodes has been broadcasted, the process proceeds to step S310, and the process proceeds to setting the ID of the branch node. The ID setting of the branch node is performed in substantially the same manner as the leaf node.

First, in step S310, the number (natural number) of branch nodes existing in the network is set as a variable M, and in step S311 each branch node requests a node number from the root node. In response to this request, the root node performs arbitration in step S312, assigns a small number following the leaf node to one branch node in step S313, and indicates that the branch node for which the node number could not be obtained indicates an acquisition failure. Notify. By the determination in step S314,
The branch node that has recognized the failure to acquire the node number repeats the request for the node number again in step S311.

On the other hand, in step S315, the branch node that has obtained the node number notifies all the nodes by broadcasting ID information including the obtained node number. When the broadcast of the ID information ends, the variable M representing the number of branches is decremented in step S316. Then, according to the determination in step S317, the variable M
From step S311 until step S3 until
16 steps are repeated, and the IDs of all branch nodes
After the information is broadcast, the process proceeds to step S318, and the process proceeds to setting the ID of the root node. When the process ends so far, the root node is the only node that has not finally acquired an ID. Therefore, in step S318, the lowest number not assigned to another node is set as its own node number. Broadcast ID information. Thus, the procedure up to setting the IDs of all the nodes is completed.

[Network Configuration] FIG. 4 shows a personal computer (PC) 103 and a recording / reproducing device 10 as examples of devices interconnected by a 1394 serial bus.
1 is a block diagram showing an example of a network of a printer 1 and a printer 102. FIG. In the recording / reproducing apparatus 101, reference numeral 4 denotes an imaging system including a lens and a CCD, 5 denotes an A / D converter,
6 is a video (image) signal processing circuit, 7 is a compression / expansion circuit for compressing and expanding video (image) data by a predetermined algorithm, 8 is a magnetic tape or magnetic disk and its recording / reproducing head, PC card and its driver and connector A recording / reproducing system including: a system controller 9; an operation unit 10 for inputting an instruction; 11 a D / A converter;
Denotes an electronic viewfinder (EVF) serving as a display unit;
Is a frame memory for storing video (image) data to be transferred uncompressed; 14 is a memory control unit for controlling reading of the memory 13; 15 is a frame memory for storing video (image) data to be transferred in a compressed state , 16 is the memory 1
Reference numeral 17 denotes a data controller, and reference numeral 18 denotes an interface unit of a 1394 serial bus.

In the printer 102, 19 is 1
An interface section of a 394 serial bus, 20 a data selector, 21 a decoding circuit for decoding (expanding) video (image) data compressed by a predetermined algorithm,
22, an image processing circuit for performing image processing on an image to be printed; 23, a memory for forming an image to be printed;
24, a printer head; 25, a driver for scanning and paper feeding of the printer head; 26, a printer controller as a control unit of the printer 102; and 27, an operation unit for inputting instructions. In the PC 103, 61 is 1
394 serial bus interface, 62 is PCI
(Peripheral Component Interconnect) bus, 63 is M
PU, 64 is a decoding circuit for decoding (expanding) video (image) data compressed by a predetermined algorithm, 65 is a display having a built-in D / A converter and video memory, 66 is a hard disk, 67 is RAM, ROM, etc. Reference numeral 68 denotes an operation unit including a keyboard and a mouse.

[Operation of Recording / Reproducing Apparatus 101] First, the operation of the recording / reproducing apparatus 101 will be described. Video (image)
At the time of data recording, a video (image) signal output from the imaging system 4 is digitized by an A / D converter 5 and then processed by a video (image) signal processing circuit 6. One of the outputs of the video (image) signal processing circuit 6 is converted back to an analog signal by the D / A converter 11 as a video (image) during shooting, and is displayed on the EVF 12. Other outputs are subjected to compression processing by a compression circuit 7 according to a predetermined algorithm, and are recorded on a recording medium by a recording / reproducing system 8.

Here, the compression processing of the predetermined algorithm is performed by a typical JP still digital camera (DSC).
EG system, DCT (discrete cosine transform) and VLC, which are typical band compression methods for home digital video
A compression method based on (variable length coding), an MPEG method, or the like is used. When reproducing video (image) data, the recording / reproducing system 8 reproduces a desired video (image) from a recording medium. At this time, under the control of the system controller 9, a video (image) desired by the user is selected and reproduced based on the instruction input from the operation unit 10. Of the video (image) data reproduced from the recording medium, data that is transferred while being compressed is output to the frame memory 15. When the reproduction data is expanded to transfer the uncompressed data, the video (image) data expanded by the expansion circuit 7 is output to the frame memory 13.

