JPH1188464A - Data transfer device and data transfer method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten transfer time and to reduce the burden of line cost by indicating the storage pointer of a head packet emitting abnormality in a perti nent buffer at the time of abnormal reception. SOLUTION: A transfer control part 22 stores data in an idle transfer buffer 24, transfers it to a reception device and retransmits data after the indicated storage pointer in the transfer buffer 24 when the response of the abnormal reception of data is received. A transfer buffer control part 23 sets the transfer buffer 24 in an idle state when the response is normal reception, and indicates the pointer of the head packet of abnormal reception in the buffer 24 when the response of abnormal reception is received. A reception control part 26 makes the response of abnormal reception at the time of abnormal reception and stores data which is retransmitted after the indicated storage pointer in the corresponding reception buffer 28. A reception buffer control part 27 sets the reception buffer which is reception-processed in the idle state and indicates the storage pointer of the head packet of abnormal reception in the pertinent buffer 28 at the time of abnormal reception.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an improvement of a data transfer device. Financial institutions regularly copy and store the file data of the main center in the file device of the sub-center, but since a large amount of data is transferred to the sub-center via the line, it is necessary to improve the line utilization efficiency. Have been.

[0002]

2. Description of the Related Art FIG. 12 shows an example of a file transfer device.
FIG. 13 is a transfer time chart of a conventional example.

[0003] As a conventional example, a case where a file of a main center is copied to a file device of a sub center via a line will be described. FIG. 12 shows a configuration example of the main center 1 and the sub center 11. The main center 1 periodically sub-centers 11
And all data of the master file stored in the file device 7 of the main center 1
The sub center 11 receives the data, stores it in the file device 17, and stores it as a sub file.

Here, the file device 7 and the file device 17
Are composed of the same magnetic disk device, and file data is transferred in units of tracks, and each track data is divided into a plurality of packets and transferred. The transfer control is as follows.

In the main center 1, a central processing unit C
When a transfer command is issued from PU2, the file control unit 6
Reads the file data from the file device 7 on a track basis and stores it in the data buffer 3.

The transfer unit 4 reads out data for one track from the data buffer 3 and divides it into a predetermined packet size, and adds a header part storing data attributes such as a track number to the packet unit via the line control unit 5. Output to line 8.

[0007] In the sub-center 11 receiving this data through the line control device 14, the receiving unit 15 receives the data in a packet buffer storing data for one track (not shown), and
It verifies the normality of data reception for a track (eg, missing packets). When it is confirmed that the data has been received normally, the data is stored in the data buffer 13 and the normal reception is returned to the main center 1. Then, the file control unit 16 stores the data stored in the data buffer 13 in the corresponding track of the file device 17. If abnormal reception such as a missing packet is confirmed, the abnormal reception is responded.

On the other hand, the main center 1 waits for a response (answer packet) from the sub-center 11 every time data for one track is transferred, and transmits the next track data if the reception is normal. If the response is an abnormal reception, the data of one track for which the transfer has failed is retransmitted.

FIG. 13 shows a transfer time chart in a case where one track is divided into three packets.
After the transfer of the packet data (data for one track), a response Ans1 of the track data is waited. When the normal reception is notified, the next track data 2a to 2c is transferred, and when the abnormal reception is notified. For example, the track data of the abnormal reception is retransmitted.

FIG. 13 shows that track data 2a to 2c are Ans2
This indicates a case where abnormal reception has been notified, for example, even if only one packet data of the packet 2b is abnormal reception, all the track data 2a to 2c are retransmitted. When normal reception is confirmed by the response Ans2 'to this retransmission,
The next track data 3a to 3c is transmitted.

As described above, in the prior art, data has been sequentially transferred while confirming normal reception in each track.

[0012]

As described above, in the conventional file transfer, data is sequentially transferred while confirming normal reception in track units. However, since a response is waited for every track data transfer, In the full-duplex line, there is a problem that the line is not used during that time, and the line use efficiency is poor. Further, when there is a response to the abnormal reception, even if the transfer of only a certain packet fails, the data for one track is retransmitted, so that there is a problem that the retransmission time and thus the line use efficiency are wasted.

FIG. 13 shows this pattern. It takes 3T0 to output one track data (three packet data) to the line 8, and the response time is Ta (here, tentatively T0).
Then, it takes 4T0 for each track data transfer even if the data is normally received. When the transfer fails, one packet fails to transfer (the packet data 2 in FIG. 13).
b) Even in the case of retransmission, one track of retransmission time TR =
4T0 (including response) is required.

