JPH11331213A - Information processing unit, its method and served medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate and output a response transaction efficiently. SOLUTION: A separator 31 separates a packet from an input section 11 into a synchronous packet and an asynchronous packet, outputs the synchronous packet to a synchronous receive FIFO 13 and outputs the asynchronous packet to a request transaction processing section 32. When a request transaction is a prescribed request transaction, the request transaction processing section 32 generates a response transaction and outputs it to a bus 10. When the request transaction is not a prescribed request transaction, the processing section 32 outputs the asynchronizing packet to an asynchronous receive FIFO 14. A CPU 17 of an information processing unit 42 controls a synchronous data processing section 15 and asynchronous data processing section 16 to allow them to execute various processing. A configuration ROM 33 connecting to the CPU 17 stores prescribed information relating to the information processing unit 42 in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an information processing apparatus and method, and a providing medium.
The present invention relates to an information processing apparatus and method, and a providing medium capable of efficiently executing a process specified in a transaction layer in a 94 standard protocol.

[0002]

2. Description of the Related Art Recently, computers and VCRs (Video Cassets) have been developed.
te Recorder) as an interface for communicating data and control signals
ー 1394Hight Performance Serial Bus (hereinafter IEEE1394)
An interface (hereinafter, referred to as IEEE1394 I / F) corresponding to a serial bus has attracted attention.

FIG. 5 shows a configuration example of a conventional receiving section 22 of an 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 packet of synchronous data for transmitting video data and audio data (hereinafter, referred to as a synchronous packet) and a packet of asynchronous data for transmitting a control signal (hereinafter, asynchronous). , And time-division multiplexed using 125 μsec as a reference cycle.

[0004] An input unit 11 is an IEEE1394 serial bus 10.
If the asynchronous packet (asynchronous packet) is a packet addressed to the information processing device 21 or the synchronous packet (isochronous packet) is a packet between the information processing device 21 and another device (not shown). If it has the channel number assigned to the communication between them, it outputs the received data to the separator 12.

[0005] The separator 12 judges 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. Then, the separator 12 transmits the synchronous packet to an IRF (Isochronous
IVE FIFO) 13 to output asynchronous packets to ARF (Async
hronous Receive FIFO) 14.

[0006] The IRF 13 stores the input synchronous packets so that they are read out by the synchronous data processing unit 15 in the input order. Synchronous data processing unit 15
Reads out synchronous packets from the IRF 13 in order,
Execute a predetermined process.

The ARF 14 stores the input asynchronous packets so that they are read out by the asynchronous data processing unit 16 in the order of input. Asynchronous data processing unit 16
Reads the asynchronous packets in order from the ARF 14,
Execute a predetermined process.

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

The information processing apparatus 21 configured as described above
IEEE 1394 by the receiving unit 22 as an interface of
Data can be received from the serial bus 10.

[0010]

By the way, the transaction layer constituting the protocol of the IEEE1394 standard is required only for asynchronous packets, and performs processing (request transaction) for requesting activation of a predetermined service and responds to the request. Processing (response transaction)
I do. For example, as shown in FIG.
When receiving the request transaction from the node B connected by the 1394 serial bus, the node A executes a process corresponding to the request transaction,
A response transaction is transmitted to the node B as a processing result. That is, in the information processing apparatus 21 of FIG. 5, the CPU 17 controls the asynchronous data processing unit 16 of the receiving unit 22 to execute a process corresponding to the request specified in the transaction layer.

According to the IEEE1394 standard, a node (information processing device) that has received a request transaction
Stipulates that a response transaction must be transmitted to a transmission source within a predetermined time (for example, within 100 ms).

For example, when the IEEE1394 serial bus 10 is reset, a configuration (not shown)
A request transaction for inquiring the contents of ROM is output. Upon receiving such a request transaction, the CPU 17 of the information processing apparatus 21 needs to execute other processing, and also execute processing for generating and outputting a response transaction. As a result, a large load is applied to the CPU 17, and at that time, the CPU 17
17 cannot execute quick processing.

[0013] The present invention has been made in view of such a situation, and for example, it is an object of the present invention to efficiently execute a process specified in a transaction layer.

[0014]

According to a first aspect of the present invention, there is provided an information processing apparatus comprising: receiving means for receiving a signal transmitted via a bus; and a signal indicating a transmission source based on the signal received by the receiving means. Extracting means for extracting the first information, the second information representing the type of request, holding means for holding the second information, and third information constituting a response corresponding thereto,
Determining means for determining whether or not the holding means holds the second information extracted by the extracting means; and the first information extracted by the extracting means based on the determination result by the determining means.
And response means for generating response information from the information and the third information held by the holding means, and outputting the response information to a bus.

