JP4735568B2 - Optical transmission device, semiconductor storage device, and information processing device - Google Patents

Description

  The present invention relates to an optical transmission device, a semiconductor storage device, and an information processing device.

  In recent years, with the widespread use of networks such as the Internet and database systems, various data transmissions that perform digital data transmission from the data transmission unit to the data reception unit for the purpose of real-time information browsing and large-capacity data management There is a further demand for devices to increase data transmission speed and improve transmission quality.

  As a method for speeding up data transmission, data transmission using an optical signal can be cited. In data transmission using optical signals, if the communication speed is increased as in the case of data transmission using electrical signals, signal deterioration and attenuation will increase, so transmission quality will not deteriorate. There is a cause of failure such as misalignment of the element and the lifetime of the element.

  In addition, in order to ensure transmission quality, an error correcting code (Error Correcting Code) that enables detection and correction of errors in received data by performing decoding processing on redundant bits added by the data transmitting unit in the data receiving unit. Hereinafter, ECC) is used.

  However, even if ECC is used, there is a limit to the ability to detect and correct errors, and if the data receiving unit detects an error that cannot be corrected, the data transmitting unit is requested to retransmit. In addition, if any of the data transmission systems fails, the function of the data transmission apparatus is completely stopped.

  In order to avoid such a situation, an electrical signal as transmission data is converted into a plurality of optical signals by a plurality of electro-optical conversion units, and transmitted to a data receiving unit via a plurality of optical fibers. An optical transmission system characterized in that a plurality of optical signals are converted from a plurality of optical signals to a plurality of electrical signals by a plurality of optical-electrical converters provided in the circuit, and one output data is obtained by a majority logic circuit. It has been proposed (see Patent Document 1).

  In addition, the optical transmission line connecting the data transmission unit and the data reception unit is divided into two systems, an optical transmission line that is normally used (active system) and an optical transmission line that is used as a backup (standby system), and error detection by parity check Thus, a data transmission apparatus is proposed in which the switching means switches the optical transmission line from the active system to the standby system when the failure detection means detects a failure in the active optical transmission line (Patent Document 2). reference).

JP 1978-74804 A JP 1993-344104

  The object of the present invention is to reduce the size of the data transmission side, detect and correct transmission data errors, and transmit error-free data even if a failure occurs in some transmission paths. It is an object to provide an optical transmission device, a semiconductor storage device, and an information processing device.

  In order to achieve the above object, the present invention provides the following optical transmission device, semiconductor storage device, and information processing device.

[1] An error correction code is added to transmission data by a single error correction code addition unit , transmission data to which the error correction code is added is converted into an optical signal by an electro-optical conversion unit , and a plurality of branched data Data transmission means for transmitting the optical signal as a plurality of optical signals via a transmission line, and a plurality of optical signals transmitted from the data transmission means for converting into a plurality of received data by a plurality of electrical signals An optical-electrical converter, and an error detection / correction unit that performs error detection and correction on the plurality of received data from the plurality of optical-electrical converters by the error correction code and detects an uncorrectable error; a data selecting section for selecting a plurality of single data without uncorrectable errors based on the error detection and correction section uncorrectable error detection result of out of data from said error detection and correction section Wherein the data selection unit, the error uncorrectable error detection correction unit, when continuously occur in any of the plurality of data, the data to which the uncorrectable error occurs in succession A signal notifying that a failure has occurred in the data transmission means or the opto-electric conversion unit, and an error that cannot be corrected by the error detection and correction unit continues to any of the plurality of data. An optical transmission device that outputs a signal that changes a driving condition of the electro-optical conversion unit when it occurs .

