JP2003296202A - Device and method for data transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for data transmission which improve the performance and reliability of transfer data with a small hardware quantity without increasing the cost of an LSI. <P>SOLUTION: A 3rd LSI 300 being the end point of data transfer comprises: 3rd error detection parts 301 and 311 which detect an error of received data; 3rd resending-request transmission parts 303 and 313 which receive an error report and request 2nd LSIs 200 and 210 as data transmission source to resend data; poison detection parts 302 and 312 which receive the data from the 3rd error detection parts 301 and 311 and detect the data being poisoned (invalidated); 3rd poisoning circuits 304 and 314 which receive error information and the data and poison the data in case of error occurrence; and a first arrival decision circuit 320 which selects first-arrival data between data sent from two paths A and B and sends it out. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device having a dual data transmission path and a resending function on the interface when data is transmitted via an interface connecting a plurality of LSIs (large scale integrated circuits). The present invention also relates to a data transmission method, and more particularly to a data transmission device and a data transmission method that improve reliability of transmission data with a small amount of hardware (HW).

[0002]

2. Description of the Related Art In recent years, a data transmission device in a computer system is required to have a large-scale structure in which a large number of devices are connected and have high performance and high reliability.

Therefore, a conventional data transmission apparatus of this type will be described below with reference to the drawings.

FIG. 4 is a schematic block diagram showing a conventional data transmission device 50.

Referring to FIG. 4, a data transmission device 50.
Is a first LSI 100 which is a starting point of data transfer, two second LSIs 200 and 210 which are data transfer paths A and B from the first LSI 100, and second LSIs 200 and 21.
The third L that is the end point of data transfer when data is transferred from 0
And a first internal logic circuit 110 having a data duplication circuit 111 that duplicates one data and sends it to two paths A and B.
And a first retransmission request receiving section 120, 130 for receiving a data retransmission request from the second LSI 200, 210,
The second LSIs 200 and 210 include the data duplication circuit 111.
Second error detecting units 201 and 211 for detecting an error of each data transferred from the second error detecting unit 20
Error information from the second error detection units 201 and 212 and second retransmission request transmission units 202 and 212 that receive the error notification from the first and second 211 and make a data retransmission request to the first retransmission request reception units 120 and 130. And the data, and if there is an error, the second poisoning circuits 203 and 213 for invalidating the data, and the second poisoning circuit 20.
The second internal logic circuits 204 and 214 for receiving the error-free data or the poison data transmitted from the third LSI 500 and transmitting them to the third LSI 500, and the second retransmission request receiving unit 205 for receiving the data retransmission request from the third LSI 500. ,
215 and the third LSI 500 receives the respective data transferred from the second internal logic circuits 204 and 214 and detects an error, and the third error detection units 501 and 511.
And a third retransmission request transmission unit 503, 5 that receives an error notification from the third error detection unit 501, 511 and makes a data retransmission request to the second retransmission request reception unit 205, 215.
13, third poisoning circuits 502 and 512 for receiving data from the third error detecting units 501 and 511 and generating poison data, and third poisoning circuits 502 and 512.
Data buffer circuits 504, 514 for receiving and storing normal data or poison data sent from
A first-arrival determination circuit 520 that counts the number of each arrival data transmitted from one data transfer path A and B and selects the first-arrival data among the arrival data, and a third internal portion that receives the data selected by the first-arrival determination circuit 520. And a logic circuit 530.

Next, a data transmission method of the data transmission device 50 configured as described above will be described with reference to the drawings.

FIG. 5 is a flowchart showing a data transmission method.

Referring to FIG. 5, transmission data is generated from the first internal logic circuit 110 of the first LSI 100 which is the starting point of data transmission (S101), and the data duplication circuit 11 is generated.
In 1, the transmission data is duplicated (S102) and transmitted to the route A and the route B (S103).

The data sent to the route A and the route B are respectively received by the second error detecting units 201 and 211 (S10).
4).

Whether or not there is an error is detected by the second error detection units 201 and 211 (S105). If there is an error, it is determined whether or not the number of error detections exceeds a threshold value (S10).
6) If the number of error detections for the data is less than or equal to the threshold value, the second error detection unit 201, 211 requests the second retransmission request transmission unit 202, 212 to retransmit the data (S
107), the second retransmission request transmission units 202 and 212 instruct the first retransmission request reception units 120 and 130 of the first LSI 100 to retransmit data (S108), and the first retransmission request reception units 120 and 130 A data retransmission instruction is issued from the first internal logic circuit 110 of the first LSI 100 (S10
9), from the first internal logic circuit 110 to the second error detection unit 2
Data is retransmitted to 01 and 211 (S110).

