JP6161113B2 - Data relay device and data relay system - Google Patents

Description

  The present invention relates to information transmission / reception technology between devices connected by a plurality of buses, and in particular, a data relay device, a data relay system, a data relay method, and a data relay method for performing data relay processing in response to a request from a higher-level device. Regarding the program.

  In recent years, with the advancement of electronic and electrical equipment, the amount of information handled by computers has increased, and along with this, the need to improve the processing speed of a central processing unit (CPU) included in computers has increased.

  For this reason, the processing speed has been improved by increasing the clock frequency of the CPU. However, such a method alone is not sufficient for the increasing amount of information, and measures such as reviewing the transfer protocol are also required.

  In addition, by making a group of instructions processed in stages in the CPU independent in each processing stage, a plurality of consecutive groups of instructions are processed in a flow and work in independent processing stages. High speed technology (pipeline processing) is also known.

  In addition, when developing products, not only those that are newly designed, but only some of the parts and programs that have a specific function are newly designed, and other parts and programs that have been developed so far There are increasing cases of using design assets.

  Under such circumstances, in the data relay system 600 in the related technology as shown in FIG. 15, the data relay device (user circuit) 100 connected to the primary bus 410 and the secondary bus 420 is connected to the primary bus 410. A host device (master) 200 having a bus master function and a lower device (target) 300 that is connected to the secondary bus 420 and has a function of reading (reading) or writing (writing) data. It is configured to execute the reading process.

That is, as shown in FIG. 16, when a read request (read request) 710 (1) is asserted (validly transmitted) from the host device 200 via the primary bus 410, the data relay device 100 An acknowledgment (acknowledge) 730 (1) is returned to the request, request information is acquired thereafter, and a read request 720 (1) is issued to the lower level device 300 on the secondary bus 420 side.
Next, the data relay apparatus 100 that has received the read data 810 (1) from the lower-level device 300 on the secondary bus 420 side allows the host device 200 on the primary bus 410 side to read-enable (to enable reading). Signal) is transmitted (asserted) and read data 810 (1) is transmitted.

  Further, after returning the confirmation response 730 (1), as shown in FIG. 16, a read request (subsequent read request) 710 (2) transmitted from the primary bus 410 side following the read request 710 (1) is received. At this time, the data relay device 100 does not immediately return a confirmation response 730 (2) to the higher-level device 200, but sends the read data 810 (1) to the primary bus 410 side. It is configured to return this after returning it.

Thereafter, as described above, the data relay device 100 that has received the read data 810 (2) from the lower-level device 300 by issuing the subsequent read request 720 (2) to the secondary bus 420 side, The read data 810 (2) is transmitted to the device 200.
Here, only the transmission / reception of information related to the read request 710 (1) and the subsequent read request 710 (2) is shown, but in actuality, it is continuously transmitted from the host device 200 on the primary bus 410 side. A configuration is adopted in which the data relay device 100 sequentially acquires read requests.

  In such a data relay system, as a specification of the primary bus, there are the following two restrictions between an acknowledgment (acknowledge) and a write enable or a read enable.

The first restriction is that when there is a preceding request, the timing at which an acknowledge signal for a subsequent read request can be returned must be after the write enable or read enable of the final data of the preceding request.
The second restriction is that the transmission of the write enable or read enable for the request must be after the return of the acknowledge signal for the request.

  In addition, when there are consecutive requests from the primary bus side, if an acknowledgment of the preceding request is returned, the subsequent request is issued even if the write enable or read enable of the preceding request is not transmitted. It is configured as follows.

  Further, as a technique related to processing by the CPU, for example, the following contents (Patent Document 1 or 2) are known.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses a technical content that, in a plurality of memory access control devices sharing a storage device, execution results for mixed memory access requests are returned in order of request. Here, a multiprocessor control method is disclosed in which the hardware configuration related to the order control of issued requests is reduced.

  Japanese Patent Laid-Open No. 2004-228561 discloses a configuration relating to two bus bridges in which two CPUs are connected via an upper bus and two external agents are connected via a lower bus. Here, the bus acquisition request signal is output to the upper bus before confirming the read ID by referring to the information on whether or not one or more read IDs of the read request newly issued to the lower bus are held. The technical content to be disclosed is disclosed.

Japanese Patent Laid-Open No. 61-045355 Japanese Patent Laid-Open No. 10-187595

However, when the data relay apparatus 100 according to the related technology described with reference to FIGS. 15 and 16 receives the read request 710 (1) from the primary bus 410 side, it first returns a confirmation response 730 (1). Then, after acquiring the request information, a read request 720 (1) is transmitted to the secondary bus 420, and read data 810 (1) returned in response to the request is acquired and also to the primary bus 410. And returned it.
Here, according to the standard of the primary bus 410, the reply of the confirmation response according to the subsequent request when the request is continuous can be performed only after the timing when the return of the read data related to the preceding request is completed. Since it is necessary to repeat the above-described series of processes for each request, there is an inconvenience that a processing time corresponding to the number of requests is required before the processing of all consecutive requests is completed.

  Japanese Patent Laid-Open No. 2004-228688 has technical contents for reducing the amount of hardware while guaranteeing the order of requests, and does not disclose any technical contents for efficiently using a bus. In addition, Patent Document 2 discloses a technique for a CPU as a plurality of bus masters to efficiently use a bus, and the bus is efficiently used when the same master reads (reads) continuously. There is no disclosure of the technical content of use.

(Object of invention)
The present invention improves the inconvenience of the related technology, and in particular, by effectively relaying information related to requests (requests) continuously transmitted from a host device, data processing based on the requests can be performed. It is an object of the present invention to provide a data relay device, a data relay system, a data relay method, and a program thereof that are speeded up.

In order to achieve the above object, in the first data relay device according to the present invention, a signal related to a request transmitted from a higher-level device connected to the primary bus is transmitted to a lower-level device connected to the secondary bus. And a data relay apparatus that performs data relay processing in response to the request, an acknowledgment reply unit that returns an acknowledgment to the request to the upper apparatus, and a read request as the request received from the upper apparatus. And a read request transmission / reception processing unit that transmits a signal based on the read request information to the lower-level device, and the read request transmission / reception unit receives the read request when the read request is received. an acknowledgment to perform the acquisition and transmission independent of the said acknowledgment response unit returns the request is a signal that is continuously transmitted from the host device, The read / write request transmission / reception processing unit, when the confirmation response reply unit returns a confirmation response to the read request and receives a subsequent read request from the higher-level device, the subsequent read corresponding to the subsequent read request Further comprising a subsequent information acquisition means for acquiring request information, further comprising a read data transfer unit for transferring read data transmitted from the lower apparatus to the upper apparatus in response to a signal based on the read request information, When the read data transfer unit finishes receiving the read data, the request transmission / reception processing unit transmits a signal based on the subsequent read request information to the lower-level device, and the read data transfer unit transmits the subsequent read The read data related to the request is stored, and when the processing of the read data related to the preceding read request is completed, It adopts a feature and the called configuration to have a data sequence control unit to be transmitted to the host system the read data. Further, in the second data relay device according to the present invention, a signal related to a request transmitted from the higher-level device connected to the primary bus is transmitted to the lower-level device connected to the secondary bus, and in response to the request. A data relay apparatus that performs data relay processing, a confirmation response reply unit that returns a confirmation response to the request to the host apparatus, and read request information corresponding to the read request as the request received from the host apparatus. A read request transmission / reception processing unit that obtains and transmits a signal based thereon to the lower-level device, and the read request transmission / reception unit receives a confirmation response to the confirmation response when the read request is received. Regardless of the response from the reply unit, the acquisition and transmission are executed, and the request is a signal continuously transmitted from the host device, and the read request transmission / reception is performed. The processing unit obtains subsequent read request information corresponding to the subsequent read request when the confirmation response reply unit returns a confirmation response to the read request and receives a subsequent read request from the higher-level device. And when the secondary bus is composed of a plurality of secondary buses and the subordinate device is composed of a plurality of subordinate devices associated with each of the plurality of secondary buses, After the confirmation response reply unit returns a confirmation response to the write request as the request received from the host device, the write data corresponding to the write request is acquired from the host device and is in a standby state. A write data transfer unit for transferring to a lower-level device, wherein the read request transmission / reception processing unit sends a confirmation response to the write request to the confirmation response return unit; Regardless of the data transfer processing by the write data transfer unit, when a reply and subsequent read request is received from the host device, a signal based on the subsequent read request information acquired by the subsequent information acquisition unit is transmitted. When the write request is transmitted to another lower-level device that is in a standby state, a write response corresponding to the write request is made regardless of whether the confirmation response reply unit returns a confirmation response to the write request. A write request information acquisition processing unit that acquires and stores request information, and a signal based on the write request information stored by the write request information acquisition processing unit when the write data transfer unit acquires the write data. A write request transmission processing unit that transmits to the lower-level device in the standby state, and the write request transmission processing unit is in the standby state. It has a configuration characterized by having a bus selection means for selecting a position device according to a preset standard.

