JPH06187277A - Data transfer system - Google Patents

Abstract

PURPOSE:To provide a data transfer system which is capable of obtaining high throughput by simultaneously operating plural input/output devices, multiplexing data by a frame unit on a transmission line, transferring it and improving the use efficiency and the transmission speed of the transmission line. CONSTITUTION:This system is made the data transfer system between the channel device 21 and the input/output device of an input/output processor 2 within a data processor, an input/output controller controlling the input/output device is connected with the channel device by a bit serial interface and information is transferred by a frame form. The input/output processor 2 is provided with the channel device 21 having data buffers 211A to 211H. At the same time, when the number of usable data buffer is plural, a multiplexing is performed for data by a frame unit between each data buffer 211A to 211H and the input/output device, 4 discrimination is performed by the device address corresponding to the input/output device for each transmission frame and data transfer is performed with plural input/output devices at the same time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer system between a channel device and an input / output device of a data processing device, and more particularly, in a frame format data transfer by a serial interface using an optical fiber cable, by multiplexing the data transfer. The present invention relates to a technique effectively applied to a data transfer method capable of improving the use efficiency and the transmission speed of a transmission line.

[0002]

2. Description of the Related Art Conventionally, as a data transfer system between a channel device and an input / output device of a data processing device, there is a system for transferring data by a serial interface using an optical fiber cable or the like. Due to the progress of optical transmission technology, the transmission speed is increasing and the transmission distance is becoming longer.

Further, as this tendency progresses, the ratio of the time when information is actually put on the transmission line decreases, the ratio of the response waiting time between devices increases, and the use efficiency of the transmission line decreases. Then, there arises a problem that the improvement of the transmission rate does not directly lead to the improvement of the throughput.

In response to this problem, the transfer of the data portion itself does not take a response in frame units, and the effect of the signal delay time accompanying the extension of the transmission distance is sought by devising the transfer method. .

However, before and after the data transfer, it is necessary to exchange signal responses between the devices such as a command instruction, a response thereto, a data transfer end report, a new command instruction in response thereto, and this response waiting time. The percentage of the total occupied time of the transmission line cannot be ignored.

For example, in the conventional data transfer method, the time chart is as shown in FIG. 7, and in the channel device, after the data transfer to the input / output device i is completed, the status from the input / output control device is displayed. The method is such that data is transferred to the next input / output device j after waiting for reception.

A known example of the prior art related to this type of technology is, for example, "Enterprise Systems Archite".
cture / 390 ESCON I / O Interface '' Third Edition (Aug
ust, 1992) Technologies mentioned in the literature such as IBM Corporation are mentioned.

[0008]

However, in the prior art as described above, data can be transferred only between the channel device and one input / output device on the transmission line, and a single device is always available from the channel device. It can only send to I / O devices, so the efficiency of use of the transmission line is poor,
For this reason, the transmission speed that affects the throughput becomes a problem.

Therefore, an object of the present invention is to solve the problems of the improvement of the transmission rate due to the progress of the transmission technology in recent years and the decrease of the use efficiency of the transmission line due to the extension of the transmission distance, and to realize a plurality of input / output devices. It is an object of the present invention to provide a data transfer system which operates simultaneously, multiplexes and transfers data in units of frames on a transmission line, and can obtain high throughput by improving the use efficiency and transmission speed of the transmission line.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0011]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

That is, according to the data transfer system of the present invention, the channel device of the input / output processing device in the data processing device and the input / output control device which is connected to this channel device by the bit serial interface and which transfers information in a frame format. And a plurality of input / output devices controlled by the input / output control device, which is a data transfer method between a channel device and the input / output device, wherein a plurality of first input / output processing devices and a plurality of input / output control devices are provided respectively. Alternatively, a second data buffer is provided, and an address for identifying the input / output device number is provided for each frame between the channel device and the input / output control device, and whether the channel device can simultaneously operate the input / output devices is determined. A means for judging and storing this is provided.