The reproduced video (image) data is stored in an EV
When displaying on the F12, the video (image) data expanded by the expansion circuit 7 is converted into an analog signal by the D / A converter 11 and displayed on the EVF12. The read / write of the frame memories 13 and 15 is controlled by the memory controllers 14 and 16 controlled by the system controller 9, respectively, and the read video data is output to the data selector 17. Of course, the outputs of the frame memories 13 and 15 are controlled so as not to be input to the data selector 17 at the same timing.

The system controller 9 controls the operation of each unit in the recording / reproducing apparatus 101. The system controller 9 transmits control command data to external devices such as the printer 102 and the PC 103 from the data selector 17 via the 1394 serial bus. It can also be sent to external devices. The transmission and reception of the command at this time uses asynchronous transfer, and uses a data packet of a functional control protocol (Functional Control Protocol: FCP) to control a device on the 1394 serial bus.

Various command data transferred from the printer 102 or the PC 103 is input from the data selector 17 to the system controller 9.
The operation of each unit of the recording / reproducing apparatus 101 can be instructed. The command data indicating the presence / absence of a decoder for video data or the type of the decoder, which is transferred from the printer 102 or the PC 103, is input to the system controller 9 as a request command and then transmitted to the recording / reproducing apparatus 101. Used to select compression / non-compression of data.

That is, the system controller 9 transmits the command to the memory control unit 14 or 15 in response to the request command, and controls the video data corresponding to the request command to be read and transferred from the frame memory 13 or 15. I do. Specifically, the system controller 9 determines whether to transfer the compressed or uncompressed data based on the information of the decoder included in each device transferred as a command from the printer 102 or the PC 103.

That is, when it is determined that the compression method of the recording / reproducing apparatus 101 can be decoded, the compressed video data is transferred, and when it is determined that the decoding is impossible, the non-compressed video data is transferred. The video (image) data and command data input to the data selector 17 are 1
The data is transferred by the 394 interface unit 18 based on the specification of the 1394 serial bus, and
Received by C103. Command data is also appropriately transferred to the target node.

Regarding the data transfer method, mainly data such as moving images, still images and sounds are transferred as synchronous data using a CIP header as real-time data, and command data is transferred as asynchronous data transfer as FCP frame data. You. However, the still image data can also be sent by asynchronous transfer according to the transfer situation such as network traffic, if there is no need to guarantee real time.

[Operation of Printer 102] Next, the operation of the printer 102 will be described. The data input to the 1394 interface unit 19 is classified by the data selector 20 according to the type of data, and data to be printed such as video (image) data is expanded by the decoding circuit 21 when compressed. Thereafter, it is output to the image processing circuit 22. At this time, since the data compression method and compression / non-compression are set in the recording / reproducing apparatus 101 based on information such as the presence / absence or type of the decoder instructed to the recording / reproducing apparatus 101 in advance, the compressed data In the case of,
The data can be expanded by the decoding circuit 21 provided in the printer 102. Of course, the uncompressed data passes through the decoding circuit 21 and is directly input to the image processing circuit 22.

The data input to the image processing circuit 22 is
Here, image processing suitable for printing is performed, and the image is developed as print image data in the memory 23 whose read / write is controlled by the printer controller 26. The print image data in the memory 23 is sent to the printer head 24, and a visible image based on the print image data is printed on recording paper. A driver 25 that performs drive scanning and paper feeding of the printer head 24, the operation of the printer head 24, and the operations of other components are controlled by a printer controller 26. The operation unit 27 is for inputting instructions such as paper feed, reset, ink check, and standby / start / stop of printer operation.
The printer controller 26 controls the operation of each unit according to the instruction input.

Next, when the data input to the 1394 interface unit 19 is command data for the printer 102, the data is transmitted from the data selector 20 to the printer controller 26 as a control command. The operation of each unit is controlled according to the command.

