JPH09102799A - Data exchange switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the transfer rate of each input side storage part and output side storage part to the transfer rate of a medium by excluding the sharing of the medium, and also, to suppress data rejection inside a switch. SOLUTION: In a selecting part 3, a transfer request 5 whose transfer destination is each output side storage part 2a to 2n is monitored individually, and one from among plural transfer requests whose transfer destinations are the same is selected, and transfer permission 6 is outputted, and simultaneously, a selector control signal 7 is outputted to a selector switch part 4 on the basis of this transfer permission. In the selector switch part 4, by controlling selector parts installed for every output side storage part 2a to 2n on the basis of the selector control signal 7, one of data 8 from each input side storage part 1a to 1n is selected and connected respectively as the data 9 to the output side storage part 2a to 2n.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data exchange switch, and more particularly to a data exchange switch for exchanging data of an arbitrary length input to a predetermined input side accommodating section to a predetermined output side accommodating section.

[0002]

2. Description of the Related Art Conventionally, a plurality of input side accommodating portions (input ports) and output side accommodating portions (output ports) are provided, and a predetermined medium (physical A data exchange switch for transferring data of arbitrary length via a medium has a configuration as shown in FIG.

In the input side accommodating sections 101a to 101n, in response to data writing from the outside to the memory 111, the input control section 113 requests the system bus control section 103 to transfer data via the medium, here the system bus 104. Output transfer requests 105a to 105n. In response to this, the system bus control unit 103 determines that the system bus 1
The use status of No. 04 is checked, and if it is available, the transfer permission 106a to 106n that permits data transfer is output to the input control unit 113 of the transfer request source.

In response to the reception of the transfer permission 106a to 106n, the input control unit 113 instructs the data transfer unit 112 to start the data transfer, and in response to this, the data transfer unit 112 reads the data from the memory 111. Output to the system bus 104. Output side accommodating portions 102a to 102
In the data receiving unit 121 of n, the data transfer is ended by receiving the data addressed to the own port from the system bus 104 and writing it in the memory 122, and the data is read out from the memory 122 to the outside at a predetermined timing thereafter. It was a thing.

[0005]

Therefore, in such a conventional data exchange switch, a plurality of input side accommodating portions and output side accommodating portions share the medium (physical medium), here the system bus 104, and By arbitrating transfer requests for using the media or by scheduling according to a predetermined rule, data is transferred between arbitrary input-side accommodating units and output-side accommodating units. The sum of the output transfer rates at which data can be output from the side accommodation unit and the sum of input transfer rates at which the output accommodation units can receive data are limited by the data transfer rate of this physical medium. The output transfer rate of data in the side accommodation section and the input transfer rate of data in each output accommodation section approaches the data transfer rate of the media. Take, the number of each of the accommodating portion is a problem that is limited.

On the other hand, for the purpose of speeding up the data transfer rate of the medium itself, a tag indicating an output destination is added to the data in the input side accommodation section, and the data is transferred at the intersection which forms a switch based on the tag. Although it is proposed to distribute the data, in such a configuration, when multiple data of the same destination arrive at the intersection at the same time, data is discarded. Therefore, it is necessary to provide a buffer for performing competition control, and there is a problem that the buffer capacity increases as the number of intersections increases. The present invention is to solve such a problem, and eliminates sharing of media, and improves the output transfer rate of each input side accommodation section and the input transfer rate of the output side accommodation section up to the transfer rate of media. It is an object of the present invention to provide a data exchange switch capable of suppressing the data discard inside the switch.

[0007]

In order to achieve such an object, in the data exchange switch according to the present invention, among the transfer requests output from the respective input side accommodating parts, the output side accommodating part which is the transfer destination is Select one of the transfer requests for each of the same transfer requests, and send a selector control signal instructing to select data from the input-side accommodating unit that is the transfer source as the data to be transferred to the output-side accommodating unit that is the transfer destination. A switch control unit that outputs a transfer permission to the input side accommodating unit of the transfer source, and each input side as data to be transferred to each output side accommodating unit based on the selector control signal from the switch control unit. By selecting one of the data output from the accommodating units, each input-side accommodating unit and each output-side accommodating unit are connected in a one-to-one correspondence, and transfer is performed according to the transfer permission. In which the data output from the input-side housing portion of the output-side housing portion to be respectively forwarded and a selector switch means for transferring a single direction.