  In the data relay system according to the present invention, the host device connected to the primary bus, the subordinate device connected to the secondary bus, and the request signal transmitted from the host device are transmitted to the subordinate device. And a data relay device that performs data relay processing in response to the request.

  Furthermore, in the data relay method according to the present invention, a signal related to a request transmitted from a higher-level device connected to the primary bus is transmitted to a lower-level device connected to the secondary bus, and data relay according to the request is performed. In the data relay device that performs processing, receives the read request as the request from the higher-level device, acquires read request information according to the read request and transmits a signal based on the read request information to the lower-level device, An acknowledgment response to the request is returned to the host device.

  In the data relay program according to the present invention, a signal related to a request transmitted from a higher-level device connected to the primary bus is transmitted to a lower-level device connected to the secondary bus, and the data relay corresponding to the request is performed. In the data relay apparatus that performs processing, an acknowledgment reply means for returning an acknowledgment to the request to the upper apparatus, and when receiving a read request as the request from the upper apparatus, confirming the acknowledgment to the confirmation Regardless of replying by the response reply means, the read request transmission / reception processing means for acquiring the read request information corresponding to the read request and transmitting a signal based on the read request information to the subordinate apparatus in advance to the data relay apparatus. A data relay program for causing a provided computer to function.

  According to the present invention, in particular, a data relay device that can speed up data processing based on a request by effectively relaying information on a request (request) continuously transmitted from a host device, A data relay system, a data relay method, and a program thereof can be provided.

It is a block diagram which shows the structure of the data relay apparatus and data relay system concerning 1st Embodiment of this invention. It is the schematic which shows the information transmitted / received by the primary bus in the data relay system disclosed in FIG. 1, and a secondary bus. It is the schematic which shows the continuous read process by the data relay apparatus and data relay system which were disclosed in FIG. It is a sequence diagram which shows operation | movement of the data relay apparatus and data relay system which were disclosed by FIG. It is a block diagram which shows the structure of the data relay apparatus and data relay system concerning 2nd Embodiment of this invention. FIG. 6 is a schematic diagram illustrating continuous read processing by the data relay device and the data relay system disclosed in FIG. 5. FIG. 6 is a sequence diagram illustrating operations of the data relay device and the data relay system disclosed in FIG. 5. It is a block diagram which shows the structure of the data relay apparatus and data relay system concerning 3rd Embodiment of this invention. It is the schematic which shows the information transmitted / received by the primary bus and secondary bus in the data relay system disclosed in FIG. FIG. 9 is a schematic diagram illustrating continuous read processing by the data relay device and the data relay system disclosed in FIG. 8. FIG. 9 is a sequence diagram illustrating operations of the data relay device and the data relay system disclosed in FIG. 8. It is a block diagram which shows the structure of the data relay apparatus and data relay system concerning 4th Embodiment of this invention. It is the schematic which shows the continuous read process by the data relay apparatus and data relay system which were disclosed in FIG. FIG. 13 is a sequence diagram illustrating operations of the data relay device and the data relay system disclosed in FIG. 12. It is a block diagram which shows the structure of the data relay apparatus concerning related technology, and a data relay system. FIG. 16 is a schematic diagram showing continuous read processing by the data relay system disclosed in FIG. 15.

[First Embodiment]
A data relay device and a data relay system according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the data relay system 61 is connected to a primary bus 41 and a secondary bus 42 compliant with a bus standard such as PCI (Peripheral Components Interconnect), and to the primary bus 41 and the secondary bus 42. Data relay device (user circuit) 11, a higher-level device (master) 20 that is connected to the primary bus 41 and has a bus master function for issuing a write request (write command) or a read request (read command), and a secondary And a lower level device (target) 31 that is a device connected to the bus and having a function of reading or writing data.

Since the master 20 has a function of issuing a request (request) by pipeline processing, when issuing a request continuously (requesting), data (write data or read data) on the primary bus 41 ), The request information to be processed next can be seen.
The requests (write request and read request) are signals that are continuously transmitted from the host device 20 to the data relay device 11.
Here, the primary bus 41 and the secondary bus 42 may be configured to conform to the same bus standard, or may be configured to conform to different bus standards.

  The data relay device 11 transmits a signal related to a request continuously transmitted from the higher-level device 20 connected to the primary bus 41 to the lower-level device 31 connected to the secondary bus 42 and responds to the request. It is configured to perform data relay processing.

  More specifically, the data relay device 11 receives a confirmation response reply unit 50 that sends back a confirmation response to the request from the host device 20, and receives a confirmation response when receiving a read request from the host device 20. A read request for acquiring read request information (read request information) corresponding to the read request and transmitting a signal based on the read request information to the lower-level device 31 regardless of the reply of 50 (without waiting for the reply) A transmission / reception processing unit 51 and a read data transfer unit 55 that transfers read data transmitted from the lower apparatus 31 to the upper apparatus 20 in response to a signal based on the read request information.

  The read request transmission / reception processing unit 51 receives the confirmation response to the read request, and the read data transfer unit 55 performs the read data when the confirmation response reply unit 50 replies and receives a subsequent read request from the higher-level device 20. The subsequent information acquisition means 51A for acquiring the subsequent read request information corresponding to the subsequent read request, regardless of the progress status of the processing relating to the above (regardless of the processing by the read data transfer unit 55), and the subsequent information acquisition Request information storage processing means 51B for storing and processing subsequent read request information acquired by means 51A in an internal memory or the like (not shown).

In addition, the read request transmission / reception processing unit 51 outputs a signal based on the subsequent read request information stored in the request information storage processing unit 51B when the read data transfer unit 55 has finished receiving the read data. Configured to send to.
Further, the read data transfer unit 55 is configured to transmit the read data to the host device 20 when reception of the read data is completed.

  Next, referring to FIG. 2, signals transmitted and received on the primary bus 41 that connects the higher-level device 20 and the data relay device 11 and the secondary bus 42 that connects the data relay device 11 and the lower-level device 31. The structure concerning will be described.

  First, in the primary bus 41 interposed between the host device 20 and the data relay device 11, a request 71 that is a signal that the host device 20 continuously transmits to the data relay device 11 and the data relay. The confirmation response 73, which is a signal that the device 11 has effectively received (asserted) the request from the upper device 20, and the read data 81 acquired from the lower device 31 via the secondary bus are sent to the upper device 20. On the other hand, when the data relay apparatus 11 is ready to receive the read enable (signal for enabling reading) 74 and the write data 91 transmitted via the primary bus, the host apparatus 20 A write enable (signal for enabling writing) 75 to transmit (assert) is transmitted and received.

The request 71 includes a request signal, an address, a write / read selection signal, and data size information such as the number of bursts and data width.
Further, in the first embodiment, the data relay apparatus 11 performs the reply of the confirmation response 73 to the write request or the read request as the request 71 after receiving the request information (request information) corresponding to the request 71. Adopted. In other words, the data relay apparatus 11 acquires the write request information or the read request information and sends it to the internal memory as necessary regardless of the reply of the confirmation response 73 (without waiting for the reply of the confirmation response 73). Etc. (not shown).