When an error is detected by the second error detection unit 201, 211 and the number of error detections for the data is larger than the threshold value, the second error detection unit 201, 211 reports an error to the second poisoning circuits 203, 213. (S111) When the error detection is reported in the second poisoning circuits 203 and 213, poison data is generated (S112) and sent to the second internal logic circuits 204 and 214.

If no error is detected by the second error detectors 201 and 211, the second poisoning circuit 20
An error-free report and error-free data are sent to 3 and 213 (S113).

The error-free data or the poison data from the second poisoning circuits 203 and 213 is passed through the second internal logic circuits 204 and 214 to the third error detecting section 50.
It is sent to Nos. 1 and 511 (S114).

Third error detecting section 50 of third LSI 500
1, 511 receive the data sent via the second internal logic circuits 204, 214 (S115), detect the presence or absence of an error (S116), and if there is an error, the number of error detections becomes a threshold value. It is determined whether or not it exceeds (S117),
If the number of error detections for that data is less than or equal to the threshold,
Data retransmission is requested to the third retransmission request transmission units 503 and 513 (S118), and the third retransmission request transmission units 503 and 5
In step 13, the second retransmission request receiving units 205 and 215 of the second LSIs 200 and 210 are instructed to retransmit the data (S1
19), the second retransmission request reception units 205 and 215 issue a data retransmission instruction to the second internal logic circuits 204 and 214 (S120), and the second internal logic circuits 204 and 214 cause the third error detection unit 501, Data is retransmitted to 511 (S121).

When an error is detected by the third error detecting units 501 and 511 and the number of error detections for the data is larger than the threshold value, an error is reported to the third poisoning circuits 502 and 512 (S122), and the third poisoning is performed. Circuit 5
02 and 512 to generate the poison data (S123),
In the above (S116), the third error detection units 501, 5
When no error is detected in 11, the error-free report and the error-free data are sent to the third poisoning circuits 502 and 512 (S124), and the third poisoning circuit 50.
2, 512 receive these (S125).

The third poisoning circuits 502, 512 transmit the error-free data or the poison data to the data buffer circuits 504, 514 (S126), and the data buffer circuits 504, 514 store the received data in the data buffer, The data is read and transmitted to the first-arrival determination circuit 520 (S127).

Here, the data buffer circuits 504 and 51.
When the 4 receives the poison data and the poison data is read to the first word of the data buffer, it waits for the subsequent data to be read for a certain period of time to wait for the arrival of normal data from another route. By controlling, you can control not to use the wrong Poison data.

The first-arrival judging circuit 520 selects the first-arrival data from the data received from the two routes A and B by counting the number of data transmitted from the route A and the number of data transmitted from the route B, respectively. The data of the last arrival is discarded (S128), and the selected data is transmitted to the third internal logic circuit 530 (S129).

[0019]

As described above,
The conventional data transmission device is provided with a data buffer circuit between the poisoning circuit of the third LSI at the end point and the first-arrival determination circuit, and when the data read from the data buffer is the poison data and the first-arrival data, By controlling the arrival of normal data on the other end of the route, it is necessary to control not to use illegal poison data, and in some cases, it may be necessary to wait for reading from the data buffer. Therefore, it is necessary to store all the data transferred from each interface by having a certain number of words in the data buffer based on the data transfer method determined by the protocol of the interface between the respective LSIs. There is a problem that the circuit scale of the circuit increases and the cost of the LSI increases.

When transferring normal data,
Since the storage and read times in the data buffer circuit are added to the total data transfer time, there is a problem that the performance of the data transfer time deteriorates.

An object of the present invention is to reduce hardware (H
W) To provide a data transmission device and a data transmission method in which the performance and reliability of transfer data are improved by the amount.

[0022]

A data transmission apparatus of the present invention includes a first integrated circuit which is a starting point of data transfer, two second integrated circuits which are data transfer paths from the first integrated circuit, and a second integrated circuit. A third integrated circuit to which data is transferred from the integrated circuit and serves as an end point of the data transfer, and the first integrated circuit has means for duplicating one data and sending it to two data transfer paths, The integrated circuit includes an error detecting means for each of the duplicated data, a data retransfer requesting means, a means for invalidating the data when the error remedy cannot be performed by the data retransfer, and the invalidated data to the third integrated circuit. The third integrated circuit has an error detecting means for each of the data transmitted from the second integrated circuit, and a poison detection for receiving the data from the error detecting means and detecting the invalidation data. Section, a data retransfer requesting means for requesting data retransmission when an error is detected by the error detection section and invalidation data detected by the poison detection section, and data retransfer by receiving the data information sent from the poison detection section. The first-arrival decision circuit counts the number of arrival data from each of the two data transfer paths. The first-arrival decision circuit counts the number of arrival data from the two data transfer paths. Then, a means for selecting the first-arrival data from the arrival data is provided.

