JPH05342151A - Bus controller - Google Patents

Abstract

PURPOSE:To execute a data transfer at a high speed, and also, to improve the availability of a bus by providing plural transfer data processing means, and a data control part for managing them, and sending transfer data to the transfer data processing means which is not operating, from the data control part. CONSTITUTION:At the time of transferring data between an input/output controller 10 and plural peripheral equipments 11, 12, a data control part 3 refers to a state flag of every transfer data processing means 1, 2, and sends transfer data to the transfer data processing means 1, 2 which are not operating. The transfer data processing means 1, 2 which receive the data process the sent data, and also, set the state flag in the course of processing. When the data processing is finished and the transfer preparation is completed, it is informed to the data control part 3. The data control part 3 refers to the state flag of every transfer data processing means 1, 2, and when it is confirmed that the bus is not occupied by the other transfer data processing means 1 or 2, it is permitted to the transfer data processing means 1, 2 to output the data to the peripheral equipments 11, 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus controller,
In particular, it relates to a bus controller for data transfer between an input / output controller and peripheral devices.

[0002]

2. Description of the Related Art A conventional bus controller, which controls data transfer between an input / output controller and a plurality of peripheral devices, occupies the bus when a transfer data is received from the input / output controller and sends the data to a designated peripheral device. The bus was released when all the data was transferred. Further, when the transfer data is received from a certain peripheral device, the bus is similarly occupied, and the bus is released when all the data is transferred to the input / output control device.

That is, for example, as shown in FIG. 3, the second peripheral device 12 is in a standby state while data is being transferred between the input / output control device and the first peripheral device 11. Then, the input / output control device and the first peripheral device 11
When the data transfer between them is completed, the data transfer is started between the input / output control device and the second peripheral device 12, and the first peripheral device 11 is in the standby state during the data transfer.

[0004]

However, in the above-mentioned conventional example, when data is being transferred between the input / output control device and a peripheral device, the bus is not used until the data transfer is completed even if the bus is not actually used. However, there is an inconvenience that the data transfer with other peripheral devices cannot be performed until the previous data transfer is completed and the bus is released.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the inconvenience of the conventional example, and particularly in the data transfer between the input / output control device and the peripheral device, perform the data transfer at high speed and improve the bus utilization efficiency. It is to provide a bus control device capable of performing the above.

[0006]

Therefore, according to the present invention, a plurality of transfer data processing means for processing the transfer data between the input / output control device and the peripheral device and managing the processing status as a status flag, and these transfer data processing means. The data control unit controls the data transfer timing of each transfer data processing unit on the basis of the status flag of each processing unit. This is intended to achieve the above-mentioned object.

[0007]

When the input / output control device or the peripheral device outputs data, the data control unit refers to the status flag of each transfer data processing means and sends the data to the transfer data processing means which is not in operation. The transfer data processing means that has received the data processes the sent data and sets the status flag during processing. Then, the transfer data processing means notifies the data control unit when the data processing is completed and the transfer preparation is completed.

When the data control unit refers to the status flag of each transfer data processing unit and confirms that the bus is not occupied in the other transfer data processing unit, the data processed by the transfer data processing unit is processed. To output to the peripheral device.

Then, the transfer data processing means sets the status flag while the bus is occupied and outputs the data to the input / output control device or the peripheral device. The transfer data processing means resets the status flag of the transfer data processing means when the data transfer is completed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment shown in FIG. 1, a plurality of transfer data processing means 1 and 2 for processing the transfer data between the input / output control device 10 and the peripheral devices 11 and 12 and managing the processing status as a status flag, and these transfer data processing means. The data control unit 3 controls the data transfer timing of each transfer data processing unit 1 or 2 based on the status flag of each unit 1 or 2.

Here, the first transfer data processing means 1 and the second transfer data processing means 2 have the same configuration and perform the same operation.

The first transfer data processing means 1 is a first buffer 1 for storing transfer data with the input / output control device 10 and the first peripheral device 11 or the second peripheral device 12.
A, first data compression / expansion means 1B for compressing and expanding data, and data stored in the first buffer 1A sent to the first data compression / expansion means 1B and the first data compression / A first compression / decompression control section 1C for storing the result of compression / decompression by the decompression means 1B in the first buffer 1A, and data being processed by the first data compression / decompression means 1B for the first compression / A first storage unit 1D that temporarily stores the data via the expansion control unit 1C.