[0015] In the information processing method according to the present invention, a receiving step of receiving a signal transmitted via a bus;
From the signal received in the receiving step, a first representing a source
And an extraction step of extracting second information representing the type of request, a second information and a holding step of storing third information constituting a response corresponding to the second information, and an extraction step. A determining step of determining whether or not the second information is stored in the storing step; and a third information stored in the storing step and the first information extracted in the extracting step based on a determination result in the determining step. An output step of generating response information from the above information and outputting the response information to a bus.

According to a third aspect of the present invention, there is provided a providing medium, comprising: a receiving step of receiving a signal transmitted via a bus; first information representing a transmission source from a signal received in the receiving step; An extraction step of extracting second information representing a type, a holding step of holding second information and third information constituting a response corresponding to the second information, and a second information extracted in the extraction step. A judging step of judging whether or not the data is held in the holding step;
And a computer-readable program for executing a process including an output step of generating response information from the information and the third information held in the holding step and outputting the response information to a bus.

An information processing apparatus according to claim 1 and claim 2.
In the information processing method described in the above, and the providing medium described in the claim 3, a signal transmitted via a bus is received, and from the received signal, first information indicating a transmission source and a request The second information representing the type is extracted, the second information and the third information constituting the corresponding response are held, and it is determined whether the extracted second information is held. Based on the determination result, response information is generated from the extracted first information and the retained third information, and is output to the bus.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below. In order to clarify the correspondence between each means of the invention described in the claims and the following embodiments, each means is described. When the features of the present invention are described by adding the corresponding embodiment (however, an example) in parentheses after the parentheses, the result is as follows. However, of course, this description does not mean that each means is limited to those described.

An information processing apparatus according to a first aspect of the present invention includes: a receiving unit (for example, the input unit 11 in FIG. 1) for receiving a signal transmitted via a bus; First information representing an element (for example, source I
D), an extracting unit (for example, the analysis unit 51 in FIG. 2) for extracting second information (for example, the address A in FIG. 3) indicating the type of the request, and a second information and a response corresponding thereto. Holding means (for example, the register 54 in FIG. 2) for holding the third information (for example, data a in FIG. 3), and whether the holding means holds the second information extracted by the extracting means. Determining means (for example, the control unit 52 in FIG. 2) for determining whether or not the first information extracted by the extracting means and the third information held by the holding means based on the determination result by the determining means Generate response information from
An output means for outputting to the bus (for example, the auto-response unit 53 in FIG. 2) is provided.

FIG. 1 shows a transmitting / receiving apparatus 41 to which the present invention is applied.
Is shown. Parts corresponding to those in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The information processing device 42 including a computer and a VCR has a transmission / reception device 41 as an interface with the IEEE1394 serial bus 10.

The input unit 11 of the transmitting / receiving device 41 is connected to the IEEE1394
It is connected to the serial bus 10 and receives data transmitted on the IEEE1394 serial bus 10. When an asynchronous packet among data received from the IEEE1394 serial bus 10 is a packet addressed to the information processing device 42, or a synchronous packet is allocated to communication between another information processing device (not shown) and the information processing device 42. When the input unit 11 has the assigned channel number, 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 a packet identification code written in the header of the packet, and separates the packet into a synchronous packet and an asynchronous packet. Then, 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 they are read out by the synchronous data processing unit 15 in the input order. Synchronous data processing unit 15
Reads out synchronous packets from the IRF 13 in order,
Execute a predetermined process.

Request transaction processing unit 32
Is the response transaction (response information) if the request transaction specified in the transaction layer is a predetermined request transaction
Is generated and output to the IEEE1394 serial bus 10. Request transaction processing unit 32
If the request transaction is not a predetermined request transaction, the ARF 14 outputs the asynchronous packet to the ARF 14.

The ARF 14 stores the input asynchronous packets so that they are read out by the asynchronous data processing unit 16 in the input order. The asynchronous data processing unit 16 reads an asynchronous packet from the ARF 14 and executes a predetermined process.

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 the information processing device 4
2 is stored 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 a 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. The analysis unit 51 is controlled by the control unit 52 and outputs the extracted source ID to the auto response unit 53,
The input asynchronous packet is transferred to the ARF 14. Note that 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 is provided with the information processing device 42 among the data (data a, b...) Necessary to be sent (answered) as a response transaction corresponding to the request transaction. At this point, the already determined one has been registered together with the corresponding address (addresses A, B,...). The register 54 is also controlled by the control unit 52, and outputs a stored address to the control unit 52, and outputs stored data 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 generates a response transaction packet. Output.

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 The response section 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 this example, a request transaction for inquiring about the contents of the configuration ROM of the information processing device 42 from the information processing device (transmission source) (not shown) connected to the IEEE1394 serial bus 12 together with the information processing device 42. Assume that it has been transmitted. That is, the request transaction includes an address stored in the register 54 as information indicating the type of inquiry.