In the data transmission device of the present invention, the first integrated circuit which is the starting point of the data transfer, the two second integrated circuits which are the data transfer paths from the first integrated circuit, and the data are transferred from the second integrated circuit. A third integrated circuit serving as an end point of data transfer, wherein the first integrated circuit has a first internal logic circuit having a data duplication circuit for duplicating one data and transmitting the duplicated data to two paths; and a second integrated circuit. A second retransmission request reception unit that receives a data retransmission request from the circuit, the second integrated circuit includes a second error detection unit that detects an error in each data transferred from the data duplication circuit; There is an error by receiving the error notification from the error detection unit and making a data retransmission request to the first retransmission request reception unit and the error information and data from the second error detection unit. If From the second integrated circuit that receives the error-free data or the poison data sent from the second poisoning circuit and sends it to the third integrated circuit, and the second integrated circuit that invalidates the data A second retransmission request receiving unit for receiving the data retransmission request of
The third integrated circuit receives the respective data transferred from the second internal logic circuit and detects an error, and a third retransmission request receiving unit that receives an error notification from the third error detecting unit. To the third resend request transmission unit, a poison detection unit that receives data from the third error detection unit and detects the poison data, and error information and no error sent from the poison detection unit. A third poisoning circuit for receiving data or error-free information and poison data, and a first-come-first-served determination circuit for counting the number of each arrival data transmitted from the two data transfer paths and selecting the first-arrival data among the arrival data. It is characterized by having.

The second error detection unit, when a data error is detected and the number of error detections is less than or equal to a threshold value, means for notifying the second retransmission request transmission unit of data retransmission and a data error detected and error detection. If the number of times is larger than the threshold value, it has means for reporting an error to the second poisoning circuit, and if no data error is detected, means for sending an error-free report and error-free data to the second poisoning circuit. Characterize.

The third error detection unit, when a data error is detected and the number of error detections is less than or equal to a threshold value, means for notifying the third retransmission request transmission unit of data retransmission and a data error detection and error detection. When the number of times is larger than the threshold value, it has means for reporting an error to the poison detection unit, and when no data error is detected, it has means for sending an error-free report and error-free data to the poison detection unit. .

The poison detection unit detects the poison data, and when the number of times the poison data is detected is less than or equal to a threshold value, means for notifying the third retransmission request transmission unit of data retransmission, and detecting the poison data and the poison data. If the number of times of detection for is larger than the threshold value, a means for transferring the error-free information and the poison data to the third poisoning circuit, and if the poison data is not detected, the error presence information and the error-free data are converted into the third poison. Means for sending to the circuit.

The third poisoning circuit, when the error information is transmitted from the poison detection unit, means for generating the poison data and transmitting it to the first arrival judging circuit, and when the poison data or the error-free data is transmitted, Means for sending the poison data or the error-free data to the first-arrival judging circuit.

The first-arrival judging circuit is characterized in that it has means for discarding the last-arriving data of the respective arrival data transmitted from the two data transfer paths.

The first integrated circuit, the second integrated circuit, and the third integrated circuit are each characterized by having a large-scale integrated circuit.

According to the data transmission method of the present invention, the duplicated data in the first integrated circuit which is the starting point of the data transfer is passed through the two second integrated circuits which are the data transfer paths, and the third integrated circuit which is the end point of the data transfer. In a data transmission method for transferring data to a circuit, the first integrated circuit has a step of duplicating one data and sending the duplicated data to two data transfer paths, and the second integrated circuit has a step of duplicating each of the duplicated data. An error detection step, a step of requesting data retransfer at the time of error detection, a step of invalidating the data when the error remedy cannot be performed by the data retransfer, and a step of transmitting the invalidation data to the third integrated circuit. The third integrated circuit requires an error detection step for each of the data transmitted from the second integrated circuit and a data retransfer when the error is detected. To receive the data information after detecting the error and detect the invalidation data, to request the data retransfer when the invalidation data is detected, and to receive the data information sent after detecting the invalidation data. The method includes the step of invalidating the data when the error cannot be relieved by the data retransfer, and the step of transmitting the invalidation data to the first-arrival decision circuit. The method is characterized by including the step of counting the number and selecting the first-arrival data from the data transmitted from the two data transfer paths.

