JPH0683790A - Data transfer device - Google Patents

Abstract

PURPOSE:To attain the retransfer of each data in broadcast transfer so as to improve the efficiency of data retransfer. CONSTITUTION:This data transfer device is provided with a data transmitter 100a for transmitting broadcast data to an external data bus 30a and (n) data receivers 200a for independently receiving the transmitted broadcast data. A single error signal line 20a is connected to the data transmitter 100a and respective data receivers 200a in common. At the time of detecting an error in their own receiving data, each data receiver 200a reports the detection of the error to the data transmitter 100a and all other data receivers 200a by a wired OR connection circuit 500a through the error signal line 20a. The data transmitter 100 receiving the information of error detection retransmits data to all the data receivers 200a to allow them to receive The data again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer device having one data transmitting device and a plurality of data receiving devices for receiving broadcast data transmitted from the data transmitting device.

[0002]

2. Description of the Related Art In a multiprocessor system, which has recently attracted attention as one of high speed computers, data transfer between processors is frequently executed. As a highly efficient data transfer method in a multiprocessor system, batch transfer of the same data, that is, broadcast transfer from a data transmission device for one processor to a data reception device for each of a plurality of processors is known. However, if an error is detected in the received data, it is necessary to promptly retransmit the data.

In the conventional data transfer apparatus, in the broadcast transfer, the retransfer operation is controlled by using the error detection register provided in each data receiving apparatus. When the data transmitting device transmits the broadcast data on the data bus, each data receiving device individually receives the data on the data bus and individually checks whether or not there is an error in the received data. The data receiving device which has detected an error sets a flag at a predetermined bit position in its error detection register. The data transmission device sequentially reads the error detection register in each data reception device via the data bus each time transmission of one data block composed of a plurality of data ends, not for each data transfer, and When the flag is set in the error detection register of the data receiving device, the transmitted block data is retransmitted. At this time, the data transmission device gives a re-reception request signal to all the data reception devices. In response to the re-reception request signal, each data receiving device prepares for re-reception of the data block by discarding all the broadcast data of the block relating to the error detected by any of the data receiving devices.

[0004]

The conventional data transfer apparatus having the error detection register as described above confirms the presence or absence of error detection for the first time when the transfer of one data block is completed in the broadcast transfer. When an error is detected, the entire data block is re-transferred, so that the efficiency of data re-transfer is remarkably poor, which is a serious obstacle in increasing the transfer speed.

An object of the present invention is to improve the efficiency of data retransfer in broadcast transfer.

[0006]

In order to achieve the above-mentioned object, the present invention allows all the data transmitting devices to operate through a single error signal line so as to realize the re-transfer for each data in the broadcast transfer. The configuration is such that the error detection in the received data in the data receiving device and the error detection in the received data in all other data receiving devices are monitored in real time.

More specifically, the data transfer apparatus according to the invention of claim 1 individually receives one data transmitting apparatus for transmitting broadcast data and broadcast data transmitted by the data transmitting apparatus. A plurality of data receiving devices each having a function of individually checking for the presence or absence of an error in the received data, and a single error signal line commonly connected to each of the data transmitting device and the plurality of data receiving devices It adopts a configuration with and. Moreover, each of the plurality of data receiving devices discards the received data when an error is detected in the received data, and simultaneously discards the received data to the data transmitting device and all other data receiving devices through the error signal line. It further has a function of notifying the detection of the error and discarding the received data even when the detection of the error is notified from any of the other data receiving devices. Further, when the data transmitting device is notified of an error detection regarding the transmitted broadcast data by any one of the plurality of data receiving devices, the broadcast data is retransmitted to all of the plurality of data receiving devices. It was decided to further have the function of retransmitting the broadcast data so that it is received.

According to a second aspect of the present invention, the data transmission device includes storage means for storing data to be transmitted, and code addition means for adding an error check code to the data extracted from the storage means. It is provided with a transmission means for temporarily holding the data to which the error check code is added by the code addition means and for transmitting the data as broadcast data, and a next transmission control means. That is, the transmission control means, when being informed of the error detection of the data transmitted by the transmission means from any of the plurality of data receiving devices, the storage means so as to prohibit the extraction of the next data. It controls the taking out of the data from the device and controls the operation of the transmitting means so that the data held in the transmitting means is retransmitted.

According to a third aspect of the present invention, each of the plurality of data receiving devices receives the broadcast data transmitted by the data transmitting device and temporarily holds the received data; Error checking means for checking the presence or absence of an error and outputting an error detecting signal when an error is detected, a memory means for storing the received data, and an error detecting signal output from the error checking means. In the case of the above, the reception control means for controlling the movement of the reception data from the reception means to the memory means and outputting the error determination signal so as to prohibit the storage of the reception data, and the following coupling: And means. That is, the coupling means drives the error signal line so that when the error determination signal is output from the reception control means, the data transmission device and all other data reception devices are simultaneously notified of the error detection. In addition, when the error signal line is driven by any of the other data receiving devices, a re-reception request signal is given to the reception control means. Moreover, when the reception control means receives the re-reception request signal from the coupling means,
It is further provided with a function of controlling the movement of the reception data from the reception means to the memory means so as to prohibit the storage of the reception data even when the error detection signal is not output from the error checking means.

A data transfer device according to a fourth aspect of the invention is
The configuration further includes a pull-up resistor interposed between the error signal line and the power supply line. Moreover,
Coupling means in each of the plurality of data receiving devices, a drive unit for lowering the potential of the error signal line when an error determination signal is output from the reception control means,
An input unit is provided for generating a re-reception request signal to the reception control unit when the potential of the error signal line is lowered.