In step S1, the analysis unit 51 of the request transaction processing unit 32
Receiving the supply of the asynchronous packet from the
In the supplied asynchronous packet, the source ID
Then, the address specified in the transaction layer is extracted.

Next, in step S3, the analysis unit 51
Outputs the address extracted in step S2 to the control unit 52. In step S4, 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, where the control unit 52 causes the auto response unit 53 to generate a response transaction. Command. Thereby, the auto response unit 53
Data from register 54 and source ID from analysis unit 51
, A response transaction can be generated.

Next, in step S6, the control unit 52
Controls the register 54 to output the data corresponding to the address extracted in step 2 to the auto-response unit 53, controls the analysis unit 51 in step S7, and stores the source ID extracted in step S2 It 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 it 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,
The data from the register 54 is arranged in the data portion.

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
The controller 51 controls the analyzer 51 to transfer the asynchronous packet received in step S1 to the ARF 14. That is, in this case, no response transaction is generated in the auto response unit 53. Asynchronous data processing unit 1
6 generates a response transaction corresponding to an asynchronous packet (request transaction) from the ARF 16 and outputs it to the IEEE1394 serial bus 10.

As described above, in response to a request transaction for inquiring the contents for which the answer has already been determined, such as an inquiry for the contents of the configuration ROM,
Since the response transaction is generated based on the data from the register 54, the information processing device 4
Second, the load on the CPU 17 can be reduced. In particular, IEE
This is effective for AV equipment or the like in which a large load cannot be assigned to the control of the E1394 interface.

In the above description, the contents of the configuration ROM are registered in the register 54. However, other information, for example, the TTC (Title T
For example, information that needs to respond quickly (frequently) such as imeCode) can be registered in the register 54. This TTC is transmitted every frame (for example, 1
In some cases, an inquiry may be received (in a cycle of / 30 sec), and by performing the same processing as described above, a response transaction can be efficiently generated and output.

[0042] Examples of a providing medium for providing a user with a computer program for performing the above processing include:
In addition to recording media such as magnetic disks, CD-ROMs, and solid-state memories, communication media such as networks and satellites can be used.

[0043]

According to the information processing apparatus according to the first aspect, the information processing method according to the second aspect, and the providing medium according to the third aspect, data necessary for a response is held in advance. Therefore, response information can be efficiently generated.

[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 has been applied.

2 is a request transaction processing unit 32 shown in FIG.
FIG. 2 is a block diagram illustrating a configuration example.

FIG. 3 is a diagram illustrating an example of contents stored in a register 54;

FIG. 4 is a flowchart illustrating a response transaction generation process.

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,
DESCRIPTION OF SYMBOLS 21 Information processing apparatus, 22 Receiving part, 31 Separator, 32 Request transaction processing part, 3
3 ROM, 41 transmitting / receiving device, 42 information processing device, 51 analysis unit, 52 control unit, 53 auto response unit, 54 register

Claims (3)

[Claims] 1. An information processing device connected to another information processing device via a bus and returning a response corresponding to a request from the other information processing device, wherein the information is transmitted via the bus. Receiving means for receiving an incoming signal; first information representing a transmission source and second information representing a type of request from the signal received by the receiving means; and second information. And holding means for holding third information constituting a response corresponding thereto, and determining means for determining whether or not the holding means holds the second information extracted by the extracting means. Generating response information from the first information extracted by the extracting means and the third information held by the holding means, based on a determination result by the determining means; The information processing apparatus according to an outputting means for outputting. 2. An information processing method for an information processing apparatus connected to another information processing apparatus via a bus and returning a response corresponding to a request from the other information processing apparatus, the information processing apparatus comprising: A receiving step of receiving a signal transmitted in the receiving step; an extracting step of extracting first information representing a transmission source and second information representing a type of a request from the signal received in the receiving step; A holding step of holding second information and third information constituting a response corresponding to the second information; and determining whether or not the second information extracted in the extracting step is held in the holding step. Determining the first information extracted in the extracting step and the third information held in the holding step based on a result of the determination in the determining step; It generates Pons information, the information processing method characterized by comprising an output step for outputting to said bus. 3. An information processing method of an information processing apparatus connected to another information processing apparatus via a bus and returning a response corresponding to a request from the other information processing apparatus via the bus. A receiving step of receiving a signal transmitted in the receiving step; an extracting step of extracting first information representing a transmission source and second information representing a type of a request from the signal received in the receiving step; A holding step of holding second information and third information constituting a response corresponding to the second information; and determining whether or not the second information extracted in the extracting step is held in the holding step. A determining step, based on a result of the determination in the determining step, a response from the first information extracted in the extracting step and the third information held in the holding step; Providing medium for generating information, computer to execute processing including an output step for outputting to the bus and providing a readable program.