Further, in addition to the first data buffer, the input / output processing device further includes a first correspondence means between the data buffer and the input / output device number, and a storage means for a channel command word for each data buffer. A first selection circuit for the data buffer is provided between the main storage device and the data buffer, and a second selection circuit for the data buffer is provided between the data buffer and the input / output interface.

In addition to the second data buffer, the input / output control device also has a second correspondence means between the data buffer and the input / output device number, command storage means for each data buffer, and input / output. A third selection circuit of the input / output device is provided between the device and the data buffer, and a fourth selection circuit of the data buffer is provided between the data buffer and the input / output interface.

In this case, the input / output processing device has a first
The data buffer and the second selection circuit are installed for each channel device.

After the link between the channel device and the input / output control device is established, the input / output control device reports to the channel device information on the data buffers usable by the input / output control device. .

Further, the information of the data buffer of the input / output control device which can be used for each input / output device is defined in advance in the sub-channel of the input / output processing device as the system configuration information.

[0018]

According to the above-mentioned data transfer method, the input / output processing device has a plurality of first data buffers, the input / output control device has a plurality of second data buffers, and each frame is provided between the channel device and the input / output control device. The address and the channel device are provided with means for judging / storing whether or not simultaneous operation is possible, so that the input / output processing device allocates one of the first data buffers to the input / output device at the time of command transmission, and ends the channel. The first data buffer is released after the status report is received, and the input / output control device allocates one of the second data buffers to the input / output device when the command is received, and the second data buffer is generated when the channel end status occurs. Can be opened.

If the channel device has only one input / output device that can operate simultaneously, data can be transferred to and from only one input / output device until the channel end condition occurs for one command. If there are two or more I / O devices that can operate simultaneously, the first
And the second data buffer can be multiplexed on a frame-by-frame basis, and can be identified by the address of each frame and data can be transferred simultaneously to a plurality of input / output devices.

That is, after the link between the channel device and the input / output control device is established, the input / output control device reports to the channel device the information on the data buffers usable by the input / output control device. Then, the channel device judges whether or not the input / output devices can operate simultaneously, and stores this, or the information of the data buffer of the input / output control device that can be used for each input / output device is input as the system configuration information. Since the sub-channel of the output processing device is defined in advance, the channel device can determine whether or not the input / output control device can multiplex the plurality of input / output devices frame by frame and transfer the data.

As a result, there is only one input / output device that can operate simultaneously.
In one case, data is transferred to only one input / output device until the end of channel condition occurs for one command. If one I / O device is transferring data with the channel device, no other I / O device can use this transmission line. It is kept waiting by the output control device. In this case, it is the same as the conventional data transfer method.

On the other hand, when there are two or more input / output devices which can be operated simultaneously, the operation is as follows. First, when a command is given from the channel device to the first input / output device, the channel device selects one from a plurality of data buffers according to the correspondence with the input / output device number and makes it correspond to the input / output device number. This data buffer transfers data to and from the main storage device according to the storage means of the channel command word.

Further, when the input / output control device receives the command, it selects one from the plurality of data buffers according to the correspondence means with the input / output device number and makes it correspond to the input / output device number. This data buffer transfers data with the input / output device according to the command storage means.

When an input / output command is issued to another second input / output device, the channel device determines whether the first input / output device and the second input / output device can operate simultaneously. If the simultaneous operation is not possible, the execution of this input / output command is entrusted to another channel device having a transmission path with the second input / output device, or waited in the input / output processing device.

If simultaneous operation is possible, a command is given from the channel device to the second input / output device, and the channel device selects one from a plurality of data buffers according to the correspondence with the input / output device number and inputs it. Corresponds to the output device number. This data buffer transfers data to and from the main storage device according to the storage means of the channel command word.

Further, when the input / output control device receives the command, it selects one from the plurality of data buffers according to the correspondence means with the input / output device number and makes it correspond to the input / output device number. This data buffer transfers data with the input / output device according to the command storage means.