Therefore, by the switch control means, one of the transfer requests is selected for each transfer request having the same output side accommodating section as the transfer destination, and the transfer source is selected as data to be transferred to the output side accommodating section as the transfer destination. A selector control signal for instructing to select data is output from the input-side accommodating unit that is to be set, and a transfer permission is output to the input-side accommodating unit that is the transfer source. Further, the selector switch means selects, based on the selector control signal from the switch control means, one of the data output from the input side accommodating sections as the data to be transferred to the output side accommodating section, and the transfer permission is given. Accordingly, the data output from the input side accommodating portion of the transfer source is transferred to the output side accommodating portion that is the transfer destination.

Further, the switch control means is provided for each output side accommodating section, the corresponding output side accommodating section selects any one of a plurality of transfer requests as transfer destinations, and permits transfer to the transfer source. Based on the transfer permission output from each selection unit and the output permission from each selection unit, the data is selected from the input side accommodation unit which is the transfer source as the data to be transferred to the output side accommodation unit which is the transfer destination. The selector switch means has a signal generation unit that outputs a selector control signal to instruct, and the selector switch means distributes the data output from each input accommodation unit to each output accommodation unit and each output accommodation unit. Data to be transferred to the corresponding output-side accommodating section, which is provided for each of the input-side accommodating sections and which is distributed by the distributing section based on the selector control signal from the switch control means. In which a selector unit for selecting and.

Therefore, the selection section of the switch control means selects any one of the plurality of transfer requests to which the individual output side accommodating sections are transfer destinations, outputs the transfer permission, and generates a signal based on the transfer permission. The section generates a selector control signal. Further, the selector unit of the selector switch means selects, based on the selector control signal, any one of the data from the respective input side accommodation units distributed by the distribution unit as the data to be transferred to the corresponding output side accommodation unit. It

Further, a transfer request bus for transferring a transfer request output from each input side accommodating unit and a transfer permission bus for transferring a transfer permission output from each selecting unit are provided, and these buses are time-divisionally divided. The transfer request and the transfer permission are exchanged using the slot provided in the above. Therefore, the transfer request and the transfer permission are exchanged via the transfer request bus and the transfer permission bus provided in common.

Further, each slot is provided for each input side accommodating section serving as a transfer source, and each input side accommodating section inserts a transfer destination number indicating an output side accommodating section of a transfer destination into its own slot. The transfer request is output, and each selection unit outputs the transfer permission by inserting the transfer destination number indicating the output side accommodation unit which is the transfer destination into the slot of the input side accommodation unit which is the transfer source. is there. Therefore, the transfer source of the transfer request and the transfer permission is recognized based on the time position of each slot, and the transfer destination of the transfer request and the transfer permission is recognized by the transfer destination number inserted in these slots.

Further, each selection section is arranged in the corresponding output side accommodation section. Therefore, the selection unit is mounted only on the output side accommodation portion mounted as needed. Further, each signal generation unit is configured to generate a selector control signal from each selection unit based on the transfer destination number inserted in the slot of the input side accommodation unit which is the transfer source on the transfer permission bus. . Therefore, the signal generation unit generates the selector control signal based on the transfer destination number inserted in the slot of the input side accommodating unit that is the transfer source on the transfer permission bus.

[0014]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a data exchange switch according to a first embodiment of the present invention. In FIG. 1, 1a to 1n are input side accommodating parts, 2a to 2n are output side accommodating parts, and 3 is an input side. Transfer request 5 from the accommodation units 1a to 1n
Among the output side accommodating sections 2a to 2n, the switch control section 4 which selects one of the output side accommodating sections 2a to 2n and outputs the transfer permission 6 and outputs a predetermined selector control signal 7 is based on the selector control signal 7. It is a selector switch section that selects and connects any one of the input side accommodation sections to the output side accommodation sections 2a to 2n.

In the input side accommodating portions 1a to 1n, 11 is a memory for temporarily holding data input from the outside,
Reference numeral 12 denotes a data transfer unit that outputs the data in the memory 11 as read data 8 to the selector switch unit 4, and reference numeral 13 denotes a transfer request 5 that requests data transfer to the switch control unit 3 in response to data writing to the memory 11. It is an input control unit that outputs and instructs the data transfer unit 12 to start data transfer according to the transfer permission 6. In addition, the output side accommodating portions 2a to 2
In n, 21 is a data receiving unit that receives the data 9 output from the selector switch unit 4, and 22 is a memory that temporarily holds the data received by the data receiving unit 21 until it is read from the outside.