As described above, even in the normal transfer, the waiting time Ta for the response time is required for each track, and in the case of the transfer failure, the retransmission time 4T0 for one track is additionally required. Since the data volume of the master file is enormous and is copied regularly, there is a problem that the accumulation of the line non-use time is enormous and the cost cannot be ignored.

The present invention has been made in view of the above problems, and has as its object to provide a data transfer device that improves the line use efficiency in packet transfer.

[0016]

In order to solve the above-mentioned problems, a data transfer device according to the present invention is divided into packets from a transfer side device to a reception side device as shown in the principle diagram of the present invention in FIG. A data transfer device for transferring a plurality of data in a unit of the data, wherein the data transfer device is provided in the transfer side device and includes a plurality of sets of transfer buffers 24 and an empty transfer buffer.
The data is stored in the transfer buffer 24 and transferred to the receiving device, and when a response to the abnormal reception of the data is received from the receiving device, an instruction is issued from the transfer buffer 24 in which the data is stored. The transfer control unit 22 that retransmits the data after the storage pointer, and if the response from the receiving device is normal reception, sets the transfer buffer 24 storing the data to an empty state, and receives a response of abnormal reception. At this time, the transfer buffer control unit 23 for indicating the pointer of the abnormal reception first packet in the buffer 24, a plurality of sets of reception buffers 28 provided in the receiving side device, and the received data In the case of normal reception, the data receiving process is performed and normal reception is responded to the transfer side device, and in the case of abnormal reception, the abnormal reception is responded and the retransmission is performed by the transfer side device. A reception control unit 26 for storing data after a designated storage pointer in a corresponding reception buffer 28, and a reception buffer that has been subjected to the reception processing;
28 is set to an empty state, and in the case of the abnormal reception, a reception buffer control unit 27 for indicating a storage pointer of the abnormal reception leading packet in the corresponding buffer 28 is provided.

As described above, buffers for storing data in units of transfer are provided in the transfer-side device and the reception-side device, respectively, and the transfer data is stored in the buffer until normal transfer is confirmed. The normal transfer can be achieved only by retransmitting the data, and it is not necessary to retransmit all data in the transfer unit, so that the line efficiency is improved.

The transfer buffer 24 and the reception buffer
By providing a plurality of 28s, the next data can be transferred without waiting for a response, and especially in a full-duplex line, the response time can be greatly reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. Note that the same reference numerals represent the same object throughout the drawings.

FIG. 2 is a block diagram of a transfer section of the embodiment, FIG. 3 is a block diagram of a reception section of the embodiment, FIG. 4 is an explanatory view of a control flag, FIG. 5 is a flowchart of transfer processing (part 1) of the embodiment, and FIG. FIG. 7 is a flowchart of a transfer process (part 2) of the embodiment, FIG. 7 is a flowchart of a transfer process (part 3) of the embodiment, FIG. 8 is a flowchart of a reception process (part 1) of the embodiment, and FIG. FIG. 10 is a diagram illustrating a transfer time chart example, and FIG. 11 is a diagram illustrating a transfer time chart example of another embodiment.

As one embodiment of the present invention, a case is shown in which a file is copied via a full-duplex line in the same manner as in the conventional example, and an example is shown in which data is transferred in units of track data and divided into packets. Show.

FIG. 2 shows a transfer unit of the transfer-side device (primary center).
The portion excluding is a transfer unit corresponding to the transfer control unit 22 and the transfer buffer control unit 24 in FIG. In the data buffer 3, it is assumed that the track data is read from the file device, divided into packets, and stored in parallel with the data transfer. Of the stored track data, the track data to be transferred (usually in the order of a predetermined track number) is added to the ID adding circuit 43 by adding attributes such as a track number and a packet number for each packet to a plurality of pieces. One of the packet buffers 41 (TRACK0 to TRAC)
After being stored in K3), it is sent to the line controller 5 and output on the line. Here, reference numeral 31 denotes a buffer in which received data is temporarily stored. A packet ID decoder 32 detects whether or not the received data is a response (an answer packet in which a track number, missing information in the order of the packet number and the like are stored) from the receiving side device (sub center). . An answer buffer 33 stores received answer packets. 44 is an answer decoder, which is the first packet number of the missing packet notified by the answer packet (hereinafter, the first packet number of the missing packet, if normal, the first packet number of the track data, and so on)
Is detected and decoded.