According to the invention of claim 5, the data transmitting device transmits test data as broadcast data, and any one of the plurality of data receiving devices is notified of an error detection regarding the transmitted test data. In this case, the test data may be retransmitted by all of the plurality of data receiving devices.

According to the invention of claim 6, the data transmission device further comprises a function of determining that the data transfer device has a permanent failure when the test data is retransmitted a predetermined number of times. .

A data transfer apparatus according to the invention of claim 7 is
One data transmitting device for transmitting broadcast data, n receiving units each having a plurality of data receiving devices and a single individual error signal line commonly connected to the plurality of data receiving devices; n integrating means respectively connected to the individual error signal lines of each of the n receiving units,
The configuration includes a single integrated error signal line commonly connected to the data transmitting device and each of the n integrating means. Moreover, each of the plurality of data receiving devices has a function of individually receiving the broadcast data transmitted by the data transmitting device and individually inspecting the presence or absence of an error in the received data. Furthermore, each of the data receiving devices discards the received data when an error is detected in the received data, and discards the received data through the individual and integrated error signal lines and the n integrating means. It further has a function of notifying all data receiving devices of the error detection at the same time, and discarding the received data even when any of the other data receiving devices is notified of the error detection. Further, when the data transmitting device is notified of an error detection by any of the data receiving devices for the transmitted broadcast data, the broadcast data is re-received by all the data receiving devices. It was decided to further have the function of retransmitting the data.

According to the invention of claim 8, each of the n receiving units further comprises a pull-up resistor interposed between the individual error signal line and the power supply line. Moreover, each of the data receiving devices has a drive unit for lowering the potential of the corresponding individual error signal line when an error is detected in the received data, and the corresponding individual error signal line. And an input unit for generating a re-reception request signal when the potential of is lowered.

A data transfer apparatus according to the invention of claim 9 is
The configuration further includes a pull-down resistor interposed between the integrated error signal line and the ground line. Moreover, each of the n integrating means outputs the integrated error signal when the potential of the corresponding one individual error signal line of the individual error signal lines of each of the n receiving units is lowered. A first switching element for raising the potential of the line; and a second switching element for lowering the potential of the corresponding individual error signal line when the potential of the integrated error signal line is raised It was decided to prepare.

According to a tenth aspect of the present invention, in a data transfer method for transferring broadcast data from one data transmitting device to a plurality of data receiving devices, a step of transmitting broadcast data from the data transmitting device, and the step of transmitting the broadcast data. Individually receiving the broadcast data by the plurality of data receiving devices, individually checking for the presence of an error in the received broadcast data by each of the plurality of data receiving devices, and the plurality of data. If any of the receiving devices detects an error in the received data, simultaneously reporting the error detection to the data transmitting device and all other data receiving devices through a single error signal line,
Retransmitting the broadcast data from the data transmitting device so that the broadcast data related to the detected error is re-received by all of the plurality of data receiving devices.

According to the invention of claim 11, further comprising the step of storing the received data in each of the plurality of data receiving devices when none of the plurality of data receiving devices detects an error in the received data. I decided.

In a twelfth aspect of the invention, when any one of the plurality of data receiving devices detects an error in the received data, the step of discarding the received data in all of the plurality of data receiving devices is further included. I decided to prepare.

[0019]

According to the invention of claim 1, each of the plurality of data receiving devices not only discards the received data when it detects an error in the received data, but also receives any other data. Even when the device detects an error in the received data, it discards its own correct received data. Thus, when any of the data receiving devices detects an error, all the data receiving devices immediately prepare for the re-reception of the broadcast data. On the other hand, when any of the data receiving devices is notified of an error in the transmitted broadcast data, the data transmitting device immediately retransmits the data. As a result, retransfer of each data in broadcast transfer is realized.

According to the invention of claim 2, the broadcast data to which the error check code is added is transmitted from the data transmitting device to the plurality of data receiving devices. Moreover,
The transmitted data is temporarily held together with the error check code in preparation for retransmission.

According to the third aspect of the present invention, in each of the plurality of data receiving devices, not only the storage of the received data of its own in which an error is detected is prohibited, but also one of the other data receiving devices does not operate. Even when the fact that an error is detected in the received data is notified via the coupling means, the storage of the correct received data of itself is prohibited.

According to the invention of claim 4, when none of the data receiving devices detects an error in the received data, the potential of the error signal line is held at High by the interposition of the pull-up resistor. It However, when any of the data receiving devices detects an error, the potential of the error signal line is lowered to Low by the wired OR coupling. Then, the pull-down of the error signal line potential serves as a trigger for generating the re-reception request signal in each data receiving device.

According to the fifth aspect of the present invention, the test results of a plurality of data receiving devices can be obtained at once through the error signal line by the broadcast transfer of the test data.

According to the invention of claim 6, the presence / absence of a permanent failure is determined by the data transmitting device counting the number of times of retransmitting the test data.

According to the invention of claim 7, in each of the n receiving units, each data receiving device receives an error in the received data in another data receiving device in the same receiving unit through a single individual error signal line. Monitor the detection of in real time. Each data receiving device also monitors the detection of an error in the data receiving device in the other receiving section in real time through the individual and integrated error signal lines and the integrating means. Accordingly, when at least one data receiving device detects an error in the received data, all the data receiving devices in all the receiving units immediately discard the received data and prepare for data re-reception. On the other hand, when any of the data receiving devices is notified of an error in the transmitted data, the data transmitting device immediately retransmits the data. As a result, in the configuration in which a large number of data receiving devices are divided into n receiving units, retransfer of each data in broadcast transfer is realized.