  Further, as the specification of the primary bus 41, the first restriction described above (when there is a preceding request, there is a timing at which the confirmation response to the subsequent read request can be returned between the confirmation response and the write enable or read enable. , Must be after write enable or read enable for the last data of the preceding request) and second constraint (assertion of write enable or read enable for the request must be after reply of acknowledgment for the request) ) Exists.

  Next, in the secondary bus 42 interposed between the data relay device 11 and the lower device 31, a read request that is a signal based on request information corresponding to the request (read request or write request) 71 received from the higher device 20. 72 or the write request 76, read data 81 transmitted from the lower apparatus 31 in response to the read request 72, and write data 91 transmitted from the data relay apparatus 11 to the lower apparatus 31 after the write request 76 are transmitted and received. It is configured as follows.

  Next, referring to FIG. 3, when the number of standings of the lower level device 31 on the secondary bus 42 side is 1 (the number of requests that can be processed at one time), the data relay device 11 performs a continuous read process (read). Process). In FIG. 3, time (t) is plotted on the horizontal axis, and changes in signals and data transmitted and received in the primary bus 41 and the secondary bus 42 are shown.

When the read request 71 (1) is effectively transmitted (asserted) from the primary bus 41 side, the read request transmission / reception processing unit 51 returns (asserts) the confirmation response 73 (1) by the confirmation response reply unit 50. The read request information is acquired without waiting.
Further, the read request transmission / reception processing unit 51 issues a read request 72 (1) to the secondary bus 42 side regardless of the status of the reply of the confirmation response 73 (1).

  If the subsequent read request 71 (2) is issued from the primary bus 41 side after the confirmation response reply unit 50 returns the confirmation response 73 (1), the read request transmission / reception processing unit 51 includes the subsequent information acquisition unit 51A. The subsequent request information related to the subsequent read request 71 (2) is acquired and stored in an internal memory or the like (not shown) by the request information storage processing means 51B.

  At the time when the read request transmission / reception processing unit 51 acquires the subsequent request information, the read data transfer unit 55 has not returned the read data 81 (1) to the host device 20. Therefore, the confirmation response reply unit 50 is configured not to reply the confirmation response 73 (2) at this time due to the second restriction.

  When the read data 81 (1) is received from the lower level device 31 on the secondary bus 42 side, the data relay device 11 sends a subsequent read request 72 (2) to the secondary bus 42 side in the read request transmission / reception processing unit 51. The read data transfer unit 55 is configured to return read data 81 (1) to the host device 20 on the primary bus 41 side.

  In other words, the read data transfer unit 55 that has received the read data 81 (1) on the secondary bus 42 side transmits (asserts) a read enable to the primary bus 41 side and also reads the read data 81 ( 1) is sent back.

  When the return of the read data 81 (1) by the read data transfer unit 55 is completed, the confirmation response reply unit 50 is configured to return a confirmation response 73 (2) to the higher-level device 20 (the second response). Constraints).

  The data relay processing related to the subsequent read request 71 (2) is the same as the processing content related to the read request 71 (1) described above. That is, the read data transfer unit 55 that has received the read data 81 (2) corresponding to the subsequent read request 72 (2) on the secondary bus 42 side transfers the read data 81 (2) to the primary bus 41 side. .

  In FIG. 3, a part of the signal transmitted and received in the related technique shown in FIG. 16 is indicated by a broken line, whereby the data relay system 61 according to the first embodiment and the data relay according to the related technique are described. The system 600 shows a significant difference in information transmission / reception processing when similar processing is started simultaneously.

  That is, according to the “difference in processing completion time” in FIG. 3, the time (processing completion time) until the read data 81 (2) related to the subsequent read request 71 (2) is returned is read data 810 (2 ) Clearly indicate that it is much earlier than the time it takes to return (process completion time).

  In addition, the data relay apparatus 11 in the first embodiment also executes the same processing as the subsequent read request 71 (2) for the data relay processing related to the continuous subsequent read requests (not shown). Is configured to do. Therefore, according to the data relay device 11 that realizes significant data relay processing in response to a request continuously transmitted from the host device 20, it is possible to speed up data processing based on the request.

(Description of operation)
Next, operations of the data relay apparatus 11 and the data relay system 61 shown in FIG. 1 will be described based on the sequence diagram shown in FIG.

The read request transmission / reception processing unit 51 that has received the read request from the upper apparatus 20 acquires read request information corresponding to the read request (FIG. 4: S101), and sends a signal based on the read request information to the lower apparatus 31. (FIG. 4: S102).
Next, the confirmation response reply unit 50 returns a confirmation response to the request to the higher-level device 20 (FIG. 4: S103).

  Next, the read request transmission / reception processing unit 51 that has received the subsequent read request from the higher-level device 20 acquires the subsequent read request information corresponding to the request by the subsequent information acquisition unit 51A, and appropriately stores this request information storage processing unit. In 51B, storage processing is performed in an internal memory or the like (not shown) (FIG. 4: S104).

Subsequently, the read data transfer unit 55 receives the read data transmitted from the lower device 31 in response to the signal based on the read request information (FIG. 4: S105).
When this reception is completed, the read request transmission / reception processing unit 51 transmits a signal based on the subsequent read request information to the lower-level device 31 (FIG. 4: S106). A read enable is transmitted (FIG. 4: S107), and the read data received as described above is transmitted (FIG. 4: S108).
Next, the confirmation response reply unit 50 returns a confirmation response to the subsequent reading request (subsequent confirmation response) to the higher-level device 20 (FIG. 4: S109).

  Next, the read data transfer unit 55 that has received the subsequent read data transmitted from the lower apparatus 31 according to the signal based on the subsequent read request information (FIG. 4: S110) transmits a read enable to the upper apparatus 20. (FIG. 4: S111) The subsequent read data is returned (FIG. 4: S112).

  The execution contents of each step in the above steps S101 to S112 (FIG. 4) may be programmed, and the series of each control program may be realized by a computer. Moreover, although the said operation | movement content was demonstrated in order of the number attached | subjected in FIG. 4 (S101-S112) for convenience, the operation | movement order concerning this 1st Embodiment is not necessarily limited to this.

(Effects of the first embodiment)
When a read request is transmitted from the primary bus 41 side where the pipeline processing is performed to the secondary bus 42 side, the data relay device 11 effectively relays the information related to the read request. Processing time required for processing can be shortened.

  That is, when the read requests from the primary bus 41 are continuous, the data relay device 11 acquires request information and makes a read request to the secondary bus 42 without relying on the reply of the confirmation response. Therefore, it is possible to speed up data processing for each successive request.

In addition, as described above, according to the data relay device 11, even when read requests continue from the primary bus that has a restriction on the response timing of the confirmation response, the processing speed until the read processing is completed can be increased. It is possible to improve throughput for read requests executed on the same bus.
Furthermore, if the protocol handled in the past is a case that conforms to the first embodiment, the performance of the existing system or the like can be improved.

[Second Embodiment]
A second embodiment of the data relay apparatus and data relay system according to the present invention will be described with reference to FIGS. Here, the same reference numerals are used for the same constituent members as those of the first embodiment described above.

(Overall configuration)
In the second embodiment, as the lower level device (target) on the secondary bus 42 side included in the data relay system 62, the lower level device 32 having an outstanding number of 2 or more (the number of requests that can be processed at one time is 2 or more) is adopted. In addition, the data relay device 12 is provided with a functional configuration for effectively utilizing this.

That is, as shown in FIG. 5, in the data relay system 62 having the low-order apparatus 32 having the function of processing two or more signals at a time, the read request transmission / reception processing unit 52 includes the above-described subsequent information acquisition unit 51A Regardless of whether or not the read data 55 is received from the device 32, when the subsequent information acquisition unit 51A acquires the subsequent read request information described above, a signal based on the subsequent read request information is transmitted to the lower device 32. And independent transmission processing means 52A for transmitting to the network.
The other configuration contents are the same as those in the first embodiment described above, and are therefore omitted.