AFW0 to AFW3 are packet buffers.
An answer weight flag corresponding to each of the buffers 41 (TRACK0 to TRACK3), indicating normal reception (no missing packets) output from the answer decoder 44
When the signal is reset (empty state) and the track data is transferred from the data buffer 3 to the packet buffer 41, the corresponding AFW is set. AFW0 to AFW
When the reset is performed, the selection signal SEL1 of the packet buffer-in control unit 34 that has analyzed the answer packet is selected.
When set, the selection signal output from the packet buffer / out controller 37 for controlling the transfer of the track data is set.
This is performed by SEL2.

PNRb0 to PNRb3 are TRACK0 to
In the packet number register corresponding to TRACK3, the decoder output of the answer decoder 44 is set to PNRb selected by the selection signal SEL1 output from the packet buffer in control unit 34, and the packet buffer out control unit
A pointer value based on the value of PNRb selected by the selection signal SEL2 of 37 is set in the output pointer 40.

The above is the processing part for the answer packet. A main control unit 35 controls the entire transfer control. Reference numeral 34 denotes a packet buffer in control unit. When data transfer is instructed from the main control unit 35, the next track data is read out from the data buffer 3, and the packet attributes such as track number and packet number are transmitted to the ID addition circuit 43. Is added to each packet, and an empty packet buffer (TRACK0 to TRACK3) in the packet buffer 41 is selected by the selector 39, an input pointer is set at the head of the packet buffer 41, and track data is stored. At this time, SEL1 is output to TRFA (Transfer Ready Flag) corresponding to the packet buffer 41 and selected, and "1" is selected.
Set to. Note that TRFA0 to TRFA3 are TRA
CK0 to TRACK3.

Reference numeral 36 denotes a track number management table, which is a correspondence table between TRACK0 to TRACK3 of the packet buffer 41 and the currently stored track data number (track number). It is referred to and referred to by the packet buffer out control unit 37.

Reference numeral 37 denotes a packet buffer out control unit.
When transfer data is stored in the packet buffer 41 and when retransmission is instructed, a pointer value based on the content of the corresponding PNRb is set in the output pointer 40, and the content of the packet buffer 41 based on the pointer value is line-controlled. Send it to device 5.

Reference numerals 39 and 42 denote selectors, TRACK0 to TRACK
Select one of ACK3. 38 is an input pointer,
The head address for storing the track data is set in the packet buffer 41. 40 is an output pointer, PNRb
The output pointer of the packet buffer 41 based on the value of is set.

The components relating to the transfer and retransmission of the track data have been described above. Hereinafter, the transfer control operation will be described with reference to FIG. 4 and FIGS. [Transfer-side operation] (1) Operation of packet buffer-in control unit FIG. 4A illustrates the control flag of the transfer side.
Fa is set to ON (TRFA = 1) when track data is stored in the corresponding packet buffer 41, and
Reset to off when transferred to the receiving side (TRFi = 0)
Is done. AFW = 1 (ON) indicates waiting for reception of an answer packet.

FIG. 5 shows a process of storing track data from the data buffer 3 to the packet buffer 41. The packet buffer-in control unit 34 detects an empty buffer among TRACK0 to TRACK3 of the packet buffer 41 based on whether or not there is one having TRFA = 0 and AFWa = 0. The track data to be stored is stored, TRFA corresponding to the buffer is set to ON, and the value of the output pointer (or corresponding value) is set to the corresponding PNRa (packet number register). In this case, the output pointer is the head address of the packet buffer 41.

As a result, TRFA = 1 and AWF = 0, indicating that the transfer to the receiving apparatus is waiting. Subsequently, it searches for another empty packet buffer 41, and if so, stores the next track data in that packet buffer 41,
Similarly, TRFA corresponding to the packet buffer 41 is set to ON, and an output pointer is set to PNRa.

FIG. 6 shows processing when an answer packet is received. When the answer packet is received, the track number in the answer packet is identified, and if the reception is normal, a reset signal is output from the answer decoder 44. Therefore, the packet buffer-in control unit 34 determines the AFW corresponding to the track number. Select and reset, and similarly reset the corresponding TRFA. As a result, the packet buffer 41 normally received is set to an empty state.

