JPS59167144A - Information transmitting system - Google Patents

Abstract

PURPOSE:To process a relatively large quantity of transmission information quickly at the reception side by dividing data which is transmitted following control information to plural blocks and adding check information to every block and checking the occurrence of transmission error in block units at the reception side. CONSTITUTION:A processor 31 transmits control information 21 including a control code C1 meaning the true data transmission and a CRC interval C2 and sets a number D of data bytes corresponding to the value of the CRC interval C2 included in control information 21 to a counter 33 and instructs a CRC operating circuit 32 to start the CRC operation and read out transmission data from a memory 30 byte by byte. A CRC byte is added to every data block consisting of a prescribed number of bytes which corresponds to the value of the code C2. When one-block components of data consisting of a prescribed number of bytes are received, the value of a counter 42 becomes zero, and the next CRC byte and the CRC operation result due to an operating circuit 41 are collated with each other, and the result is outputted to a register 44. A processor 50 takes in the value of the register 44 to decide whether an error occurs or not.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to an information transmission method in an information processing system, and particularly to an information transmission method suitable for minimizing effects caused by information transmission errors υ.

[Background of the invention]

In an information processing system, the following method 2'' has conventionally been typical as an information transmission method that allows the receiving side to detect errors in information that occur during transmission.

The first method is a method in which parity is added to each byte and the parity signal is sent in parallel with the data signal to be transmitted.

The second method adds a check code such as OR or 0 that reflects the entire data to the end of a series of multiple bytes of data to be transmitted following control information, and the receiving side adds this check code. This is a method of detecting the end of received data using

However, the first method has a drawback in that it requires an extra signal line for transmitting a parity signal in addition to the signal line for transmitting the data portion.

In the second method, such extra signal lines are not a problem, but depending on the nature of the receiving device, there are problems such as the following. In the case of optical disk storage devices, a large amount of information is recorded by irradiating a metal film formed on the disk surface with a laser beam to form holes called bits. For an optical disk storage device with such a property that it is impossible to correct the recording, that is, to re-encode the information in the area where the data has been stored, the above-mentioned M
When transmitting υ write data using the two methods, considering the occurrence of write errors due to information errors in the transmission system,
All received data is -H buffered on the storage device side, and after confirming that there are no transmission errors in the received data using the check code received last, the data in the buffer memory is written to the disk surface. need to be processed.

In this case, in addition to requiring a large-capacity buffer memory, data reception and data output to the disk are sequential, so the f'i convolution process becomes significantly slower depending on the amount of data.1. On the other hand, if the data storage operation starts on the disk without waiting for an error check using the check code, the sending side must check the data writing start position on the disk and the amount of data to be stored. Since it is necessary to always be aware of and prepare for the occurrence of errors, there is a problem in that transmission control becomes complicated.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an improved information transmission system that allows a relatively large amount of transmitted information to be quickly processed on the receiving side using a transmission path consisting of a minimum number of signal lines.

Another object of the present invention is to exchange information such as optical discs.
An object of the present invention is to provide an information transmission method suitable for an information processing system including an auxiliary storage device that uses a recording medium that cannot be used.

[Summary of the invention]

In order to achieve the above object, the information transmission system according to the present invention includes a first device that sequentially outputs a plurality of pieces of data to a transmission path following control information, and a first device that is connected to the transmission path and receives data in accordance with the control information. and a second device that processes data, wherein the first device blocks the series of data by a predetermined number of bytes, adds check information for checking transmission errors to each block, and sends it out; The second device is characterized in that each time it receives the check information, it performs a transmission error check on the received data in block units; In order to make this possible, information for indicating the length of each data block should be included in the control information sent prior to the data part1.
, [Embodiments of the Invention] Details of the present invention will be described below based on embodiments with reference to the drawings.

FIG. 1 is a diagram schematically showing the overall configuration of an information processing system to which the present invention is applied, in which 11 is a data processing device on the information transmitting side, and 12 is an information receiving side equipped with an information storage medium 14. The storage device 13 is a signal transmission path consisting of a control line with a signal line surface capacity that transmits multiple bits of information in parallel in units of bytes, and this signal transmission path includes signals #! to detect errors in information. (Parity signal #) is not needed.

When the information storage medium 14 is an optical disk, the information storage area is configured as shown in FIG. 2, for example.