  Next, referring to FIG. 6, the continuous reading process of the data relay apparatus 12 in the case where the low-order apparatus 32 that can process two or more requests at a time is employed will be described.

  When the read request 71 (1) is asserted from the primary bus 41 side, the read request transmission / reception processing unit 52 reads the read request 71 (1) regardless of the reply status of the confirmation response 73 (1) by the confirmation response reply unit 50. The read request information according to 1) is acquired, and a read request 72 (1), which is a signal based on the read request information, is transmitted to the secondary bus 42 side.

If the subsequent read request 71 (2) is issued from the primary bus 41 side after the confirmation response reply unit 50 returns the confirmation response 73 (1), the read request transmission / reception processing unit 52 includes the subsequent information acquisition unit 51A. The subsequent read request information related to the subsequent read request 71 (2) is acquired at this time, and at this time, regardless of whether the read data transfer unit 55 receives the read data 81 (1) from the lower-level device 32 or not. The independent transmission processing unit 52A is configured to transmit a subsequent read request 72 (2), which is a signal based on the subsequent read request information, to the lower apparatus 32.
As a result, the lower level device 32 that can process two or more requests at a time can be effectively functioned.

  When the return of the read data 81 (1) by the read data transfer unit 55 is completed, the confirmation response reply unit 50 is configured to return a confirmation response to the higher-level device 20.

  Here, referring to FIG. 3 in FIG. 3, in the second embodiment, the read request transmission / reception processing unit 52 transmits the subsequent read request 72 (2) and the read data 81 (2) received in response thereto. ) Can be realized at a timing earlier than in the case of the first embodiment described above, that is, the data relay device 12 Therefore, since the processing capability of the lower-level device can be utilized to the maximum extent, it is possible to further speed up the data processing based on the requests transmitted continuously from the primary bus 41 side.

  Also in FIG. 6, a part of the signal transmitted and received by the related technique shown in FIG. 16 is indicated by a broken line, and the read data 81 (2) is indicated by the “difference in processing completion time” shown here. It is clearly shown that the time until the return of the data (processing completion time) is much earlier than the time until the read data 810 (2) is returned (processing completion time) in the related art.

  In addition, data relay processing related to a subsequent read request (not shown) is also sequentially transmitted according to the data relay device 12 configured to be executed in the same manner as the subsequent read request 71 (2). It is possible to speed up information processing related to requests.

(Description of operation)
Next, the operation of the data relay device 12 shown in FIG. 5 will be described based on the sequence diagram shown in FIG.

  The read request transmission / reception processing unit 52 that has received the read request from the host apparatus 20 acquires read request information corresponding to the read request (FIG. 7: S201), and transmits a signal (read request) based on the read request information to the lower apparatus 32. Then, the confirmation response reply unit 50 sends back a confirmation response to the read request (FIG. 7: S203).

  Next, the read request transmission / reception processing unit 52 that has received the subsequent read request from the higher-level device 20 acquires the subsequent read request information corresponding to the request by the subsequent information acquisition unit 51A (FIG. 7: S204), and the subsequent read A signal based on the request information (subsequent reading request) is transmitted to the lower apparatus 32 by the independent transmission processing means 52A (FIG. 7: S205).

  Subsequently, the read data transfer unit 55 that has received the read data transmitted from the lower apparatus 32 in response to a signal based on the read request information (FIG. 7: S206) transmits a read enable to the upper apparatus 20. (FIG. 7: S207) The read data is returned (FIG. 7: S208).

  Next, the confirmation response reply unit 50 returns a confirmation response (subsequent confirmation response) to the subsequent reading request to the upper apparatus 20 (FIG. 7: S209), and the subsequent reading transmitted from the lower apparatus 32 in response to the subsequent reading request. The read data transfer unit 55 that has received the data (FIG. 7: S210) transmits a read enable to the host device 20 (FIG. 7: S211) and returns the subsequent read data (FIG. 7: S212).

  The execution contents of each step in the above steps S201 to S212 (FIG. 7) may be programmed, and this series of control programs may be realized by a computer. Moreover, although the said operation | movement content was demonstrated in order of the number attached | subjected in FIG. 7 (S201-S212) for convenience, the operation | movement order concerning this 2nd Embodiment is not necessarily limited to this.

(Effects of the second embodiment, etc.)
According to the data relay device 12 in the second embodiment, when the number of outstanding lower-level devices (targets) is 2 or more, data relay processing that effectively uses the processing capability of the lower-level devices can be realized. The time required for the reading process can be further shortened, and the data processing for each successive request can be further speeded up.

Further, the data relay device 12 may be configured to be provided with request information storage processing means 51B which is a component in the first embodiment described above. In this way, it is possible to perform an appropriate data relay process according to the number of outstanding devices of the lower device.
Other effects and the like are the same as those of the first embodiment described above.

[Third Embodiment]
A third embodiment of the data relay apparatus and data relay system according to the present invention will be described with reference to FIGS. Here, the configuration and operation contents of a data relay system in which the secondary side bus is constituted by a plurality of buses will be described. The same reference numerals are used for the same components as those in the first and second embodiments described above.

(Overall configuration)
As shown in FIG. 8, the data relay system 63 in the third embodiment corresponds to a plurality of (here, n: n is an arbitrary natural number) secondary buses 42 (1) to (n) and each of these. Subordinate devices 33 (1) to (n).
The data relay device 13 that performs data relay processing in response to a request from the host device 20 connected to the primary bus 41 is connected to the plurality of secondary buses 42 (1) to (n) and the request Is transmitted to any one of the lower devices 33 (1) to (n) via any one of the plurality of secondary buses 42 (1) to (n).

  Accordingly, the read request transmission / reception processing unit 53 selects the secondary bus 42 (1) from which the signal or data is not transmitted / received according to a preset criterion from among the plurality of secondary buses 42 (1) to (n). -N) and a signal related to a request from the higher-level device 20 for the lower-level device 33 (any one of 1-n) associated with the selected secondary bus (according to the request) Bus selection transmission means 53A for transmitting a signal based on the request information).

  That is, the read request transmission / reception processing unit 53 uses the bus selection / transmission means 53A to select the low-order device 33 (1 to 1) that is in a standby state and has a high priority from the plurality of low-order devices 33 (1) to (n). Any one of n) is selected based on a preset criterion.

  In the third embodiment, when there are a plurality of lower-level devices (secondary buses that are not transmitting and receiving signals and the like) in a standby state, the bus selection transmission unit 53A sets each secondary as the priority. The selection is performed with reference to the numbers assigned to the buses 42 (1) to (n). Here, it is assumed that the numbers in parentheses shown in the secondary buses 42 (1) to (n) and the lower devices 33 (1) to (n) in FIG. Assumes a configuration in which the selection is performed in ascending order of the numbers.

  Further, the read data transfer unit 56 receives read data appropriately transmitted from any of the lower devices 33 (1) to (n) via any one of the plurality of secondary buses 42 (1) to (n). It has a function of transferring to the host device 20 via the primary bus 41. That is, the read data transfer unit 56 is configured to acquire read data from the lower apparatus 33 (any one of 1 to n) selected by the bus selection transmission means 53A and to return this to the upper apparatus 20. .

  Further, the read data transfer unit 56 is configured to execute the data relay apparatus in a situation where the read data processing related to the subsequent read request is completed earlier than the read data processing related to the preceding read request. 13 includes data order control means 56A for controlling the read data to be returned to the primary bus 41 side so that the order of the read data is not reversed.

That is, under such circumstances, the data order control unit 56A stores subsequent read data related to the subsequent read request in an internal memory or the like (not shown), and when the processing of the read data related to the preceding read request is completed. The stored subsequent read data is transmitted to the host device 20.
Other configuration contents are the same as those in the first or second embodiment described above.