Two data buffers are in use in the input / output processing device and are multiplexed by the selection circuit provided between the main storage device and the input / output interface. . At this time, the frames are multiplexed on the transmission path in frame units, and which input / output device is associated with the frame is identified by the device address in the frame.

Further, in the input / output control device, two data buffers are in use, and each data buffer selects one input / output device by the selection circuit provided between the input / output device and each data buffer. The two in-use data buffers are multiplexed by the I / O controller using the select circuit provided between the I / O interface.
Note that multiplexing of three or more input / output devices is performed in the same manner.

As a result, a plurality of input / output devices can be operated simultaneously, data can be multiplexed on a transmission line in frame units and transferred, and throughput can be improved by improving the use efficiency and transmission speed of the transmission line.

[0030]

Embodiment 1 FIG. 1 is a block diagram showing a data transfer system which is an embodiment of a data transfer system of the present invention, FIG. 2 is a block diagram showing in detail an input / output processing device in this embodiment, and FIG. FIG. 4 is a time chart of the data transfer system in the present embodiment.

First, the configuration of the data transfer system of this embodiment will be described with reference to FIG.

The data transfer system of this embodiment is, for example, a data transfer system between a channel device of a data processing device and an input / output device, and includes a main memory device (MS) 1 and a channel device connected to the main memory device 1. And an input / output processing unit (CU) 3 which is connected to a channel device of the input / output processing unit 2 by a bit serial interface and which transfers information in a frame format.
And the input / output device (D
E) 4 and.

The input / output processing device 2 includes, for example, 32 channel devices (CH0 to 31) 21 as shown in FIG. 2, and a selection circuit (MPX1) so that the main memory device 1 can access from each channel device 21. It is multiplexed by means of 22 and data can be transferred to the main memory 1.

Further, each channel device 21 has eight data buffers (CB0 to 7: first data buffer) 2
11A to 211H and the respective data buffers 211A to 21H
Channel command word storage means (CR0 to 0) every 1H
7) 212 and each of the data buffers 211A to 21A
1H is multiplexed by a selection circuit (MPX2: first selection circuit) 213 so that the main memory 1 can access it.

Further, the channel device 21 has a correspondence table (MAP0: first correspondence) between the respective data buffers 211A to 211H for storing the result of judgment as to whether or not the input / output devices 4 can operate simultaneously and the input / output device numbers. Means) 214, and each of the data buffers 211A to 211H has a selection circuit (MPX).
3: second selection circuit) 215, and through the serial / parallel conversion circuit (S / P) 216, by the optical signal transmitter (TRM) 217 and the optical signal receiver (RCV) 218 of the input / output interface in frame units. It is designed to transfer data.

The transmission frame 5 in the data transfer
The format is 16-bit input / output device 4 as shown in FIG.
In addition to the storage area of the device address 51 corresponding to, the storage areas of the control information 52 and the data 53 are provided. In this embodiment, the first 8 bits are always 0 and are not used.

Next, the operation of this embodiment will be described with reference to the correspondence table 214 with the input / output device numbers of the channel devices 21 in Table 1.

In this case, whether or not one input / output device 4 can use the one channel device 21 and the transmission path by multiplexing is determined by the information reported from the input / output control device 3 to the channel device 21. It is assumed that the input / output processing device 2 judges and stores this information in the correspondence table 214 of the channel device 21 and the input / output device number of the channel device 21.

[0039]

[Table 1]

First, when the link between the channel device 21 and the input / output control device 3 is established, the number of the data buffers 211A to 211H usable by the input / output control device 3 is reported from the input / output control device 3 to the channel device 21. It

For example, if the number of usable data buffers 211A to 211H of the input / output control device 3 is 0,
The input / output control device 3 cannot perform multiplex transfer in frame units. At this time, the channel device 21 sets the multiplex bit M of the input / output device number correspondence table 214 to 0 and does not issue a command to another input / output device 4 until the end of the channel for one command is reported.