That is, there are multiple tracks on the storage medium 14,
Each track is divided into a plurality of storage areas (sectors) each having an information storage capacity of a predetermined number of bytes, and received information is recorded on the medium in units of sectors. In FIG. 2, the tracks are numbered O-X from the inside to the outside of the disk surface.

Each track includes sectors numbered from 0 to y.

Now, from sector y of the nth track on the storage medium 14, in
+1) The flow of information in the information transmission system according to the present invention will be explained with reference to FIG. 3, taking as an example the case where data for four sectors up to sector 2 of the rack is written.

In FIG. 3, 11' indicates an interface section on the data processing device 11 side, and 12' indicates an interface section on the storage device 12 side.
Data 20 for four sectors indicated by IDs 0A to 2[ID are sent to the transmission line 13 via the interface 11'. At this point, the data processing unit [11 passes the control information 21 and the data 2o@next to the interface 11' without being aware of the addition of the code. interface 1
1' divides the received data 20 into data blocks (20A, 20B, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200.
), a check code 22 (22A to 22D) is created for each data block, and the check code 22 (22A to 22D) is added to the data block and sent out one after another.

On the other hand, since the storage device side interface unit 12' can know the data interval from the control information 21 first received via the transmission path 13, it checks the data block 20A that is received subsequent to the control information. The data is checked using the code 22A, and if there is no error, the data is passed to the signal processing unit 12 of the storage device.Similarly, the data blocks 20B, 200.20D are also checked by the check codes 22B, 220.20 added to each block. 22D
If there is no error, the data is sequentially passed to the processing unit 12. At this time, the signal processing unit 12 receives the data that has been erroneously checked in units of sectors, so it buffers these data and stores them in a predetermined location on the storage medium 14, for example, when they are collected in units of tracks. Write operations can be initiated on sectors within a track one after another.

If an error is detected in the above-mentioned checking operation, the data processing device 11 is notified of this and requests retransmission of the data. Even if the writing is corrupted, only the data that has been verified as correct is recorded on the storage medium 14, so it is extremely difficult for the data processing device 11 to transfer the erroneous portion of the data to the storage device 12. It's easy.

Next, a specific embodiment of the information transmission system shown in FIG. 3 will be described using FIGS. 4 to 8.

FIG. 4 shows an information processing system consisting of a data processing device 11, an optical disk format control device (OFO) 12A1, and an optical disk drive unit (ODU) 12B.

The data processing unit [11 includes a processor 31, a main memory 30 that stores programs for operating the processor and various information (data), and a circuit 35 that generates a cyclic code ORO that is a data check code. It consists of an interface control blue section 36, and an ORO generation circuit 3.
5 consists of an arithmetic circuit 32 including a counter 33 for counting the number of bytes of transmitted data, and a selector circuit 34.

On the other hand, optical disk format control device (OFO) 1
2A is for operating the optical disk drive unit (ODU) 12B in response to commands from the processing device 11, and is connected to the interface control unit 36 on the processing device side by a data bus 70 and a control line 71. an interface control unit 40, an ORO check circuit 45, a buffer memory 46 that temporarily stores information to be stored on the optical disk 14, an E00 circuit 47, and a A modulation circuit 48 that performs demodulation into a digital signal, an interface control section 49 connected to the optical disk drive device 12B,
Consisting of a microprocessor 50 that controls these elements and a memory 51 that stores programs and data necessary for the operation of this microprocessor 50, the ORO check circuit 45 checks the received data to find 0) LO. an arithmetic circuit 41 including a counter 42 for counting the number of bytes; a gate circuit 43 for excluding OR, O%- from received data and sending it to a buffer memory 46;
Register 4 for storing the check results by ORO
It consists of 4.

The optical disk drive unit (ODU) 12B is as described above.

Driving, reading/reading the optical disk 14 under the control of the OFO
Performs operations such as spacing seek when writing. As already explained in FIG. Blocking data, inserting a check code, and separating the check code on the receiving side are performed. For these purposes, the control information 21 is, for example, as shown in Figure #45, 0) Data blocks that are the unit of LO addition. CRO interval instruction section 02 indicating the length of
The configuration may include the control code section 01 and the control code section 01 other than this. This lifting control code C1 indicates the type of data following the control information 21 (true data, control data, report data, etc.), and for example, 01 is a code indicating control data. In this case, the data section included in the control information specifies read/write operation distinction, start address data length, etc.