In the case of abnormal reception, the corresponding PNRa is selected and the decode output of the answer decoder 44 is set. This decoder output indicates the number of the first packet that is missing, is converted into the value of the output pointer at the time of retransmission, and is set in the output pointer 40. At this time, the AFW is also reset. As a result, TRFA = 1 and AWF = 0, and the transfer waits. However, the value of PNRb indicates the number of the first packet that has been lost, and waits for retransmission.

As described above, the packet buffer out control is performed as each buffer waits for the transfer. (2) Operation of Packet Buffer Out Control Unit The packet buffer out control unit 37 has TRFA = 1,
TRF checks if there is a packet buffer 41 with AWF = 0
a, AWF is searched and detected. If so, the contents of the packet buffer are transferred, and TRFA = 0, AFW = 1
(Wait for response).

The above operation is performed for all the devices for which TRFA is on. At this time, the value of PNRa is set as an output pointer, and data after the output pointer is output. In the case of retransmission, since the missing head packet number is set in PNRa, data is automatically retransmitted from the data of that packet number. In the transfer order, if necessary, the retransmission packet buffer 41 is recorded in the track number management table 36, and the transfer is preferentially performed. Or TRACK0-T
The data is cyclically transferred in the order of RACK3.

As described above, a plurality of packet buffers 41 are provided, the track data of which is stored until normal reception, and the data of the abnormally received track data after the missing first packet number are transmitted. Can be transferred continuously without waiting, and even in the case of abnormal reception, it is not necessary to transfer all track data, so that line efficiency is greatly improved. [Receiving Side Operation] FIG. 3 shows the structure of the receiving section of the receiving side apparatus (sub center). The receiving side has the same number of packet buffers 65 (TRACK0 to TRACK3) as the transferring side, 65 shows a configuration in which the content of No. 65 is saved, and when data is retransmitted due to abnormal reception, data after the missing leading packet number is rewritten with the retransmitted data.

In FIG. 3, the parts other than the line controller 14 and the data buffer 13 are receivers corresponding to the reception controller 26 and the reception buffer controller 27 in FIG. The track data received by the line controller 14 is stored in the buffer 5
1. TRACK via ID removal circuit 61 and selector 62
0 to TRACK3, only the track data temporarily stored in the empty packet buffer 65 and determined to be normal reception by the abnormal reception (packet loss) detection unit including the comparison unit 55 is transmitted to the packet buffer out control unit. 68
Is stored in the data buffer 13. The stored track data is stored in the file device in the order of tracks by a file control unit (not shown).

In this embodiment, an example is shown in which a track number is added to the header portion of each packet, and the track number is not removed by the ID removing circuit 61 but is stored in the packet buffer 65. Thereby, the data buffer 13 is transferred in the transfer order.
And the data is stored in the data buffer 13 in the order in which the track data is normally arranged. Then, the file control unit arranges the data in the order of the track numbers and copies the data to the file device.

In FIG. 3, reference numeral 51 denotes a buffer in which received data is temporarily stored. A packet ID decoder 52 decodes the head portion of the received data (in which a track number, a packet number and the like are stored).

Reference numeral 53 denotes a packet counter which counts the number of packets of the received track data and outputs the count every time. At that time, the value of the corresponding PNRb among PNRb0 to PNRb3 is preset. PNRb
Correspond to TRACK0 to TRACK3 of the packet buffer 65. The PNRb stores the number of the first packet among the missing packets (missing first packet number) as will be described later. Count. 54 is a packet number decoder,
Outputs the received packet number for each packet.

Reference numeral 55 denotes a comparing unit which compares the output of the packet counter 53 with the output of the packet number decoder 54, and outputs a mismatch signal if they do not match. If a certain packet is missing from the received track data, the next packet number is output, so that the value does not match the value of the packet counter 53, and the value of the packet counter 53 becomes the missing packet number. The same applies when the packet ID cannot be read. For this reason, the value of the packet counter 53 is set to PNRb by the output of the mismatch signal. In order to save the missing head packet number, the setting is prohibited until the next track data is received, or the comparison unit 55 outputs only the first mismatch signal, and sets only the head missing packet number. The PNRb to be set is selected by the packet buffer-in control unit 58 based on the track number notified from the packet ID decoder 52. In the case of normal reception, all 0s are stored. As described above, the missing head packet number can be detected by a simple circuit.