On the other hand, assuming that the number of usable data buffers 211A to 211H of the input / output control device 3 is 4, the channel device 21 shows the input / output device number correspondence table 214.
Of the data buffers 211A to 211H of
When the multiple bit M of CB1, CB2, and CB3 is set to 1, for example, when a command is issued to the input / output device number 40, the data buffer (CB0) 211A is allocated, and the data buffer (CB0) 211A of the input / output device number correspondence table 214 is used. The middle bit B is set to 1 and the device number byte DN is set to 40.

Furthermore, when a command is issued to the input / output device number 45, the data buffer (CB1) 211B is allocated, the busy bit B of the data buffer (CB1) 211B in the input / output device number correspondence table 214 is set to 1, and the device number is set. Set byte DN to 45.

Then, when a command is issued to the input / output device number 44, the data buffer (CB2) 211C is allocated, the in-use bit B of the data buffer (CB2) 211C in the input / output device number correspondence table 214 is set to 1, and the device The number byte DN is set to 44. And input / output device number 4
When the input / output control device 3 reports that the control device is in use for the command No. 4, the data buffer (CB2) 211
The in-use bit B of C is set to 0.

Further, when a command is issued to the input / output device number 47, the data buffer (CB2) 211C is allocated, the busy bit B of the data buffer (CB2) 211C in the input / output device number correspondence table 214 is set to 1, and the device number is set. Set byte DN to 47. Then, the in-use bit B is set to 0 when the end of channel is reported from the input / output control device 3.

In this way, the channel device 21 allocates a new command to the data buffers 211A to 211H in which the multiplexed bit M is 1 and the in-use bit B is 0, and the frame on the interface and the data buffer 211A are allocated. .About.211H are made to correspond one-to-one with the device number bytes of the device address 51 and the input / output device number correspondence table 214 in the transmission frame 5, and are multiplexed as shown in FIG. 4, for example, to realize data transfer. be able to.

That is, in the channel device 21,
A command is transmitted to the input / output device i (for example, input / output device number 40), and the input / output control device 3 receives this command. Then, the input / output control device 3 transmits the status, and the data transfer is started after the channel device 21 receives this status.

At the same time, in parallel with this, a command is transmitted to the input / output device j (for example, the input / output device number 45), and after receiving the status from the input / output control device 3,
Data can be transferred between the channel device 21 and the input / output device j by being multiplexed with the input / output device i.

Therefore, according to the data transfer system of the present embodiment, the channel device 21 of the input / output processing device 2 is provided with a plurality of data buffers 211A to 211H so that the input / output control device 3 can be used for the channel device 21. The number of different data buffers 211A to 211H that can be used at the same time.
When the number of 1H is plural, each data buffer 211
A to 211H and the input / output device 4 can be multiplexed on a frame-by-frame basis, and can be identified by the device address 51 corresponding to the input / output device of each transmission frame 5, and data can be transferred simultaneously to a plurality of input / output devices 4. As a result, the usage efficiency of the transmission path can be improved and the transmission speed can be increased.

[0050]

Second Embodiment FIG. 5 is a block diagram showing a data transfer system which is another embodiment of the data transfer system of the present invention.

The data transfer system according to the present embodiment is similar to the first embodiment in that the main memory device (MS) 1 and the input / output processing device (I) in which the channel device connected to the main memory device 1 is built-in.
OP) 2, input / output control units (CU) 3A and 3B connected to the channel unit of the input / output processing unit 2 by a bit serial interface, and input / output units (DE) controlled by the input / output control units 3A and 3B. 4 and is different from the first embodiment in that one input / output device 4 multiplexes one channel device 21 and a transmission line and determines whether or not it can be used.

That is, the data buffer (CB) that can be used by each input / output device 4 is defined in advance in the sub-channel corresponding to each input / output device 4 as the configuration information together with the usable channel path, and based on this configuration information. The input / output processing device 2 determines the data buffer and the input / output device 4
And have been adapted.