[2] An error correction code is added to transmission data by a single error correction code adding unit, the transmission data to which the error correction code is added is converted into an optical signal by an electro-optical conversion unit , and a plurality of branched data Data transmission means for transmitting the optical signal as a plurality of optical signals via a transmission line, and a plurality of optical signals transmitted from the data transmission means for converting into a plurality of received data by a plurality of electrical signals An optical-electrical converter, and an error detection / correction unit that performs error detection and correction on the plurality of received data from the plurality of optical-electrical converters by the error correction code and detects an uncorrectable error; a storage unit that stores the uncorrectable error detection result of the error detecting and correcting unit, the uncorrectable error by the error detection and correction section among the plurality of data from said error detection and correction section Out with selecting one of the data without uncorrectable error based on the result, the data transmission means or the light based on the stored in the storage unit uncorrectable error detection result - the electrical converter A data selection unit that detects a failure, and the data selection unit is unable to correct an error that cannot be corrected by the error detection and correction unit when any of the plurality of data continuously occurs. A signal notifying that a failure has occurred in the data transmission means or the optical-electrical conversion unit related to data in which errors have occurred continuously is output, and errors that cannot be corrected by the error detection and correction unit are An optical transmission device that outputs a signal for changing a driving condition of the electro-optical converter when the data continuously occurs in any of the data .

[3] The data selection unit detects the uncorrectable error without requesting retransmission of data when an error that cannot be corrected by the error detection / correction unit occurs in any of the plurality of data. If one error-free data that cannot be corrected is selected based on the result and an error that cannot be corrected by the error detection and correction unit occurs in any of the plurality of data, the data transmission means The optical transmission apparatus according to [1] or [2], wherein retransmission is requested.

[ 4 ] The optical transmission apparatus according to [1], wherein the electro-optical conversion unit of the data transmission unit is a semiconductor laser having a plurality of light emitting units that output the plurality of optical signals.

[ 5 ] The electro-optical conversion unit of the data transmission unit is a semiconductor laser having one light emitting unit, and the data transmission unit converts the optical signal output from the one light emitting unit to the plurality of optical signals. The optical transmission device according to claim 1, further comprising an optical branching unit that branches and transmits.

[ 6 ] An error correction code is added to the transmission data by a single error correction code addition unit, the transmission data to which the error correction code is added is converted into an optical signal by an electro-optical conversion unit , and a plurality of branched data Data transmission means for transmitting the optical signal as a plurality of optical signals via a transmission line, and a plurality of optical signals transmitted from the data transmission means for converting into a plurality of received data by a plurality of electrical signals An optical-electrical converter, and an error detection / correction unit that performs error detection and correction on the plurality of received data from the plurality of optical-electrical converters by the error correction code and detects an uncorrectable error; , the data selection unit for selecting one data without uncorrectable errors based on the error detecting and correcting unit error uncorrectable detection result of the multiple data from said error detection and correction section , And a semiconductor memory for storing said one data selected by the data selection unit, the data selection unit, uncorrectable errors in said error detecting and correcting unit, continuous in any of the plurality of data A signal notifying that a failure has occurred in the data transmission means or the optical-electrical converter related to the data in which the uncorrectable error has occurred continuously, and the error detection and correction When a non-correctable error occurs in any of the plurality of data continuously, a signal for changing a driving condition of the electro-optical conversion unit is output .

[ 7 ] An error correction code is added to the transmission data by a single error correction code addition unit, the transmission data to which the error correction code is added is converted into an optical signal by an electro-optical conversion unit , and a plurality of branched data Data transmission means for transmitting the optical signal as a plurality of optical signals via a transmission line, and a plurality of optical signals transmitted from the data transmission means for converting into a plurality of received data by a plurality of electrical signals An optical-electrical converter, and an error detection / correction unit that performs error detection and correction on the plurality of received data from the plurality of optical-electrical converters by the error correction code and detects an uncorrectable error; , the data selection section for selecting a plurality of single data without uncorrectable errors based on the error detection and correction section uncorrectable error detection result of out of data from said error detection and correction section , Wherein selected by the data selecting unit and an interface unit which outputs one data to the external, the data selection unit, uncorrectable errors in said error detecting and correcting unit, one of the plurality of data A signal notifying that a failure has occurred in the data transmission means or the opto-electric conversion unit related to the data in which the uncorrectable error has occurred continuously, and the error An information processing apparatus that outputs a signal that changes a driving condition of the electro-optical conversion unit when an error that cannot be corrected by the detection and correction unit continuously occurs in any of the plurality of data .