FIG. 2 is a block diagram showing the configuration of the switch control section. In FIG. 2, 31a to 31n are provided corresponding to the output side accommodating sections 2a to 2n, respectively. To 2n for each input side accommodating portion 1a
Selection units that detect a transfer request from 1n to 1n and select one of them and output a transfer permission to the input side accommodating units 1a to 1n, and 32a to 32n are selection units 31a to 31.
It is a signal generation unit that is provided for each n and outputs selector control signals 7a to 7n by encoding the transfer permission output from each of the selection units 31a to 31n.

For example, in FIG. 2, the selection unit 31a corresponds to the output side accommodation unit 2a, and the transfer requests 5aa to 5na with the output side accommodation unit 2a as the data transfer destination are input side accommodation units 1a to 1n. Is input to the selection unit 31. As a result, the selection unit 31a centrally manages the transfer requests 5aa to 5na with the output-side accommodating unit 2a as the data transfer destination, selects any of the transfer requests 5aa to 5na, and selects the transfer request 5aa to 5na. Input side accommodating unit 1 of the output transfer source
Transfer permission 6aa to 6na is output to a to 1n.

Further, the signal generator 32a includes a selector 3
The respective transfer permits 6aa to 6na output from 1a are input, and by encoding these transfer permits 6aa to 6na, a selector control signal 7a is generated and output to the selector switch unit 4. . In this way, the switch control unit 3 includes the output side storage units 2a to 2a.
A similar configuration is provided for every 2n. The transfer request 5an and the transfer permission 6an respectively indicate a transfer request from the input side accommodating section 1a having the output side accommodating section 2n as a data transfer destination and a transfer permission for the transfer request.

FIG. 3 is a block diagram showing the configuration of the selector switch unit 4. In FIG. 3, 41 is data 8a-8n output from each of the input side accommodating units 1a-1n.
A distribution unit for distributing each of the output side storage units 2a to 2n,
42a to 42n are provided corresponding to the respective output accommodating sections 2a to 2n, and the selector 8 from the switch control section 3 selects any one of the data 8a to 8n distributed by the distributing section 41 for each of the output accommodating sections 2a to 2n. Select based on the control signals 7a to 7n, and store the data 9a in the corresponding output side accommodating units 2a to 2n.
It is a selector unit that outputs as 9n.

Next, the operation of the present invention will be described with reference to FIG. FIG. 4 is a timing chart showing the operation of the data exchange switch, and the same signals as those in the above description (FIGS. 2 and 3) are designated by the same reference numerals. In FIG.
a ', 8b' and 9n 'are data 8a, 8b and 9
It is a data valid signal indicating the valid period of n, and each data 8
Similar to a, 8b and 9n, input side accommodating portions 1a, 1b
And is output from the selector unit 42n.

When any data is externally written to the memory 11 of the input side accommodating section 1a, the input control section 13 recognizes the transfer destination of the data via the data transfer section 12. For example, when the transfer destination is the output side accommodation unit 2n, the transfer request 5an (active = “L” level) with the output side accommodation unit 2n as the transfer destination is the input control unit 1
3 is output.

On the other hand, when the data having the transfer destination as the output side accommodating section 2n is externally written into the memory 11 of the input side accommodating section 1b, the same operation as described above is performed in the input side accommodating section 1b. The input control unit 13 outputs a transfer request 5bn (active = “L” level) with the output side accommodation unit 2n as a transfer destination. In this case, since the transfer requests 5an and 5bn output from the input side accommodating units 1a and 1b are transferred to the output side accommodating unit 2n, respectively, the selecting units 31 are both selected.
n (see FIG. 2).

Each selection section 31a-31 of the switch control section 3
n constantly monitors the transfer requests with the corresponding output side accommodating units 2a to 2n as the transfer destinations, and particularly, in the selecting unit 31n, the input side accommodating unit 1a with the output side accommodating unit 2n as the transfer destination. Transfer requests 5an to 5n output from
n is monitored, and in response to the detection of any transfer request, the transfer permission corresponding thereto is output. Further, as described above, a plurality of transfer requests having the same transfer destination, for example, the transfer request 5a.
When n and 5bn are input, any one transfer request is selected.