Further, the first compression / decompression control section 1C sets a first busy flag 1E when the transfer data is sent to the first buffer 1A, and the first data compression / decompression means 1B compresses / decompresses it. When the processed data is transferred and the first buffer 1A becomes empty, the first busy flag 1E is lowered. That is, when the first busy flag 1E is set, it means that the first transfer data processing means 1 cannot accept new data.

The first compression / decompression control section 1C controls the input / output control when the data from the peripheral device is decompressed by the first data compression / decompression means 1B and stored in the first buffer 1A. When the data from the device 10 is compressed by the first data compression / decompression means 1B and stored in the first buffer 1A, the first bus occupation flag 1F is set, and the data is transferred to the first buffer 1A. Is empty, the first bus occupation flag 1F is lowered. That is, when the first bus occupancy flag 1F is set, it means that the first transfer data processing means 1 is transferring data.

The second transfer data processing means 2 stores the transfer data of the input / output control device 10 and the first peripheral device 11 or the second peripheral device 12 in the second buffer 2.
A, second data compression / expansion means 2B for compressing and expanding data, and data stored in the second buffer 2A to the second data compression / expansion means 2B and second data compression A second compression / expansion control unit 2C for storing the compression / expansion result of the expansion / expansion means 2B in the second buffer 2A, and the data being processed by the second data compression / expansion means 2B to the second compression. A second storage unit 2D that temporarily stores the data via the expansion control unit 2C.

Further, the second compression / decompression control section 2C sets a second busy flag 2E when the transfer data is sent to the second buffer 2A, and the second data compression / decompression means 2B compresses / decompresses it. When the processed data is transferred and the second buffer 2A becomes empty, the second busy flag 2E is lowered. That is, when the second busy flag 2E is set, it means that the second transfer data processing means 2 cannot accept new data.

The second compression / decompression control unit 2C controls the input / output control when the data from the peripheral device is decompressed by the second data compression / decompression means 2B and stored in the second buffer 2A. When the data from the device 10 is compressed by the second data compression / decompression means 2B and stored in the second buffer 2A, the second bus occupation flag 2F is set, and the data is transferred to the second buffer 2A. Is empty, the second bus occupation flag 2F is lowered. That is, when the second bus occupation flag 2F is set, it means that the second transfer data processing means 2 is transferring data.

Next, the operation of this embodiment will be described. (1) When data is transferred from the input / output control device 10 to the first peripheral device 11 and the second peripheral device 12: Here, the first data and the third data are transferred to the first peripheral device 11.
First, the case of transferring the second data to the second peripheral device 12 will be described.

.. The input / output control device 10 outputs the first data.

[0020]. When confirming that the first busy flag 1D is not set, the data control unit 3 determines that the first transfer data processing means 1 is not in operation, selects the first transfer data processing means 1, and selects the first transfer data processing means 1. The first data is sent to the buffer 1A.

Here, the first compression / decompression control section 1C sets the first busy flag 1E.

Subsequently, the input / output control device 10 outputs the second data. The data control unit 3 determines that the first transfer data processing unit 1 is in operation because the first busy flag 1E is set, and selects the second transfer data processing unit 2 to select the second transfer data processing unit 2. The second data is sent to the buffer 2A.

Here, the second compression / decompression control section 2C sets the second busy flag 2E.

[0024]. The first compression / decompression controller 1C
The first data stored in the buffer 1A is sent to the first data compression / decompression means 1B to instruct the compression processing. The first data compression / decompression means 1B uses the first compression / decompression
Under the control of the expansion control unit 1C, the received first data is compressed and sent back to the first compression / expansion control unit 1C. The first compression / decompression control unit 1C sequentially stores the compressed data from the first data compression / decompression unit 1B in the first storage unit 1D, and the compression processing in the first data compression / decompression unit 1B is performed. Upon completion, the compressed data stored in the first storage unit 1D is transferred to the first buffer 1A.

Then, the first compression / decompression control section 1C is
The first bus occupation flag 1F is set.

.. When the data control unit 3 confirms that the second bus occupancy flag 2F is not set, it determines that the bus is released, and the data stored in the first buffer 1A is transferred to the first buffer 1A via the bus. Transfer to the peripheral device 11.

When the data transfer is completed, the first compression / decompression control section 1C lowers the first busy flag 1E and the first bus occupation flag 1F.