According to the data transmission method of the present invention, the duplicated data in the first integrated circuit which is the starting point of the data transfer is passed through the two second integrated circuits which are the data transfer paths, and the third integrated circuit which is the end point of the data transfer. In the data transmission method for transferring data to a circuit, the first integrated circuit duplicates one data by the data duplication circuit in the first internal logic circuit,
And a step of sending the data retransmission request from the second integrated circuit to the first retransmission request receiving section and issuing a data retransmission instruction from the first internal logic circuit when there is a data retransmission request from the second integrated circuit. Then, the second integrated circuit receives the error notification from the second error detection unit in the second retransmission request transmission unit, and a step of performing error detection by the second error detection unit on each data transferred from the data duplication circuit. And the step of making a data retransmission request to the first retransmission request receiving unit, and the error information and data from the second error detection unit are received by the second poisoning circuit, and if there is an error, that data is invalidated. A step of receiving error-free data or poison data sent from the second poisoning circuit by the second internal logic circuit and transmitting the data to the third integrated circuit; The second retransmission request receiving section receives the data retransmission request from the second internal logic circuit when there is a data retransmission request from the product circuit, and the third integrated circuit The step of receiving each data transferred from the internal logic circuit and detecting the error by the third error detecting section, and receiving the error notification from the third error detecting section at the third retransmission request transmitting section and receiving the second retransmission request. A data resend request to the unit, a step of receiving the data from the third error detection unit in the poison detection unit and detecting the poison data, and the error presence information and the error-free data transmitted from the poison detection unit or The step of receiving the error-free information and the poison data in the third poisoning circuit and the number of each arrival data transmitted from the two data transfer paths are counted. Characterized by a step of selecting at arrival judging circuit arrival data of the bets arrived data.

The second error detection unit, when a data error is detected and the number of error detections is less than or equal to a threshold, notifies the second retransmission request transmission unit of data retransmission, and the data error is detected and error detection is performed. If the number of times is greater than the threshold value, the method includes the step of reporting an error to the second poisoning circuit, and the step of sending an error-free report and error-free data to the second poisoning circuit if no data error is detected. Characterize.

The third error detection unit, when a data error is detected and the number of error detections is less than or equal to a threshold value, notifies the third retransmission request transmission unit of data retransmission, and a data error is detected and error detection is performed. If the number of times is greater than the threshold value, a step of reporting an error to the poison detection unit,
If no data error is detected, the method has a step of sending an error-free report and error-free data to the poison detection unit.

The poison detection unit detects the poison data, and when the number of times the poison data is detected is less than or equal to a threshold value, notifies the third retransmission request transmission unit of data retransmission, and detects the poison data and the poison data. If the number of detections for is greater than the threshold value, the step of transferring the error-free information and the poison data to the third poisoning circuit, and if the poison data is not detected,
And sending error information and error-free data to the third poisoning circuit.

The third poisoning circuit, when the error information is transmitted from the poison detection unit, generates the poison data and sends it to the first arrival judging circuit; and when the poison data or the error-free data is transmitted, Sending the poison data or the error-free data to the first-arrival decision circuit.

The first-arrival judging circuit is characterized in that it has a step of discarding the last-arriving data of the respective arrival data transmitted from the two data transfer paths.

Each of the first integrated circuit, the second integrated circuit, and the third integrated circuit is characterized by having a large-scale integrated circuit.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a data transmission apparatus of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic block diagram showing an embodiment of a data transmission apparatus of the present invention.

Referring to FIG. 1, the data transmission device 1 includes
The first LSI 100, which is the starting point of data transfer, and the first LS
Two second LSIs 200 and 210 serving as data transfer paths A and B from I100, and a third LSI to which data is transferred from the second LSIs 200 and 210 and becomes an end point of data transfer.
The first LSI 100 includes a first internal logic circuit 110 having a data duplication circuit 111 that duplicates one data and sends the duplicated data to two paths A and B, and data retransmission from the second LSIs 200 and 210. The second LSI 200, 210 includes a first retransmission request receiving unit 120, 130 for receiving a request, and the second LSI 200, 210 includes a second error detecting unit 201, 211 for detecting an error in each data transferred from the data duplication circuit 111. , Second error detectors 201, 2
The second error detection unit 20 and the second retransmission request transmission units 202 and 212 that receive the error notification from 11 and make a data retransmission request to the first retransmission request reception units 120 and 130.
Second poisoning circuits 203 and 213 for receiving the error information and the data from the first and second 212 and invalidating the data when there is an error; and the second poisoning circuit 203,
Second internal logic circuits 204 and 214 for receiving the error-free data or the poison data transmitted from the second LSI 213 and transmitting it to the third LSI 300, and the second retransmission request receiving units 205 and 21 for receiving the data retransmission request from the third LSI 300.
5, the third LSI 300 receives the respective data transferred from the second internal logic circuits 204 and 214 and performs the error detection, and the third error detection units 301 and 311.
The third retransmission request transmission units 303 and 313 which receive the error notification from the third error detection units 301 and 311 and make a data retransmission request to the second retransmission request reception units 205 and 215.
And a poison detection unit 302 that receives data from the third error detection units 301 and 311 and detects the poison data.
312, and third poisoning circuits 304, 314 for receiving the error presence / absence information and error-free data or poison data sent from the poison detection units 302, 312.
A first-arrival determination circuit 320 that counts the number of each arrival data transmitted from the two data transfer paths A and B and selects the first-arrival data from the arrival data, and a first-arrival determination circuit 32.
Third internal logic circuit 33 for receiving data selected by 0
It consists of 0 and.