  According to the data transmission device of the first aspect, it is possible to reduce the size of the data transmission unit, and to detect and correct transmission data errors. Even if a failure occurs in some transmission lines, No data can be transmitted.

  According to the data transmission device of the second aspect, it is possible to reduce the size of the data transmission side, and to detect and correct transmission data errors. Even if a failure occurs in some transmission lines, Not only data can be transmitted, but also the location where the failure occurs can be specified.

According to the data transmission apparatus of the fourth aspect , the configuration of the optical transmission line can be simplified.

According to the data transmission apparatus of the fifth aspect , it is possible to reduce the size of the electro-optical conversion unit.

According to the semiconductor storage device of the sixth aspect , it is possible to reduce the size of the data transmission unit, and to detect and correct transmission data errors. No data can be stored in the semiconductor memory.

According to the information processing apparatus of the seventh aspect , it is possible to reduce the size of the data transmission unit and to detect and correct transmission data errors. Even if a failure occurs in some transmission lines, No data can be output to the interface unit.

[First Embodiment]
FIG. 1 is a block diagram of an optical transmission apparatus according to the first embodiment of the present invention.

(Configuration of optical transmission equipment)
The optical transmission device 1 includes a data transmission unit 2 that converts transmission data input from an upper system through an electric signal via an electric signal 10 into an optical signal, and transmits a plurality of (for example, two) input optical signals. ) And an optical transmission line 3 that branches and transmits, and a data receiving unit 4 that converts a received optical signal into an electrical signal and outputs output data from the signal line 11. The data transmission unit 2 and the optical transmission path 3 constitute a data transmission unit 5.

(Configuration of data transmitter)
The data transmission unit 2 includes an ECC addition unit 20, an E / O conversion unit 21, and a control unit 22.

  The ECC adding unit 20 adds an error correcting code (hereinafter, ECC) to the transmission data from the signal line 10.

  ECC transmits data with redundant bits added to the transmission data, detects whether the received data is correct, and detects errors within a correctable range. This is an encoding technique that enables correction. In the embodiment of the present invention, for example, a known ECC such as a Hamming code or a Reed-Solomon code can be used.

  The E / O conversion unit 21 includes a semiconductor laser 211 that outputs an optical signal from one light emitting unit, and a drive unit 210 that drives the semiconductor laser 211, and an ECC is added by the ECC adding unit 20. The transmission data with ECC is converted from an electrical signal to an optical signal and an optical signal is output.

  The control unit 22 changes the driving condition of the semiconductor laser 211 when receiving a driving condition change signal from the data receiving unit 4 via the signal line 12. Also. When receiving a retransmission request signal from the data receiving unit 4 via the signal line 12, the control unit 22 outputs a retransmission request signal to the higher system via the signal line 14.

  The drive conditions of the semiconductor laser 211 by the control unit 22 are as follows: the first drive condition in the normal state, the second drive condition in which the output light amount of the laser light is increased from the first drive condition, and the second drive condition. The configuration is such that it can be changed in three stages of the third driving condition in which the output light amount of the laser light is increased. However, the driving condition may be the intensity of the output light of the laser beam, the amplitude change of the laser beam, or a combination of these conditions. The driving conditions are not limited to three stages.

(Configuration of optical transmission line)
The optical transmission line 3 includes an optical branching unit 30 and optical fibers 31, 32a, and 32b.

  The E / O converter 21 and the optical branching unit 3 are connected via an optical fiber 31. The optical branching unit 3 and the data receiving unit 4 are connected via two optical fibers 32a and 32b.

  The optical branching unit 30 is configured by a sheet-like optical waveguide (optical sheet bus) and an optical coupler described later. The optical branching unit 30 has a function of branching and outputting the optical signal propagated through the optical fiber 31 to the two optical fibers 32a and 32b.

  FIG. 2A shows a sheet-like optical waveguide (optical sheet bus) 30A. The sheet-like optical waveguide 30A is a sheet-like light guide, and uniformly diffuses the light incident from the optical fiber 31 and emits it from the two optical fibers 32a and 32b. The sheet-like optical waveguide 30A is made of a sheet-like transparent medium having a uniform thickness, and is made of, for example, a plastic material such as polymethyl methacrylate, polycarbonate, amorphous polyolefin, or inorganic glass.