For example, as shown in FIG. 5, eight input / output devices (input / output device numbers 40 to 47) are connected to two input / output control devices (CU0) 3A and (CU1) 3B, and input / output is performed. The control device 3A is connected to the channel device (CH0) 21A, and the input / output control device 3B is the channel device (CH3).
21D is connected. Then, the input / output control device 3
Both A and 3B have four data buffers (DB0 to 3) 3
1A to 31D, each of the data buffers 31A to 31D shares two input / output devices 4, and channel devices 21A to 31D.
4 data buffers (CB0-3) 211 for each 21D
A to 211D are provided.

In this case, the data buffers (CB0 to CB0) which can be used by the input / output device 4 of the input / output device numbers 40 and 44 are used.
3) 211A to 211D are channel devices (CH0) 2
1A data buffer (CB3) 211D and channel device (CH3) 21D data buffer (CB0) 211
Similarly, the input / output device numbers 41 and 45 are (CH
0) 21A (CB2) 211C and (CH3) 21D (CB1) 211B, input / output device numbers 42 and 46 are (C
H0) 21A (CB1) 211B and (CH3) 21D
(CB2) 211C, input / output device numbers 43 and 47 are (CH0) 21A (CB0) 211A and (CH3) 2
Each channel device 21A-2 of 1D (CB3) 211D
1D data buffers (CB0-3) 211A-211
D can be used.

Therefore, according to the data transfer system of the present embodiment, the data buffers (CB0 to 3) 211A used by the input / output processing device 2 in accordance with the subchannel configuration information.
~ 211D are determined, and this data buffer 211A ~ 2
If 11D is already in use, it can be controlled so as to wait for the command to be issued. Therefore, an extra control device busy report due to the use of the data buffers (DB0 to 3) 31A to 31D of the input / output control devices 3A and 3B. As described in the first embodiment, by multiplexing and transferring data, it is possible to improve the use efficiency of the transmission path and increase the transmission speed.

[0056]

Third Embodiment FIG. 6 is a block diagram showing in detail an input / output control device in a data transfer system which is another embodiment of the data transfer system of the present invention.

The data transfer system of the present embodiment is similar to the first embodiment in that the main memory device (MS) 1 and the input / output processing device (I) in which the channel device connected to the main memory device 1 is built-in.
OP) 2, an input / output control unit (CU) 3 which is connected to the channel unit of the input / output processing unit 2 by a bit serial interface, and which transfers information in a frame format, and an input / output controlled by the input / output control unit 3. The input / output control device 3 is provided with a plurality of data buffers and command storage means for each of the data buffers.

That is, the input / output control device 3 is provided with four data buffers (DB0 to DB3: second data buffer) 31A to 31D as shown in FIG. 6, and a command is issued to each of the data buffers 31A to 31D. Storage means (DR
0-DR3) 32, and each data buffer 31A-3
1D is a selection circuit (SL0 to 3: third selection circuit) 33A
33D to select one of the two input / output devices 4.

Then, the data buffer (DB0) 31A
Is shared by the input / output devices 4 of input / output device numbers 40 and 44, and similarly (DB1) 31B is input / output device numbers 41, 4
5 is shared, and (DB2) 31C is input / output device number 4
2 and 46 are shared, and (DB3) 31D is shared by the input / output device numbers 43 and 47.

Further, the input / output control device 3 has the above-mentioned data buffers 31A to 31D and the input / output device numbers 40 to 47.
Is provided with a correspondence table (MAP1: second correspondence means) 34, and each of the data buffers 31A to 31D has a selection circuit (M).
PX4: fourth selection circuit) 35, and through the serial / parallel conversion circuit (S / P) 36, by the optical signal transmitter (TRM) 37 and the optical signal receiver (RCV) 38 of the input / output interface in frame units. It is designed to transfer data.

Further, eight input / output devices 4 having input / output device numbers 40 to 47 are connected to the input / output control device 3.