Reference numeral 56 denotes an OR circuit OR, which receives a time-out signal for reception and a normal reception signal (NORMAL END) in addition to a non-coincidence signal (error signal) of the comparison unit 55 and stores them in an answer buffer 57, and a response unit 71 , And is returned to the transfer side through the line controller 14.

The components of the response process on the receiving side have been described above. Reference numeral 67 denotes a main control unit which controls the entire reception. 58
Is a packet buffer-in control unit which controls and monitors the track number of received data, the control flag TRFb (transfer ready flag), BWF (buffer ready flag), PNRb (packet number register), etc. Transfer the received track data to TRACK0-T
T of the packet buffer 65 composed of RACK3
The TRACK of RFb = 0 and BWF = 0 is selected, stored at the address after the address indicated by the input pointer 64, and the TRFb is set to ON. In addition, PNRb
As described above, the missing start packet number and the start packet number (in the case of normal reception and empty) are set, and a pointer value corresponding to these values is set in the input pointer 64.

TRFb0 to TRFb3 and BWF0
BWF3 are the TRACs of the packet buffer 65, respectively.
Control flags corresponding to K0 to TRACK3, as shown in FIG.
The use status of TRACK0 to TRACK3 is indicated by a combination of set / reset states as shown in FIG. That is, the packet buffer 65 with TRFb = 0 and BWF = 0
Indicates an empty state, and stores newly received track data. Packet buffer with TRFb = 1 and BWF = 0
Numeral 65 indicates that the packet buffer 65 is being received, and upon completion of the reception, TRFb = 1 and BWF = 1 are set. In this state, the packet buffer 65 waits for a check by the main control unit 67. When receiving the notification of the normal reception from the response unit 71, the main control unit 67 turns off the corresponding TRFb. TRFb = 0, BW
The packet buffer 65 with F = 1 is transferred to the data buffer 13 by the packet buffer out controller 68 in a state of waiting for transfer to the data buffer 13. TRF upon transfer completion
b = 0 and BWF = 0 are reset. In the case of abnormal reception, retransmission is waited with TRFb = 1 and BWF = 0.

Reference numeral 60 denotes a track number management table, in which the comparison between the received track data number and TRACK0 to TRACK3 is managed by the packet buffer in control unit 58. A timer 59 counts the next packet reception time and outputs a timeout. Reference numeral 61 denotes an ID removing circuit which removes attribute data other than a track number from a header portion provided for each packet. Reference numeral 62 denotes a selector, which is driven by a select signal of the packet buffer
TR according to the received data among CK0 to TRACK3
Select ACK.

Reference numeral 68 denotes a packet buffer out control unit.
The selector 66 selects the TRACK of TRFb = 0 and BWF = 1 by controlling the selector 66, and transfers the contents to the data buffer 13 while controlling the output pointer 63. When the transfer completion is confirmed, BWF = 0 is set.

The above is a description of the processing for transferring and retransmitting track data to the packet buffer 65 and the data buffer.
This is a configuration part relating to the transfer processing to 13. Hereinafter, FIG.
The reception control operation will be described with reference to FIG. (1) Packet buffer in control The track number of the received data is determined, and the track number management table 60 is referred to.

If there is no corresponding track number, it is determined that the reception is new, the packet buffer 65 of TRACK of TRFb = 0 and BWF = 0 is selected, and the pointer value based on the corresponding PNRb is set in the input pointer 64. TRA
CK0 to TRACK3 are selected, the track data is stored, and registered in the track number management table 60. After that, the corresponding PNRb is selected by the selector 69, and the missing leading packet number based on the result of the comparing unit 55 (the leading packet number in a normal state) is set.

If there is a track number of the received data in the track number management table 60, retransmission is performed. Therefore, the corresponding PNRb is selected, an input pointer is set, the corresponding TRACK is selected, and the track data is written. Then, the PNRb
Is selected, and the value of the packet counter 53 is set based on the result of the comparing unit 55.

Thus, the writing of the new data and the retransmission data in the packet buffer 65 is completed. A response indicating whether the received track data is correct is output from the response unit 71. (2) Packet buffer out control The main control unit 67 monitors the contents of TRFb and BWF,
When a track of Fb = 1 and BWF = 1 occurs, the packet buffer out control unit 68 is instructed. As a result, the packet buffer out control unit 68 outputs the output pointer 63
Of the selected TRA from TRACK0 to TRACK3
CK is set at the head, and the selector 66 is controlled to read the corresponding track data and store it in the data buffer 13.
After completion, BWF = 0 is set.

