JPH01156856A - Data transfer and control system - Google Patents

Abstract

PURPOSE:To shorten data transfer time by reading data out of a data holding area shown in a 1st field and then writing this data in each data holding area shown in a 2nd field by an extent equal to a data transfer value shown in a 3rd field. CONSTITUTION:Command words 11-15 are read and held before the transfer of data is started. Thus a data transfer controller 41 can know the data transfer value written in the data protection area of a device holding transmission data received from a 1st field of a command word, in the data holding area of a device holding reception data received from a 2nd field, and in the data holding area of a device holding the reception data from a 3rd field respectively before the transfer of data is started. Thus the controller 41 can read and hold the data transferred from the data holding area shown in the 1st field and write said data in each data holding area shown in the 2nd field by an extent equal to the data transfer value shown in the 3rd field.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transfer control system between a plurality of devices having means for internally retaining data.

[Conventional technology]

Examples of devices that have means for internally retaining data include central processing units and magnetic disk control devices, and conventional data transfer control devices that transfer data between multiple devices include data channel devices. . The data transfer control method using this data channel device is described in "D10 type private switching equipment, Part 8, Input/output equipment" edited by Japan Electric Power Corporation and published by Dentsu Electric Co., Ltd. ing.

The data transfer processing method in the data channel device (DCH) K will be explained below as an example.

FIG. 4 shows the structure of command words, modifier words, and command words between the central processing unit (Pi(,E)) and the DCH.

Reference numeral 21 is an instruction word of the start IO instruction executed by the PRE, which is composed of an OP field indicating an instruction code, and fields X2, b 2 , and d2 for calculating a qualified address. 22 is a modifier of the command word 21, and D
It consists of a channel address (CHA) field of C'H and an IO address (IOA) field of the device to which data is transferred. 25 is a command word 0 (CCWO) that specifies detailed operations of the DCH, and includes a command code (CMC) field that indicates input/output operation types such as read and write, and a flag (FLG) field that indicates operation variations such as chain commands. Consists of etc. 24 is a command word 1 (CCWl), and a word cocunta (WC) field indicating the number of data transfer words and a P゛几E
The data address (DA) field indicates the start address of the data holding area of the internal main memory (MM).

Above, command word 21, modification N22, command word 23 and 241
In the DCH data transfer control method by C, one star) IO instruction executes data transfer between the MM in the PRE and the device with one IOA.

Furthermore, if it is necessary to specify a data holding area within the IO device, another star) IO instruction is required.

[Problem that the invention seeks to solve]

Problems in the above conventional example will be explained using an example of the device configuration shown in FIG.

In FIG. 5, a central processing unit ft(P几E) 31 is composed of a central control unit (CC) 32 and a main memory (MM) 53, and is connected to a data channel unit (DCH) 35 via a processor path 34. Input/output devices (I OE ) 36, 37, and 38 are also connected to 1) CH 35 via an IO path 39.

Here, CC32 uses DCH35 and 10E5611
The data of the W word held in C is written as l0E57 and l0B.
Consider the case where data is transferred to 38.

As explained in the conventional example, in the busy, DCH&C data transfer control method, one start IO command is
Actual data transfer between M and one 108.

It is something that should be carried out. Therefore, first of all, CC32 is DCH35
The W word data held in l0E36 is transferred to MM35 using
transfer to. After this transfer is completed, the next 1CCC3
2 uses DCH35 to transfer data on MM55 to 10B
Transfer 57KW words. Finally, KCC32 uses DCH35 to transfer the data on MM35 in 10g5aKW words.

When performing data transfer between a plurality of 108s as described above, the data transfer processing method using the DCH has the following problems.

(1) Generally, in order to transfer data between N 108s, it is necessary to execute the star MO instruction N or more times. For this reason, the number of times to execute a star) IO instruction,
It is necessary to manage the order, execution interval, etc. with software, which places a large burden on the software.