According to the invention of claim 8, in each of the n receiving units, when none of the data receiving devices in the receiving unit detects an error in the received data,
The potential of the individual error signal line is held High by the interposition of the pull-up resistor. However, when any of the data receiving devices in the receiving unit detects an error, the potential of the individual error signal line is lowered to Low by the wired OR coupling. Then, the pull-down of the individual error signal line potential serves as a trigger for generating the re-reception request signal in each data receiving device.

According to the ninth aspect of the present invention, while all the potentials of the n individual error signal lines are held at High, the potential of the integrated error signal line is held at Low by the intervention of the pull-down resistor. . However, due to error detection, n
When the potential of at least one of the individual error signal lines is pulled to Low, the potential of the integrated error signal line is pulled to High by the wired OR coupling, so that the error detection is transmitted to the data transmission device. Moreover, the pull-up of this integrated error signal line potential causes the pull-down of all individual error signal line potentials,
It becomes a trigger for generation of the re-reception request signal in all the data receiving devices in all the receiving units.

According to the tenth aspect of the present invention, the data transmitting apparatus immediately retransmits the transmitted broadcast data when any one of the data receiving apparatuses is notified of the error detection through the error signal line. To do. On the other hand, each of the plurality of data receiving devices detects the broadcast data not only when it detects an error in the received data but also when any other data receiving device detects an error in the received data. Re-receive. As a result, retransfer of each data in broadcast transfer is realized.

According to the eleventh aspect of the present invention, when the broadcast data is correctly received by all the data receiving devices, each received data is saved.

According to the twelfth aspect of the present invention, even if each of the plurality of data receiving devices does not detect an error in its own received data, one of the other data receiving devices does not detect an error in the received data. When an error is detected, the correct received data is discarded and the broadcast data is re-received.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A data transfer device according to an embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a data transfer apparatus according to a first embodiment of the present invention. In FIG. 1, 100a is a data transmission device for transmitting broadcast data on the external data bus 30a, and 200a-1 to 200a-n are n units for individually receiving broadcast data on the external data bus 30a. Data receiving device. 20a is a data transmission device 100a and n data reception devices 200a-
1 to 200a-n is a single error signal line commonly connected. The error signal line 20a is connected to the power supply line via the pull-up resistor 50.

The data transmitter 100a includes a transmission controller 102, a data latch 104, an ECC circuit 106 and an F.
The IFO memory 108 is provided. FIFO memory 10
Reference numeral 8 is a storage unit that stores data to be transmitted.
The ECC circuit 106 is a code adding means for adding an error checking code to the data taken out from the FIFO memory 108. Data latch 10
4 temporarily holds the data to which the error check code is added,
Further, it is a transmission means for transmitting the data as broadcast data on the external data bus 30a. The transmission control device 102 controls the fetch address (FIFO pointer) of the data from the FIFO memory 108 and the operation control of the data latch 104. Reference numerals 11 and 12 denote internal data buses, which are provided in the data transmission device 100a.
It serves as a data transfer path between the two circuit blocks 104 to 108.

N data receiving devices 200a-1 to 200a-20
Each of 0a-n includes a reception control device 202, a data latch 204, an ECC circuit 206, a FIFO memory 208, and a wired OR coupling circuit 500a. The data latch 204 is a receiving unit for receiving the broadcast data transmitted by the data transmitting apparatus 100a onto the external data bus 30a and temporarily holding the received data. The ECC circuit 206 is an error checking means for checking the presence or absence of an error in the received data based on the error check code, and supplying an error detection signal 17a to the reception control device 202 when an error is detected. FIFO memory 20
Reference numeral 8 is a memory means for storing the received data.
The reception control device 202 controls the operation of the data latch 204 and the control of the write address (FIFO pointer) of the data to the FIFO memory 208. Further, the reception control device 202 receives the error detection signal 1 from the ECC circuit 206.
When receiving the supply of 7a, the wired OR circuit 50
The error determination signal 16 is supplied to 0a. Wired OR coupling circuit 5 of a certain data receiving device (for example, 200a-1)
00a, when receiving the error determination signal 16 from the reception control device 202, the data transmission device 100a and all other data reception devices (for example, 200a-2 to 200a-).
n) and the potential of the error signal line 20a is lowered to Low at the same time so as to notify the error detection, and the potential of the error signal line 20a is lowered to Low by any other data receiving device (for example, 200a-2). In this case, it is a circuit for giving the re-reception request signal 15a to the reception controller 202. On the other hand, the Low potential of the error signal line 20a is supplied to the transmission control device 102 of the data transmission device 100a as the retransmission request signal 40a.

The transmission control device 102, which has been supplied with the retransmission request signal 40a, stops the update of the FIFO pointer so as to prohibit the fetching of the next data from the transmission side FIFO memory 108, and causes the transmission side data latch 104 to receive the data. Retransmit retained data. On the other hand, the reception control device 20 that has been supplied with the error detection signal 17a or the re-reception request signal 15a
2 controls the movement of the reception data from the data latch 204 to the reception side FIFO memory 208 so as to prohibit the storage of the reception data held in the reception side data latch 204. Specifically, each of the data receiving devices 200a-1 to 200a-1.
The reception control device 202 in 200a-n stops updating the FIFO pointer so as to discard each reception data. As a result, the broadcast data retransmitted from the data transmission device 100a is re-received by all of the n data reception devices 200a-1 to 200a-n.