  Next, referring to FIG. 9, a primary bus 41 that connects the higher-level device 20 and the data relay device 13 and a secondary bus 42 that connects the data relay device 13 and the lower-level devices 33 (1) to (n). The structure concerning the signal etc. transmitted / received in (1)-(n) is demonstrated.

  Signals and data transmitted / received on the primary bus 41 side are the same as those described with reference to FIG. 2 in the first embodiment described above, and are therefore omitted here.

Further, as shown in FIG. 9, the data relay device 13 that has acquired the request information corresponding to the request (read request or write request) 71 received from the host device 20 receives the read request 72 or the signal based on the request information. The configuration is such that the write request 76 is transmitted to the secondary bus 42 (any one of 1 to n) selected by the bus selection transmission means 53A.
That is, each secondary bus 42 (1) to (n) is configured to appropriately transmit and receive signals and data similar to those of the secondary bus 42 in the first embodiment described above.

  Next, with reference to FIG. 10, the continuous reading process of the data relay apparatus 13 in the third embodiment will be described. Here, it is assumed that a read request is continuously transmitted from the host device 20 in a situation where both the secondary bus 42 (1) and the secondary bus 42 (2) are in a standby state.

  When the read request 71 (1) is asserted from the primary bus 41 side, the read request transmission / reception processing unit 53 causes the read request 71 (1) to be read regardless of the response status of the confirmation response 73 (1) by the confirmation response reply unit 50. The read request information according to 1) is acquired, and the read request 72 (1) is transmitted to the secondary bus 42 (1) side.

  In the third embodiment, when the subsequent information acquisition unit 51A acquires the subsequent read request information, whether or not the read data transfer unit 56 receives the read data 81 (1) from the lower device 33 (1). First, the bus selection / transmission means 53A is in the standby state and sends the subordinate device 33 (2) in the ascending order of the assigned numbers to the subsequent read request information via the secondary bus 42 (2). A subsequent read request 72 (2), which is a signal, is configured to be transmitted.

  In the third embodiment employing a plurality of secondary buses 42 (1) to (n), the secondary bus 42 (1) and the secondary bus 42 (2) are different from each other. Can issue a request to the selected secondary bus 42 (any one of 1 to n) without depending on the number of standings of lower-level devices on the secondary bus side.

  If the subsequent read request 71 (2) has been issued from the primary bus 41 side after the confirmation response reply unit 50 returns the confirmation response 73 (1), the read request transmission / reception processing unit 53 causes the subsequent information acquisition unit 51A to The subsequent read request information related to the subsequent read request 71 (2) is acquired at this time, and at this time, whether or not the read data transfer unit 56 has received the read data 81 (1) from the lower level device 33 (1). Regardless, the bus selection transmission means 53A is configured to transmit a subsequent read request 72 (2), which is a signal based on the subsequent read request information, to the lower level device 33 (2).

  When the return of the read data 81 (1) by the read data transfer unit 56 is completed, the confirmation response reply unit 50 is configured to return a confirmation response 73 (2) to the higher-level device 20.

Here, in the case of FIG. 10 with reference to FIG. 3, in the third embodiment, the read request transmission / reception processing unit 53 transmits the subsequent read request 72 (2) by the bus selection transmission means 53A and receives it accordingly. It can be understood that a series of processes in which the read data transfer unit 56 returns the read data 81 (2) to the requesting higher-level device 20 ends at an earlier timing than in the case of the first embodiment described above.
That is, according to the data relay device 13, the characteristic configuration of the data relay system 63 having the plurality of secondary buses 42 (1) to (n) and the lower devices 33 (1) to (n) is significantly utilized. Therefore, it is possible to speed up data processing based on requests continuously transmitted from the primary bus 41 side, as in the second embodiment described above, regardless of the number of outstanding devices. Become.

  Also in FIG. 10, a part of the signal transmitted and received by the related technology shown in FIG. 16 is indicated by a broken line, and the read data 81 (2) is indicated by the “difference in processing completion time” shown here. It is clearly shown that the time until the return of the data (processing completion time) is much earlier than the time until the read data 810 (2) is returned (processing completion time) in the related art.

  In addition, the data relay processing related to the subsequent read request (not shown) is also transmitted continuously because the data relay device 13 is configured to execute in the same manner as the subsequent read request 71 (2). It is possible to speed up the data processing based on the request.

(Description of operation)
Next, the operation of the data relay device 13 shown in FIG. 8 will be described based on the sequence diagram shown in FIG.

  The read request transmission / reception processing unit 53 that has received the read request from the host device 20 acquires read request information corresponding to the read request (FIG. 11: S301), and sends a signal (read request) based on this information to the lower device 33 (1 ) (FIG. 11: S302), and the confirmation response reply unit 50 returns a confirmation response to the read request (FIG. 11: S303).

  Next, the read request transmission / reception processing unit 53 that has received the subsequent read request from the higher-level device 20 acquires the subsequent read request information corresponding to the request by the subsequent information acquisition unit 51A (FIG. 11: S304), and the bus selection transmission. A signal based on the subsequent reading request information (subsequent reading request) is transmitted to the lower level device 33 (2) selected by the means 53A (FIG. 11: S305).

  Subsequently, the read data transfer unit 56 that has received the read data transmitted from the lower level device 33 (1) in response to the signal based on the read request information (FIG. 11: S306) sets the read enable to the higher level device 20. At the same time as transmitting (FIG. 11: S307), the read data is returned (FIG. 11: S308).

  Next, the confirmation response reply unit 50 returns a subsequent confirmation response to the higher-level device 20 (FIG. 11: S309), and subsequent read data transmitted from the lower-level device 33 (2) in response to a signal based on the subsequent read request information. Is read (FIG. 11: S310), the read enable is transmitted to the host device 20 (FIG. 11: S311), and the subsequent read data is returned (FIG. 11: S312).

  The execution contents of each step in the above steps S301 to S312 (FIG. 11) may be programmed, and the series of each control program may be realized by a computer. In addition, for the sake of convenience, the above operation contents have been described in the order of the numbers given in FIG. 11 (S301 to S312), but the operation order according to the third embodiment is not necessarily limited to this.

(Effects of the third embodiment)
As described above, according to the data relay device 13 in the third embodiment, data relay processing that effectively uses a plurality of buses and a plurality of lower-level devices associated with the bus can be realized, and thus it is necessary for the read processing. The time can be further shortened, and the data processing based on each successive request can be further speeded up.

  That is, by effectively using different buses, the data relay device 13 can issue a request (request) without depending on the number of outstanding devices on the secondary bus side, so that the read process is completed. It is possible to greatly advance the time until.

Further, in a data relay system including a plurality of buses, even when read requests (read requests) transmitted continuously are distributed to different buses and processed, according to the data relay device 13, as described above. Since significant data relay processing can be performed, it is possible to improve the throughput for continuous read requests.
Other effects and the like are the same as those of the first and second embodiments described above.

[Fourth Embodiment]
A data relay device and data relay system according to a fourth embodiment of the present invention will be described with reference to FIGS. The data relay system here is configured to include a plurality of secondary buses as in the third embodiment described above. The same reference numerals are used for the same constituent members as those in the first to third embodiments described above.

(Overall configuration)
As shown in FIG. 12, the data relay system 64 according to the fourth embodiment includes lower-order devices 33 (1) to (n) associated with each of the plurality of secondary buses 42 (1) to (n). The host device 20 is connected to the primary bus 41, and the data relay device 14 performs data relay processing in response to a request from the host device 20. Here, in particular, the data relay device 14 having components different from those of the above-described third embodiment will be described.

