JP4093636B2 - Information processing apparatus and method, and recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information processing apparatus and method, and a recording medium, and more particularly, for example, an information processing apparatus and method, and a recording medium that can efficiently execute processing specified in a transaction layer in an IEEE1394 standard protocol, for example. About.
[0002]
[Prior art]
Recently, IEEE-1394 Hight Performance Serial Bus (hereinafter referred to as IEEE1394 serial bus) has been supported as an interface for communicating data and control signals between information processing devices such as computers and VCRs (Video Cassette Recorders). An interface (hereinafter referred to as IEEE1394 I / F) has attracted attention.
[0003]
FIG. 5 shows a configuration example of the conventional receiving unit 22 of the information processing apparatus 21 such as a computer or a VCR. The input unit 11 is connected to the IEEE1394 serial bus 10 and receives data transmitted on the IEEE1394 serial bus 10. Data transmitted on the IEEE1394 serial bus 10 includes a synchronous data packet for transmitting video data and audio data (hereinafter referred to as a synchronous packet) and an asynchronous data packet for transmitting a control signal (hereinafter asynchronously). For example, 125 μsec as a reference cycle and time-division multiplexed.
[0004]
Of the data received from the IEEE 1394 serial bus 10, the input unit 11 shows another case where an asynchronous packet (asynchronous packet) is a packet addressed to the information processing apparatus 21 or a synchronous packet (isochronous packet). The received data is output to the separator 12 when it has a channel number assigned to communication between the device and the information processing device 21.
[0005]
The separator 12 determines from the packet identification code written in the header of the data (packet) input from the input unit 11, and separates the input packet into a synchronous packet and an asynchronous packet. The separator 12 outputs a synchronous packet to an IRF (Isochronous Receive FIFO) 13 and outputs an asynchronous packet to an ARF (Asynchronous Receive FIFO) 14.
[0006]
The IRF 13 stores the input synchronous packets so that the synchronous data processing unit 15 reads them in the input order. The synchronous data processing unit 15 sequentially reads synchronous packets from the IRF 13 and executes predetermined processing.
[0007]
The ARF 14 stores the input asynchronous packets so that the asynchronous data processing unit 16 reads them in the input order. The asynchronous data processing unit 16 sequentially reads asynchronous packets from the ARF 14 and executes predetermined processing.
[0008]
The CPU 17 controls the synchronous data processing unit 15 and the asynchronous data processing unit 16 to execute various processes.
[0009]
Data can be received from the IEEE1394 serial bus 10 by the receiving unit 22 as an interface of the information processing apparatus 21 configured as described above.
[0010]
[Problems to be solved by the invention]
By the way, the transaction layer constituting the protocol of the IEEE1394 standard is required only for asynchronous packets, and performs processing for requesting activation of a predetermined service (request transaction) and processing for responding to the request (response transaction). For example, as shown in FIG. 6, when the node A receives a request transaction from the node B connected by the IEEE1394 serial bus, the node A executes a process corresponding to the request transaction, and returns a response as a processing result. Send the transaction to Node B. That is, in the information processing apparatus 21 in FIG. 5, the CPU 17 controls the asynchronous data processing unit 16 of the receiving unit 22 to execute processing corresponding to the request specified in the transaction layer.
[0011]
Further, according to the IEEE1394 standard, there is a rule that a node (information processing apparatus) that has received a request transaction must always transmit a response transaction to a transmission source within a predetermined time (for example, within 100 ms).
[0012]
For example, when the IEEE1394 serial bus 10 is reset, a request transaction for inquiring about the contents of the configuration ROM is output from a device (not shown). When the CPU 17 of the information processing device 21 receives such a request transaction, it needs to execute other processing and generate and output a response transaction. As a result, there is a problem that a large load is applied to the CPU 17 and the CPU 17 cannot execute a quick process at that time.
[0013]
The present invention has been made in view of such a situation. For example, it is possible to efficiently execute processing specified in a transaction layer.