The broadcast data transmitted from the data transmission device 100a is the same for all data reception devices 200a.
If the data is correctly received in -1 to 200a-n, each received data is saved. That is, the reception control device 202 receives the error detection signal 17a and the re-reception request signal 1
The reception data in the reception side data latch 204 is stored in the reception side FIFO memory 208 and the FIFO pointer is updated only when neither of the supply signals 5a is supplied. On the other hand, the data transmission device 100a starts transmitting the next broadcast data.

FIG. 2 is a CMOS circuit diagram of the data transfer device of FIG.
It is a circuit diagram which shows the internal structure of the wired OR coupling circuit 500a at the time of applying a technology. In FIG. 2, the N-type MOS transistor 510a constitutes a drive unit for lowering the potential of the error signal line 20a to Low when the error determination signal 16 is output from the reception control device 202. The N-type MOS transistor 51
The error determination signal 16 is applied to the gate of 0a, the source is connected to the ground line, and the drain is the error signal line 20.
It is directly connected to a. The buffer circuit 520a constitutes an input unit for generating the re-reception request signal 15a to the reception control device 202 when the potential of the error signal line 20a is lowered.

Normally, the potential of the error signal line 20a is held at High by interposing the pull-up resistor 50. However, when the error determination signal 16 from the reception control device 202 becomes High due to error detection, the N-type MOS transistor 510a becomes conductive, resulting in the error signal line 20.
The potential of a is lowered to Low. When the potential of the error signal line 20a is lowered to Low, the buffer circuit 520a activates the re-reception request signal 15a to the reception control device 202 to Low. If the bipolar transistor technology is applied to the data transfer device of FIG. 1, the wired OR coupling circuit 50 of FIG.
The open drain type N-type MOS transistor 510a in 0a is replaced with, for example, an open collector type NPN type transistor.

FIG. 3 shows the operation of the data transmitter 100a.
FIG. 4 shows n data receiving devices 200a-1 to 200a-
It is a flowchart figure which shows each operation | movement of n respectively.

As shown in FIG. 3, the data transmission device 100
First, in step S31, the transmission control device 10
Under the control of No. 2, data is fetched from the FIFO memory 108. In step S32, the ECC circuit 106 adds an error check code to the retrieved data and holds it in the data latch 104. In step S33, the held data in the data latch 104 to which the error check code is added is transmitted to the external data bus 30a. Next step S34
At the re-transmission request signal 4 through the error signal line 20a
If 0a is received, the process returns to step S33 to retransmit the data held in the data latch 104.

If the retransmission request signal 40a is not received, the process proceeds to step S35 to update the FIFO pointer. Then, in step S36, the presence or absence of the next data is confirmed. If there is next data, the process returns to step S31 to start the transmitting operation.

On the other hand, n data receiving devices 200a-1
~ 200a-n, as shown in FIG. 4, first, in step S41, receives the transmitted data,
The received data is held in the data latch 204. The data held in the data latch 204 is sent to the ECC circuit 206,
In step S42, the presence or absence of an error is checked. EC
If the C circuit 206 detects an error, the process proceeds from step S43 to step S47. Step S47
Then, the error detection signal 1 output from the ECC circuit 206
7a is supplied to the reception control device 202, and the error determination signal 16 is supplied from the reception control device 202 to the wired OR coupling circuit 500a. As a result, the potential of the error signal line 20a is lowered to Low. After driving the error signal line 20a in this way, the process returns to step S41 to start the re-reception operation.

Even if the error is not detected by itself, if an error is detected in the received data in the other data receiving device, the potential of the error signal line 20a is lowered to Low, and as a result, the wired OR coupling of itself is performed. The circuit 500a provides the reception control device 202 with the re-reception request signal 15a. In this case, steps S43 to S44
Even when the process proceeds to step S41, the process returns to step S41 and the re-reception operation is started as in the case where the error is detected by itself.

The reception controller 202 receives the error detection signal 17a.
And the re-reception request signal 15a are not supplied, the process proceeds to step S45, and the FIFO memory 2
The storage of the received data in 08 and the update of the FIFO pointer are executed. Then, in step S46, the presence or absence of the next data is confirmed. If there is next data, the process returns to step S41 to start the receiving operation.

As described above, according to the present embodiment, the data transmission device 100a is used for all the data reception devices 200a-1.
~ 200a-n detection of errors in the received data,
Each data receiving device detects the error in the received data in all other data receiving devices by a single error signal line 2
Since the configuration of monitoring in real time through 0a is adopted, it becomes possible to re-transfer for each data in the broadcast transfer, and as a result, the efficiency of data re-transfer is improved.

(Embodiment 2) FIG. 5 is a block diagram showing the configuration of a data transfer system including a plurality of data transfer devices according to a second embodiment of the present invention. In FIG. 5, 6
00a-1 to 600a-n are data transmission devices 10 respectively.
0a and the data receiving device 200a are n data transfer devices. Each of the data transmitting device 100a and the data receiving device 200a has the same configuration as that of the first embodiment. Reference numeral 700 denotes an interconnection network, which connects n data transfer devices 600a-1 to 600a-n to each other. FIG. 5 illustrates a single external data bus 30b in interconnection network 700. 20d is a single error signal line commonly connected to the data transmission device 100a and the data reception device 200a in each of the data transfer devices 600a-1 to 600a-n. This error signal line 2
0d is connected to the power supply line via the pull-up resistor 50.