  FIG. 2B shows an optical coupler 30B. The optical coupler 30B is a light guide having a Y-shaped core, branches light incident from the optical fiber 31, and emits the light from the optical fibers 32a and 32b.

(Configuration of data receiver)
The data receiver 4 includes a first O / E converter 40 a, a first ECC decoder 41 a, a second O / E converter 40 b, a second ECC decoder 41 b, a data selector 42, and a register 43. It is configured.

  The first and second O / E converters 40a and 40b receive the optical signals that have passed through the optical fibers 32a and 32b from the optical branching unit 30 by, for example, PIN type photodiodes, and the optical signals are received as electrical signals. Convert to

  The first and second ECC decoding units 41a and 41b respectively receive the reception data with the ECC added to the electrical signal converted by the first and second O / E conversion units 40a and 40b, and decode the ECC. By processing, errors are detected and corrected, and ECC is removed.

  The data selection unit 42 considers the presence or absence of an uncorrectable error detected during the decoding process and the state of the register 43 from the received data sent from the first and second ECC decoding units 41a and 41b, respectively. Select whether to output data from the signal line 11, to output a retransmission request signal from the signal line 12 to the control unit 22, or to output a failure notification signal from the signal line 13 to the upper system. .

  Further, the data selection unit 42 detects an uncorrectable error (first time) in the first and second ECC decoding units 41a and 41b, and an error (second time) that cannot be corrected again in subsequent data transmission. When an error is detected, the first and second error detection intervals are equal to or less than a predetermined interval (including zero), and it is determined that a failure has occurred. In this embodiment, since the predetermined interval is set to 0, it is determined that a failure has occurred when the first and second ECC decoding units 41a and 41b detect an error twice in succession.

  With the above configuration, the optical branching unit 30 and the first and second O / E conversion units 40a are replaced with the O / E conversion unit that is vulnerable to external noise and easily generates a failure among the components of the optical transmission apparatus 1. , 40b makes the optical transmission device more reliable, and sharing the E / O conversion unit 21 reduces the size of the data transmission unit 2.

  The register 43 is a storage unit for storing internal information. The register 43 is divided into 1-bit storage areas that can take either 0 or 1, and information to be stored is assigned to each storage area. I remember.

  Specifically, the register 43 sets the state of whether or not an uncorrectable error has been detected by the first ECC decoding unit 41a in the first storage area (Rx-Reg1) of the register 43, and performs the second ECC decoding. The state of whether or not an uncorrectable error has been detected by the unit 41b is stored in the second storage area (Rx-Reg2) of the register 43, respectively.

  In addition, the register 43 determines whether or not the optical signal from the E / O converter 21 has been transmitted correctly for each of the three stages of driving conditions from the first to the third driving conditions (Tx -Reg1), the fourth storage area (Tx-Reg2) of the register 43, and the fifth storage area (Tx-Reg3) of the register 43, respectively.

  Note that whether or not the optical signal from the E / O conversion unit 21 has been transmitted correctly is determined by simultaneously detecting uncorrectable errors in the first ECC decoding unit 41a and the second ECC decoding unit 41b. ing.

(Overall operation of optical transmission equipment)
Next, the operation of the optical transmission apparatus 1 according to the first embodiment of the present invention will be described.

  In the optical transmission device 1, transmission data is input to the data transmission unit 2 from the host system through an electric signal via the signal line 10. The transmission data is converted from an electrical signal to an optical signal by the E / O conversion unit 21 after the ECC is added by the ECC addition unit 20. The converted optical signal is sent from the E / O converter 21 to the optical transmission line 3.

  In the optical transmission line 3, the optical signal passes through the optical fiber 31 and is branched into optical fibers 32 a and 32 b by the optical branching unit 30. The branched optical signals are transmitted to the first and second O / E converters 40a and 40b, respectively.

  In the data receiving unit 4, the received optical signals are converted into electrical signals by the first and second O / E conversion units 40a and 40b, respectively.