Next, a data transmission method of the data transmission device 1 configured as described above will be described with reference to the drawings.

2 to 3 are flowcharts showing a data transmission method.

With reference to FIGS. 2 and 3, transmission data is generated from the first internal logic circuit 110 of the first LSI 100 which is the starting point of data transmission (S1), and the data duplication circuit 1
In 11, the send data is duplicated (S2) and sent to the route A and the route B (S3).

The data sent to the route A and the route B are received by the second error detecting units 201 and 211, respectively (S4).

The presence or absence of an error is detected by the second error detecting units 201 and 211 (S5). If there is an error, it is determined whether or not the number of error detections exceeds a threshold value (S6), and the error detection for that data is performed. When the number of times is less than or equal to the threshold value, the second error detection units 201 and 211 cause the second retransmission request transmission unit 20 to
2, 212 is requested to retransmit data (S7), and the second retransmission request transmission units 202, 212 instruct the first retransmission request reception units 120, 130 of the first LSI 100 to retransmit data (S8). , The first retransmission request receiving unit 120, 13
0 issues a data retransmission instruction from the first internal logic circuit 110 of the first LSI 100 (S9), and the first internal logic circuit 1
Data is retransmitted from 10 to the second error detection units 201 and 211 (S10).

When an error is detected by the second error detectors 201 and 211 and the number of error detections for the data is larger than the threshold value, the second error detectors 201 and 211 report an error to the second poisoning circuits 203 and 213. (S11) When the error detection is reported in the second poisoning circuits 203 and 213, the poison data is generated (S11).
12), and sends to the second internal logic circuits 204 and 214.

If no error is detected by the second error detectors 201 and 211, the second poisoning circuit 20
An error-free report and error-free data are sent to 3 and 213 (S13).

The error-free data or the poison data from the second poisoning circuits 203 and 213 passes through the second internal logic circuits 204 and 214 and the third error detecting section 30.
1 and 311 (S14).

Third error detection unit 30 of third LSI 300
1, 311 receive the data sent via the second internal logic circuits 204, 214 (S15), detect the presence or absence of an error (S16), and if there is an error, the number of error detections becomes a threshold value. It is determined whether or not it exceeds (S17), and when the number of error detections for the data is less than or equal to the threshold, data retransmission is requested to the third retransmission request transmitting units 303 and 313 (S18), and the third retransmission request transmitting unit. In 303 and 313, the second retransmission request receiving unit 20 of the second LSI 200 and 210
5 and 215 are instructed to retransmit the data (S19),
The second retransmission request receiving units 205 and 215 issue a data retransmission instruction to the second internal logic circuits 204 and 214 (S2
0), data is retransmitted from the second internal logic circuits 204 and 214 to the third error detection units 301 and 311 (S21).

When an error is detected by the third error detection unit 301, 311 and the number of error detections for the data is larger than the threshold value, an error is reported to the poison detection units 302, 312 (S22), and in the above (S16). (3) If no error is detected by the error detecting units 301, 311, a report without error and data without error are sent to the poison detection units 302, 312 (S23), and the poison detection units 302, 312 receive them. (S2
4).

The second LSIs on the routes A and B, respectively.
The poisoned data poisoned in 200 and 210 is in an error-free state if it is normally transmitted.

The poison detection units 302 and 312 of the third LSI 300 serving as the end points are connected to the third error detection units 301 and 31.
It is detected whether or not the data sent from 1 is the poison data (no error on the interface) (S2
5) If the poison data is detected, it is determined whether the number of times of detection of the data exceeds a threshold value (S2
6), if it is less than or equal to the threshold value, the third retransmission request transmission units 303, 3
13 is requested to retransmit the data, and the operations after (S18) above are performed.

However, in the case of the poison data, the poison data transmission is repeated up to the specified number of times (threshold value).

Specifically, the second error detection unit 20
The thresholds of the number of error detections in the first and second error detection units 301 and 311 are 3 times,
The threshold value of the number of error detections in 2 and 312 is 6 times.