  When the data relay device 14 receives a write request from the higher-level device 20, the data relay device 14 responds to the write request regardless of whether the confirmation response reply unit 50 sends back a confirmation response (without waiting for the reply). A write request information acquisition processing unit 57 for acquiring and storing the corresponding write request information, and after the confirmation response reply unit 50 returns a confirmation response to the write request, write data corresponding to the write request is sent to the host device. 20 and the write data transfer unit 58 that transfers this to the lower-level device in the standby state, and when the write data transfer unit 58 acquires the write data, the write request information acquisition processing unit 57 stores the write data. And a write request transmission processing unit 59 that transmits a signal based on the written request information to the lower-level device in the standby state.

  The write request transmission processing unit 59 includes a bus selection unit 59A that selects a lower-level device in the standby state according to a preset criterion. That is, the write request transmission processing unit 59 transmits a signal based on the write request information to the lower-level device 33 (any one of 1 to n) selected by the bus selection unit 59A in the same manner as the bus selection transmission unit 53A described above. At the same time, the write data transfer unit 58 is configured to transmit the write data.

Also, the read request transmission / reception processing unit 54 returns the write data transfer unit 58 when the confirmation response reply unit 50 returns a confirmation response to the write request and receives a subsequent read request from the host device 20. Regardless of the state of progress of the data transfer process according to the above (regardless of the data transfer process), the write data transfer unit 58 outputs a signal based on the subsequent read request information acquired by the subsequent information acquisition unit 51A. It is configured to transmit to a lower-level device that is different from the transferred lower-level device and is in a standby state (another lower-level device in a standby state).
The subordinate apparatus which becomes the transmission destination here employs a configuration in which the bus selection / transmission means 53A selects in the same manner as described above.
Other configuration contents are the same as those in the first to third embodiments described above.

  Next, with reference to FIG. 13, the continuous reading process of the data relay apparatus 14 in the fourth embodiment will be described. Here, it is assumed that a read request is continuously transmitted from the host device 20 in a situation where both the secondary bus 42 (1) and the secondary bus 42 (2) are in a standby state.

When the write request 71W (1) is asserted from the primary bus 41 side, the write request information acquisition processing unit 57 acquires the read request information without waiting for the confirmation response 73W (1) to be returned by the confirmation response reply unit 50. It is configured to keep.
In addition, after the confirmation response reply unit 50 returns the confirmation response 73W (1), the write data transfer unit 58 asserts write enable for the requested data to the higher-level device 20, thereby writing data (write data) 91 ( 1), and the write request transmission processing unit 59 is configured to transmit the write request 76 (1) to the secondary bus 42 (1).

  If the subsequent read request 71 (2) is issued from the primary bus 41 side after the confirmation response reply unit 50 returns the confirmation response 73W (1), the read request transmission / reception processing unit 54 includes the subsequent information acquisition unit 51A. The subsequent read request information corresponding to this is acquired at the same time, and the secondary bus 42 (selected by the bus selection transmission means 53A) regardless of whether the writing (write) on the secondary bus 42 side is completed or not. The subsequent write request 72 (2) is transmitted to 2).

  The confirmation response reply unit 50 returns a confirmation response 73 (2) after the processing of the write data 91 (1) on the primary bus 41 side is completed, and the read data transfer unit 56 receives on the secondary bus 42 side. The read data 81 (2) is transferred to the primary bus side.

  Also in the fourth embodiment, the data relay device 14 does not depend on the number of standings of the secondary device on the secondary bus side, and the secondary bus 42 selected by the bus selection transmission means 53A (any one of 1 to n). ) Request.

  As described above, according to the data relay device 14, the characteristic configuration of the data relay system 64 having the plurality of secondary buses 42 (1) to (n) and the lower level devices 33 (1) to (n) is significantly utilized. Therefore, it is possible to speed up the data processing for requests sequentially transmitted from the primary bus 41 side regardless of the processing capability of the lower-level device.

  In addition, in FIG. 13, when a read request (read request) is issued after a write request (write request) is issued, a part of a signal and the like transmitted and received by the existing related technology is indicated by a broken line Then, according to the “difference in processing completion time” shown here, the time until the read data 81 (2) is returned (processing completion time) is the time until the read data 810 (2) is returned by the related technology ( It is clearly shown that it is very early compared to the processing completion time.

  The existing related technology adopts a configuration in which a subsequent read request 720 (2) is transmitted to the secondary bus side after returning a confirmation response (not shown: returned at the same timing as the confirmation response 73 (2)). As a result, the time at which the read data 810 (2) received from the secondary bus side is returned to the primary bus side is delayed, resulting in the above difference.

  In addition, since the data relay device 14 is configured to execute a data relay process related to a subsequent read request (not shown), similarly to the subsequent read request 71 (2), the data relay device 14 transmits continuously. The data processing based on the required request can be speeded up.

(Description of operation)
Next, the operation of the data relay device 14 shown in FIG. 12 will be described based on the sequence diagram shown in FIG.

The data relay device 14 that has received the write request from the host device 20 acquires the write request information corresponding to the write request in the write request information acquisition processing unit 57 (FIG. 14: S401).
Next, the confirmation response reply unit 50 returns a confirmation response to the write request to the higher-level device 20 (FIG. 14: S402).

  Next, the read request transmission / reception processing unit 54 that has received the subsequent read request from the higher-level device 20 acquires the subsequent read request information corresponding to the request by the subsequent information acquisition unit 51A and stores it in the internal memory or the like (not shown). Process (FIG. 14: S403).

  Further, after the confirmation response reply unit 50 returns a confirmation response to the write request, the write data transfer unit 58 asserts write enable for the requested data to the host device 20 (FIG. 14: S404). Write data relating to the write request is acquired (FIG. 14: S405).

  Next, the write request transmission processing unit 59 issues a write request, which is a signal based on the write request information, to the subordinate device 33 (1) via the secondary bus 42 (1) (FIG. 14: S406). The data transfer unit 58 transmits the write data acquired as described above (FIG. 14: S407).

  On the other hand, the read request transmission / reception processing unit 54 that has acquired the subsequent read request information corresponding to the subsequent read request (FIG. 14: S403) sends the bus selection transmission unit 53A regardless of the data transfer processing by the write data transfer unit 58. Then, a signal based on the subsequent read request information is transmitted to the selected lower level device 33 (2) (FIG. 14: S408).

  Next, the confirmation response reply unit 50 returns the subsequent confirmation response to the upper apparatus 20 (FIG. 14: S409), and the subsequent read data transmitted from the lower apparatus 33 (2) in response to the signal based on the subsequent read request information. Is read (FIG. 14: S410), sends a read enable to the host device 20 (FIG. 14: S411) and returns the subsequent read data (FIG. 14: S412).

  The execution contents of each step in the above steps S401 to S412 (FIG. 14) may be programmed, and the series of control programs may be realized by a computer. Moreover, although the said operation content demonstrated for the sake of convenience the order of the number attached | subjected in FIG. 14 (S401-S412), the operation | movement order concerning this 4th Embodiment is not necessarily limited to this.

(Effects of the fourth embodiment)
Even when a write request (write request) and a read request (read request) are continuously transmitted from the host device 20, the data relay device 14 effectively relays information related to each request as described above. It is possible to process the data, and it is possible to speed up the data processing.

  Further, in a data relay system including a plurality of buses, even when a read request is issued after a write request is issued, the data relay device 13 can effectively use different buses as described above. Therefore, it is possible to improve the throughput for the read request after the write request.

In the fourth embodiment, as in the third embodiment described above, a configuration including a plurality of secondary buses and a plurality of lower-level devices associated therewith is adopted. Constituent members similar to the “one secondary bus 42 and the subordinate device 32 having an outstanding number of 2 or more” employed in the second embodiment may be employed. In such a case, in particular, if the data relay device 14 is equipped with a component equivalent to the independent transmission processing unit 52A (FIG. 5) instead of the bus selection transmission unit 53A, a read request is issued continuously after a write request. Even in such a case, the data processing can be speeded up similarly to the above.
Other effects and the like are the same as those of the first and second embodiments described above.

  Each of the above-described embodiments is a preferable specific example in the data relay device, the data relay system, the data relay method, and the program thereof, and may have various technically preferable limitations. However, the technical scope of the present invention is not limited to these embodiments unless specifically described to limit the present invention.