At this time, at the same time, the second compression / decompression control section 2C sends the second data stored in the second buffer 2A to the second data compression / decompression means 2B to instruct the compression process. To do. The second data compression / decompression means 2B is
Under the control of the second compression / decompression control unit 2C, the received second data is compressed and sent back to the second compression / decompression control unit 2C. The second compression / decompression control unit 2C sequentially stores the compressed data from the second data compression / decompression unit 2B in the second storage unit 2D, and the compression processing in the second data compression / decompression unit 2B is performed. When finished, the compressed data stored in the second storage unit 2D is transferred to the second buffer 2A.

Then, the second compression / decompression control section 2C is
The second bus occupation flag 2F is set.

Subsequently, the input / output control device 10 outputs the third data. Since the first busy flag 1E is not set, the data control unit 3 has the first transfer data processing means 1
Is determined not to be operating, and the first transfer data processing means 1
To send the third data to the first expanded data buffer 1A.

Here, the first compression / decompression control unit 1C sets the first busy flag 1E.

.. When confirming that the first bus occupation flag 1F is not set, the data control unit 3 determines that the bus is released, and transfers the second data stored in the second buffer 2A via the bus. Transfer to the second peripheral device 12.

When the data transfer is completed, the second compression / decompression control section 2C lowers the second busy flag 2E and the second bus occupation flag 2F.

The first compression / decompression control section 1C sends the third data stored in the first buffer 1A to the first data compression / decompression means 1B to instruct the compression process.
The first data compression / decompression unit 1B compresses the received third data under the control of the first compression / decompression control unit 1C and sends it back to the first compression / decompression control unit 1C. The first compression / decompression control unit 1C sequentially stores the compressed data from the first data compression / decompression unit 1B in the first storage unit 1D, and the compression processing in the first data compression / decompression unit 1B is performed. Upon completion, the compressed data stored in the first storage unit 1D is transferred to the first buffer 1A.

Then, the first compression / decompression control section 1C is
The first bus occupation flag 1F is set.

.. When confirming that the second bus occupancy flag 2F is not set, the data control unit 3 determines that the bus is released and sends the third data stored in the first buffer 1A via the bus. Transfer to the first peripheral device 11.

When the data transfer is completed, the first compression / decompression control section 1C lowers the first busy flag 1E and the first bus occupation flag 1F.

That is, as shown in FIG. 2, first the first
While the second transfer data processing means 1 is in compression processing, the second transfer data processing means 2 is on standby, but when the first transfer data processing means 1 is in transfer, the second transfer data processing means 2 is in compression processing. Will be inside. Then, when the first transfer data processing means 1 is in compression processing, the second transfer data processing means 2 is in transfer. Furthermore, when the first transfer data processing means 1 is in the middle of transfer, the second transfer data processing means 2 is in the standby state. In this way, in each transfer data processing means, transfer data compression and transfer are alternately performed.

(2) When data is transferred from the first peripheral device 11 and the second peripheral device 12 to the input / output control device 10: Here, the first data and the third data are the first peripheral device. 11 from the second data to the second peripheral device 12
The case of output from will be described.

.. The first peripheral device 11 outputs the first data.

.. When confirming that the first busy flag 1E is not set, the data control unit 3 determines that the first transfer data processing means 1 is not in operation, selects the first transfer data processing means 1, and selects the first transfer data processing means 1. The first data is stored in the buffer 1A.

Here, the first compression / decompression control unit 1C sets the first busy flag 1E.

Subsequently, the second peripheral device 12 outputs the second data. The data control unit 3 determines that the first transfer data processing unit 1 is in operation because the first busy flag 1E is set, and selects the second transfer data processing unit 2 to select the second transfer data processing unit 2. The second data is stored in the buffer 2A.

Here, the second compression / decompression control unit 2C sets the second busy flag 2E.

.. The first compression / decompression controller 1C
The first data stored in the buffer 1A is sent to the first data compression / decompression means 1B to instruct decompression processing. The first data compression / decompression means 1B uses the first compression / decompression
Under the control of the expansion controller 1C, the received first data is expanded and sent back to the first compression / expansion controller 1C. The first compression / decompression control unit 1C sequentially stores the decompressed data from the first data compression / decompression unit 1B in the first storage unit 1D, and the decompression processing by the first data compression / decompression unit 1B is performed. When finished, the expanded data stored in the first storage unit 1D is transferred to the first buffer 1A.

Then, the first compression / decompression control section 1C
The first bus occupation flag 1F is set.

.. When confirming that the second bus occupation flag 2F is not set, the data control unit 3 transfers the first data stored in the first buffer 1A to the input / output control device 10.