  Since the ECC added to the received data converted into the electrical signal is added by the ECC adding unit 20, the ECC decoding processing is performed by the first and second ECC decoding units 41a and 41b. As a result, if no error is detected in the received data, the redundant bits added for ECC are removed, and then the received data is transmitted to the data selection unit 42. When a correctable error is detected, the received data after being corrected to normal data is transmitted to the data selection unit 42. When an uncorrectable error is detected, the data selection unit 42 is notified that an error has been detected. Therefore, the error-free data includes data for which no error was detected and data for which an error was detected but could be corrected.

(Detailed operation of data selector)
FIG. 3 shows the processing operation in the data selection unit 42.

  First, the received data after the ECC decoding process and the presence / absence of an uncorrectable error are input from the first and second ECC decoding units 41a and 41b to the data selection unit 42 (S101).

  Next, it is determined whether or not an uncorrectable error has been detected by the first ECC decoding unit 41a (S102). If no error is detected by the first ECC decoding unit 41a (S102: No), the received data from the first ECC decoding unit 41a is selected as error-free data (S103). Further, Rx-Reg1 of the register 43 is reset and stored in the normal state from the E / O conversion unit 21 in order to store that the uncorrectable error is not detected by the first ECC decoding unit 41a in this data transmission. The Tx-Reg1 of the register 43 is reset in order to store that the optical signal transmitted under the state driving condition is correctly received (S104).

  When the uncorrectable error is not detected in the second ECC decoding unit 41b (S105: No), the uncorrectable error is not detected in the second ECC decoding unit 41b in the current data transmission. In order to store this, Rx-Reg2 of the register 43 is reset (S106). Subsequently, the data sent from the first ECC decoding unit 41a is output as output data from the signal line 11 (S107).

  When an uncorrectable error is detected in the second ECC decoding unit 41b (S105: Yes), whether or not an uncorrectable error is detected in the second ECC decoding unit 41b in the previous data transmission. The state of Rx-Reg2 storing the state is confirmed (S108).

  If Rx-Reg2 is not set, that is, if the second ECC decoding unit 41b has not detected an error in the previous data transmission (S108: No), after setting Rx-Reg2 (S109), the first The data sent from the ECC decoding unit 41a is selected and outputted as output data from the signal line 11 (S107).

  On the other hand, if Rx-Reg2 is set (S108: Yes), it means that the second ECC decoding unit 41b has continuously detected errors, so that the second O / E from the optical branching unit 30 is detected. A fault notification signal is output from the signal line 13 to the host system on the assumption that some fault has occurred up to the converter 40b (second data receiving system) (S110).

  Subsequently, since no error is detected in the first ECC decoding unit 41a, the data sent from the first ECC decoding unit 41a is selected and output as output data from the signal line 11 (S107).

Here, the reason for determining that a failure has occurred between the optical branching unit 30 and the second O / E conversion unit 40b due to the continuous detection of errors by the second ECC decoding unit 41b is as follows: In an optical transmission apparatus, a data transmission error of about 1 bit occurs normally in 10 ¹² bits statistically, but if such a probability occurs, if an error occurs twice in succession, the optical transmission apparatus This is because it is considered that a failure has occurred in either.

  Next, when an uncorrectable error is detected by the first ECC decoding unit 41a (S102: Yes), it is determined whether or not an uncorrectable error is detected by the second ECC decoding unit 41b. . (S111).

  When an uncorrectable error is not detected in the second ECC decoding unit 41b (S111: No), the data that has reached the second ECC decoding unit 41b is selected as error-free data (S112), Rx-Reg2 and Tx-Reg1 are reset (S113).

  Subsequently, the state of Rx-Reg1 is confirmed (S114). If Rx-Reg1 is not set (S114: No), after Rx-Reg1 is set (S115), the data sent from the second ECC decoding unit 41b is output as output data from the signal line 11 (S107). .

  On the other hand, if Rx-Reg1 is set (S114: Yes), it is assumed that some failure has occurred between the optical branching unit 30 and the first O / E conversion unit 40a (first data receiving system). A failure notification signal is output from the signal line 13 to the host system (S116), the data sent from the second ECC decoding unit 41b is selected and output as output data from the signal line 11 (S107).