In the data transfer system of FIG. 5, one data transfer device 600a-1 to another data transfer device 6
When data is broadcast-transferred to 00a-2 to 600a-n, the transfer source data transfer device 600a-
The same data transfer operation as in the case of the first embodiment is executed by the combination of the data transmitter 100a in No. 1 and the data receiver 200a in each of the transfer destination data transfer devices 600a-2 to 600a-n. To be done. At this time, the single error signal line 20d controls the retransfer operation when an error occurs. The same applies when another data transfer device is the transfer source.

(Embodiment 3) FIG. 6 is a block diagram showing the configuration of a data transfer system including a plurality of data transfer devices according to a third embodiment of the present invention. In FIG. 6, 6
00b-1 to 600b-n are n data transfer devices each having a data transmission function and a data reception function.
Reference numeral 700 denotes an interconnection network, and n data transfer devices 60
0b-1 to 600b-n are connected to each other. FIG. 6 shows a single external data bus 30b in interconnection network 700.
Is illustrated. 20d denotes each data transfer device 600b
It is a single error signal line commonly connected to -1 to 600b-n. The error signal line 20d is connected to the power supply line via the pull-up resistor 50.

N data transfer devices 600b-1 to 60
Each of 0b-n is a data transfer control device 602, a data latch 604, an ECC circuit 606, a FIFO memory 60.
8 and a wired OR coupling circuit 500a.
Reference numerals 61 and 62 denote internal data buses, which are bidirectional data transfer paths between the three circuit blocks 604 to 608.

The FIFO memory 608 is a memory for storing data to be transmitted and storing received data. The ECC circuit 606, as shown in FIG.
An error correcting code addition circuit 62 for adding an error correcting code to the data taken out from the O memory 608 and supplying this to the data latch 604.
0, and an error check / correction circuit 630 for checking the presence or absence of an error in the received data from the data latch 604 based on the error correction code and correcting the error if possible.
An error detection signal output circuit 610 for supplying the error detection signal 67 to the data transfer control device 602 is provided.
The data latch 604 has a function of temporarily holding the data to which the error correction code is added and transmitting the data to the external data bus 30b, and a function of receiving the data on the external data bus 30b and temporarily holding the received data. It has both functions.

The data transfer control device 602 receives the fetch address of the data from the FIFO memory 608 and the FI.
It controls the write address of data to the FO memory 608 and the operation control of the data latch 604. Further, when receiving the error detection signal 67 from the ECC circuit 606, the data transfer control device 602 supplies the error determination signal 66 to the wired OR circuit 500a. The wired OR coupling circuit 500a includes a data transfer control device 602.
If the error determination signal 66 is supplied from the device, the potential of the error signal line 20d is lowered to Low, and if the potential of the error signal line 20d is lowered to Low by any other data transfer device, the data is dropped. This is a circuit for giving the re-reception request signal 65 to the transfer control device 602. Further, the Low potential of the error signal line 20d is supplied to the data transfer control device 602 as the retransmission request signal 40c.

In the data transfer system of FIG. 6, one data transfer device 600b-1 to another data transfer device 6
00b-2 to 600b-n, when data is broadcast-transferred, the transfer source data transfer device 600b-
The data transfer control device 602 in 1 selects the transmission operation,
The data transfer control device in each of the transfer destination data transfer devices 600a-2 to 600a-n selects the receiving operation.
As a result, the same data transfer operation as in the first embodiment is executed. At this time, the single error signal line 20d controls the retransfer operation when an error occurs. The same applies when another data transfer device is the transfer source.

(Embodiment 4) FIG. 8 is a block diagram showing the structure of a data transfer apparatus according to a fourth embodiment of the present invention. In FIG. 8, reference numeral 100a is a data transmission device for transmitting broadcast data. 400-1
To 400-n are k data receiving devices 200a-
1 to 200a-k are n receiving boards. Data transmission device 100a and individual data reception device 200
Each of a-1 to 200a-k has the same configuration as that of the first embodiment. Then, the data transmission device 100a
A data bus (not shown) is provided so that the broadcast data transmitted by each of the n reception boards 400-1 to 400-n is individually received by all the data reception devices.

N reception boards 400-1 to 400-n
Are k data receiving devices 200a-1 to 200a, respectively.
-A single individual error signal line 20b commonly connected to k
1-20b-n. Each of these n individual error signal lines 20b-1 to 20b-n is connected to a power supply line via a pull-up resistor 50 and a single integrated error signal line via an error signal line coupling circuit 530. It is connected to 20c. Furthermore, the integrated error signal line 20
c is connected to the ground line via the pull-down resistor 51. When the potential of the integrated error signal line 20c is raised to High, the High potential becomes high.
00a as a retransmission request signal 40b.

FIG. 9 is a CMOS circuit diagram of the data transfer device of FIG.
FIG. 9 is a circuit diagram showing an internal structure of each of n error signal line coupling circuits 530 when technology is applied. Figure 9
In the P type MOS transistor 550, the integrated error signal line is generated when the potential of the corresponding one individual error signal line 20b of the n individual error signal lines 20b-1 to 20b-n is lowered to Low. 20c potential is Hi
It constitutes the first switching element for pulling up to gh. The individual error signal line 20b is connected to the gate of the P-type MOS transistor 550, the source is connected to the power supply line, and the drain is the integrated error signal line 2
0c is directly connected. N-type MOS transistor 5
40 is one individual error signal line 2 corresponding to the case where the potential of the integrated error signal line 20c is raised to High.
It constitutes a second switching element for lowering the potential of 0b to Low. The integrated error signal line 20c is connected to the gate of the N-type MOS transistor 540, the source is connected to the ground line, and the drain is connected to the individual error signal line 20b.