At time T1, the selecting unit 31n detects the transfer requests 5an and 5bn, and when 5an is selected, the selecting unit 31n transfers the transfer permission 6an (to the input side accommodating unit 1a). Active =
"L" level) is output. In this case, the other transfer permits 6bn to 6nn are not output (inactive =
"H" level). These transfer permission 6an to 6nn are also input to the signal generation unit 32n, and the transfer permission 6a
The output states of n to 6nn are coded and output as the selector control signal 7n to the corresponding selector section 42n of the switch selector section 4 (see FIG. 3).

In response to the selector control signal 7n, the selector section 42n controls any of the data 8a to 8n output from the distribution section 41 as the data 9 to be output to the output side accommodating section 2n by controlling the internal switch. Select to connect. Therefore, when the transfer permission 6an is output as described above, based on the selector control signal 7n,
The data 8a from the input side accommodation unit 1a is selected.

On the other hand, the input control section 13 of the input side accommodating section 1a which has detected the transfer permission 6an outputs a transfer start instruction to the data transfer section 12, and accordingly the data transfer section 1a.
2 outputs data 8a, and this data 8
A data valid signal 8a ′ (active = “L” level) indicating the valid period of a is output. The data 8a and the data valid signal 8a 'are input to the switch selector unit 4 and are distributed to the selector units 42a to 42n by the distribution unit 42.
Distributed to

Here, as described above, the selector unit 42n
Since the data 8a has already been selected at, the data 8a and the data valid signal 8a 'output from the input side accommodating portion 1a are changed to the data 9n and the data valid signal 9a.
It is transferred to the output side accommodating section 2n as n '.
In response to this, the data receiving unit 21 of the output side accommodation unit 2n
Sequentially receives the data 9n with reference to the data valid period 9n 'and stores the data 9n in the memory 22.

In response to the end of the output of the data 8a, the input side accommodating portion 1a stops the output of the transfer request 5an which is continuously output during the data output (inactive =
"H" level). The switch control unit 3 uses the transfer permission 6an.
, The corresponding transfer request 5an is monitored, and in response to the detection of the stop of the transfer request 5an, it is judged that the data output from the input side accommodating section 1a has ended, and the output of the transfer permission 6an is stopped. To do.

Since no transfer permission 6an to 6nn is output, the selector control signal 7n is initialized, and the selector section 42n of the selector switch section 4 is initialized.
Becomes a non-selected state (initial state). At time T2 thereafter, the switch control unit 3 starts monitoring the next transfer request. When the transfer permission is not output for the output transfer request, the input control unit 13 of each of the input side accommodating units 1a to 1n continuously outputs the transfer request.

Therefore, the transfer request 5bn from the input side accommodating section 1b which has not been selected at the time T ₁ is output at the time T ₂ and is detected by the switch control section 3. Here, the switch control unit 3
When the transfer request 5bn is selected by, the transfer permission 6bn is output in the same manner as described above, the selector control signal 7n is output from the signal generation unit 32n, and the data 8b is connected as the data 9n. The output of the data 8b is started from the storage unit 1b.

As described above, as means for performing exchange control,
Corresponding to each output side accommodating section 2a to 2n, selecting sections 31a to 3 for monitoring a transfer request having the output side accommodating section as a transfer destination.
1n and a signal generator 32a that outputs selector control signals 7a to 7n based on the transfer permission output from this selector.
32n are provided in the switch controller 3. Further, as a medium for actually transferring data, the selector control signal 7a corresponding to each of the output side accommodating portions 2a to 2n is provided.
.. 7n, the selector switch section 4 is provided with selector sections 42a to 42n for selectively connecting any of the data from the input side accommodation sections 1a to 1n as data to the output side accommodation section.

Therefore, each selection unit for determining whether or not the transfer is possible is output according to the transfer request from each of the input side accommodating units 1a to 1n and the empty / occluded state of the output side accommodating units 2a to 2n corresponding to the transfer request. Since each side accommodation unit 2a to 2n is provided, the means for performing exchange control and the medium for actually transferring data are separated, and only one transfer request is selected for each output accommodation unit. It is possible to prevent the data discarding inside the switch.