[0014]
[Means for Solving the Problems]
The information processing apparatus according to claim 1 is a response corresponding to a request by asynchronous data when predetermined asynchronous data is received, and must be returned within a predetermined time after receiving the predetermined asynchronous data. If the data received by the receiving means is asynchronous data, the holding means for holding the predetermined information that constitutes the response to be received, the receiving means for receiving the data transmitted via the bus, and the received asynchronous Determining means for determining whether the holding means holds information that constitutes a response corresponding to a request by type data, and information constituting a response corresponding to a request by asynchronous data received by the judging means If the holding means is determined to be held, generates response information based on the information, a first output means for outputting to the bus If the holding means information that constitutes a response corresponding to the request by the received asynchronous data is determined not to be held by the determining means executes a predetermined process, the response information in accordance with the processing result And second output means for generating and outputting to the bus .
[0015]
The information processing method according to claim 3 is a response corresponding to a request by asynchronous data when predetermined asynchronous data is received, and must be returned within a predetermined time after receiving the predetermined asynchronous data. If the data received in the processing of the holding step that holds the predetermined information that constitutes the response to be received, the receiving step that receives data transmitted via the bus, and the processing of the receiving step is asynchronous data, it is received. A determination step for determining whether or not information constituting a response corresponding to a request based on asynchronous data is retained in the retention step process, and a request based on asynchronous data received in the determination step process If the information that constitutes the response is determined to be held in the process of holding step, less on the basis of the information It generates Nsu information, a first output step of outputting to the bus, holding step the information constituting the response corresponding to the request by the received asynchronous data in the process of determining step determines not to hold A second output step of executing predetermined processing, generating response information according to the processing result, and outputting the response information to the bus .
[0016]
The recording medium program according to claim 4 is a response corresponding to a request by asynchronous data when predetermined asynchronous data is received, and must be returned within a predetermined time after receiving the predetermined asynchronous data. A holding step that holds predetermined information that constitutes a response that must be received, a receiving step that receives data transmitted via the bus, and a data received in the processing of the receiving step is received when the data is asynchronous data. A determination step that determines whether or not the information that constitutes the response corresponding to the request by the asynchronous data received is retained by the retention step process, and the request by the asynchronous data received by the determination step process If the information that constitutes a response to is determined to be held in the process of holding step, based on the information Te generates response information, is determined and a first output step of outputting to the bus, the holding step the information constituting the response corresponding to the request by the received asynchronous data in the process of decision step does not hold In the case, the predetermined processing is executed, response information is generated according to the processing result, and processing including the second output step of outputting to the bus is executed.
[0017]
In the information processing apparatus according to claim 1, the information processing method according to claim 3, and the program of the recording medium according to claim 4, a request by asynchronous data when predetermined asynchronous data is received. Predetermined information that constitutes a response that must be returned within a predetermined time after receiving predetermined asynchronous data is held, and data transmitted via the bus is received and received If the received data is asynchronous data, it is determined whether the information constituting the response corresponding to the received request by asynchronous data is retained, and the response corresponding to the received request by asynchronous data is displayed. If information configuration is determined to be held, the response information is generated based on the information, is output to the bus, receiving If it is determined that the holding step does not hold the information that constitutes the response corresponding to the request by the asynchronous type data, a predetermined process is executed, and response information is generated according to the processing result. Is output .
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below, but in order to clarify the correspondence between each means of the invention described in the claims and the following embodiments, in parentheses after each means, The features of the present invention will be described with the corresponding embodiment (however, an example) added. However, of course, this description does not mean that each means is limited to the description.
[0019]
The information processing apparatus according to claim 1 is a response corresponding to a request by asynchronous data when predetermined asynchronous data is received, and must be returned within a predetermined time after receiving the predetermined asynchronous data. Holding means (for example, the register 54 in FIG. 2) that holds predetermined information that constitutes an unacceptable response, and receiving means (for example, the input unit 11 in FIG. 1) that receives data transmitted via the bus; When the data received by the receiving means is asynchronous data, a determining means for determining whether the holding means holds information constituting a response corresponding to the request by the received asynchronous data (for example, The holding unit holds information constituting a response corresponding to the request by the asynchronous data received by the control unit 52) and the determination unit in FIG. If it is a constant, generates response information based on the information, a first output means for outputting to the bus (e.g., automatic response unit 53 of FIG. 2) and, on request by the asynchronous data received by the determining means If it is determined that the information constituting the corresponding response is not held by the holding unit, a second process is executed to execute a predetermined process, generate response information according to the process result, and output the response information to the bus ( For example, the asynchronous data processing unit 16 and the CPU 17) of FIG. 1 are provided.