As for the decoding circuit 21, the JPEG system can be considered as an example of the encoding system supported by the decoder provided in the printer. Decoding of JPEG encoded data can be performed by hardware or software. Therefore, a decoder that holds JPEG decoding program files in ROM in the decoding circuit 21 or decodes JPEG-encoded data by software by a method such as having a decoding program transferred from another node may be used. If the JPEG-encoded image data is transferred from the recording / reproducing apparatus 101 to the printer 102 and decoded in the printer 102, the transfer efficiency is higher than the transfer after returning to the uncompressed data. Nor. Further, if decoding is performed by software, the cost of the decoding circuit 21 of the printer 102 is reduced, which is convenient.

As described above, the operation in which image data is transferred from the recording / reproducing apparatus 101 to the printer 102 and printed is so-called direct printing, and printing can be performed without requiring processing by the PC 103. It is also possible to send data from the PC 103 and perform printing as a normal printer. At this time, the print data sent from the PC 103 is transmitted from the data selector to the printer controller 26, developed in the memory 23 as a print image, and the print image data in the memory 23 is printed on the recording paper by the same control as described above.

[Process of PC 103] Next, the process of the PC 103 will be described. PC1 from recording / reproducing device 101
The video (image) data transferred to the 1394 interface unit 61 of the PC 103 is transmitted to the PC 103 via the PCI bus 62.
Is transferred to each part in The MPU 63 performs various kinds of processing using the memory 67 as a work memory in accordance with an instruction input from the operation unit 68, an operating system (OS), and application software, and transfers the transferred video (image).
The data is recorded on the hard disk 66.

Here, the data compression method and compression / non-compression are set in the recording / reproducing apparatus 101 based on information such as the presence / absence or type of the decoder instructed to the recording / reproducing apparatus 101 in advance. If the data is
It can be expanded by the decoding circuit 64 provided in C103. Therefore, when the video (image) data is displayed on the display 65, the compressed video (image) data is decoded (expanded) by the decoding circuit 64 and input to the display 65, and the uncompressed video (image) data is directly displayed on the display 65. The data is input to the input terminal 65 and D / A converted and displayed.

As the decoding circuit 64, JPEG or MPE
Examples include a decoder card of the G system or the like incorporated in a motherboard, and decoder software stored in a ROM or the like. In this way, the transferred video (image) data is input to the PC 103, where processing such as recording, display, and editing is performed, and further, the PC 103 is also transferred to another device. Further, data generated or processed by the PC 103 can be transferred to the printer 102 as print data and printed.

[Data Transfer Procedure] Next, a procedure for transmitting print information from the PC 103 to the printer 102 by using the recording / reproducing apparatus 101 as a root by asynchronous transfer will be described. The PC 103 is a recording / reproducing apparatus 101 which is a root.
Request mediation for. On the other hand, the recording / reproducing device 1
01 performs arbitration of the 1394 serial bus, and the PC 103
From the printer 102 to the printer 102. When the data transfer becomes possible, the PC 103 stores the non-volatile memory of the memory 67, the printer 102 stores the non-volatile memory of the memory 23, the partner node ID composed of 64 bits as shown in FIG. Are respectively stored.

The print information sent from the PC 103 is received by the 1394 interface unit 19 of the printer 102 and is latched by the data selector 20 in 8-bit units. The latched data has an 8N-bit configuration and is stored in the memory 23 via the printer controller 26. When a bus reset occurs while print information is being received, the data selector 20 sends the printer controller 26
Since no data is sent, the printer controller 26 enters a standby state.

As described above, in the 1394 serial bus, after a bus reset occurs, the network configuration is reconstructed.
If no data is sent for a certain period of time, a timeout error occurs, and reception of print information is interrupted.
When a timeout error occurs, the printer 102 suspends the printing process, and performs printing based only on the print information already stored in the memory 23, or deletes or invalidates the print information stored in the memory 23. Therefore,
After the start of the reception of the print information, the occurrence of the timeout error can be suppressed by causing the printer controller to execute a process illustrated in the flowchart of FIG. 1.

That is, the printer controller 26 monitors the occurrence of the bus reset in step S108, and once the bus reset occurs, temporarily holds the data processing (step S109). Then, the completion of the reconfiguration of the network configuration is monitored in step S110, and when the reconfiguration of the network configuration is completed, the data processing is restarted in step S111. By performing the processing of FIG. 1,
The printer controller 26 resumes the data transfer without generating a time-out error (or a communication error) when the network configuration is reconstructed by the bus reset even if the data waiting state continues. Thereafter, the printing process can be resumed and continued.