Further, the selector sections 42a to 42a are generated by the selector control signals 7a to 7n generated based on the transfer permission.
By controlling n, each of the output side accommodating portions 2a-2
n and one of the input side accommodating sections 1a to 1n can be connected in a one-to-one manner via the corresponding selector sections 42a to 42n, media sharing is eliminated, and the output transfer rate of each input side accommodating section is eliminated. Also, the input transfer rate of each output side accommodating section can be increased to the media transfer rate.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing a data exchange switch according to the second embodiment of the present invention, and the same or equivalent parts as those in the above description (see FIG. 1) are denoted by the same reference numerals. In FIG. 5, 5'denotes a transfer request bus that multiplexes and transfers various transfer requests in a time division manner.
Reference numeral 6'denotes a transfer permission bus that multiplexes and transfers various types of transfer permission in a time division manner, and 15 a control bus that outputs a frame signal and a clock signal as control signals for the transfer request bus 5'and the transfer permission bus 6 '. .

1a 'to 1n' are input side accommodating units 2a 'having an input control unit 13' for transmitting and receiving a transfer request and a transfer permission by the transfer request bus 5'and the transfer request bus 6 '.
˜2n ′ monitors the transfer request output to the transfer request bus 5 ′ with the self-accommodating unit as the transfer destination, and outputs a predetermined transfer permission to the transfer permission bus 6 ′ according to the detection of the transfer request. The output side accommodating section 3 ′ having the section 23 is a switch control section 10 which monitors various transfer authorizations output to the transfer authorization bus 6 ′ and outputs a corresponding selector control signal 7.
Is a pair mink generation unit that outputs a frame signal and a clock signal to the control bus 15.

In the above-described first embodiment (see FIG. 1), when the transfer request 5 and the transfer permission 6 are transmitted and received between the input side accommodating units 1a to 1n and the switch control unit 3,
Although they are performed via independent signal lines respectively, in the second embodiment, the transfer request bus 5'and the transfer permission bus 6'are provided to transfer the transfer request and the transfer permission in a time division manner. It is something that is done.

Actually, as shown in FIG. 6, the input control units 13 'of the input side accommodating units 1a' to 1n 'are connected to the transfer request bus 5'and the transfer permission bus 6', respectively. , The selection unit 2 of each of the output side accommodation units 2a 'to 2n'
3 are connected to each other, and these input control units 13 '
The frame signal and the clock signal are supplied from the timing generation unit 10 to the selection unit 23 via the control bus 15.

FIG. 7 is a timing chart showing a transmission / reception operation of a transfer request and a transfer permission via the transfer request bus and the transfer permission bus. On the transfer request bus 5'and the transfer permission bus 6 ', based on the clock signal 17, slots 5a' to 1n 'corresponding to the respective input side accommodating portions 1a' to 1n '.
5n ′ and 6a ′ to 6n ′ are provided in a time division manner and are repeated based on the frame signal 16.

The transmission of the transfer request is performed by inputting the output side accommodating units 2a 'to 2n in the slots 5a' to 5n 'on the transfer request bus 5'corresponding to the request side input accommodating units 1a' to 1n '.
This is done by storing information indicating n '. Also,
The transfer permission is transmitted by the input side accommodating units 1a ′ to 1 of the request source.
slots 6a 'on the transfer permission bus 6'corresponding to n'
6n 'is stored by storing information indicating the output side accommodating units 2a' to 2n 'of the transfer destinations.

Hereinafter, with reference to FIG. 8, the input side accommodating portion 1
The operation of transferring data from a'and 1b 'to the output side accommodating portion 2n' will be described. FIG. 8 is a block diagram showing the input control unit and the selection unit. When data destined for the output-side accommodating section 2n ′ is externally written in the memory 11 (see FIG. 5) of the input-side accommodating section 1a ′, the input control section 1
3'acquires the transfer destination number 53, here "n", which indicates the output side accommodating units 2a 'to 2n' which are the transfer destinations of the data via the data transfer unit 12.

Then, the transfer request inserting section 52 inserts the transfer destination number "n" into the slot 5a 'allocated to itself on the transfer request bus 5', and outputs the transfer request (Fig. 7). Further, when the data addressed to the output side accommodating section 2n ′ is written in the memory 11 of the input side accommodating section 1b ′, the transfer destination number “n” is similarly assigned to the slot 5b ′ on the transfer request bus 5 ′. The transfer request is output by being inserted into.