(2) In the case of data transfer between multiple IOBs, the MMIC transfer data in the PRE that issued the start IO command must be saved, and the MM is used as the data transfer medium. Therefore, the larger the amount of data transferred, the larger the amount of data transfer medium on the MM is required.

(3) MM'f: Since it is used as a data transfer medium, the DCH requires data writing and reading processing to be performed on the MMK. For this reason, the number of times the path connecting the DCH and the MM is used, the usage time, and the accompanying voice transfer processing time increase.

The increase value increases as the amount of data transferred increases.

An object of the present invention is to reduce the burden on software when a data transfer control device processes data transfer between a plurality of devices, to avoid using a data transfer medium other than the data transfer control device, and to control data transfer. There is an urgent need to provide a data transfer control method that can minimize the amount of data transfer media in a device, minimize the number of paths used for data transfer, and shorten data transfer processing time.

[Means for solving problems]

The above purpose is to transmit a command word between a data transfer commanding device and a data transfer control device into a small number of fields (both the first field indicating the data holding area of the device in which sending data is held, and the receiving data It consists of a plurality of second fields indicating the data holding areas of the plurality of devices holding the data storage area, and a plurality of third fields indicating the amount of data to be transferred to each of the plurality of data holding areas indicated in the second field. , After the data transfer control device reads and holds the command word, reads and holds the data from the data holding area shown in the first field, and then transfers the read and held data to the data holding area shown in the second field. This is achieved by executing the process of writing to each of the data transfer amounts indicated in the third field.

[Effect]

The data transfer control device that receives the data transfer command reads and holds the command word before starting data transfer. For this reason, before starting data transfer, the data transfer control device transfers the data protection area of the device holding the transmitted data from the first field of the command word to the device holding the received data from the second field. From the third field, it is possible to know the amount of data transferred in each KW of the data holding area of the device that holds the received data.

From this K, the data transfer control device reads and holds the transfer data from the data holding area indicated in the first field, and then transfers the held data to each of the data holding areas indicated in the second field. 'The process of importing
Only the data transfer amount indicated in the third field can be executed.

As described above, the data transfer control device can transfer data between multiple devices with a single command, without using any data transfer medium other than the data transfer control device, and without using a data transfer medium certificate within the data transfer control device. Furthermore, the number of paths used for data transfer can be reduced, and the data transfer processing time can be shortened.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows the command word structure in this embodiment.

11 is the command word 0 (CCWo) and is the data transfer?
Command code (CM
C) field, a flag (FLG) field that indicates operation variations such as chain commands, and an address word counter (A) that indicates the number of areas that hold received data.
WC) field. 12 is the command i1 (
CCwl) and a device number 0 (NCO) field indicating the unique number of the device holding the transmitted data;
The data address 0 (DAO) field indicates the start address of the internal data holding area of the NCO. 13 is command word 2 (CCW2), and device number 1 (NC1) indicates the unique number of the device that holds the received data.
field, a data address 1 (DAl) field indicating the start address of the internal data holding area of the NC1, and a data word address 1 (WCl) field indicating the number of data words held in the DAIK. 1
4 is the command word 3 (CCW3), the structure is the same as CCW 2, and hereafter 15 command words 111 (CCVVfL+
The same applies up to 1).

FIG. 2K shows the configuration of the data transfer control device in this embodiment. The data transfer control device 41 includes a microprocessor (μPRC) 42, an internal memory (IM) 45 including R, OM, and R, AM, a first-in-first-out memory (FIFO) 44, and a path coupler A (BCA).
) 45, path coupler B (BCB) 46, and internal path 4
It consists of 7. μPRC42, IM43, and F
The IFO 44, HCA 45, and BCB 46 are connected by an internal path 47. Further, the BCA 45 is connected to an external path A 48, and the BCB 46 is connected to an external path B 49. BCA45 has internal path 47 and path A4
8, BCB 415 converts to internal path 47.
Bus conversion between the path B49 and path B49 is performed. μP box C42 receives hot water in response to a data transfer command from path A48 or path B89, and operates according to the program stored in IM45.

