JP2000259540A - Device and method for transferring data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower overrun probability. SOLUTION: This device has a register 6 for storing reply data from a main storage device 2, a register 9 for storing these reply data, a register 8 for storing an operating instruction signal from a microprogram control part 5, a selector 12 for selecting one of registers 6, 8 and 9 and a priority discriminating circuit 11 for receiving a control signal from the microprogram control part 5 and generating a priority select signal and applying it to the selector 12. When the priority select signal is received, the operating instruction signal in the register 8 is selected and applied to a channel device 3 by the selector 12, afterwards, the reply data in the register 9 are selected and applied to the channel device 3, and otherwise, the reply data in the register 8 are selected and applied to the channel device 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer apparatus and method for using reply data from a main storage device as a channel device.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional data transfer apparatus. The data transfer device 101 is connected to a main storage device 102 and a plurality of channel devices 103. The data transfer device 101 is connected to the down data bus 1
04 are connected to a plurality of channel devices 103. The data transfer device 101 includes a microprogram control unit 105, a register 106, a BUSY flag 107, a register 108, a priority determination circuit 109, and a selector 11
0.

[0003] Reply data from the main storage device 102 is stored in a register 106 and sent to a channel device 103 via a selector 110 and a down data bus 104. When the microprogram control unit 105 issues an operation instruction signal to the channel device 103, the operation instruction signal is stored in the register 108 and the BUSY
The flag 107 is set to "1".

[0004] The priority determination circuit 109 is provided with a register 10
6 and the operation instruction signal of the register 108 conflict, the priority is given to the reply data and the selector 11
Give instructions to 0. Therefore, the operation instruction signal waits in the register 108 while the reply data is continuous. During the waiting, the BUSY flag 107 remains "1".

When the BUSY flag 107 is "1", that is, when the microprogram control unit 105 attempts to issue an operation instruction signal to a new channel device during waiting, the previous operation instruction signal is waited for in the register 108. Therefore, the microprogram control unit 105 suspends the execution of the microprogram until the operation instruction signal of the register 108 is sent to the selector 110 and the BUSY flag 107 is reset to “0”.

[0006]

However, in the conventional data transfer device, while the reply data is continuously transferred, the operation instruction signal to the channel device waits and the execution of the microprogram is also performed. Since the interruption is performed, there is a problem that the overrun probability increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data transfer apparatus and method capable of shortening the waiting time for an operation instruction and the interruption time of the execution of a microprogram and reducing the overrun probability according to the processing contents of the microprogram. is there.

[0008]

According to a first aspect of the present invention, there is provided a first reply data storage unit for temporarily storing reply data from a main storage device; Second reply data storage means for temporarily storing reply data in the reply data storage means,
Microprogram control means for controlling execution of the microprogram, operation instruction signal storage means for temporarily storing an operation instruction signal from the microprogram control means,
Selection means for selecting one of the reply data of the first and second reply data storage means and one of the operation instruction signals of the operation instruction signal storage means and applying the selected signal to the channel device; 1st, 2nd
And priority order determining means for generating and giving the third priority selection signal to the selection means, wherein the selection means selects the reply data in the first reply data storage means when receiving the first priority selection signal. To the channel device, to select the operation instruction signal in the operation instruction signal storage means when receiving the second priority selection signal, to apply the selected operation instruction signal to the channel device, and to receive the second priority selection signal when receiving the third priority selection signal. It is characterized in that reply data in the reply data storage means is selected and given to the channel device.

According to a second aspect of the present invention, there is provided a first reply data storage means for temporarily storing reply data from a main storage device, and a first reply data storage means for temporarily storing reply data in the first reply data storage means. A second reply data storage means, a microprogram control means for controlling the execution of the microprogram, an operation instruction signal storage means for temporarily storing an operation instruction signal from the microprogram control means, and first and second replies. Selecting means for selecting one of reply data of the data storage means and one of the operation instruction signals of the operation instruction signal storage means and applying the selected operation instruction signal to the channel device;
Priority determination means for receiving a control signal from the microprogram control means, generating a priority selection signal and providing the priority selection signal to the selection means, wherein the selection means receives an operation instruction signal from the operation instruction signal storage means when the priority selection signal is received. Selecting a signal and providing it to the channel device, and thereafter selecting and providing the reply data in the second reply data storage means to the channel device;
When the operation instruction signal of the operation instruction signal storage means and the reply data of the second reply data storage means are not selected, the reply data of the first reply data storage means is selected and given to the channel device.