The transfer request thus inserted into each slot is converted by the conversion unit 6 in the selection unit 23 of the output side accommodation unit 2n '.
It is converted into parallel data at 2 and output as a transfer destination number. Then, the transfer request extraction unit 63 extracts, from the transfer destination numbers from the conversion unit 62, a transfer number that matches the own device number 66, here “n”, as a transfer request addressed to itself.

In this case, slots 5a 'and 5
A transfer number “n” indicating a transfer request addressed to itself is inserted in b ′, and the transfer request selecting unit 64 selects one of these transfer requests, for example, the slot 5a ′ corresponding to the input side accommodating unit 1a ′. Transfer request is selected. In response to this, the transfer permission insertion unit 65 causes the slot of the subsequent frame on the transfer permission bus 6'corresponding to the request source of the selected transfer request, that is, the transfer source, here, the input side accommodation unit 1
Own device number 66 "n" in slot 6a 'corresponding to a'
Is inserted, the transfer permission is output.

In the input control unit 13 'of the input side accommodation unit 1a', the transfer permission extraction unit 54 extracts the transfer destination number from the own slot 6a 'on the transfer permission bus 6'and the comparison unit 55 extracts it. The received transfer destination number is compared with the transfer destination number 53 at the time of the transfer request, and the reception of the transfer permission is recognized according to the match. Therefore, slots 6a 'through "n"
Is extracted, it is the same as the transfer destination number 53 at the time of the transfer request, and therefore a data transfer start instruction is output to the data transfer unit 12.

On the other hand, the switching control section 3'always monitors the slots 6a 'to 6n' on the transfer permission bus 6 ', and the transfer destination numbers inserted in these slots 6a' to 6n 'are monitored. By extracting, as a transfer permission for each of the input side accommodating units 1a ′ to 1n ′, the slot 6
The transfer source is recognized from the time positions a ′ to 6n ′, and the transfer destination is recognized from the transfer destination number. In response to this recognition, selector control signals 7a to 7n for instructing any one of the selector sections 42a to 42n in the selector switch section 7 corresponding to the transfer destination number to selectively connect with the transfer source.
Is output, and the data 8a output from the data transfer unit 12 of the input side accommodating unit 1a ′ of the transfer source is the data 9n via the selector unit 42n, as in the first embodiment.
Is transferred to the output side accommodating portion 2n ′ of the transfer destination.

The input control section 1 of the input side accommodating section 1a '
In 3 ', the transfer request continues to be inserted into the self slot 5a' as described above even during data transfer, and the insertion is stopped in response to the end of data transfer. When the transfer permission is stopped, the selection unit 23 of the output side accommodating unit 2n ′ recognizes the end of the data transfer and starts detecting a new transfer request.

When the transfer request is not accepted, like the transfer request from the input side accommodating section 1b ', the transfer request is continuously output until the transfer permission is received. Has become. Therefore, the transfer request from the input side accommodating section 1b ′ is accepted in response to the detection of a new transfer request by the selecting section 23 of the output side accommodating section 2n ′.

The input control section 13 'and the selection section 2
The timing reproducing section 51 provided in No. 3 always reproduces a predetermined timing signal based on the frame signal 16 and the clock signal 17 from the control bus 15 and supplies it to each section. Each section recognizes each slot time position on the transfer request bus 5 ′ and the transfer permission 6 ′ based on this timing signal.

If there is no data to be transferred in the input control unit 13 ', predetermined information indicating the invalidation of the transfer request is inserted into its own slot on the transfer request bus 5'and each selection is made. It is recognized by the unit 23. Further, in the selection unit 23, with respect to the transfer sources that are not permitted to transfer and the input side accommodating units 1a ′ to 1n ′ that have no transfer request, the transfer is prohibited to the corresponding slots 6a ′ to 6n ′ on the transfer permission bus 6 ′. Is inserted and recognized by each input control unit 13 '.

In the above description, each selection unit 23
Although the above description has been made by taking the case where the above-mentioned is provided in the corresponding output side accommodating portions 2a 'to 2n' as an example, it may be arranged separately from these output side accommodating portions 2a 'to 2n'. Further, in the switch control unit 3 ', each slot 6a' on the transfer permission bus 6'is
The case where the selector control signal 7 is generated by monitoring ~ 6n 'has been described as an example.
The selector control signal 7 may be generated based on the transfer permission individually notified from the transfer request selecting unit 64 of No. 3.