[0020]
FIG. 1 shows a configuration example of a transmission / reception apparatus 41 to which the present invention is applied. In addition, about the part corresponding to the case in FIG. 5, the same code | symbol is attached | subjected and the description is abbreviate | omitted suitably.
[0021]
The information processing apparatus 42 configured by a computer, a VCR, or the like has a transmission / reception apparatus 41 as an interface with the IEEE1394 serial bus 10.
[0022]
The input unit 11 of the transmission / reception device 41 is connected to the IEEE1394 serial bus 10 and receives data transmitted on the IEEE1394 serial bus 10. Of the data received from the IEEE1394 serial bus 10, the asynchronous packet is a packet addressed to the information processing device 42, or the synchronous packet is assigned to communication between another information processing device (not shown) and the information processing device 42. If the received channel number is included, the input unit 11 outputs the received data (packet) to the separator 31.
[0023]
The separator 31 determines the packet supplied from the input unit 11 from the packet identification code written in the packet header, and separates the packet into a synchronous packet and an asynchronous packet. The separator 31 outputs the synchronous packet to the IRF 13 and outputs the asynchronous packet to the request transaction processing unit 32.
[0024]
The IRF 13 stores the input synchronous packets so that the synchronous data processing unit 15 reads them in the input order. The synchronous data processing unit 15 sequentially reads synchronous packets from the IRF 13 and executes predetermined processing.
[0025]
When the request transaction specified in the transaction layer is a predetermined request transaction, the request transaction processing unit 32 generates a response transaction (response information) and outputs it to the IEEE1394 serial bus 10. The request transaction processing unit 32 also outputs the asynchronous packet to the ARF 14 when the request transaction is not a predetermined request transaction.
[0026]
The ARF 14 stores input asynchronous packets so that the asynchronous data processing unit 16 reads them in the input order. The asynchronous data processing unit 16 reads an asynchronous packet from the ARF 14 and executes predetermined processing.
[0027]
The CPU 17 of the information processing device 42 controls the synchronous data processing unit 15 and the asynchronous data processing unit 16 to execute various processes. The configuration ROM 33 connected to the CPU 17 stores predetermined information related to the information processing apparatus 42 in advance.
[0028]
FIG. 2 shows a configuration example of the request transaction processing unit 32. The analysis unit 51 analyzes the asynchronous packet input from the separator 31, extracts the source ID included in the header, and extracts a predetermined address specified in the transaction layer. The analysis unit 51 outputs the extracted address to the control unit 52. Further, the analysis unit 51 is controlled by the control unit 52 and outputs the extracted source ID to the auto response unit 53 or transfers the input asynchronous packet to the ARF 14. The source ID represents the node ID of the information processing apparatus that has transmitted the packet.
[0029]
As shown in FIG. 3, the register 54 has data (data a, b...) Out of data (data a, b...) Necessary for sending (replying) as a response transaction corresponding to the request transaction. Those already determined are registered together with the corresponding addresses (addresses A, B...). The register 54 is also controlled by the control unit 52 so that the stored address is output to the control unit 52 and the stored data is output to the auto response unit 53.
[0030]
The auto response unit 53 is controlled by the control unit 52, generates a response transaction packet based on the source ID input from the analysis unit 51 and the data input from the register 54, and outputs the response transaction packet to the IEEE1394 serial bus 10. It is made like that.
[0031]
The control unit 52 determines whether or not the address input from the analysis unit 51 exists in the address stored in the register 54, and based on the determination result, the analysis unit 51 and the auto response unit 53. , And the register 54 are controlled.