When the data transfer is completed, the first compression / decompression control section 1C lowers the first busy flag 1E and the first bus occupation flag 1F.

At this time, at the same time, the second compression / decompression control section 2C sends the second data stored in the second buffer 2A to the second data compression / decompression means 2B to instruct decompression processing. To do. The second data compression / decompression means 2B is
Under the control of the second compression / expansion controller 2C, the received second data is expanded and sent back to the second compression / expansion controller 2C. The second compression / decompression control unit 2C sequentially stores the decompressed data from the second data compression / decompression unit 2B in the second storage unit 2D, and the decompression processing by the second data compression / decompression unit 2B is performed. When completed, the expanded data stored in the second storage unit 2D is transferred to the second buffer 2A.

Then, the second compression / decompression control section 2C is
The second bus occupation flag 2F is set.

Subsequently, the first peripheral device 11 outputs the third data to the bus. The data control unit 3 determines that the first transfer data processing unit 1 is not in operation because the first busy flag 1D is not set, and selects the first transfer data processing unit 1 to store it in the first buffer 1A. The third data is stored.

Here, the first compression / decompression control unit 1C sets the first busy flag 1E.

.. When confirming that the first bus occupation flag 1F is not set, the data control unit 3 transfers the second data stored in the second expanded data buffer 2A to the input / output control device 10.

When the data transfer is completed, the second compression / decompression controller 2C lowers the second busy flag 2E and the second bus occupation flag 2F.

The first compression / decompression control section 1C sends the third data stored in the first buffer 1A to the first data compression / decompression means 1B to instruct decompression processing.
The first data compression / decompression unit 1B decompresses the received third data according to the control of the first compression / decompression control unit 1C and sends it back to the first compression / decompression control unit 1C. The first compression / decompression control unit 1C sequentially stores the decompressed data from the first data compression / decompression unit 1B in the first storage unit 1D, and the decompression processing by the first data compression / decompression unit 1B is performed. When finished, the expanded data stored in the first storage unit 1D is transferred to the first buffer 1A.

Then, the first compression / decompression controller 1C
The first bus occupation flag 1F is set.

.. When confirming that the second bus occupation flag 2F is not set, the data control unit 3 transfers the third data stored in the first buffer 1A to the input / output control device 10.

When the data transfer is completed, the first compression / decompression control section 1C lowers the first busy flag 1E and the first bus occupation flag 1F.

It is also possible to alternately perform data transfer from the input / output control device to the peripheral device and data transfer from the peripheral device to the input / output control device.

In this embodiment, the case where the number of peripheral devices is two has been described, but the present invention is not limited to this.

Further, in the present embodiment, the processing contents in the transfer data processing means are described as data compression and data expansion, but the present invention is not limited to this.

[0062]

Since the present invention is constructed and functions as described above, according to this, even when data transfer is performed between the input / output control device and a peripheral device, the input / output is performed by utilizing the idle time of the bus. (EN) Provided is an unprecedented excellent bus control device capable of transferring data between a control device and other peripheral devices, which enables high-speed data transfer and improves bus usage efficiency. You can

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a timing chart for explaining the operation of FIG.

FIG. 3 is a timing chart for explaining the operation of the conventional example.

[Explanation of symbols]

 1 1st transfer data processing means 1A 1st buffer 1B 1st data compression / expansion means 1C 1st compression / expansion control section 1D 1st storage section 1E 1st busy flag 1F 1st bus occupation flag 2 2nd transfer data processing means 2A 2nd buffer 2B 2nd data compression / decompression means 2C 2nd compression / decompression control section 2D 2nd storage section 2E 2nd busy flag 2F 2nd bus occupation flag 3 data Control unit 10 Input / output control device 11 First peripheral device 12 Second peripheral device

Claims (2)

[Claims] 1. A bus control device for controlling data transfer between an input / output control device and a plurality of peripheral devices, processing data transferred between the input / output control device and the peripheral device, and setting a processing status as a status flag. A bus control device equipped with a plurality of transfer data processing means to be managed and a data control section for controlling the data transfer timing of each transfer data processing means based on a status flag for each of these transfer data processing means. . 2. The transfer data processing means stores a buffer for storing transfer data of the input / output control device and the peripheral device, a data compression / decompression means for compressing and decompressing data, and a buffer stored in the buffer. Data to the data compression / decompression means, stores the compression / decompression result of the data compression / decompression means in the buffer, and manages the processing status as a status flag. The bus control device according to claim 1, wherein the bus control device is provided.