Now, the central processing unit (PRE) transfers the transmission data held in one device alK to n data holding areas K of multiple devices.
, consider the case where you want to transfer an arbitrary number of words from the beginning of the transmission data. However, it is assumed that the PRE and the plurality of devices are connected to either path A48 or path B49.

pRg, in the command word shown in FIG. 1, sets the 2o command indicating the data transfer type in the CMC field, and sets the number of received data holding areas 9 in the AWC field. Next, 1 transmitting device number is set in the NCO field, and the data holding area in the transmitting device is set in the DAO field.

Furthermore, one receiving device number is written in the NC1 field, and the data holding area t-DA1 field in this receiving device is written.
The number of data words to be transferred to this data holding area is set in the DWC1 field. The received data holding area of pond 9L-1 is similarly set. In this example, F
The LG field is a no-operation (NOP). PR, E stores these command words in the main memory t in PRE.
(MM) and then sends a data transfer command to the data transfer control device 41.

In the data transfer control device that received the data transfer command, μP
R, C42 is activated. The μP unit C42 operates according to the program held in the unit M43. An operational flowchart of this program is shown in FIG. The operation of the data transfer control device [41] will be explained below according to the operation flowchart of FIG.

The μPRC 42 that has been activated first reads c c w o an and CCWl (13) from the MM in the PRE.
Hold at M46. Next, after saving the contents of the AWC field of CCWoun to the area on the IM43 indicated by the label L, only the number indicated in the AWC field is read out from M M, and one after another FI)'044
(Here, write 1 to P I F' 044.
All of the CCWs written into 3F are CCW2 (13 or later) that indicate the received data holding area.
indicates the number of CCW words stored in the FIFO 44.

After reading all CCWs from MM, CCWO(
111 and branches to each command process. Since the CMC field now contains the 1o command, the process branches to fifl command processing.

If an L1 command is included, the process branches to L1 command processing.

1. When entering o command processing, the contents of La Persie are immediately set to 0.
Performs 0 judgment. If it is 0, it indicates that there is no CCW in the PIFO 44, so it is assumed that the 10 command processing has been completed, and completion reporting processing begins.

Now, since the content of label ↓ is 9 and not 0, CCW1
Read one word of the transmission data from the data holding area indicated in the DAO field of the device indicated in the NCO field of TJ2 IM4! After holding it at l, the contents of the DAO field are updated by +1. and I denoted by label j
Initialize the area on M43 to 0. Here, label j is the IM of the CCW that contains PIFOK at this point.
43 indicates the number of CCWs that have completed storing the transmitted data held in the received data holding area indicated by the CCW.

Next, the μPRC 42 reads one word of CCWA from the FIFO 44 and performs a 0 determination of the DWC field of CCWA. If it is not 0, after reading the transmission data held in the IM43 into the data holding area shown in the DAA field of the device shown in the NCA field of CCWA, the D
Update the contents of the AA field by +1 and further IcDW
Update the contents of the cA field by -1. Here, the 0 determination of the DWCA field is performed again. If it is not 0, the updated CCWA is written to PIF'044 again, and the contents of label j are updated by +1. To update label j, use F
Regarding the CCWA rewritten to the IFO 44, it means that the transmission data held in the IM 43 has been transferred at this point.

Of the two DWCA zero determinations conducted so far,
If 0 is detected in either one, the contents of label L are -
The process of updating CCWA by 1 and writing CCWA to the FIFO 44 again is not performed. In other words, all data transfer to CCWA has been completed, and from F'IFO44 to CC
This means that the WA has been deleted. Here, the initial 0 determination of DWCA is effective when PR and E are set to 0 from the beginning.

Next, the process of comparing and determining the content of label L and the content of label j is performed regardless of whether the content of DWCA is 0 or not. If they do not match, the FIFO 44
For all CCWKs included in IM43 at that time
This means that the transmission data held in
One word of CCW 4-4-1 is read from CCW 4-4-1 and the same processing as at CCWA 0 is performed. If both match, PIF04
IM4 at that time for all CCWs included in IM4.
This means that the transmission data held at 3 has been transferred. At this time, the μPnC 42 is busy transferring the second word transmission data by pressing the button to execute the same process again from the beginning of the io command process.