Normally, the potentials of all the individual error signal lines 20b-1 to 20b-n are kept at High by the intervention of the pull-up resistor 50, and the potentials of the integrated error signal line 20c are kept at Low by the intervention of the pull-down resistor 51. Has been done. However, when the potential of any one of the individual error signal lines 20b is lowered to Low by the error detection, the P-type MOS transistor 550 in the one error signal line coupling circuit 530 connected to the individual error signal line 20b is detected. As a result of conduction, the potential of the integrated error signal line 20c becomes High.
be raised to h. Therefore, the data transmission device 10
A retransmission request signal 40b is given to 0a. Further, when the potential of the integrated error signal line 20c is raised to High, the N-type MOSs in all the error signal line coupling circuits 530.
As a result of the transistor 540 becoming conductive, the potentials of all the individual error signal lines 20b-1 to 20b-n are lowered to Low. Therefore, the error detection in the received data in a certain data receiving device is transmitted not only to the other data receiving devices in the same receiving board but also to the data receiving devices in all other receiving boards, and the respective re-reception request signals are generated. To be done. As a result, retransfer of each data in the broadcast transfer becomes possible, and as a result, the efficiency of data retransfer is improved.

If the bipolar transistor technology is applied to the data transfer device shown in FIG.
The open drain type P-type MOS transistor 550 in the error signal line coupling circuit 530 is an open collector type PNP type transistor, and the open drain type N type MOS transistor 540 is an open collector type NPN type transistor. Will be replaced.

(Fifth Embodiment) FIG. 10 is a block diagram of a data transfer system having a crossbar coupling structure according to a fifth embodiment of the present invention. In FIG. 10, 100a-
Reference numerals 1 to 100a-4 are first to fourth data transmission devices each having the same configuration as that of the first embodiment. 200a-
Reference numerals 1 to 200a-4 are first to fourth data receiving devices each having the same configuration as that of the first embodiment.

From the first data transmitter 100a-1 to the first and second data receivers 200a-1 and 200a-
Data is broadcast-transferred to 2 via the first external data bus 30c-1. 20e-1 is the first
The first error signal line is commonly connected to the data transmission device 100a-1 and the first and second data reception devices 200a-1 and 200a-2. From the second data transmission device 100a-2 to the third and fourth data reception device 200
a-3, 200a-4 to the second external data bus 30
Data is broadcast-transferred through c-2.
20e-2 is the second data transmitting device 100a-2 and the third and fourth data receiving devices 200a-3, 200.
It is a second error signal line commonly connected to a-4. Data is broadcast-transferred from the third data transmission device 100a-3 to the first and third data reception devices 200a-1 and 200a-3 through the third external data bus 30c-3. 20e-3 is the third data transmitting apparatus 100a-3 and the first and third data receiving apparatus 2
00a-1, 200a-3 is a third error signal line commonly connected. From the fourth data transmission device 100a-4 to the second and fourth data reception devices 200a-2, 200
Data is broadcast-transferred to a-4 via the fourth external data bus 30c-4. 20e-4 is
Fourth data transmission device 100a-4 and second and fourth
Is a fourth error signal line commonly connected to the data receiving devices 200a-2 and 200a-4. The first to fourth error signal lines 20e-1 to 20e-4 are connected to power supply lines via pull-up resistors 50, respectively.

The first to fourth data transmitters 100a-1
100a-4 each have a function of transmitting test data as broadcast data. For example, the first
And second data transmission devices 100a-1 and 100a-2
Simultaneously transmit the test data, the test data transmitted from the first data transmission device 100a-1 will be transmitted to the first and second data reception devices 200a-1 and 200a-2.
In addition, the test data transmitted from the second data transmitting device 100a-2 is the third and fourth data receiving device 200a.
-3, 200a-4 are individually received. On this occasion,
First and second data receiving devices 200a-1 and 200a
-2, if there is an error in the received data,
The potential of the first error signal line 20e-1 is lowered to Low. Accordingly, the first data transmission device 100a
-1 recognizes the occurrence of an error and retransmits the same test data. When the same test data is retransmitted a predetermined number of times, the first data transmission device 100a-1
Determines that the portion related to the first and second data receiving devices 200a-1 and 200a-2 in the present data transfer system has a permanent failure. Similarly, the second data transmission device 100a-2 is connected to the third and fourth data reception devices 2a and 2b.
The presence or absence of a permanent failure in the portion related to 00a-3 and 200a-4 is inspected. Third and fourth data transmission device 100a
The same applies when the test data is broadcast-transferred from -3, 100a-4.

As described above, according to this embodiment, the test results of a plurality of data receiving devices can be obtained at a time through the error signal line by the broadcast transfer of the test data, so that the test of the data transfer system is accelerated.
In addition, by counting the number of times the test data is retransmitted, a permanent failure of the data transfer system can be detected at high speed by distinguishing it from a catastrophic failure caused by crosstalk or the like.

[0062]

As described above, according to the first aspect of the present invention, the data receiving device which has detected an error in the received data has the data transmitting device and all other data receiving devices through a single error signal line. Since a configuration for notifying the detection of an error is adopted at the same time, it is possible to retransfer every data in the broadcast transfer, and as a result, the efficiency of data retransfer is improved.