Next, the operation of this embodiment will be described with reference to the input / output device number correspondence table 34 of the input / output control device 3 in Table 2.

This correspondence table 34 shows that the data buffers 31A to 31D of the input / output control device 3 and the input / output device number 40 to.
47 shows the correspondence with each of the data buffers 31A to 31A.
Each 31D is provided with an in-use bit B indicating whether or not the data buffer is in use.

[0064]

[Table 2]

For example, input / output device numbers 40, 41 and 4
6 of the I / O devices 4 are in use, and the I / O devices 4 of I / O device numbers 40 and 41 are the channel devices 2
1 and data is being transferred, and the input / output device 4 having the input / output device number 46 has completed the data transfer with the channel device 21, the value of the in-use bit B is the data buffer (DB0) 31A ( DB1) It is 1 in 31B,
It is 0 in (DB2) 31C and (DB3) 31D.

When the channel device issues a command to the input / output device number 44, the input / output control device 3 reports to the channel device 21 that the control device is in use. When a command is issued from the channel device 21 to the input / output device number 47, the input / output control device 3 causes the selection circuit (SL3) 33D to output the data buffer (DB3) 31.
Connect the input / output device number 47 to D, and set the in-use bit B of the data buffer 31D of the input / output device number correspondence table 34 to 1
Then, the availability of the input / output device is reported to the channel device 21.

Each of the data buffers 31A to 31D of the input / output control device 3 is selected by the selection circuit 35,
Data can be transferred in frame units through the input / output interface with the input / output processing device 2.

Therefore, according to the data transfer system of this embodiment, the input / output control device 3 is provided with a plurality of data buffers 31.
A to 31D and a command storage means 32 for each of the data buffers 31A to 31D, so that each of the data buffers 31A to 31D selects one from the two input / output devices 4 and simultaneously receives a plurality of inputs. Since data can be transferred to the output device 4, it is possible to improve the use efficiency of the transmission path and increase the transmission speed by data transfer by multiplexing as in the first and second embodiments.

Although the invention made by the present inventor has been specifically described based on the first to third embodiments, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the scope of the invention. It goes without saying that it can be changed.

For example, the data transfer system of the above-described embodiment has been described in the case of the system configuration shown in FIGS. 1, 2, 5, and 6, but the present invention is not limited to the above-mentioned embodiment. It goes without saying that various changes can be made to the number of channel devices, input / output control devices, input / output devices, channel devices and data buffers in the input / output control devices.

For example, although the case where the data buffer is provided for each channel device has been described in the first embodiment, it is also possible to equip the input / output processing device with this data buffer in common and share it with a plurality of channel devices. is there.

Further, in the above embodiment, the effect can be exhibited as the number of input / output devices controlled by one input / output control device increases, and a plurality of input / output devices can be arranged in an array. High throughput can be realized by accessing at the same time.

In the above description, the case where the invention made by the present inventor is mainly applied to a frame format data transfer system by a serial interface using an optical fiber cable, which is the field of use thereof, has been described, but the invention is not limited to this. However, the present invention is also widely applicable to other serial interface data transfer methods.

[0074]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.
It is as follows.

That is, the input / output processing device and the input / output control device are respectively provided with a plurality of first or second data buffers, and the input / output device number can be identified for each frame between the channel device and the input / output control device. Address, and by providing the channel device with means for deciding whether or not the input / output devices can operate simultaneously and storing the same, if one input / output device can operate simultaneously, one command 1 until the channel end condition occurs
When data is transferred only to one I / O device and two or more I / O devices that can operate simultaneously are multiplexed, the first and second data buffers that can operate simultaneously are multiplexed in frame units, and the address of each frame is added. Since it is possible to identify and simultaneously transfer data to a plurality of input / output devices, it is possible to improve the use efficiency of the transmission path and the throughput.