In order to show the correspondence between the ORO interval instruction section 02 and the length of the data block, that is, the number of data bytes in one block, for example,

The table shown in FIG. 6 is incorporated into the main memory 30 of the data processing device on the sending side and the memory 151 of the OFO on the receiving side. In the table of FIG. 6, corresponding to the value 1011<S~CF)16 of ORO interval 02, for example, when the value of 02 is p16, ORO is not added, (1)16
016 indicates that ORO is added in units of a byte, and 016 indicates that ORO is added in units of n bytes. If such a table is prepared, an arbitrary amount of data can be applied to processing on the receiving device side by including a value of 02 according to the type of receiving device in the control information 21 on the data processing device side. Divide the data into block units and add ORO.

can do.

Next, data output control executed by the processor 31 in the processing device 111 will be explained.

Prior to transmitting the real data, the processor 31 first transmits to the OFO control data instructing the data convolution start position and data amount. When 0FO12A receives this control data, it writes to 0DU12B at the write start position.

When the optical head positioning is commanded and the positioning operation is completed, a report of the completion of positioning is sent to the processing device 11.

After receiving the completion report, the processor 31 performs the data transmission operation according to the procedure shown in FIG.

That is, in the routine 100, the control information 21 including the control code C1 indicating true data transmission and the ORO interval 02 is transmitted, and then the ORO interval included in the control information 21 is transmitted.
The number of data bytes corresponding to the value of RO interval 02 is stored in the counter 33.

Setting routine 102), OR, O operation circuit 32
The routine 104. instructs to start the OR, 0 operation.
) Read the transmitted data one byte at a time from the memory 60,
(/l/-chin 106). At this time, ORO calculation circuit 3
2 is an ORO every time data is read from the memory 30.
The selector 34, which performs calculation and subtraction (-1,) operation of the value of the counter 33, performs an OR operation when the value of the counter 33 is zero.
Since it operates to select the CRO byte held by the O operation circuit 52 and select the output of the memory 30 for the others,
As shown in routines 108 and 110, an ORO byte is added to each data block of a predetermined number of bytes that corresponds to the value of C2. After transmitting the ORO byte, if there is a report from the receiving device that a transmission error has occurred (routine 112), the error processing routine 114 is executed, and if there is no error report, the determination routine 116 executes the transmission of all data. It is determined whether or not the process has been completed, and if untransmitted data remains, the process returns to routine 102, and if all data has been completed, the data transmission allocation is ended.

FIG. 8 is a 70-chart showing the operation procedure of the receiving side device 12A corresponding to the above transmission operation.

When the interface control unit 40 receives the command and control information 21 (routine 200), the control information 2
The number of data bytes corresponding to ORC interval 02 included in 1 is obtained from the table in the memory 51, and this is set in the counter 42, and the ORO calculation circuit 41 is instructed to start the ORO calculation (routine 201).
. The interface control unit 40 sends the received information following the control information 21 to the ORO calculation circuit 41 and gate 43 one byte at a time. At this time, the ORO operation circuit 41 performs the ORO operation while subtracting the value of the counter 42 by 1 for each byte input, but when the value of the counter 42 is other than zero, the gate 43 is open, so 0 ．． Data other than the RO byte will be stored one after another in the buffer memory 46 (routines 202 and 203).

When a certain number of bytes of data for one block is received,
If the value of the counter 42 is zero, the next received byte is O.
The RO byte is compared with the result of the ORO operation performed by the arithmetic circuit 41 on the one block of data, and the result is output to the register 44. The processor 50 reads the value of the register 44 and determines whether an error has occurred (routine 204). If there is no error, it is determined whether all data has been received in routine 206).
, if the data has been received, the process advances to routine 208, in which the optical disk drive unit 12B is instructed to transfer the data in the buffer memory 46 and to fold the data into the optical disk.

If the reception of all data is not completed in the determination routine 206, the process proceeds to a determination routine 207, in which it is determined whether all the input data for one track has been collected. In this judgment, if the data reception for each track has been completed, the process advances to routine 20B; otherwise, the process returns to routine 201, and the reception operation and operation for the next data block are repeated.