According to a third aspect of the present invention, a first register for temporarily storing reply data from a main storage device;
A second register for temporarily storing reply data of the first register; a microprogram control unit for controlling execution of the microprogram; and a third register for temporarily storing an operation instruction signal from the microprogram control unit. A register, a selector for selecting one of the reply data of the first and second registers and an operation instruction signal of the third register and providing the selected signal to the channel device, and a priority selection signal receiving a control signal from the microprogram controller. And a priority determining means for generating and providing the selector to the selector, wherein the selector selects the operation instruction signal of the third register when receiving the priority selection signal, and supplies the selected operation instruction signal to the channel device. Is selected and given to the channel device. The operation instruction signal of the third register and the reply data of the second register are selected. Select the reply data of the first register when not selected, characterized in that applied to the channel device.

According to a fourth aspect of the present invention, the first reply data storage means for temporarily storing reply data from the main storage device, and the second reply data for temporarily storing reply data in the first reply data storage means. A second reply data storage means, a microprogram control means for controlling the execution of the microprogram, an operation instruction signal storage means for temporarily storing an operation instruction signal from the microprogram control means, and first and second replies. Selecting means for selecting one of reply data of the data storage means and one of the operation instruction signals of the operation instruction signal storage means and applying the selected operation instruction signal to the channel device;
In a data transfer method of a data transfer device, comprising: a priority determining unit that generates a first, a second, and a third priority selection signal in response to a control signal from a microprogram control unit and gives the first and second priority selection signals to the selection unit. Selecting the reply data in the first reply data storage means when receiving the first priority selection signal and providing the reply data to the channel device;
Selecting the operation instruction signal of the operation instruction signal storage means when the selection means receives the second priority selection signal and supplying the operation instruction signal to the channel device; and receiving the second priority selection signal when the selection means receives the third priority selection signal. Selecting the reply data from the data storage means and providing the selected reply data to the channel device.

According to a fifth aspect of the present invention, the first reply data storage means for temporarily storing reply data from the main storage device, and the second reply data for temporarily storing reply data in the first reply data storage means. A second reply data storage means, a microprogram control means for controlling the execution of the microprogram, an operation instruction signal storage means for temporarily storing an operation instruction signal from the microprogram control means, and first and second replies. Selecting means for selecting one of reply data of the data storage means and one of the operation instruction signals of the operation instruction signal storage means and applying the selected operation instruction signal to the channel device;
A priority determining means for generating a priority selection signal in response to a control signal from the microprogram control means and giving the priority selection signal to the selection means, wherein an operation instruction is issued when the selection means receives the priority selection signal. A step of selecting an operation instruction signal of the signal storage means and supplying the operation instruction signal to the channel device; a step of selecting the reply data of the second reply data storage means and supplying the reply data to the channel device after the step; Selecting the reply data of the first reply data storage means when the reply instruction data of the signal storage means and the reply data of the second reply data storage means are not selected, and providing the selected reply data to the channel device. I do.

According to a sixth aspect of the present invention, a first register for temporarily storing reply data from a main storage device;
A second register for temporarily storing reply data of the first register; a microprogram control unit for controlling execution of the microprogram; and a third register for temporarily storing an operation instruction signal from the microprogram control unit. A register, a selector for selecting one of the reply data of the first and second registers and an operation instruction signal of the third register and providing the selected signal to the channel device, and a priority selection signal receiving a control signal from the microprogram controller. A data transfer method for a data transfer device, comprising: a priority determining means for generating and giving to a selector; selecting, when a selector receives a priority selection signal, an operation instruction signal of a third register to give to a channel device; After the step, the selector selects the reply data of the second register and supplies it to the channel device. And selecting the reply data of the first register and providing it to the channel device when the selector has not selected the operation instruction signal of the third register and the reply data of the second register. I do.

[0014]

Next, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a data transfer device 1 according to one embodiment of the present invention is connected to a main storage device 2 and a plurality of channel devices 3.
The data transfer device 1 is connected to a plurality of channel devices 3 via a down data bus 4. Data transfer device 1
Is the microprogram controller 5, the register 6, and the BUS
Y flag 7, register 8, register 9, and operating flag 1
0, a priority determination circuit 11, a selector 12, and an operation type flag 13.

The register 6 is connected to the main storage device 2. BUSY flag 7, register 8, and operating flag 1
0 and the operation type flag 13 are connected to the microprogram control unit 5. The register 9 is connected to the register 6. The priority determination circuit 11 is connected to the register 6, the BUSY flag 7, the operating flag 10, and the operation type flag 13. The selector 12 is connected to the register 6
, A register 8 and a register 9. Also,
The selector 12 is connected to the plurality of channel devices 3 via the down data bus 4.