When the poison data is detected by the poison detection units 302 and 312 and the number of times of detection of the data is larger than the threshold value, the third poisoning circuits 304 and 314.
The error-free information and the poison data are transferred to (S2
7).

When the poison detection unit 302, 312 does not detect the poison data, the error presence information and the error-free data are converted into the third poisoning circuits 304, 314.
(S28).

The third poisoning circuits 304 and 314 receive the information from the poison detection units 302 and 312 (S2).
9) If the error information is received (S30), the poison data is generated (S31), and the first-arrival decision circuit 32 is generated.
0 (S33), and when the poison data or the error-free data is received (S32), the poison data or the error-free data is transmitted to the first-arrival determination circuit 320 (S33).

The first-arrival judging circuit 320 selects the first-arrival data from the data received from the two routes A and B by counting the number of data transmitted from the route A and the number of data transmitted from the route B, respectively. The data of the last arrival is discarded (S34) and transmitted to the third internal logic circuit 330 (S35).

The number of pieces of data transmitted from the route A and the route B and input to the first-arrival determination circuit 320 is the same, and even if an error is detected before being input to the first-arrival determination circuit 320, the data is discarded. Not done.

Next, as an example, a case where a fixed fault occurs in the route A will be described.

When an error is detected in the data received by the second error detection unit 201 of the second LSI 200 on the path A,
From the second retransmission request transmission unit 202 to the first retransmission request reception unit 12
When a data retransmission request is made to 0 and the retransmission data is sent from the first LSI 100 to the second error detection unit 201,
I get an error again.

While the data resending operation is repeated, the second error detection unit 201 transmits the error information to the second poisoning circuit 203 because the number of error detections exceeds the threshold value.

The second poisoning circuit 203 of the path A generates the poison data, and the poison data is sent to the third error detecting section 301 of the third LSI 300 at the end point via the second internal logic circuit 204.

In the poison data received by the third error detecting unit 301, no error is detected and the error is sent to the poison detecting unit 302. From the poison detecting unit 302, the poison data is sent to the third resend request transmitting unit 303. The detected result is reported, a data retransmission request is sent from the third retransmission request transmission unit 303 of the end third LSI 300 to the second retransmission request reception unit 205 of the second LSI 200, and the second retransmission request reception unit 205 transmits the second retransmission request. By sending the resend instruction to the internal logic circuit 204, the poison data is sent again to the third error detection unit 301.

This operation is repeated until the threshold value (6 times) set in the poison detection unit 302 is reached.

While the above operation is repeated, the normal data that has passed through the second LSI 210 on the route B side arrives first at the first arrival determining circuit 320 of the third LSI 300 at the end point, so that the first arrival determination from the route A is made. The poison data sent to the circuit 320 is discarded by the first arrival judging circuit, and the normal data reaches the third internal logic circuit 330.

In the above embodiment, the first LSI 1
Second LSI 200, 2 which becomes a data transfer path from 00
Although 10 has a single-stage configuration, a configuration in which the data transfer path has a plurality of stages, that is, a plurality of LSIs are provided on each of route A and route B
It goes without saying that the present invention also includes a configuration in which is arranged in series and data is transferred to the LSI at the end point.

[0068]

As described above, the data transmission apparatus of the present invention has a simple structure in which the poison detection unit is provided and when the poison data is received, the data transmission request is sent from the poison detection unit to the retransmission request transmission unit. As a result, it is possible to wait for normal data from another route and use it without having a data buffer, and it is possible to perform highly reliable data transmission with a small amount of hardware.

[Brief description of drawings]

FIG. 1 is a schematic configuration block diagram showing an embodiment of a data transmission device of the present invention.

FIG. 2 is a flowchart showing a data transmission method of the present invention.

FIG. 3 is a flowchart showing a data transmission method of the present invention.

FIG. 4 is a schematic block diagram showing a conventional data transmission device.

FIG. 5 is a flowchart showing a conventional data transmission method.

[Explanation of symbols]

1,50 data transmission equipment 100 First LSI 110 First internal logic circuit 111 Data duplication circuit 120, 130 First retransmission request receiver 200, 210 Second LSI 201, 211 Second error detection unit 202, 212 second retransmission request transmission unit 203, 213 Second poisoning circuit 204, 214 Second internal logic circuit 205, 215 second retransmission request receiving unit 300,500 Third LSI 301, 311 Third error detector 302, 312 Poison detector 303, 313 Third retransmission request transmission unit 304, 314 Third poisoning circuit 320, 520 first-arrival decision circuit 330, 530 Third internal logic circuit 501, 511 Third error detector 502, 512 Third poisoning circuit 503, 513 Third retransmission request transmission unit 504, 514 data buffer circuit A, B route

Claims (16)