According to the invention of claim 2, since the transmitted broadcast data to which the error check code is added is temporarily held in the data transmitting apparatus, the data retransmission can be speeded up.

According to the third aspect of the invention, each of the plurality of data receiving devices saves its own received data based on both the error detection in its own received data and the error detection in another data receiving device. Since the control configuration is adopted, the re-reception of the broadcast data is properly performed in each data receiving device.

According to the invention of claim 4, since the structure for controlling the retransmission of the broadcast data according to the potential of the single error signal line is adopted, the hardware for the retransmission control is simplified. .

According to the fifth aspect of the invention, since the test results of a plurality of data receiving devices are obtained at one time through the single error signal line by the broadcast transfer of the test data, the data transfer device can be tested at high speed. Be converted.

According to the sixth aspect of the invention, since the structure for judging the presence or absence of the permanent failure is adopted by counting the number of times of retransmitting the test data, the permanent failure of the data transfer device is regarded as a sudden failure due to crosstalk or the like. It is possible to distinguish and detect at high speed.

According to the invention of claim 7, a single individual error signal line is provided for each of the n receiving sections provided with a plurality of data receiving devices, and the n individual error signal lines are used for data transmission. Since a structure is adopted in which a single integrated error signal line connected to the device is connected, each data receiving device, when it detects an error in the received data, is connected to the data transmitting device and all other data receiving devices. At the same time, the error detection can be notified. As a result, in the configuration in which a large number of data receiving devices are divided into n receiving units, it is possible to perform retransfer for each data in the broadcast transfer, and the data retransfer efficiency is improved.

According to the eighth aspect of the invention, since the re-reception of the broadcast data is controlled according to the potential of the single individual error signal line in each of the n receiving units, the re-reception control can be performed. The hardware for is simplified.

According to the ninth aspect of the invention, the retransmission of broadcast data is controlled according to the potential of the single integrated error signal line in which the individual error signal lines of each of the n receiving units are wired or coupled. Since the configuration is adopted, the hardware for retransmission control is simplified.

According to the invention of claim 10, the data receiving device which has detected an error in the received data notifies the data transmitting device and all the other data receiving devices of the error detection simultaneously through a single error signal line. Since the configuration is adopted, it becomes possible to re-transfer for each data in the broadcast transfer, and as a result, the efficiency of data re-transfer is improved.

According to the eleventh aspect of the present invention, when the broadcast data is correctly received by all the data receiving devices, each received data is saved, so that the continuous reception of the broadcast data is properly performed. To be done.

According to the twelfth aspect of the invention, when any of the data receiving devices detects an error in the received data, all the data receiving devices discard the received data. Proper re-reception of broadcast data at is guaranteed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a data transfer device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing an internal structure of the wired OR coupling circuit in FIG.

3 is a flowchart showing the operation of the data transmission device in FIG.

FIG. 4 is a flowchart showing the operation of each of the data receiving devices in FIG.

FIG. 5 is a block diagram showing a system configuration including a plurality of data transfer devices according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a system configuration including a plurality of data transfer devices according to a third embodiment of the present invention.

7 is a block diagram showing the internal structure of the ECC circuit in FIG.

FIG. 8 is a block diagram showing a configuration of a data transfer device according to a fourth embodiment of the present invention.

9 is a circuit diagram showing an internal structure of the error signal line coupling circuit in FIG.

FIG. 10 is a block diagram showing a configuration of a data transfer system according to a fifth embodiment of the present invention.

[Explanation of symbols]

11-14 Internal data bus 15a Re-reception request signal 16 Error judgment signal 17a Error detection signal 20a-20e Error signal line 30a-30c External data bus 40a-40c Re-transmission request signal 50 Pull-up resistor 51 Pull-down resistor 60,61 Internal data Bus 65 Re-reception request signal 66 Error determination signal 67 Error detection signal 100a Data transmission device 102 Transmission control device (transmission control means) 104 Data latch (transmission means) 106 ECC circuit (code addition means) 108 FIFO memory (storage means) 200a Data reception device 202 Reception control device (reception control means) 204 Data latch (reception means) 206 ECC circuit (error checking means) 208 FIFO memory (memory means) 400a Reception board (reception unit) 500a Wired or coupling circuit (connection) Combination means) 510a N-type MOS transistor (driving section) 520a Buffer circuit (input section) 530 Error signal line coupling circuit (integration means) 540 N-type MOS transistor (second switching element) 550 P-type MOS transistor (first) Switching element) 600a Data transfer device 600b Data transfer device 602 Data transfer control device (transmission control means /
Reception control means) 604 Data latch (transmission means / reception means) 606 ECC circuit (code addition means / error check means) 608 FIFO memory (storage means / memory means) 610 Error detection signal output circuit 620 Error correction code addition circuit 630 Error Inspection / correction circuit

Claims (12)