[Bus Monitoring] FIG. 7 is a block diagram showing an example of the configuration of a printer for bus monitoring. The data selector 20 sends a job receiving signal to the bus monitoring circuit 28 while receiving a job from the 1394 interface unit 19. When the bus reset signal is received by the 1394 interface unit 19, the data selector 20
The reset information is sent to the bus monitoring circuit 28. The bus monitoring circuit 28 sends a Hold signal to the printer controller 26 to hold data processing.

Upon receiving the Hold signal, the printer controller 26 temporarily stops the currently executing job.
When the network configuration is reconstructed, the data selector 2
0 indicates whether or not the node transmitting the job exists on the network after the reconstruction is completed, for example, G
The inspection is performed by reading a device unique number, also called a UID (Global Unique ID). If the node transmitting the job is disconnected from the network, the data selector 20 outputs a reset signal to the bus monitoring circuit 28, and the bus monitoring circuit 28 resets the Hold signal, and at the same time, resets the job cancel signal. Is generated, and the printer controller 26 deletes the stopped job.

When the transmission of the job data is restarted from the node which has transmitted the data, the data selector 20
Sends a job receiving signal to the bus monitoring circuit 28,
The bus monitoring circuit 28 releases the Hold signal. As a result, the printer controller 26 recognizes that valid job data has flown again, and restarts the stopped job.

Further, the bus monitoring circuit 28 which has received the bus reset information starts a timer internally, so that the job data transmission from the node which has transmitted the job within a predetermined time is started, and the data selector 20 is receiving the job. When no signal is sent, the Hold signal is released and a job cancel signal is generated at the same time, and the printer controller 26 deletes the stopped job. At the same time, the bus monitoring circuit 28 also notifies the data selector 10 of the time-out, and the data selector 20 enables job reception from another node. Until then, the data selector 20 is configured not to accept a job request from another node. As a result, even when a request for an output job is issued from a node other than the node that has transmitted the job immediately after the bus reset, the output can be controlled without confusing the two jobs.

As described above, the provision of the bus monitoring circuit 28 causes the printer controller 26 to hold the job currently being executed, for example, the data processing currently being received, by using the bus reset signal as a trigger. Then, the job is held for a period during which the network configuration is being reconstructed and thereafter until the continuation data of the job is sent. When the data transfer is resumed, the job is released.

By this processing, even if a bus reset occurs during the transmission of print information from the PC 103 to the printer 102, the job based on the print information is not terminated with an error, and the network configuration is reconstructed. In addition, transmission of print information from the recording / reproducing apparatus 101 or the PC 103 to the printer 102 can be performed smoothly. Further, the recording / reproducing apparatus 101 and the PC 103 transmit the printer 1
Even if a bus reset occurs during the transmission of the print information to the print information 02, a correct print output can be obtained without data loss occurring in the print output.

In the above, the embodiment has been described by taking the serial bus of the IEEE 1394 standard as an example, but the present invention is not limited to this, and the USB (Universal Serial
al Bus) standard serial bus is also applicable.

Even if the present invention is applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), a device including one device (for example, a copying machine, a facsimile) Device).

Another object of the present invention is to provide a storage medium storing a program code of software for realizing the functions of the above-described embodiments to a system or apparatus, and to provide a computer (or CPU) of the system or apparatus.
And MPU) by reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium implements the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.

When the computer executes the readout program code, not only the functions of the above-described embodiment are realized, but also the OS (Operating System) running on the computer based on the instruction of the program code. ) Performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments. Further, after the program code read from the storage medium is written in a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. It goes without saying that the CPU or the like provided in the card or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

[0057]

As described above, according to the present invention,
Even if a bus reset occurs, it is possible to provide an image processing apparatus and a control method thereof in which a job is not performed only with data that has already undergone image processing, and data that has already undergone image processing is not discarded. Further, it is possible to provide an image processing apparatus capable of smoothly restarting a job interrupted by a bus reset and a control method thereof. Furthermore, even if a job is sent from another node after the bus reset, the processing can be performed without confusing the two jobs.

According to the first aspect of the present invention, since the job hold signal is generated when a bus reset occurs, it is possible to prevent the image processing unit from timing out during the processing accompanying the bus reset.