[Claims] 1. A first integrated circuit which is a starting point of data transfer, two second integrated circuits which are data transfer paths from the first integrated circuit, and data transferred from the second integrated circuit. A third integrated circuit serving as an end point, the first integrated circuit has means for duplexing one data and sending the data to the two data transfer paths, and the second integrated circuit is duplexed. It has an error detection means for each piece of data, a data retransfer request means, a means for invalidating the data when the error remedy cannot be performed by the data retransfer, and a means for transmitting the invalidation data to the third integrated circuit. The third integrated circuit includes an error detection unit for each of the data transmitted from the second integrated circuit, and a poison detection unit that receives the data from the error detection unit and detects invalidation data. Data re-transmission requesting means for requesting data retransmission at the time of error detection by the error detection means and detection of invalidated data at the poison detection section, and data re-transmission for receiving data information sent from the poison detection section. The first arrival judging circuit has means for invalidating the data when the error cannot be relieved by the transfer, and means for transmitting the invalidation data to the first arrival judging circuit, wherein the first arrival judging circuit receives each of the arrival data from the two data transfer paths. A data transmission device comprising means for counting the number and selecting the first-arrival data from the arrival data. 2. A first integrated circuit as a starting point of data transfer, two second integrated circuits as data transfer paths from the first integrated circuit, and data transferred from the second integrated circuit to transfer data. A first internal logic circuit having a third integrated circuit as an end point, the first integrated circuit having a data duplication circuit for duplicating one data and transmitting the duplicated data to two paths; And a first retransmission request receiving unit for receiving the data retransmission request of, the second integrated circuit,
A second error detection unit that detects an error of each data transferred from the data duplication circuit, and receives an error notification from the second error detection unit and sends a data retransmission request to the first retransmission request reception unit. From the second poisoning circuit that performs the second retransmission request transmission unit, the second poisoning circuit that receives the error information and the data from the second error detection unit, and invalidates the data when there is an error, from the second poisoning circuit A second internal logic circuit for receiving the transmitted error-free data or poison data and transmitting it to the third integrated circuit;
A second retransmission request receiving unit for receiving a data retransmission request from the third integrated circuit, wherein the third integrated circuit receives each data transferred from the second internal logic circuit and detects an error. A third error detection unit to perform, a third retransmission request transmission unit that receives an error notification from the third error detection unit and makes a data retransmission request to the second retransmission request reception unit, and the third error detection unit And a third poisoning circuit for receiving the error detection information and error-free data or error-free information and the poison data sent from the poison detection unit, and a poison detection unit for receiving the data from the above and detecting the poison data. A first-come-first-served determination circuit that counts the number of each arrival data transmitted from the two data transfer paths and selects the first-arrival data from the arrival data. That data transmission equipment. 3. The second error detection unit, when a data error is detected and the number of error detections is less than or equal to a threshold value, means for notifying the second retransmission request transmission unit of data retransmission, and a data error detected. If the number of error detections is greater than the threshold value, means for reporting an error to the second poisoning circuit, and if no data error is detected, send an error-free report and error-free data to the second poisoning circuit. And means for doing so.
The described data transmission device. 4. The third error detecting unit, when a data error is detected and the number of error detections is less than or equal to a threshold value, means for notifying the third retransmission request transmitting unit of data retransmission, and detecting the data error. If the number of error detections is greater than a threshold value, means for reporting an error to the poison detection unit, and if no data error is detected, means for sending an error-free report and error-free data to the poison detection unit. The data transmission device according to claim 2, further comprising: 5. The means for notifying the third retransmission request transmission unit, wherein the poison detection unit detects the poison data, and when the number of times of detection for the poison data is less than or equal to a threshold value, the means for notifying the third retransmission request transmitter, If data is detected and the number of times of detection for the poison data is greater than a threshold value, a means for transferring error-free information and the poison data to the third poisoning circuit; and if the poison data is not detected, whether there is an error or not. 3. The data transmission device according to claim 2, further comprising means for sending information and error-free data to the third poisoning circuit. 6. The third poisoning circuit, when the error information is transmitted from the poison detection unit, means for generating the poison data and sending it to the first arrival judging circuit, and the poison data or no error. 3. The data transmission device according to claim 2, further comprising means for transmitting the poison data or the error-free data to the first-arrival judging circuit when the data is transmitted. 7. The first-arrival judging circuit has means for discarding last-arriving data of respective arrival data transmitted from the two data transfer paths.
Alternatively, the data transmission device described in 2. 8. The first integrated circuit, the second integrated circuit,