The memory request from each channel device 3 is prioritized by the data transfer device 1 via a path (not shown) and sent to the main storage device 2. The reply data from the main storage device 2 in response to the memory request is stored in the register 6 and then stored in the selector 12 and the register 9.
Sent to The register 9 always samples the value of the register 6. The selector 12 includes a priority determination circuit 11
, The operation instruction signal of the register 8 and the register 6
And one of the reply data in register 9
One of them is transmitted to the channel device 3.

The microprogram control unit 5 sets the operation type flag 13 to "0" or "1" according to the processing contents of the currently executing microprogram. When issuing an operation instruction signal to the channel device 3, the microprogram control unit 5 sets the BUSY flag 7 to “1” and stores the operation instruction signal in the register 8. The operation instruction signal stored in the register 8 is held in the register 8 until the register 8 is selected by the selector 12 and transmitted to the channel device 3. When the register 8 is selected by the selector 12 and an operation instruction signal is transmitted, the priority determination circuit 1
The instruction of 1 resets the BUSY flag 7 to "0".

The operating flag 10 indicates logic "1" while the microprogram controller 5 is executing the microprogram. When the BUSY flag 7 is “1” and the operation type flag is “0”, when the microprogram control unit 5 generates an operation instruction signal to a new channel device, the microprogram control unit 5 sets the operating flag 10 to “ON”. Reset to “0” to interrupt the execution of the microprogram.

When the reply data is stored in the register 6, the priority determination circuit 11 stores the operation instruction signal to the channel device 3 in the register 8, the BUSY flag 7 is “1”, and the operating flag 10 Is "1", the selector 12 selects the register 6 and sends the reply data of the register 6 to the channel device 3.

When the operating flag 10 is "0" and the operation type flag 13 is "1" in the case described above, the priority determining circuit 11 outputs the priority selection signal to the selector 1
2 and reset the BUSY flag 7 to "0". Upon receiving the priority selection signal from the priority determination circuit 11, the selector 12 selects the register 8 and sends an operation instruction signal of the register 8 to the channel device 3. B
The USY flag 7 indicates whether the register 7 has a valid operation instruction signal.

The microprogram control unit 5 has a BUSY
When the flag 7 is reset to "0", the execution of the microprogram is resumed, and the operating flag 10 is set to "1". The operating flag 10 indicates that the microprogram control unit 5 is executing the microprogram. Thereafter, the priority determination circuit 11 causes the selector 12 to select the register 9 and causes the reply data of the register 9 to be transmitted to the channel device 3.

Next, the operation of the data transfer device of FIG. 1 will be described. Reply data for a memory request from each channel device 3 to the main storage device 2 is sent from the main storage device 2 to the register 6. When the selector 12 does not receive the priority selection signal from the priority determination circuit 11 and there is reply data in the register 6, the operation instruction signal from the microprogram control unit 5 to the channel device 3 exists in the register 8. BUSY flag 7 is "0"
Is satisfied, the register 6 is selected and the reply data is transmitted to the channel device 3. When the selector 12 does not receive the priority selection signal from the priority determination circuit 11 and there is reply data in the register 6, the operation instruction signal is stored in the register 8, and the BUSY flag 7 is set to "1". When no operation instruction signal to the new channel device 3 is generated in the microprogram control unit 5 and the operating flag 10 is "1", the register 6 is selected and the reply data is transmitted to the channel device 3. 3 Further, the selector 12 is provided with the priority determination circuit 1
When reply data is stored in the register 6 when no priority selection signal is received from the register 1, the operation instruction signal is stored in the register 8, the BUSY flag 7 is “1”, and the microprogram control unit 5 In-operation flag 1 because an operation instruction signal to a new channel device 3 has been generated.
When 0 is “0” and the microprogram control unit 5 sets the operation type flag 13 to “0”, the register 6 is selected and reply data is sent to the channel device 3.

When reply data is continuously transmitted from the main storage device 2 to each channel device 3, the reply data is stored in the register 6 every clock. Therefore, during this time, an operation instruction signal from the microprogram control unit 5 to the channel device 3 is issued to the register 8 and the BU
Even if the SY flag 7 is set to "1", the selector 12
Since the reply data in the register 6 is high, the operation instruction signal waits in the register 8.

