JP2003152813A - Data transmission apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data transmission apparatus that can apply queuing to received data in good order and complete reception processing without demanding complicated processing to a succeeding apparatus. SOLUTION: The data transmission apparatus is provided with: a storage device (3) to store received data when receiving data sent from a transmission station and gives the received data (100) to the succeeding apparatus (2); a plurality of queues (4A, 4B) that queue the received data, a plurality of queue pointers (51) that indicates the queued pointer address to the succeeding apparatus; a notice means (52) that informs the succeeding apparatus about the reception of the received data; a reply reception means (53) that receives a signal of indicating the completion of the received data by the succeeding apparatus; and a queue control means (54) that controls the queues.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device which receives data transmitted from a transmission station and transfers the received data to a next device.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a schematic configuration of a conventional data transmission apparatus of this type, and FIG. 5 is a block diagram showing a queue structure of this data transmission apparatus. In each of these drawings, the data transmission device 1 has a function of a reception station for a transmission station (not shown), receives data transmitted from the transmission station as reception data 100, and transfers it to the next device 2. The data transmission device 1 includes a data storage device 3, a queue 4, and a queue control device 5, stores received data 100 in the storage device 3, and further, with the next device 2, a data reception notification and a reception completion response. Is transmitted and received, and the next device 2 sequentially receives the reception data stored in the storage device 3.

Here, when storing in the storage device 3 via the queue 4, the queue pointer 5 of the queue control device 5
0 indicates the address of the reception descriptor corresponding to the reception buffer in which the reception data 100 should be stored next.
That is, as shown in FIG. 5, the reception descriptor 61
The reception data is stored in the reception buffer 31 by pointing to, and the reception data is stored in the reception buffer 32 by pointing to the reception descriptor 62. Then, the reception data corresponds to the reception buffer 33 in which data is to be stored next. It indicates the reception descriptor 63.

Therefore, when receiving the reception data 100 continuously, when one reception data is stored in the reception buffer, the "next pointer address" in the previous reception descriptor is rewritten to the address of the current reception descriptor. In this way, the reception descriptors chain in one queue one after another.

[0005]

In the above-mentioned conventional data transmission apparatus, the next apparatus 2 needs to store the queue pointer of the reception data to be processed next. This is because there is one queue and the queue pointer points to the address of the receive buffer of the storage device for the next reception. Therefore, the reception process of the next device 2 is inevitably complicated.

The present invention has been made in order to solve the above-mentioned problems, in which queuing of received data is performed in an orderly manner, and the receiving process is completed without requiring a complicated process to the next device. It is an object of the present invention to provide a data transmission device that enables the above.

[0007]

A data transmission apparatus according to the present invention, for example, prepares two queues to have two or more queue pointers, puts the first received data in the first queue, and While notifying the device of this queue pointer, and before the next device can process this received data,
When the next received data is received, the data is queued in the second queue one after another, and when the next device finishes processing the received data of the first queue, the second queue pointer is notified to the next device, and After that, when the received data is received, it is controlled so as to be queued in the first queue.

Therefore, in the invention according to claim 1, in a data transmission device that receives data transmitted from a transmitting station and transfers the received data to a next device, a storage device for storing the received data, and a received data Queue control that queues multiple queues, multiple queue pointers that indicate the addresses of queued receive descriptors, and queue control that stores received data in a queue that is not processed by the next device when received data is received Means, a response receiving means for receiving a completion signal from the next device when the next device has processed the received data, and a notifying means for notifying the next device of the queue pointer of the queue storing the received data when the completion signal is received. And are provided.

The invention according to claim 2 is the data transmission device according to claim 1, characterized in that the next device is a relay device for relaying between networks.

According to a third aspect of the present invention, in the data transmission apparatus according to the first aspect, the next device is a station device that functions as a reception processing unit.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the preferred embodiments shown in the drawings. FIG. 1 is a block diagram showing a schematic configuration of a data transmission device according to the present invention.
In the figure, the data transmission device 1A includes a storage device 3 for storing received data, queues 4A and 4B for queuing the received data 100, and a plurality of queue pointers indicating the queued pointer addresses to the next device 2. 51, notification means 52 for notifying the next device 2 that the reception data 100 has been received, and response reception means 5, queues 4A and 4B for receiving a signal that the next device 2 has processed the reception data of the queues 4A and 4B. And a queue control device 5A including a queue control means 54 for controlling the.

Regarding the operation of this embodiment configured as described above, the relationship among the queue pointer 51, the queues 4A and 4B, and the storage device 3, that is, FIG. 2 showing the queue structure, and the structure of the reception descriptor are shown. It will be described below also with reference to FIG.

First, when the received data 100 is received by the data transmission device 1A, the queue control means 54 stores the received data in the queue 4A, for example, while one of the queues 4A and 4B is not operating. At this time, as shown in FIG. 2, the queue pointer 511 points to the address of the reception descriptor 61 corresponding to the reception buffer 31, whereby the reception data is stored in the reception buffer 31. Furthermore, the queue pointer 511
Is a reception descriptor 6 that manages the reception buffer 31.
The busy bit is set in the busy flag 611 of 1.
This busy bit indicates that the received data is stored in the receiving buffer 31 managed by the receiving descriptor 61.

Next, when the storage of the received data in the reception buffer 31 is completed, the notification means 52 issues a reception notification to the next device 2 and, at the same time, transfers the stored address of the reception descriptor 61 as a queue pointer. .