Thus, the transfer request bus 5'and the transfer permission bus 6'are provided, and a plurality of slots are provided on these buses so that the transfer request and the transfer permission are time-division multiplexed and transferred. Therefore, the number of signal lines input / output to / from each of the input side accommodating portions 1a ′ to 1n ′ is reduced, and an increase in hardware scale can be suppressed. Further, since each selection unit 23 is arranged in the corresponding output-side accommodation unit 2a ′ to 2n ′, it is not necessary to prepare the maximum number of selection units 23 that can be expected, and the accommodation units actually mounted The hardware can be suppressed to a scale according to the number of copies.

Further, each input side accommodating portion 1a 'which is a request source
By providing a slot for each ~ 1n 'and inserting a transfer destination number indicating the output side accommodating portion 2a'-2n' of the transfer destination into these slots, the transfer source and the transfer destination are notified and recognized. Actually, only the transfer destination number is exchanged on each bus, the amount of information is reduced,
It becomes possible to perform faster exchange control, and it is possible to sufficiently cope with a large number of accommodations. Further, in each signal generation unit, the selector control signal is generated based on the transfer destination number inserted in the slot of the input side accommodation unit which is the transfer source on the transfer permission bus.
Since the signal generation unit is shared, it is not necessary to provide a signal generation unit corresponding to each selection unit, and it is possible to suppress an increase in hardware scale.

[0053]

As described above, according to the present invention, among the transfer requests output from the respective input side accommodating units, the switch control means for selecting any transfer request for each transfer request having the same transfer destination. Is provided to output the selector control signal based on the selected transfer request, and output the transfer permission to the transfer source. Based on the selector control signal, the selector switch means causes each input side of the transfer source. One to one accommodating section and output-side accommodating section serving as transfer destinations
Since the data output from the transfer source is transferred unidirectionally, the sharing of media between each input / output accommodating unit is eliminated, and the output transfer speed of each input side accommodating unit and each output side It is possible to increase the input transfer rate of the accommodation unit to the media transfer rate. Further, only one transfer request is selected for each output side accommodating section, and it becomes possible to suppress the occurrence of data discard inside the switch.

Furthermore, a selection unit is provided for each output side accommodating unit, the corresponding output side accommodating unit selects any one of the transfer requests as the transfer destination and outputs the transfer permission, and the signal generating unit A selector control signal is output based on the transfer permission output from each selection unit, and a selector unit provided for each output-side accommodation unit outputs the data from each input-side accommodation unit based on the selector control signal. Since any one of the above is selected as the data to be transferred to the corresponding output side accommodating section, it can be compared with a small amount of hardware,
Each output side accommodation part and either of each output side accommodation part,
It is possible to make a one-to-one connection via the corresponding selector.

Further, a transfer request bus for transferring the transfer request output from each input side accommodating section and a transfer permission bus for transferring the transfer permission output from each selecting section are provided, and time division is performed on these buses. Since the transfer request and the transfer permission are exchanged using the slot provided in, it is possible to reduce the number of signal lines input / output to / from each input side accommodating section and suppress an increase in hardware scale. Become.

Further, each slot is provided for each input side accommodating section which is a transfer source, and the transfer destination number indicating the output side accommodating section of the transfer destination is inserted into a predetermined slot in each input side accommodating section and each selecting section. By so doing, the transfer request and transfer permission are output, so the transfer source of the transfer request and transfer permission is recognized based on the time position of each slot, and the transfer destination number inserted in these slots is used. The transfer destination of the transfer request and transfer permission is recognized, and only the transfer destination number is actually exchanged on each bus, the amount of information is reduced, and faster exchange control is possible. Moreover, even if the number of accommodations becomes large, it becomes possible to cope with it sufficiently.

Further, since the respective selection parts are arranged in the corresponding output side accommodating parts, the selection parts are mounted only on the output side accommodating parts which are mounted as needed, and it is estimated in advance. It is not necessary to prepare as many selection units as possible, and the hardware can be suppressed to a scale according to the number of accommodation units actually mounted. Also, in each signal generation unit, the selector control signal is generated based on the transfer destination number inserted in the slot of the input side accommodation unit which is the transfer source on the transfer permission bus, so that the signal generation unit is common. As a result, it is not necessary to provide a signal generation unit corresponding to each selection unit, and it is possible to suppress an increase in hardware scale.

[Brief description of the drawings]

FIG. 1 is a block diagram of a data exchange switch according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a switch control unit.