As a result, the effect of the present invention is improved as the transmission speed is improved and the transmission distance is lengthened by the progress of the transmission technology, and the number of input / output devices controlled by one input / output control device is increased. Can be demonstrated. In particular, by arranging a plurality of input / output devices in an array and accessing them simultaneously, it becomes possible to favorably apply to a system that realizes high throughput.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a data transfer system that is a first embodiment of a data transfer system of the present invention.

FIG. 2 is a block diagram showing in detail an input / output processing device according to the first embodiment.

FIG. 3 is a frame format diagram in data transfer in the first embodiment.

FIG. 4 is a time chart of the data transfer method in the first embodiment.

FIG. 5 is a configuration diagram showing a data transfer system that is Embodiment 2 of the data transfer system of the present invention.

FIG. 6 is a block diagram showing in detail an input / output control device in a data transfer system that is Embodiment 3 of the data transfer system of the present invention.

FIG. 7 is a time chart of a data transfer system in an example of a conventional technique.

[Explanation of symbols]

1 Main Storage Device 2 Input / Output Processing Device 3, 3A, 3B Input / Output Control Device 4 Input / Output Device 5 Transmission Frame 21, 21A-21D Channel Device 22 Selection Circuit 31A-31D Data Buffer (Second Data Buffer) 32 Storage Means 33A to 33D Selection circuit (third selection circuit) 34 Correspondence table (second correspondence means) 35 Selection circuit (fourth selection circuit) 36 Serial / parallel conversion circuit 37 Optical signal transmitter 38 Optical signal receiver 40 to 47 I / O device number 51 Device address 52 Control information 53 Data 211A to 211H Data buffer (first data buffer) 212 Storage means 213 Selection circuit (first selection circuit) 214 Correspondence table (first correspondence means) 215 selection Circuit (second selection circuit) 216 Serial / parallel conversion circuit 217 Optical signal transmitter 2 18 Optical signal receiver

Claims (5)

[Claims] 1. A channel device of an input / output processing device in a data processing device, an input / output control device which is connected to the channel device by a bit serial interface, and which transfers information in a frame format. A data transfer system between the channel device and the input / output device, wherein the input / output processing device and the input / output control device respectively include a plurality of first or second input / output devices to be controlled. A data buffer is provided, and the input / output processing device allocates one of the first data buffers to the input / output device at the time of command transmission, releases the first data buffer after receiving a channel end status report, and The entry output control device allocates one of the second data buffers to the input / output device when a command is accepted, and generates a channel end state. Then, the second data buffer is opened, and an address that can identify the input / output device number is provided for each frame between the channel device and the input / output control device. Is it possible for the channel device to simultaneously operate the input / output device? If there is one input / output device that can operate at the same time by deciding whether or not to store the data, only one input / output device and data transfer are performed until a channel end state occurs for one command. However, when there are two or more input / output devices that can operate simultaneously, the first and second data buffers that can operate at the same time are multiplexed in frame units, identified by the address of each frame, and simultaneously input into a plurality of input devices. A data transfer method characterized in that data is transferred to an output device. 2. The input / output processing device, in addition to the first data buffer, first correspondence means between the data buffer and the input / output device number, and storage means for storing a channel command word for each data buffer. And a first selection circuit of the data buffer between the main memory device and the data buffer, and a second selection circuit of the data buffer between the data buffer and the input / output interface. In addition to the second data buffer, second correspondence means between the data buffer and the input / output device number, command storage means for each data buffer, and a first input / output device between the input / output device and the data buffer. 3 selection circuit, and a fourth data buffer between the data buffer and the input / output interface.
2. The data transfer system according to claim 1, further comprising: 3. The data transfer system according to claim 2, wherein the first data buffer and the second selection circuit are installed in the input / output processing device for each channel device. 4. The information of the usable data buffer of the input / output control device is reported from the input / output control device to the channel device after the link between the channel device and the input / output control device is established. The data transfer method according to claim 2. 5. A sub-channel of the input / output processing device,
3. The data transfer method according to claim 2, wherein information on a data buffer of an input / output control device that can be used for each of the input / output devices is defined in advance as system configuration information.