After issuing the operation instruction signal, the microprogram control unit 5 continues to execute the microinstruction. However, when the microprogram control unit 5 attempts to issue an operation instruction signal to a new channel device 3, the previous operation instruction is issued. When the BUSY flag 7 is "1" because a signal is waiting in the register 8, a new operation instruction signal cannot be issued. For this reason,
The microprogram control unit 5 resets the operating flag 10 to “0” to interrupt the execution of the microprogram.

The priority determination circuit 11 determines that the BUSY flag 7 is "1" and the operating flag 10 is "0",
When the operation type flag 13 becomes “1”,
A priority selection signal is applied to the selector 12 to cause the selector 12 to select the register 8 and reset the BUSY flag 7 to “0”. The operation instruction signal of the register 8 selected by the selector 12 is transmitted to the designated channel device 3 via the down data bus 4. At this time, the value of the register 6 that has not been selected is set in the register 9.
When the BUSY flag 7 is reset to "0", the microprogram control unit 5 sets the operating flag 10 to "1", resumes execution of the microprogram, and issues an operation instruction signal to the new channel device 3. Is issued to the register 8. The priority determination circuit 11 selects the register 8 and sends the operation instruction signal to the channel device 3, and then causes the selector 12 to select the reply data in the register 9 and send it to the channel device 3.

In the above embodiment of the present invention,
The priority determination circuit 11 and the selector 12 may be configured as follows. The priority determination circuit 11 stores the register 6
When there is no operation instruction signal from the microprogram controller 5 to the channel device 3 in the register 8 and the BUSY flag 7 is "0", the first priority selection signal is generated. To the selector 12. When there is reply data in the register 6, the operation instruction signal is stored in the register 8, the BUSY flag 7 is “1”, and the microprogram controller 5 No operation instruction signal has been generated, and the operating flag 1
When 0 is “1”, a first priority selection signal is generated and supplied to the selector 12. Further, the priority determination circuit 11
When the reply data is stored in the register 6, the operation instruction signal is stored in the register 8, the BUSY flag 7 is "1", and the microprogram control unit 5 generates an operation instruction signal to the new channel device 3. Therefore, when the operating flag 10 is set to “0” and the microprogram control unit 5 sets the operation type flag 13 to “0”, the first
Is generated and given to the selector 12. The selector 12 selects the reply data of the register 6 when receiving the first priority selection signal from the priority determination circuit 11 and sends it to the channel device 3.

The priority order determination circuit 11 has a BUSY
When the flag 7 is “1”, the operating flag 10 is “0”, and the operation type flag 13 is “1”, a second priority selection signal is generated and given to the selector 12. The selector 12 receives the second
When the priority selection signal is received, the register 8 is selected and an operation instruction signal is transmitted to the channel device 3. The priority determination circuit 11 generates a second priority selection signal, supplies the second priority selection signal to the selector 12, selects the register 8, sends an operation instruction signal to the channel device 3, and then generates a third priority selection signal. To the selector 12. When the selector 12 receives the third priority selection signal from the priority determination circuit 11, the selector 12 selects the reply data in the register 9 and
Send to

[0028]

According to the present invention, the interruption time of the execution of the microprogram and the waiting time for issuing the operation instruction signal can be shortened according to the processing contents of the microprogram, so that the overrun probability can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a data transfer device as one embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional data transfer device.

[Explanation of symbols]

 Reference Signs List 1 data transfer device 2 main storage device 3 channel device 4 down data bus 5 microprogram control unit 6 register 7 BUSY flag 8 register 9 register 10 operating flag 11 priority determination circuit 12 operation type flag

Claims (6)