The data transmission device according to claim 1 or 2, wherein each of the third integrated circuits includes a large-scale integrated circuit. 9. The data duplicated by the first integrated circuit, which is the starting point of data transfer, is transferred to the third integrated circuit, which is the end point of the data transfer, via the two second integrated circuits, which are the data transfer paths. In the data transmission method, the first integrated circuit includes a step of duplicating one data and sending the duplicated data to two data transfer paths, and the second integrated circuit includes a step of detecting an error for each of the duplicated data. A step of requesting data retransfer when an error is detected, a step of invalidating the data when the error remedy cannot be performed by the data retransfer, and a step of transmitting the invalidation data to the third integrated circuit. The third integrated circuit requests an error detection step for each of the data transmitted from the second integrated circuit, and requests data retransfer when the error is detected. And a step of receiving data information after detecting an error and detecting invalidation data,
A step of requesting data retransfer when detecting invalidation data, a step of invalidating the data when the data information transmitted after the detection of the invalidation data is received and error correction cannot be performed by the data retransfer, and the invalidation data To the first-arrival determination circuit, the first-arrival determination circuit counting the number of each arrival data from the two data transfer paths, and the first-arrival data among the data transmitted from the two data transfer paths. A data transmission method comprising the step of selecting. 10. The data duplicated by the first integrated circuit which is the starting point of the data transfer is transferred to the third integrated circuit which is the ending point of the data transfer via the two second integrated circuits which are the data transfer paths. In the data transmission method, the first integrated circuit includes a step of duplicating one data by a data duplication circuit in a first internal logic circuit and transmitting the duplicated data to two routes, and a data retransmission request from the second integrated circuit. And a step of receiving a data retransmission request by the first retransmission request receiving unit and issuing a data retransmission instruction from the first internal logic circuit, wherein the second integrated circuit is transferred from the data duplication circuit. The step of performing error detection on the respective data by the second error detection unit, and receiving the error notification from the second error detection unit at the second retransmission request transmission unit and the first retransmission request A step of making a data resend request to the receiving section; a step of receiving error information and data from the second error detecting section in the second poisoning circuit and invalidating the data if there is an error; Error-free data or poison data sent from the second poisoning circuit is received by the second internal logic circuit and transmitted to the third integrated circuit, and data is sent when there is a data resend request from the third integrated circuit. Receiving a resend request at a second resend request receiving section and giving a data resend instruction from the second internal logic circuit, wherein the third integrated circuit transfers each of the data transferred from the second internal logic circuit. The step of receiving data and performing error detection by the third error detection unit, and receiving the error notification from the third error detection unit by the third retransmission request transmission unit A step of making a data resend request to the transmission request receiving section, a step of receiving the data from the third error detecting section by the poison detection section and detecting the poison data, and an error presence / absence transmitted from the poison detecting section The step of receiving the information and the error-free data or the error-free information and the poison data by the third poisoning circuit, and counting the number of each arrival data transmitted from the two data transfer paths to obtain the first-arrival data of the arrival data. Is selected by the first arrival judging circuit. 11. The second error detection unit, when a data error is detected and the number of error detections is less than or equal to a threshold, reporting the data retransmission to the second retransmission request transmission unit, and detecting the data error. If the number of error detections is greater than the threshold value, a step of reporting an error to the second poisoning circuit, and if no data error is detected, an error-free report and an error-free data are sent to the second poisoning circuit. 11. The data transmission method according to claim 10, further comprising: 12. The third error detection unit, when a data error is detected and the number of error detections is less than or equal to a threshold, reporting the data retransmission to the third retransmission request transmission unit, and detecting the data error. If the number of error detections is greater than the threshold value, a step of reporting an error to the poison detection unit, and a step of sending an error-free report and an error-free data to the poison detection unit if no data error is detected, are provided. The data transmission method according to claim 10, further comprising: 13. The poison detection unit detects the poison data and, when the number of times of detection for the poison data is less than or equal to a threshold value, notifies the third retransmission request transmission unit of data retransmission, If data is detected and the number of times of detection for the poison data is more than a threshold value, a step of transferring error-free information and the poison data to the third poisoning circuit; and if the poison data is not detected, whether or not there is an error Sending information and error-free data to the third poisoning circuit.
The data transmission method described in 0. 14. The third poisoning circuit, when the error information is transmitted from the poison detection unit, generates the poison data and sends the poison data to the first-arrival judging circuit; 11. The data transmission method according to claim 10, further comprising the step of transmitting the poison data or the error-free data to the first-arrival judging circuit when data is transmitted. 15. The data transmission according to claim 9, wherein the first-arrival determination circuit has a step of discarding last-arriving data of respective arrival data transmitted from the two data transfer paths. Method. 16. The data transmission method according to claim 9, wherein the first integrated circuit, the second integrated circuit, and the third integrated circuit each include a large-scale integrated circuit.