As described above, normally received data is continuously received in the packet buffer 65, and in the case of abnormal reception, data from the head of the transfer failure packet can be received and stored.

As described above, the transmitting side and the receiving side transmit and receive in cooperation with each other, so that the transmitting side can continuously transfer the track data in the case of full-duplex communication, and fails in the case of abnormal reception. Only the data after the packet can be retransmitted and sent, and the receiving side receives the data in response to this, so that the line efficiency is improved.

FIG. 10 shows an example of a transfer time chart in a case where one track data is divided into three packets. If it takes T0 time to transfer one packet and T0 time to respond, (Normal reception) As shown in 1), it takes 10T0 time to transfer three track data. In the conventional example, as shown in FIG. 13, it takes 12T0 to transfer three track data, and in this example, 2T0
Can be shortened.

On the other hand, in the case of packet transfer failure, FIG.
As shown in (2), it takes one to transfer three track data.
In contrast to 2T0, FIG. 13 takes 16T0,
4T0 can be reduced. (Other Embodiments) TRACK0 to TRACK on the transfer side
3 units, and the receiving side is TRACK0-TRACK3
Is transferred to the data buffer when all are received normally. And the transfer side is TRACK0-TRAC
When all the responses of K3 become normal, the data of the next four tracks is transferred.

In this way, the receiving side can store the data in the data buffer 13 in the order of the track number, remove the track number by the ID removing circuit, and arrange the data in the data buffer 13 in the track order. Since the data is transferred, the writing process to the file device is shortened.

FIG. 11 shows a transfer time chart in this case. It takes 13T0 (16T0 in the conventional example) to transmit four tracks, and if it fails as shown in FIG.
It takes 16T0 to send 4 tracks. 20T in the conventional example
Since it is 0, it has been improved.

Calculation of the case of transferring four tracks in the above-described embodiment shows that 13T0 when normal, and 13T0 when abnormal.
15T0, and the above-described embodiment is superior. As mentioned above,
When packet data transfer is performed by full-duplex communication, multiple packet buffers are provided on both the transfer side and the receiving side, and when the packet buffer is empty, transfer is performed continuously without waiting for a response, In this case, since the entire track data is not transmitted, but is transmitted from the head of the failed packet, the transfer time can be reduced. As a result, the transfer cost is reduced because the line use time is reduced.

In the present invention, the packet buffer is set to 1
In the conventional example, instead of retransmitting all the tracks, the case where the transfer is performed from the missing head packet number is also included. As a result, even in half-duplex communication, when the number of packets is large,
The line efficiency can be greatly improved.

[0059]

As described above, according to the present invention, when performing packet transfer in full-duplex communication, a plurality of packet buffers are provided on both the transfer side and the reception side, and a response is made when the packet buffer is empty. Data is transferred continuously without waiting, and if a packet transfer failure response is received, the entire data is not retransmitted, but the data after the failed packet is read out from the packet buffer and transmitted. This has the effect of shortening the time and reducing the burden on the line cost.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a configuration diagram of a transfer unit according to the embodiment;

FIG. 3 is a configuration diagram of a receiving unit according to an embodiment;

FIG. 4 is an explanatory diagram of a control flag.

FIG. 5 is a flowchart of a transfer process (part 1) according to the embodiment;

FIG. 6 is a flowchart of a transfer process (part 2) according to the embodiment;

FIG. 7 is a flowchart of a transfer process (part 3) according to the embodiment;

FIG. 8 is a flowchart of a receiving process (part 1) according to the embodiment;

FIG. 9 is a flowchart of reception processing (part 2) according to the embodiment;

FIG. 10 is a diagram showing an example of a transfer time chart.

FIG. 11 is a diagram illustrating an example of a transfer time chart according to another embodiment.

FIG. 12 is a diagram illustrating an example of a file transfer device.