[0032]
Next, a processing procedure for generating a response transaction will be described with reference to the flowchart of FIG.
[0033]
In the case of this example, a request transaction for inquiring about the contents of the configuration ROM of the information processing apparatus 42 is transmitted from the information processing apparatus (sender) (not shown) connected to the IEEE1394 serial bus 12 together with the information processing apparatus 42. Shall be. That is, the request transaction includes an address stored in the register 54 as information indicating the type of inquiry.
[0034]
In step S1, when the analysis unit 51 of the request transaction processing unit 32 receives supply of an asynchronous packet from the separator 31, in step S2, from the supplied asynchronous packet, the source ID and the address specified in the transaction layer To extract.
[0035]
Next, in step S <b> 3, the analysis unit 51 outputs the address extracted in step S <b> 2 to the control unit 52. In step S <b> 4, the control unit 52 refers to the contents of the register 54 and determines whether the address output from the analysis unit 51 is stored in the register 54.
[0036]
If it is determined in step S4 that the address output from the analysis unit 51 is stored in the register 54, the process proceeds to step S5, and the control unit 52 instructs the auto response unit 53 to generate a response transaction. Thus, when the auto response unit 53 receives the data from the register 54 and the source ID from the analysis unit 51, the auto response unit 53 can generate a response transaction.
[0037]
Next, in step S6, the control unit 52 controls the register 54 to output data corresponding to the address extracted in step 2 to the auto response unit 53. In step S7, the control unit 52 controls the analysis unit 51. The source ID extracted in step S2 is output to the auto response unit 53.
[0038]
In step S <b> 8, the auto response unit 53 generates a response transaction packet based on the source ID from the analysis unit 51 and the data from the register 54, and outputs the response transaction packet to the IEEE1394 serial bus 12. That is, the source ID from the analysis unit 51 is used as the destination ID of the response transaction, and the data from the register 54 is arranged in the data part.
[0039]
If it is determined in step S4 that the address extracted in step S2 is not stored in the register 54, the process proceeds to step S9, where the control unit 52 controls the analysis unit 51 and receives the asynchronous packet received in step S1. Are transferred to ARF14. That is, in this case, the response transaction is not generated in the auto response unit 53. The asynchronous data processing unit 16 generates a response transaction corresponding to the asynchronous packet (request transaction) from the ARF 16 and outputs it to the IEEE1394 serial bus 10.
[0040]
As described above, the response transaction is generated based on the data from the register 54 in response to the request transaction that inquires the content whose answer has already been determined, such as the inquiry about the content of the configuration ROM. The burden on the CPU 17 can be reduced. This is particularly effective for AV equipment and the like that cannot allocate a large load to control the IEEE1394 interface.
[0041]
In the above, the contents of the configuration ROM are registered in the register 54, but other information such as a digital VCR TTC (Title Time Code) is responded at high speed (frequently). Necessary information can be registered in the register 54. This TTC may receive an inquiry every frame (for example, in a 1/30 sec cycle), and by performing the same process as described above, a response transaction can be efficiently generated and output. .
[0042]
In addition, as a providing medium for providing a user with a computer program for performing the processing as described above, a communication medium such as a network or a satellite can be used in addition to a recording medium such as a magnetic disk, a CD-ROM, or a solid-state memory. .
[0043]
【The invention's effect】
According to the information processing device according to claim 1, the information processing method according to claim 3, and the recording medium program according to claim 4, a request by asynchronous data when predetermined asynchronous data is received. Since data necessary for a response that must be returned within a predetermined time after receiving predetermined asynchronous data is stored in advance, response information can be generated efficiently.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration example of a transmission / reception device 41 to which the present invention is applied.
FIG. 2 is a block diagram illustrating a configuration example of a request transaction processing unit 32 in FIG.
FIG. 3 is a diagram illustrating an example of contents stored in a register 54;
FIG. 4 is a flowchart illustrating response transaction generation processing.
FIG. 5 is a block diagram illustrating a configuration example of a conventional receiving unit 22;
FIG. 6 is a diagram illustrating communication between a node A and a node B.