[Claims] 1. A data transmitting device for transmitting broadcast data, and a function of individually receiving the broadcast data transmitted by the data transmitting device and individually inspecting whether or not there is an error in the received data. A data transfer device comprising a plurality of data receiving devices respectively provided, and a single error signal line commonly connected to each of the data transmitting device and the plurality of data receiving devices, wherein the plurality of data When each of the receiving devices detects an error in the received data, the receiving device discards the received data and notifies the data transmitting device and all other data receiving devices of the error detection simultaneously through the error signal line, Further, it further comprises a function of discarding the received data when any of the other data receiving devices is notified of the error detection, When any one of the plurality of data receiving devices is notified of an error in the transmitted broadcast data, the broadcast data is re-received by all of the plurality of data receiving devices. A data transfer device further comprising a function of retransmitting broadcast data. 2. The data transfer device according to claim 1, wherein the data transmission device is for storing storage means for storing data to be transmitted, and for adding an error check code to the data extracted from the storage means. Code adding means, transmitting means for temporarily holding the data to which the error check code is added by the code adding means, and transmitting the data as broadcast data; and the plurality of data regarding the data transmitted by the transmitting means. When any one of the receiving devices is notified of the error detection, it controls the extraction of the data from the storage means so as to prohibit the extraction of the next data, and the data held in the transmission means is A data transfer apparatus comprising: a transmission control unit for controlling the operation of the transmission unit so that the data is retransmitted. 3. The data transfer device according to claim 1, wherein each of the plurality of data receiving devices receives the broadcast data transmitted by the data transmitting device and temporarily holds the received data. An error checking unit for checking whether the received data has an error and outputting an error detection signal when an error is detected; a memory unit for storing the received data; When an error detection signal is output from the means, a reception control for controlling the movement of the reception data from the reception means to the memory means so as to prohibit the storage of the reception data and outputting an error determination signal Means, and when an error determination signal is output from the reception control means, the data transmitter and all other data receivers are notified of the error detection at the same time. Coupling means for driving the error signal line so that the error signal line is driven by any of the other data receiving devices, and for giving a re-reception request signal to the reception control means. When the reception control means receives the re-reception request signal from the combining means, the reception control means prevents the storage of the reception data even when an error detection signal is not output from the error checking means. A data transfer device further comprising a function of controlling movement of received data from the memory means to the memory means. 4. The data transfer device according to claim 3, further comprising a pull-up resistor interposed between the error signal line and the power supply line, wherein coupling means in each of the plurality of data receiving devices comprises: A drive unit for lowering the potential of the error signal line when an error determination signal is output from the reception control unit, and re-reception to the reception control unit when the potential of the error signal line is reduced A data transfer device comprising: an input unit for generating a request signal. 5. The data transfer device according to claim 1, wherein the data transmitting device transmits test data as broadcast data, and the transmitted test data is erroneous from any one of the plurality of data receiving devices. The data transfer device further comprises a function of retransmitting the test data so that the test data is re-received by all of the plurality of data receiving devices when the detection of the test is notified. 6. The data transfer apparatus according to claim 5, wherein the data transmission apparatus has a function of determining that the data transfer apparatus has a permanent failure when the test data is retransmitted a predetermined number of times. A data transfer device further comprising: 7. A data transmitting device for transmitting broadcast data, and a function for individually receiving the broadcast data transmitted by the data transmitting device and individually checking for the presence or absence of an error in the received data. A plurality of data receiving devices provided,
N receiving parts each having a single individual error signal line commonly connected to the plurality of data receiving devices, and n receiving parts respectively connected to the individual error signal lines of each of the n receiving parts. A data transfer device comprising: an unifying means; and a single integrated error signal line commonly connected to the data transmitting device and each of the n integrating means, wherein each of the data receiving devices includes a receiving device. When an error is detected in the data, the received data is discarded and an error is simultaneously detected in the data transmitting device and all other data receiving devices through the individual and integrated error signal lines and the n integrating means. And further including a function of discarding the received data when any of the other data receiving devices is notified of the error detection, the data transmitting device is configured to transmit the broadcast data. If any of the data receiving devices is notified of an error in the received data, the function of retransmitting the broadcast data so that the broadcast data is re-received by all the data receiving devices is provided. A data transfer device further comprising: 8. The data transfer device according to claim 7, wherein each of the n reception units further includes a pull-up resistor interposed between the individual error signal line and a power supply line, In each of the above, when an error is detected in the received data, the drive unit for lowering the potential of the corresponding one individual error signal line and the potential of the corresponding one individual error signal line are lowered. In some cases, the data transfer device further comprises an input unit for generating a re-reception request signal. 9. The data transfer apparatus according to claim 8, further comprising a pull-down resistor interposed between the integrated error signal line and a ground line, wherein each of the n integrating units receives the n receiving signals. A first switching element for raising the potential of the integrated error signal line when the potential of the corresponding one individual error signal line of the individual error signal lines of each section is lowered; A data transfer device comprising: a second switching element for lowering the potential of the corresponding one individual error signal line when the potential of the signal line is raised. 10. A data transfer method for transferring broadcast data from one data transmitting device to a plurality of data receiving devices, the method comprising: transmitting broadcast data from the data transmitting device; and the transmitted broadcast data. A step of individually receiving by the plurality of data receiving devices, a step of individually checking for the presence of an error in the received broadcast data by each of the plurality of data receiving devices, If any one of them detects an error in the received data, simultaneously reporting the error detection to the data transmitting device and all other data receiving devices through a single error signal line, the detected The broadcast data relating to the error of the plurality of data receiving devices As will be received again in the hand,
Retransmitting the broadcast data from the data transmitting device. 11. The data transfer method according to claim 10, wherein when none of the plurality of data receiving devices detects an error in the received data, the received data is received by each of the plurality of data receiving devices. A data transfer method, further comprising a step of storing. 12. The data transfer method according to claim 10, wherein when any of the plurality of data receiving devices detects an error in the received data, the received data is received by all of the plurality of data receiving devices. A data transfer method, further comprising the step of discarding.