  The following summarizes the main points of the new technical contents of the above-described embodiment, but the present invention is not necessarily limited to this.

(Appendix 1)
A data relay device that transmits a signal related to a request transmitted from a higher-level device connected to a primary bus to a lower-level device connected to a secondary bus, and performs data relay processing according to the request,
A confirmation response reply unit that sends back a confirmation response to the request to the host device;
A read request transmission / reception processing unit that acquires read request information corresponding to the read request as the request received from the higher-level device and transmits a signal based on the read request information to the lower-level device, and
When the read request transmission / reception unit receives the read request, the read request transmission / reception unit executes the acquisition and transmission regardless of whether the confirmation response reply unit returns a confirmation response to the read request. .

(Appendix 2)
In the data relay device according to Appendix 1,
The request is a signal continuously transmitted from the host device,
The read request transmission / reception processing unit, when the confirmation response reply unit returns a confirmation response to the read request and receives a subsequent read request from the higher-level device, the subsequent read corresponding to the subsequent read request A data relay apparatus comprising a subsequent information acquisition means for acquiring request information.

(Appendix 3)
In the data relay device according to Appendix 2,
The data transfer apparatus according to claim 1, wherein the read request transmission / reception processing unit includes request information storage processing means for storing and processing the subsequent read request information acquired by the subsequent information acquisition means.

(Appendix 4)
In the data relay device according to Appendix 2 or 3,
A read data transfer unit that transfers read data transmitted from the lower-level device to the higher-level device in response to a signal based on the read request information;
The read request transmission / reception processing unit transmits a signal based on the subsequent read request information to the lower-level device when the read data transfer unit finishes receiving the read data.

(Appendix 5)
In the data relay device according to Appendix 2 or 3,
When the subordinate device has a function of processing two or more signals at a time,
The read request transmission / reception processing unit further includes an independent transmission processing unit that transmits a signal based on the subsequent read request information to the lower-level device when the subsequent information acquisition unit acquires the subsequent read request information. apparatus.

(Appendix 6)
In the data relay device according to Appendix 2 or 3,
When the secondary bus is constituted by a plurality of secondary buses and the lower order device is constituted by a plurality of lower order devices associated with each of the plurality of secondary buses,
The read request transmission / reception processing unit, when the subsequent information acquisition unit acquires the subsequent read request information, transmits a signal based thereon to a lower-level device in a standby state.

(Appendix 7)
In the data relay device according to appendix 6,
The data transfer device according to claim 1, wherein the read request transmission / reception processing unit includes a bus selection unit that selects a lower-level device in the standby state according to a preset criterion.

(Appendix 8)
In the data relay device according to Appendix 2 or 3,
When the secondary bus is constituted by a plurality of secondary buses and the lower order device is constituted by a plurality of lower order devices associated with each of the plurality of secondary buses,
After the confirmation response reply unit returns a confirmation response to the write request as the request received from the higher-level device, the write data corresponding to the write request is acquired from the higher-level device, and this is in a standby state. It further has a write data transfer unit for transferring to a certain lower device,
The read request transmission / reception processing unit is configured to perform data transfer processing by the write data transfer unit when the confirmation response reply unit returns a confirmation response to the write request and a subsequent read request is received from the host device. Regardless of the data relay apparatus, the data relay apparatus transmits a signal based on the subsequent read request information acquired by the subsequent information acquisition means to another lower-level apparatus in a standby state.

(Appendix 9)
In the data relay device according to appendix 8,
Write request information acquisition processing unit for acquiring and storing write request information corresponding to the write request regardless of the fact that the confirmation response reply unit returns a confirmation response to the write request when receiving the write request When,
When the write data transfer unit acquires the write data, the write request transmission processing unit transmits a signal based on the write request information stored by the write request information acquisition processing unit to the lower-level device in the standby state And further comprising
The write request transmission processing unit includes a bus selection unit that selects a lower-level device in the standby state according to a preset criterion.

(Appendix 10)
In the data relay device according to Appendix 2 or 3,
When the subordinate device has a function of processing two or more signals at a time,
After the confirmation response reply unit returns a confirmation response to the write request as the request received from the higher-level device, the write data corresponding to the write request is acquired from the higher-level device, and this is in a standby state. It further has a write data transfer unit for transferring to a certain lower device,
The read request transmission / reception processing unit, when the confirmation response reply unit sends back a confirmation response to the write request and receives a read request subsequent to the read request from the host device, the write data transfer unit A data relay apparatus, wherein a signal based on the subsequent read request information is transmitted to the subordinate apparatus regardless of data transfer processing.

(Appendix 11)
A host device connected to the primary bus, a lower device connected to the secondary bus, and a signal relating to a request transmitted from the host device is transmitted to the lower device, and data relay processing corresponding to the request is performed. A data relay system having a data relay device,
11. A data relay system comprising the data relay device according to any one of the supplementary notes 1 to 10 as the data relay device.

(Appendix 12)
A host device connected to the primary bus, a slave device connected to the secondary bus and having a function of processing two or more signals at a time, and a signal relating to a request transmitted from the host device to the slave device A data relay system that transmits and performs data relay processing in response to the request,
11. A data relay system comprising the data relay device according to appendix 5 or 10 as the data relay device.

(Appendix 13)
A host device connected to the primary bus, a plurality of lower devices associated with each of the plurality of secondary buses, and a signal relating to a request transmitted from the host device to any of the plurality of lower devices A data relay system that transmits and performs data relay processing in response to the request,
10. A data relay system comprising the data relay device according to any one of appendices 6 to 9 as the data relay device.

(Appendix 14)
A data relay device that transmits a signal related to a request transmitted from a higher-level device connected to the primary bus to a lower-level device connected to the secondary bus, and performs data relay processing according to the request,
Receiving a read request as the request from the host device;
Acquires the read request information corresponding to the read request and transmits a signal based on the read request information to the lower-level device,
A data relay method characterized by returning a confirmation response to the request to the higher-level device.

(Appendix 15)
In the data relay method according to appendix 14,
The request is a signal continuously transmitted from the host device,
After returning the confirmation response,
Receiving a subsequent read request from the higher-level device and acquiring subsequent read request information according to the received read request;
Receiving read data transmitted from the lower-level device in response to a signal based on the read request information;
A data relay method, wherein a signal based on the subsequent read request information is transmitted to the lower-level device.

(Appendix 16)
In the data relay method according to appendix 14,
The request is a signal continuously transmitted from the host device,
When the subordinate device has a function of processing two or more signals at a time,
After returning the confirmation response,
Receiving a subsequent read request from the higher-level device and acquiring subsequent read request information according to the received read request;
Send a signal based on this subsequent read request information to the lower-level device,
A data relay method characterized by receiving read data transmitted from the lower apparatus in response to a signal based on the read request information and transferring the read data to the upper apparatus.

(Appendix 17)
In the data relay method according to appendix 14,
When the secondary bus is constituted by a plurality of secondary buses and the lower order device is constituted by a plurality of lower order devices associated with each of the plurality of secondary buses,
After returning the confirmation response,
Receiving a subsequent read request from the higher-level device and acquiring subsequent read request information according to the received read request;
Send a signal based on this subsequent read request information to the lower-level device in the standby state,
A data relay method characterized by receiving read data transmitted from the lower apparatus in response to a signal based on the read request information and transmitting the read data to the upper apparatus.

(Appendix 18)
A data relay device that transmits a signal related to a request transmitted from a higher-level device connected to the primary bus to a lower-level device connected to the secondary bus, and performs data relay processing according to the request,
The request is a signal continuously transmitted from the host device,
When the secondary bus is constituted by a plurality of secondary buses and the lower order device is constituted by a plurality of lower order devices associated with each of the plurality of secondary buses,
While receiving a write request as the request from the host device, obtain write request information according to the write request,
A confirmation response to the write request is sent back to the host device,
When a read request subsequent to the write request is received from the host device, subsequent read request information corresponding to the request is acquired, and a lower device in a standby state is selected according to a preset criterion. ,
A data relay method, comprising: transmitting a signal based on the subsequent read request information to the selected subordinate device.