[Explanation of symbols]
10 serial bus, 11 input unit, 12 separator, 13 IRF, 14 ARF, 15 synchronous data processing unit, 16 asynchronous data processing unit, 17 CPU, 21 information processing device, 22 receiving unit, 31 separator, 32 request transaction processing Unit, 33 ROM, 41 transmission / reception device, 42 information processing device, 51 analysis unit, 52 control unit, 53 auto response unit, 54 register

Claims (4)

Information returned with another information processing apparatus, to transmit and receive synchronous data and asynchronous data over the bus, a response corresponding to the request by executing a predetermined process in response to a request from the other information processing apparatus In the processing device,
A response corresponding to a request by the asynchronous data when the predetermined asynchronous data is received, and predetermined information constituting a response that must be returned within a predetermined time after the reception of the predetermined asynchronous data. Holding means for holding;
Receiving means for receiving data transmitted via the bus;
If the data received by the receiving means is asynchronous data, a determination to determine whether or not the holding means holds information constituting a response corresponding to the request by the received asynchronous data Means,
When it is determined that the holding unit holds information constituting a response corresponding to the request by the asynchronous data received by the determination unit, response information is generated based on the information , and the information is sent to the bus. First output means for outputting;
When it is determined that the holding unit does not hold information constituting a response corresponding to the request by the asynchronous data received by the determining unit, the predetermined process is executed, and according to the processing result An information processing apparatus comprising: second output means for generating response information and outputting the response information to the bus . The holding unit holds information indicating the type of request based on the predetermined asynchronous data and information constituting a response corresponding to the request in association with each other,
The determination unit extracts information indicating a request type and information indicating a transmission source from the data received by the reception unit, and a holding unit holds information indicating the extracted request type. Whether or not
The first output means extracts the determination means when it is determined that the holding means holds information constituting a response corresponding to the request by the asynchronous data received by the determination means The information processing apparatus according to claim 1, wherein response information is generated from information representing a transmission source and information constituting a response corresponding to the request held by the holding unit and output to the bus. . Information returned with another information processing apparatus, to transmit and receive synchronous data and asynchronous data over the bus, a response corresponding to the request by executing a predetermined process in response to a request from the other information processing apparatus In the information processing method of the processing device,
A response corresponding to a request by the asynchronous data when the predetermined asynchronous data is received, and predetermined information constituting a response that must be returned within a predetermined time after the reception of the predetermined asynchronous data. Holding step to hold;
A receiving step of receiving data transmitted via the bus;
If the data received in the process of the reception step is asynchronous data, whether or not information constituting a response corresponding to the request by the received asynchronous data is held in the process of the holding step A determination step for determining
If it is determined that the information constituting the response corresponding to the request by the asynchronous data received in the determination step processing is held in the holding step processing, response information is generated based on the information. A first output step for outputting to the bus;
When it is determined that the holding step does not hold the information constituting the response corresponding to the request by the asynchronous data received in the determination step, the predetermined process is executed, and the processing result And a second output step of generating response information and outputting the response information to the bus . And an information processing apparatus, information processing to transmit and receive synchronous data and asynchronous data over the bus and returns a response corresponding to the request by executing a predetermined process in response to a request from the information processing device to the computer In the program to be executed,
A response corresponding to a request by the asynchronous data when the predetermined asynchronous data is received, and predetermined information constituting a response that must be returned within a predetermined time after the reception of the predetermined asynchronous data. Holding step to hold;
A receiving step of receiving data transmitted via the bus;
If the data received in the process of the reception step is asynchronous data, whether or not information constituting a response corresponding to the request by the received asynchronous data is held in the process of the holding step A determination step for determining
If it is determined that the information constituting the response corresponding to the request by the asynchronous data received in the determination step processing is held in the holding step processing, response information is generated based on the information. A first output step for outputting to the bus;
When it is determined that the holding step does not hold the information constituting the response corresponding to the request by the asynchronous data received in the determination step, the predetermined process is executed, and the processing result A recording medium for recording a computer-readable program for executing a process including a second output step for generating response information in response to the second output step and outputting the response information to the bus .

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