[Claims] 1. A first reply data storage means for temporarily storing reply data from a main storage device, and a second reply data storage for temporarily storing reply data of the first reply data storage means. Means, microprogram control means for controlling execution of the microprogram, operation instruction signal storage means for temporarily storing an operation instruction signal from the microprogram control means, and first and second reply data storage means Selecting means for selecting one of the reply data and one of the operation instruction signals of the operation instruction signal storage means and supplying it to the channel device; and receiving first, second and third control signals from the microprogram control means. And priority order determining means for generating a priority selection signal and giving it to the selection means, wherein the selection means comprises: When receiving the selection signal, the first data selector selects the reply data of the first reply data storage means and supplies it to the channel device. When the second priority selection signal is received, selects the operation instruction signal of the operation instruction signal storage means. And transmitting the reply data in the second reply data storage means to the channel device when receiving the third priority selection signal. 2. A first reply data storage unit for temporarily storing reply data from a main storage device, and a second reply data storage unit for temporarily storing reply data of the first reply data storage unit. Means, microprogram control means for controlling execution of the microprogram, operation instruction signal storage means for temporarily storing an operation instruction signal from the microprogram control means, and first and second reply data storage means Selecting means for selecting one of the reply data and one of the operation instruction signals of the operation instruction signal storage means and supplying the selected operation instruction signal to the channel device; and receiving a control signal from the microprogram control means to generate a priority selection signal and perform the selection. Means for deciding priority given to the means, wherein the selecting means, when receiving the priority selection signal, Select operation instruction signal instructing signal storage means provided to the channel unit,
And after this, the reply data of the second reply data storage means is selected and given to the channel device, and the operation instruction signal of the operation instruction signal storage means and the reply data of the second reply data storage means are selected. A data transfer device for selecting the reply data in the first reply data storage means and supplying the selected reply data to the channel device when the reply data is not received. 3. A first register for temporarily storing reply data from a main storage device, a second register for temporarily storing reply data of the first register, and controlling execution of a microprogram. A third register that temporarily stores an operation instruction signal from the microprogram control unit; and a reply data of the first and second registers and an operation instruction signal of the third register. A selector for selecting one to be provided to the channel device; and priority determining means for receiving a control signal from the microprogram control unit, generating a priority selection signal, and providing the priority selection signal to the selector. When receiving a priority selection signal, selects an operation instruction signal of the third register and provides it to the channel device; and
Thereafter, the reply data of the second register is selected and supplied to the channel device, and when the operation instruction signal of the third register and the reply data of the second register are not selected, the reply of the first register is not selected. A data transfer device for selecting data and providing the selected data to the channel device. 4. A first reply data storing means for temporarily storing reply data from a main storage device, and a second reply data storing means for temporarily storing reply data of the first reply data storing means. Means, microprogram control means for controlling execution of the microprogram, operation instruction signal storage means for temporarily storing an operation instruction signal from the microprogram control means, and first and second reply data storage means Selecting means for selecting one of the reply data and one of the operation instruction signals of the operation instruction signal storage means and supplying it to the channel device; and receiving first, second and third control signals from the microprogram control means. A data transfer method for a data transfer device comprising: Selecting the reply data in the first reply data storage means and providing the reply data to the channel device when the selection means receives the first priority selection signal; Selecting an operation instruction signal of the operation instruction signal storage unit when receiving the selection signal and providing the operation instruction signal to the channel device; and storing the second reply data when the selection unit receives the third priority selection signal. Selecting and applying the reply data of the means to the channel device. 5. A first reply data storage means for temporarily storing reply data from a main storage device, and a second reply data storage for temporarily storing reply data of the first reply data storage means. Means, microprogram control means for controlling execution of the microprogram, operation instruction signal storage means for temporarily storing an operation instruction signal from the microprogram control means, and first and second reply data storage means Selecting means for selecting one of the reply data and one of the operation instruction signals of the operation instruction signal storage means and supplying the selected operation instruction signal to the channel device; and receiving a control signal from the microprogram control means to generate a priority selection signal and perform the selection. A data transfer method for a data transfer apparatus, comprising: Selecting the operation instruction signal of the operation instruction signal storage means when receiving the priority selection signal, and providing the selected operation instruction signal to the channel device; and after the step, the selection means sets the reply data of the second reply data storage means. And providing the channel data to the channel device; and selecting the first reply data when the selection means has not selected the operation instruction signal of the operation instruction signal storage means and the reply data of the second reply data storage means. Selecting the reply data in the storage means and providing the reply data to the channel device. 6. A first register for temporarily storing reply data from a main storage device, a second register for temporarily storing reply data of the first register, and controlling execution of a microprogram. A third register that temporarily stores an operation instruction signal from the microprogram control unit; and a reply data of the first and second registers and an operation instruction signal of the third register. A data transfer method for a data transfer device, comprising: a selector for selecting one of them and giving it to a channel device; and priority determining means for receiving a control signal from the microprogram control unit, generating a priority selection signal, and giving it to the selector. In the third aspect, when the selector receives the priority selection signal, the third
Selecting the operation instruction signal of the register of the second register and providing the signal to the channel device; and after the step, the selector selecting the reply data of the second register and supplying the reply data to the channel device; And selecting the reply data of the first register and applying it to the channel device when the operation instruction signal of the third register and the reply data of the second register are not selected. .