The next device 2 examines the reception descriptor addressed by this queue pointer, and receives the data in the reception buffer 31 pointed to by the reception descriptor 61 having the busy bit set in the busy flag 611. When the next device 2 completes receiving the data, it resets its busy bit and looks up the next pointer address 612. If the value of the next pointer address 612 points to its own address, the queuing ends there. After that, a completion response is returned to the response receiving means 53.

When the received data 100 is received by one shot, the operation is performed as described above. On the other hand, when the reception data 100 is continuously received, it operates as follows.

First, when the reception data 100 is received by the data transmission device 1A, the queue control means 54 stores the reception data in the queue 4A, for example, while one of the queues 4A and 4B is not operating. At this time, the queue pointer 511 points to the address of the reception descriptor 61 corresponding to the reception buffer 31,
As a result, the received data is stored in the reception buffer 31. In addition, the queue pointer 511 is
Busy flag 6 of the reception descriptor 61 that manages 1
Set the busy bit to 11. This busy bit is the reception buffer 3 managed by the reception descriptor 61.
1 indicates that the received data is stored.

Next, when the storage of the received data in the reception buffer 31 is completed, the notification means 52 issues a reception notification to the next device 2 and, at the same time, transfers the stored address of the reception descriptor 61 as a queue pointer. .

At this time, if the received data 100 is received before the next device 2 completes the processing of the received data, the queue control means 54 is not operating (the next device 2).
Is not processing the received data. ) Store the received data in the queue 4B. At this time, the queue pointer 512
Is a reception descriptor 62 corresponding to the reception buffer 32.
The received data is stored in the reception buffer 32. In addition, the queue pointer 5
12 sets the busy bit in the busy flag 611 of the reception descriptor 62 that manages the reception buffer 32.

Further, when the received data is received, the received data is stored in the queue 4B in the same manner as described above. At this time, the queue pointer 512 points to the address of the reception descriptor 63 corresponding to the reception buffer 33, so that the reception data is received.
3 is stored. Further, the queue pointer 512 sets the busy bit in the busy flag 611 of the reception descriptor 63 that manages the reception buffer 33. afterwards,
Next pointer address 6 in the previous reception descriptor 62
Queuing is performed by switching the value of 12 to the address of the next reception descriptor 63. When the received data 100 is received after that, the same operation is performed,
Chain to Cue 4B one after another.

Here, when the next device 2 completes the processing on the reception data stored in the reception buffer 31 via the queue 4A and sends the completion response to the response receiving means 53, the queue is accumulated in the queue 4B. At the same time that the notification means 52 issues a reception notification to the next device 2, the stored address of the reception descriptor 62 is transferred as a queue pointer.

Therefore, the next device 2 examines the reception descriptor addressed by this queue pointer, and the reception buffer 3 indicated by the reception descriptor 62 in which the busy flag is set in the busy flag 611.
Receive the data in 1. When the next device 2 completes receiving the data, it resets its busy bit and looks up the next pointer address 612. Next pointer address 6
If the value of 12 points to your address, the queue ends there. After that, a completion response is returned to the response receiving means 53.

If the received data 100 is further received before the completion response is returned to the response receiving means 53,
This time, it is queued in the queue 4A and the same operation as described above is repeated.

Thus, according to the present embodiment, the queuing of the received data is performed in an orderly manner, and the receiving process can be completed without requesting a complicated process to the next device.

In the above embodiment, the completion response is returned to the queue control device 5A when the next device 2 accesses the storage device 3 and receives the received data, but the next device 2 is called a bridge or router. In the case of a relay device functioning as a transmission station, the reception data is transmitted to the transmission line when the reception notification is issued from the notification unit 52, and the reception data queued in the reception descriptor is transferred. At the stage when all the information has been transmitted, the response receiving means 53
The completion response should be returned to.

When the next device 2 is a station device that functions as a reception processing unit, the reception processing unit is connected to the host device, that is, the station device when the reception notification is issued from the notification unit 52. The reception data may be transferred to the specified device, and the completion response may be returned to the response receiving means 53 at the stage when all the reception data queued in the reception descriptor have been transferred.

Further, in the above embodiment, two queues 4A and 4B are provided to alternately queue, but three or more queues are provided so that these queues are sequentially queued alternately. It can also be configured.

[0028]

As is apparent from the above description, according to the present invention, queuing of received data is performed in an orderly manner, and the receiving process can be completed without requiring a complicated process to the next device. It is possible to provide a data transmission device that enables the above.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a data transmission device according to the present invention.

FIG. 2 is a diagram showing a queue structure for explaining the operation of the embodiment shown in FIG.

FIG. 3 is a diagram showing the structure of a descriptor for explaining the operation of the embodiment shown in FIG.

FIG. 4 is a block diagram showing a schematic configuration of a conventional data transmission device.

5 is a diagram showing a queue structure for explaining the operation of the data transmission device shown in FIG.

[Explanation of symbols]

1A data transmission device Secondary device 3 storage devices 4A, 4B cue 5A queue control device 51 cue pointer 52 notification means 53 Response receiving means 54 queue control means

Claims (3)

[Claims] 1. A data transmission device that receives data transmitted from a transmission station and transfers the received data to a next device, a storage device for storing the received data, and a plurality of storage devices for queuing the received data. A queue; a plurality of queue pointers indicating the addresses of queued reception descriptors; queue control means for storing the received data in a queue which is not processed by the next device when the received data is received; Response receiving means for receiving a completion signal from the next device that the data has been processed by the next device, and a notification for notifying the next device of a queue pointer of a queue storing the received data when the completion signal is received A data transmission device comprising: 2. The data transmission device according to claim 1, wherein the next device is a relay device that relays between networks. 3. The data transmission device according to claim 1, wherein the next device is a station device that functions as a reception processing unit.