FIG. 3 is a block diagram showing a select switch section.

FIG. 4 is a timing chart showing the operation of the data exchange switch.

FIG. 5 is a block diagram of a data exchange switch according to a second embodiment of the present invention.

FIG. 6 is a block diagram around a transfer request bus and a transfer permission bus.

FIG. 7 is a timing chart showing a transmission / reception operation of a transfer request and a transfer permission.

FIG. 8 is a block diagram showing an input control unit and a selection unit.

FIG. 9 is a block diagram showing a conventional data exchange switch.

[Explanation of symbols]

1a to 1n, 1a 'to 1b' ... Input side accommodating section, 11 ... Memory, 12 ... Data transfer section, 13, 13 '... Input control section, 2a to 2n, 2a' to 2n '... Output side accommodating section, 21
... data receiving section, 22 ... memory, 23 ... selection section, 3 ... switch control section, 31a-31b ... selection section, 32a-32
n ... Signal generation unit, 4 ... Selector switch unit, 41 ... Distribution unit, 42a to 4An ... Selector, 5 ... Transfer request, 5 '...
Transfer request bus, 5a'-5n '... Slot, 6 ... Transfer permission, 6' ... Transfer permission bus, 6a'-6n '... Slot,
7 ... Selector control signal, 8, 9 ... Data, 15 ... Control bus.

Claims (6)

[Claims] 1. A plurality of input side accommodating parts and an output side accommodating part, wherein data of an arbitrary length input to an arbitrary input side accommodating part is transferred to a predetermined output side accommodating part based on transfer destination information. In the data exchange switch for transfer, among the transfer requests output from the respective input side accommodating units, the output side accommodating unit serving as the transfer destination selects one of the transfer requests for each same transfer request and becomes the transfer destination. A switch that outputs a selector control signal for instructing to select data from the input side accommodating unit that is the transfer source as data to be transferred to the output side accommodating unit, and outputs a transfer permission to the input side accommodating unit of the transfer source. Based on the control means and the selector control signal from the switch control means, one of the data output from the respective input side accommodating sections is selected as the data to be transferred to the respective output side accommodating sections. As a result, each input side accommodating section and each output side accommodating section are connected in a one-to-one correspondence, and the data output from each input side accommodating section of the transfer source is output side as the transfer destination according to the transfer permission. A data exchange switch, characterized by comprising selector switch means for unidirectional transfer to a storage part. 2. The data exchange switch according to claim 1, wherein the switch control means is provided for each output side accommodating section, and the corresponding output side accommodating section selects any one of a plurality of transfer requests as transfer destinations. Then
A plurality of selection units that output transfer permission to the transfer source, and input-side accommodation that is the transfer source as data to be transferred to the output-side accommodation unit that is the transfer destination based on the transfer permission output from each selection unit A selector control unit that outputs a selector control signal for instructing to select data from each unit, and the selector switch means distributes the data output from each input-side accommodation unit to each output-side accommodation unit. Section, and each output side accommodating section, corresponding to the output side accommodating one of the data from each input side accommodating section distributed by the distributing section based on the selector control signal from the switch control means. A data exchange switch having a selector unit for selecting as data to be transferred to the unit. 3. The data exchange switch according to claim 2, further comprising a transfer request bus for transferring a transfer request output from each input side accommodation section, and a transfer permission bus for transferring a transfer permission output from each selection section. The data exchange switch is characterized in that a transfer request and a transfer permission are exchanged by using slots provided on these buses in a time division manner. 4. The data exchange switch according to claim 3, wherein each slot is provided for each input-side accommodating section that is a transfer source, and each input-side accommodating section has a transfer-destination output-side accommodating section in its own slot. The transfer request is output by inserting the transfer destination number indicating the transfer destination number, and each selection unit inserts the transfer destination number indicating the output side accommodation unit serving as the transfer destination into the slot of the input side accommodation unit serving as the transfer source. A data exchange switch characterized by outputting a transfer permission. 5. The data exchange switch according to claim 3, wherein each selection unit is arranged in a corresponding output side accommodation unit. 6. The data exchange switch according to claim 4, wherein each signal generation unit is based on a transfer destination number inserted from each selection unit into a slot of an input side accommodation unit which is a transfer source on the transfer permission bus. A data exchange switch characterized in that a selector control signal is generated by the switch.