According to the second aspect of the present invention, it is only necessary to release the hold signal when the recognition of the network configuration is completed, so that the circuit configuration can be simplified.

According to the third aspect of the present invention, it is possible to receive an output request from another node by checking whether there is a node that has been transferring job data.

According to the fourth aspect of the present invention, by canceling a job when a node does not exist, an output from another node can be performed without waiting for a timeout or outputting corrupted data. Requests can be accepted.

According to the fifth aspect of the present invention, the hold signal is maintained even after the recognition of the network configuration is completed. Therefore, even if a node that has performed data output takes a long time to perform a process associated with the bus reset. It can be dealt with.

According to the sixth aspect of the invention, by adopting the 1394 standard, it is possible to connect moth with general-purpose equipment.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an example of processing to be executed by a printer controller after reception of print information is started.

FIG. 2 is a flowchart showing a sequence from a bus reset to a determination of a node ID.

FIG. 3 is a flowchart illustrating a detailed example of node ID setting.

FIG. 4 is a block diagram illustrating an example of a network of a personal computer (PC), a recording / reproducing device, and a printer interconnected by a 1394 serial bus.

FIG. 5 is a configuration diagram illustrating a configuration of a node ID.

FIG. 6 is a flowchart illustrating a detailed example from monitoring of a bus reset signal to determination of a root node.

FIG. 7 is a block diagram illustrating a configuration example for bus monitoring.

FIG. 8 is a configuration diagram illustrating a state machine of a bus reset.

[Explanation of symbols]

 19 1394 I / F 20 Data selector 26 Printer controller 28 Bus monitoring circuit 101 Recording / reproducing device 102 Printer 103 PC

Continued on the front page F-term (reference) 2C061 AP01 AP03 AP04 HJ06 HJ08 HQ20 5B014 HC02 HC07 HC13 5C052 AA11 AA17 CC11 FA02 FA03 FA04 FA06 FA07 FB01 GA02 GA03 GA05 GA07 GA09 GB06 GC05 GF01 5K033 AA05 AA07 DB01 DB01 CB01

Claims (8)

[Claims] 1. An image processing means for processing image data received via a serial bus, a detecting means for detecting a bus reset signal transmitted on the serial bus, and when the bus reset signal is detected. An image processing apparatus comprising: a control unit configured to supply a hold signal for holding a running job to the image processing unit and release the hold signal when a predetermined condition is satisfied. 2. When the bus reset signal is detected, a recognition unit for recognizing a network configuration constituted by a serial bus is provided, and the completion of the recognition of the network configuration is set as the predetermined condition, and the hold signal is released. The image processing apparatus according to claim 1, wherein: 3. A detecting means for recognizing a network configuration constituted by a serial bus upon detecting the bus reset signal, wherein the device which has transferred the image data is disconnected from the bus when the recognition of the network configuration is completed. 2. An image processing apparatus according to claim 1, wherein the image processing apparatus recognizes that the hold signal has been received, and releases the hold signal based on the predetermined condition. 4. The image processing apparatus according to claim 3, wherein when the device that has transferred the image data is disconnected from the bus, the hold signal is released and a job cancellation is notified to the image processing apparatus. Processing equipment. 5. When a device that has transferred image data to the image processing apparatus exists on the bus at the time when the network configuration is recognized after the bus reset, a hold signal is maintained, 5. The image processing apparatus according to claim 3, wherein the hold signal is released on condition that the device that has transferred the data has restarted the data transfer. 6. The image processing apparatus according to claim 1, wherein the serial bus conforms to or conforms to the IEEE 1394 standard. 7. A method for controlling an image processing apparatus comprising image processing means for processing image data received via a serial bus, comprising: detecting a bus reset signal transmitted on the serial bus; A control of the image processing apparatus, wherein when a bus reset signal is detected, a hold signal for holding a running job is supplied to the image processing means, and the hold signal is released when a predetermined condition is satisfied. Method. 8. A storage medium storing a program code of a control method of an image processing apparatus having image processing means for processing image data received via a serial bus, wherein the program code is transmitted through the serial bus. A code for detecting a bus reset signal, a code for supplying a hold signal for holding a job being executed when the bus reset is detected to the image processing means, and a predetermined code after the detection of the bus reset signal. And a code for canceling the hold signal when the condition is satisfied.