The data storage capacity of the data buffer memory 46 is designed to be at least the amount of data equivalent to y sectors of one track on the optical disk. For example, in the example shown in FIG. 3, track n receives data of sector y. After that, when the data of sector 2 is received in track n+1,
Data output to 0DU12B by routine 208 and ★
If the data processing device 11 outputs negative data for several tracks with one commitment command, the storage device ti141112A/12
In B, in parallel with the data reception operation, it is possible to efficiently execute the storage operation for each track on the disk. After issuing the storage instruction to 0D012B, 0FO1
2A waits for the completion report from ODU (routine 2)
09), OD U when receiving 4i-inclusive completion report
- Determine whether there is a filling error in Illll (routine 210). If there is an error, the process proceeds to the error processing routine 205, otherwise the process proceeds to the determination routine 212, and it is determined whether or not the processing of all data corresponding to the current write command has been completed. .

If all steps are completed, the data processing unit [119
Outputs a processing completion report signal to 111 (routine 213)
This program is then terminated, and if unprocessed data remains, the process returns to routine 201 to continue receiving data. At the end of the explanation, in Figure 8, the flowchart is expressed in a format in which the OFO waits for a completion report from the ODU after a convolution instruction is given to the ODU, but the above completion report is processed in the form of an interrupt. It is more practical to continue performing the data reception operation (routines 201 to 207) even during the waiting period when there is unprocessed data.

In the embodiment shown in FIG. 4, the data processing device [11 and 0F
Although the system configuration includes an OPU 12A and an ODU 12B, the transmitting side device 11 may be a channel control device interposed between the OPU and the terminal.

[Young fruit of invention]

As can be understood from the above explanation, according to the information processing method of the present invention, the data sent following the control information is divided into a plurality of blocks, and check information is added to each block. It becomes possible to check whether a transmission error has occurred on a block-by-block basis on the receiving side, and to process these already received data in parallel with the reception operation of subsequent data. Also, some of the received data.

Even if a transmission error is detected in the subsequent data after the processing is completed, all the data portions of the processed data have been transmitted normally and do not contain any erroneous data. Therefore, the process of retransmitting data when a transmission error occurs is extremely simple. For example, the transmitting device detains all data in a year, and the receiving device retransmits the received data up to the block where the previous error occurred. Of course, you can just ignore it and restart normal reception processing from the block in question.
It is also possible to adopt a format in which the data is retransmitted starting from the data section where the error has occurred, but in this case, the retransmission start position only needs to be specified as the position of the data block, so transmission control on the transmitting side is simple.

[Brief explanation of the drawing]

Figure 1 shows one configuration of an information processing system implementing the present invention.
A schematic diagram showing an example, FIG. FIG. 5 is a block diagram of an information processing system including an optical disk storage device according to an embodiment of the present invention. FIG. 5 is a diagram showing an example of the format of the control information section sent out prior to the data section. FIG. FIGS. 7 and 8 are flowcharts showing an example of a control procedure for implementing the present invention in a sending device and a receiving device, respectively, showing the structure of a table used for data blocking. Explanation of symbols 11... Data processing device (transmission side device) 12.
...Storage device (receiving side device) 11'...
Sending side interface control unit 12'...Receiving side interface control unit 12N11101. Optical disc format control device (OFO) 12B... Optical disc drive unit (ODU) 14
・・・・・・Storage media (optical disk) Patent attorney Akio Takahashi No. 1, No. 2, No. 3, Ward 40, No. 70

Claims (1)

[Scope of Claims] (1) A ratio 1 device that outputs multiple bytes of data to a transmission line following system 1 information, and is connected to the transmission line and processes the received data according to the control information. In the information processing system, the first device blocks the above-mentioned -compliant data by a predetermined number of bytes, adds all check information for transmission error detection to each block, and sends the above-mentioned data. Each time the two devices receive the above check information,
An information transmission method characterized by checking transmission errors of received data on a block-by-block basis (2) The control information includes information for indicating the length of each data block, and the second device uses the information as an index. The information transmission method according to item 1, characterized in that the data block to be subsequently received is separated and the check information is identified based on the information transmission method.(3) The second device has a data storage capacity for a plurality of blocks. It consists of a received data processing unit equipped with a buffer memory, and a data storage device connected to the received data processing unit,
A second characteristic of vc-% is that data is transferred from the buffer memory to the storage device each time data storage in the buffer memory reaches a predetermined condition.
Information transmission method described in section. (4) The storage device includes a disk as an information storage medium, each track having a predetermined number of sectors for data recording, and the data output from the first device to the transmission path corresponds to the data capacity of each sector. 4. The information transmission method according to item 3, wherein the information transmission method is performed by dividing each byte into blocks. (5) The information transmission method according to item 4, wherein the disk is an optical disk that records information by forming pits on a recording film by irradiating light.