(Appendix 19)
A data relay device that transmits a signal related to a request transmitted from a higher-level device connected to the primary bus to a lower-level device connected to the secondary bus, and performs data relay processing according to the request,
An acknowledgment reply means for replying an acknowledgment to the request to the higher-level device;
When the read request as the request is received from the host device, the read request information corresponding to the read request is acquired and the confirmation response is returned by the confirmation response reply unit. A data relay program for causing a computer provided in advance in the data relay apparatus to function as a read request transmission / reception processing means for transmitting a signal based on the above to the lower apparatus.

(Appendix 20)
In the data relay program according to appendix 19,
The request is a signal continuously transmitted from the host device,
Subsequent information for obtaining a subsequent read request information corresponding to the subsequent read request when a confirmation response to the read request is returned by the confirmation response reply unit and a subsequent read request is issued from the higher-level device. A data relay program for causing the computer to function as acquisition means.

(Appendix 21)
In the data relay program according to appendix 20,
A data relay program for causing the computer to function as request information storage processing means for storing and processing the subsequent read request information acquired by the subsequent information acquisition means.

(Appendix 22)
In the data relay program according to appendix 20,
When the subordinate device has a function of processing two or more signals at a time,
A data relay program for causing the computer to function as an independent transmission processing unit that transmits a signal based on the subsequent reading request information to the lower-level device when the subsequent information acquisition unit acquires the subsequent reading request information.

(Appendix 23)
In the data relay program according to appendix 20,
When the secondary bus is constituted by a plurality of secondary buses and the lower order device is constituted by a plurality of lower order devices associated with each of the plurality of secondary buses,
Bus selection transmission means for selecting a lower-level device in a standby state according to a preset criterion and transmitting a signal based on the subsequent read request information acquired by the subsequent information acquisition means to the selected lower-level device A data relay program for causing the computer to function as.

(Appendix 24)
In the data relay program according to appendix 20,
When the secondary bus is constituted by a plurality of secondary buses and the lower order device is constituted by a plurality of lower order devices associated with each of the plurality of secondary buses,
After the confirmation response reply unit returns a confirmation response to the write request as the request received from the host device, the write data corresponding to the write request is acquired from the host device and is in a standby state. Write data transfer means for transferring to the lower device,
When the confirmation response reply unit sends back a confirmation response to the write request and receives a subsequent read request from the host device, it is set in advance regardless of the data transfer processing by the write data transfer means. In addition to selecting a lower-level device in a standby state according to the criteria, the independent transmission means for transmitting a signal based on the subsequent reading request information acquired by the subsequent information acquisition means to the selected lower-level device, A data relay program that allows computers to function.

  The present invention can be applied to all technologies related to LSI (Large Scale Integration) design, FPGA (Field Programmable Gate Array) design, and the like.

11, 12, 13, 14, 100 Data relay device (user circuit)
20,200 Host device (master)
31, 32, 33 (1) to (n), 300 Subordinate device (target)
41, 410 Primary bus 42, 42 (1) to (n), 420 Secondary bus 50 Confirmation response reply unit 51, 52, 53, 54 Read request transmission / reception processing unit 51A Subsequent information acquisition unit 51B Request information storage processing unit 52A Independent transmission processing unit 53A Bus selection transmission unit 55, 56 Read data transfer unit 56A Data order control unit 57 Write request information acquisition processing unit 58 Write data transfer unit 59 Write request transmission processing unit 59A Bus selection unit 61, 62, 63, 64 , 600 Data relay system

Claims (5)

A data relay device that transmits a signal related to a request transmitted from a higher-level device connected to a primary bus to a lower-level device connected to a secondary bus, and performs data relay processing according to the request,
A confirmation response reply unit that sends back a confirmation response to the request to the host device;
A read request transmission / reception processing unit that acquires read request information corresponding to the read request as the request received from the higher-level device and transmits a signal based on the read request information to the lower-level device, and
The read request transmission / reception unit, when receiving the read request, executes the acquisition and transmission irrespective of the confirmation response reply unit returning a confirmation response to the read request ,
The request is a signal continuously transmitted from the host device,
The read request transmission / reception processing unit, when the confirmation response reply unit returns a confirmation response to the read request and receives a subsequent read request from the higher-level device, the subsequent read corresponding to the subsequent read request Having subsequent information acquisition means for acquiring request information;
A read data transfer unit that transfers read data transmitted from the lower-level device to the higher-level device in response to a signal based on the read request information;
The read request transmission / reception processing unit, when the read data transfer unit has finished receiving the read data, transmits a signal based on the subsequent read request information to the lower-level device,
The read data transfer unit stores the read data related to the subsequent read request, and when the processing of the read data related to the preceding read request is completed, the stored read data is stored in the host device. data relay apparatus, characterized in that chromatic data sequence control means for transmitting against. In the data relay device according to claim 1 ,
When the subordinate device has a function of processing two or more signals at a time,
The read request transmission / reception processing unit further includes an independent transmission processing unit that transmits a signal based on the subsequent read request information to the lower-level device when the subsequent information acquisition unit acquires the subsequent read request information. apparatus. In the data relay device according to claim 2 ,
When the secondary bus is constituted by a plurality of secondary buses and the lower order device is constituted by a plurality of lower order devices associated with each of the plurality of secondary buses,
The read request transmission / reception processing unit, when the subsequent information acquisition unit acquires the subsequent read request information, transmits a signal based thereon to a lower-level device in a standby state. A data relay device that transmits a signal related to a request transmitted from a higher-level device connected to a primary bus to a lower-level device connected to a secondary bus, and performs data relay processing according to the request,
A confirmation response reply unit that sends back a confirmation response to the request to the host device;
A read request transmission / reception processing unit that acquires read request information corresponding to the read request as the request received from the higher-level device and transmits a signal based on the read request information to the lower-level device, and
The read request transmission / reception unit, when receiving the read request, executes the acquisition and transmission irrespective of the confirmation response reply unit returning a confirmation response to the read request,
The request is a signal continuously transmitted from the host device,
The read request transmission / reception processing unit, when the confirmation response reply unit returns a confirmation response to the read request and receives a subsequent read request from the higher-level device, the subsequent read corresponding to the subsequent read request Having subsequent information acquisition means for acquiring request information;
When the secondary bus is constituted by a plurality of secondary buses and the lower order device is constituted by a plurality of lower order devices associated with each of the plurality of secondary buses,
After the confirmation response reply unit returns a confirmation response to the write request as the request received from the higher-level device, the write data corresponding to the write request is acquired from the higher-level device, and this is in a standby state. It further has a write data transfer unit for transferring to a certain lower device,
The read request transmission / reception processing unit is configured to perform data transfer processing by the write data transfer unit when the confirmation response reply unit returns a confirmation response to the write request and a subsequent read request is received from the host device. Regardless of, a signal based on the subsequent read request information acquired by the subsequent information acquisition means is transmitted to another lower-level device in a standby state ,
Write request information acquisition processing unit for acquiring and storing write request information corresponding to the write request regardless of the fact that the confirmation response reply unit returns a confirmation response to the write request when receiving the write request When,
When the write data transfer unit acquires the write data, the write request transmission processing unit transmits a signal based on the write request information stored by the write request information acquisition processing unit to the lower-level device in the standby state And further comprising
The write request transmission processing unit, a data relaying apparatus, characterized in that have a bus selecting means for selecting according to a preset reference lower device in the state in the standby. A host device connected to the primary bus, a lower device connected to the secondary bus, and a signal relating to a request transmitted from the host device is transmitted to the lower device, and data relay processing corresponding to the request is performed. A data relay system having a data relay device,
Wherein as the data relay apparatus, data relay system characterized in that a data relay apparatus according to any one of claims 1 to 4.

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