In this way, the μPnC 42 repeats the data transfer process until the existence of the label L becomes 0, thereby making it possible to process all the contents indicated by PR and E in the instruction word.

When all data transfer processing is completed, 1. uPRC
42 reports the completion of PL(, EK) and ends the operation.

According to this embodiment, there is an effect of making the next busy day easier.

(1) The burden on the software is reduced because data stored in one transmission data holding area can be transferred to a plurality of received data holding areas for any number of words with a single command.

(2) There is no need to have a data transfer medium other than the data transfer control device used for the above data transfer. Also, the data transfer medium within the data transfer control device requires only one word.

(3) Because the data transfer does not require any data transfer medium other than the data transfer control device, the data transfer control device can reduce the number of times the bus used for data transfer is
Usage time is reduced, and data transfer processing time is also reduced accordingly.

The embodiment described above is an example, and the number of transmission data holding areas to the number of reception data holding areas is 1:N, but multiple command words can be written by providing a chain command etc. in the FLG field of the command word. Continuous M-to-N data transfer is also easily possible.

In addition, in this embodiment, the number of transfer words to be transferred to multiple received data holding areas can be set to 5, respectively, but if the number of transferred words to be sent to all multiple received data holding areas is the same, the structure of command words and operation Although the flow can be made simpler, this is only a special example of this embodiment.

Furthermore, although this embodiment was a 1-to-N data transfer,
It is clear that control commands can also be easily transferred to the stand device.

Furthermore, in this embodiment, one word is read from the transmission data reception area and one word is written to each of a plurality of reception data areas, but it is also easily possible to transfer one word at a time instead of one word at a time. It is possible.

〔Effect of the invention〕

According to the present invention, data transfer of an arbitrary number of words between multiple devices can be executed with a single command, so the burden on software is reduced, and data transfer can be performed without using a data transfer medium other than the data transfer control device. It is economical because it minimizes the effort of the data transfer medium in the control device, and the number of times the bus is used for data transfer can be reduced, resulting in shorter path usage time and data transfer processing time. There are effects such as

[Brief explanation of the drawing]

FIG. 1 is a command word configuration diagram according to an embodiment of the present invention, and FIG. 2 is a data transfer control gcif to which the embodiment of the present invention is applied.
FIG. 3 is an operation flowchart of the data transfer control device shown in FIG. 2. FIG. 4 is a configuration diagram of conventional command words, modifier words, and command words. FIG. 5 is a conventional device configuration. It is a diagram. 11.12.13,14,15,23.24...command word, 21...command word, 22...modifier word, 31...
Central processing unit, 32... Central control unit, 33... Main storage device, 34... Processor path, 35... Data channel device, 56, 57.58... Input/output device,
41...Data transfer control device, 42...Microprocessor, 45...Internal memory, 44...FI
F O, 45, 415... Paskapura, 47, 48.
··path. No. / [ No. 2 @

Claims (1)

[Claims] 1. A plurality of devices each having means for internally retaining data;
a data transfer control device having means for internally holding data and transferring data between the plurality of devices, one of the plurality of devices creating a command word instructing a data transfer method between the other devices; By instructing the data transfer control device to transfer data after reading and holding the command word, the data transfer control device reads and holds the command word independently of the device that issued the command, and then reads and holds the command word and then transmits a plurality of data according to the instructions of the command word. In a system that transfers data between devices, the command word is divided into at least a first field indicating a data holding area of a device in which transmission data is held, and a first field indicating a data holding area of a plurality of devices holding transfer data. 2 fields and a third field indicating the amount of data to be transferred to each of the plurality of data holding areas indicated in the second field, and after the data transfer control device reads and holds the command word, The third step is a process of reading data from the data holding area shown in the first field and writing this data into each of the data holding areas shown in the second field.
A data transfer control method characterized by executing only the data transfer amount indicated in the field.