FIG. 13 is a transfer time chart of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main center 2 Central processing unit CPU 3 Data buffer 4 Transfer part 5 Line control device 6 File control part 7 File device 11 Sub-center 12 Central processing unit 13 Data buffer 14 Line control device 15 Receiving part 16 File control part 17 File device 22 Transfer controller 23 transfer buffer controller 24 transfer buffer 26 reception controller 27 reception buffer controller 28 reception buffer 31 buffer 32 packet I
D decoder 33 Answer buffer 34 Packet buffer in control unit 35 Main control unit 36 Track number management table 37 Packet buffer out control unit 38 Input pointer 39 Selector 40 Output pointer 41 Packet buffer 42 Selector 43 ID addition circuit 44 Answer decoder 45, 46 Selector 51 Buffer 52 Packet I
D decoder 53 packet counter 54 packet number decoder 55 comparator 56 OR circuit
OR 57 Answer buffer 58 Packet buffer in control unit 59 Timer 60 Track number management table 61 ID removal circuit 62 Selector 63 Output pointer 64 Input pointer 65 Packet buffer 66 Selector 67 Main control unit 68 Packet buffer out control unit 69 Selector 70 Selector TRFa, TRFb Transfer ready flag PNRa, PNRb Packet number register AWF Answer wait flag BWF buffer ready flag

Claims (5)

[Claims] 1. A data transfer device for transferring a plurality of pieces of data divided into packets from a transfer side device to a reception side device in units of the data, wherein the transfer side device includes a plurality of sets of transfer buffers. When the data is stored in the empty transfer buffer and transferred to the receiving device, and when a response to the abnormal reception of the data is received from the receiving device, the data is stored in the transfer buffer in which the data is stored. A transfer control unit that retransmits data after the designated storage pointer, and sets a transfer buffer storing the data to an empty state when the response from the receiving side device is a normal reception, and responds to the abnormal reception response. A transfer buffer control unit that, when received, points to the pointer of the abnormal reception first packet in the buffer; a plurality of sets of reception buffers provided in the reception side device; The received data is stored in an empty reception buffer, and in the case of normal reception, the data reception processing is performed and a normal reception is responded to the transfer side device. A reception control unit that stores the retransmitted data after the designated storage pointer of the corresponding reception buffer, and sets the reception-processed reception buffer to an empty state, and in the case of the abnormal reception, And a receiving buffer control unit for indicating a storage pointer of the abnormal reception head packet of the corresponding buffer. 2. A data transfer device for transferring a plurality of data divided into packets from a transfer side device to a reception side device in units of the data, wherein the transfer side device includes a plurality of sets of transfer buffers, The data is stored in the empty transfer buffer and transferred to the receiving device, and when a response to the abnormal reception of the data is received from the receiving device, an instruction of the transfer buffer storing the data is issued. A transfer control unit that retransmits the data after the stored storage pointer, and sets a transfer buffer storing the data to an empty state if the response from the receiving device is a normal reception,
A transfer buffer control unit that, when receiving a response to the abnormal reception, points to the pointer of the abnormal reception first packet in the buffer. 3. A data transfer device for transferring a plurality of data divided into packets from a transfer side device to a reception side device in units of the data, wherein the reception side device includes a plurality of sets of reception buffers, The received data is stored in the empty reception buffer, and in the case of normal reception, the reception processing is performed and the normal reception is returned to the transfer side device.In the case of the abnormal reception, the abnormal reception first packet number is returned. A reception control unit for storing data retransmitted from the first packet from the transfer side device after a designated storage pointer in a corresponding reception buffer, and setting the reception-processed reception buffer to an empty state. A reception buffer control unit for pointing to a storage pointer of an abnormal reception head packet of a corresponding buffer in the case of the abnormal reception. Characteristic data transfer device. 4. A data transfer method for transferring a plurality of data, each of which is divided into packets, from a transfer-side device to a reception-side device in the data unit, wherein the transfer-side device sends a response to abnormal reception from the reception-side device. If received, retransmit the packet data after the abnormal reception first packet of the data, the receiving side device stores the abnormally received data, and stores the corresponding packet data in the data by the retransmitted packet data. Replace
A data transfer method, characterized in that: 5. The transfer-side device is provided with a plurality of transfer buffers for storing transfer data in the data unit and storing until a normal reception response, and the reception-side device stores the received data in the data unit and receives abnormal reception. In the case of, a plurality of receiving buffers for storing the data are provided, and when the transfer buffer is empty, the next data is continuously transferred regardless of whether or not there is a response from the receiving device. The data transfer method according to claim 4, wherein: