JP4211859B2 - Information processing apparatus and method, and recording medium - Google Patents

Description

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.

  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.

  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.

  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.

  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.

  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.

  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.

  The CPU 17 controls the synchronous data processing unit 15 and the asynchronous data processing unit 16 to execute various processes.

  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.

  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.

  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).

  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 apparatus 21 receives such a request transaction, it needs to execute other processes 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.

  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.

An information processing apparatus according to an aspect of the present invention is an information processing apparatus that is connected to another information processing apparatus via a bus and outputs a response transaction for a request transaction specified in a transaction layer from the other information processing apparatus. Receiving means for receiving a request transaction transmitted via the bus; extracting means for extracting first information representing a request type from the request transaction received by the receiving means; and the first Corresponding to the first information indicating the type of the predetermined request among the information, the first information indicating the type of the predetermined request and the second information for configuring a response transaction for the predetermined request holding means for holding in association, upon receiving the request transaction, the Li The first information extracted by the extraction unit from Est transaction, the determines whether held by the holding means, when said holding means is determined to be held, the appropriate first information Output means for generating a response transaction based on the second information corresponding to the output information and outputting it to the bus, and when determining that the holding means does not hold, according to the request transaction specified in the transaction layer Processing means for executing predetermined processing, and the output means outputs a response transaction generated according to a result of the processing executed by the processing means to the bus .

The information processing apparatus may further include means for changing the first information held by the holding means and the second information for configuring a response transaction for the request.

The bus is the IEEE1394 bus, the predetermined request can be to be the setting information stored the information processing apparatus in the memory means in the information processing apparatus.

An information processing method according to an aspect of the present invention is an information processing apparatus that is connected to another information processing apparatus via a bus and outputs a response transaction for a request transaction specified in a transaction layer from the other information processing apparatus. In the information processing method, a reception step of receiving a request transaction transmitted via the bus, and an extraction step of extracting first information representing a request type from the request transaction received in the processing of the reception step If, with respect to the first information indicating the type of predetermined request of the first information, the first information indicating the type of the predetermined request, first to configure the response transaction to said predetermined request a holding step of holding in association with the second information, the request tiger When receiving-transactions, the first information extracted by the processing of the extracting step from the request transaction, determines whether it is held in the process of the holding step, held in the processing of said holding step If it is determined that it has been held, the response step generates a response transaction based on the second information corresponding to the corresponding first information and outputs it to the bus, and it is not held in the holding step A process step that executes a predetermined process corresponding to the request transaction specified in the transaction layer, and in the process of the output step, according to a result of the process executed by the process step The generated response transaction is output to the bus .

A recording medium according to one aspect of the present invention is a processing program that is connected to an information processing apparatus via a bus and outputs a response transaction to a request transaction specified in a transaction layer from the information processing apparatus, A receiving step for receiving a request transaction transmitted via a bus; an extracting step for extracting first information representing a request type from the request transaction received in the processing of the receiving step; Corresponding to the first information indicating the type of the predetermined request among the information, the first information indicating the type of the predetermined request and the second information for configuring a response transaction for the predetermined request a holding step of holding in association, receives the request transaction When the first information extracted by the processing of the extracting step from the request transaction, determines whether it is held in the process of the holding step, when held in the processing of said holding step If it is determined, if it is determined not to be held in the output step of generating a response transaction based on the second information corresponding to the corresponding first information and outputting it to the bus, and the holding step, A process step of executing a predetermined process corresponding to the request transaction specified in the transaction layer, and in the process of the output step, a response generated according to a result of the process executed by the process step computer readable program that outputs a transaction to the bus It is recorded.

In the information processing apparatus, the information processing method, or the recording medium according to one aspect of the present invention, the request transaction transmitted via the bus is received, and the first information indicating the type of request is received from the received request transaction. There is extracted, with respect to the first information indicating the type of a given request of the first information, the first information indicating the type of the predetermined request, first to configure the response transaction to said predetermined request When the information of 2 is held in association with each other and a request transaction is received, it is determined whether or not the first information extracted from the request transaction is held. the response transaction based on the second information corresponding to the first information is output to the generated bus corresponding coercive If it is determined that to not a predetermined process corresponding to the request transaction specified in the transaction layer are performed, the response transaction generated according to the result of the executed processing is output to the bus.

  According to one aspect of the present invention, since data necessary for a response is stored in advance, response information can be generated efficiently.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  Next, a processing procedure for generating a response transaction will be described with reference to the flowchart of FIG.

  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.

  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.

  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.

  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.

  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.

  In step S 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.

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. Is 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 14 and outputs it to the IEEE1394 serial bus 10.

  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.

  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. .

  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 memory. .

It is a block diagram showing the example of a structure of the transmission / reception apparatus 41 to which this invention is applied. FIG. 2 is a block diagram illustrating a configuration example of a request transaction processing unit 32 in FIG. 1. 4 is a diagram illustrating an example of stored contents of a register 54. FIG. It is a flowchart explaining a response transaction generation process. It is a block diagram showing the example of a structure of the conventional receiving part 22. FIG. It is a figure explaining the communication between the node A and the node B. FIG.

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 (5)

In an information processing apparatus that is connected to another information processing apparatus via a bus and outputs a response transaction for a request transaction specified in a transaction layer from the other information processing apparatus,
Receiving means for receiving a request transaction transmitted via the bus;
Extraction means for extracting first information representing the type of request from the request transaction received by the receiving means;
With respect to the first information indicating the type of predetermined request of the first information, the first information indicating the type of the predetermined request, second to configure the response transaction to said predetermined request Holding means for associating and holding information;
When the request transaction is received, it is determined whether or not the first information extracted from the request transaction by the extraction unit is held in the holding unit, and the holding unit holds If it is determined, output means for generating a response transaction based on the second information corresponding to the corresponding first information and outputting the response transaction to the bus ;
A processing unit that executes a predetermined process corresponding to the request transaction specified in the transaction layer when it is determined that the holding unit does not hold the transaction;
With
The information processing apparatus , wherein the output means outputs a response transaction generated according to a result of the processing executed by the processing means to the bus . The information processing apparatus according to claim 1, further comprising: means for changing the first information held by the holding means and second information for configuring a response transaction for the request. The information processing apparatus according to claim 1, wherein the bus is an IEEE1394 bus, and the predetermined request is setting information of the information processing apparatus stored in a storage unit in the information processing apparatus. In an information processing method of an information processing apparatus that is connected to another information processing apparatus via a bus and outputs a response transaction for a request transaction specified in a transaction layer from the other information processing apparatus,
A receiving step for receiving a request transaction transmitted via the bus;
An extraction step of extracting first information representing the type of request from the request transaction received in the processing of the reception step;
With respect to the first information indicating the type of predetermined request of the first information, the first information indicating the type of the predetermined request, second to configure the response transaction to said predetermined request A holding step for associating and holding information;
When the request transaction is received, it is determined whether or not the first information extracted from the request transaction by the extraction step processing is held by the holding step processing, and the holding step processing Output step of generating a response transaction based on the second information corresponding to the corresponding first information and outputting the response transaction to the bus ,
A process step of executing a predetermined process corresponding to the request transaction specified in the transaction layer when it is determined that the process is not held in the process of the holding step;
Including
In the process of the output step, an information processing method for outputting a response transaction generated according to a result of the process executed in the process step to the bus . A processing program that is connected to an information processing apparatus via a bus and outputs a response transaction for a request transaction specified in a transaction layer from the information processing apparatus,
A receiving step for receiving a request transaction transmitted via the bus;
An extraction step of extracting first information representing the type of request from the request transaction received in the processing of the reception step;
With respect to the first information indicating the type of predetermined request of the first information, the first information indicating the type of the predetermined request, second to configure the response transaction to said predetermined request A holding step for associating and holding information;
When the request transaction is received, it is determined whether or not the first information extracted from the request transaction by the extraction step processing is held by the holding step processing, and the holding step processing Output step of generating a response transaction based on the second information corresponding to the corresponding first information and outputting the response transaction to the bus ,
A process step of executing a predetermined process corresponding to the request transaction specified in the transaction layer when it is determined that the process is not held in the process of the holding step;
Including
In the process of the output step, a recording medium on which a computer-readable program that outputs a response transaction generated according to the result of the process executed in the process step to the bus is recorded.

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