  When an uncorrectable error is detected by the first and second ECC decoding units 41a and 41b (S102: Yes, S111: Yes), the state of Tx-Reg1 is confirmed (S117).

  If Tx-Reg1 is not set, that is, if the optical signal is correctly transmitted under the first driving condition in the previous data transmission (S117: No), after setting Tx-Reg1 (S118), the data receiving unit A retransmission request signal is output via the signal line 12 to the control unit 22 provided in 2 (S119). Further, the control unit 22 outputs a retransmission request signal to the higher system via the signal line 14, and requests retransmission of transmission data in which an error is detected by the first and second ECC decoding units 41a and 41b. . At that time, the drive condition of the semiconductor laser 211 remains the first drive condition, and retransmission is attempted without being changed.

  When an uncorrectable error is detected by the first and second ECC decoding units 41a and 41b in the next data transmission by retransmission (S102: Yes, S111: Yes), Tx-Reg1 is set. (S117: Yes), the state of Tx-Reg2 of the register 43 that stores the state of whether or not the optical signal transmitted from the E / O converter 21 under the second drive condition has been correctly received is confirmed. (S120).

  If Tx-Reg2 is not set (S120: No), after setting Tx-Reg2 (S121), the drive condition is set so that the drive condition of the semiconductor laser 211 is changed to the second drive condition with respect to the control unit 22. A change signal is output (S122). Subsequently, in order to request retransmission under the second drive condition, a retransmission request signal is output to the control unit 22 (S119).

  In the next data transmission, the semiconductor laser 211 is retransmitted under the second driving condition. If an error that cannot be corrected is still detected by the first and second ECC decoding units 41a and 41b (S102: Yes, S111: Yes), and Tx-Reg1 and Tx-Reg2 are set (S117: Yes, S120: Yes), the register that stores the driving condition of the semiconductor laser 211 in the state relating to the third driving condition The state of Tx-Reg3 of 43 is confirmed (S123).

  If Tx-Reg3 is not set (S123: No), after setting Tx-Reg3 (S124), the drive condition is set so that the drive condition of the semiconductor laser 211 is changed to the third drive condition with respect to the control unit 22. A change signal is output (S125). Subsequently, in order to request retransmission under the third driving condition, a retransmission request signal is output to the control unit 22 (S119).

  In the next data transmission, the semiconductor laser 211 is retransmitted under the third driving condition. However, if an error that cannot be corrected is still detected by the first and second ECC decoding units 41a and 41b (S102: Yes, S111: Yes), Tx-Reg1, Tx-Reg2, and Tx-Reg3 are set (S117: Yes, S120: Yes, S123: Yes). For this reason, since the error was not resolved even if retransmission was performed by changing the driving condition of the semiconductor laser 211 to the first to third driving conditions, the interval between the E / O conversion unit 21 and the optical branching unit 30 was If a failure occurs in the (data transmission system), a failure notification signal is output to the host system via the signal line 13 (S126), and data transmission is stopped (S127).

  In this way, by changing the driving condition of the semiconductor laser 211 stepwise from the first driving condition to the second and third driving conditions, for example, the deterioration of the semiconductor laser can be cited as a cause of data transmission failure. In this case, increasing the amount of light output from the semiconductor laser 211 results in extending the period until the failure of the optical transmission apparatus.

[Second Embodiment]
FIG. 4 is a block diagram of an optical transmission apparatus according to the second embodiment of the present invention.

  In the second embodiment, the E / O conversion unit 21 constituting the data transmission unit 2 includes a driving unit 210 and a surface emitting semiconductor laser 212, and is a surface emitting type driven by the driving unit 210. The semiconductor laser 212 includes a plurality of light emitting points in one device, and can generate a plurality of optical signals from one electric signal. By connecting optical fibers to the plurality of light emitting points, a plurality of optical signals converted from electrical signals can be simultaneously output from a plurality of light emitting units.

  Therefore, compared with the first embodiment, in the second embodiment, the optical branching section 30 and the optical fiber 31 constituting the optical transmission line 3 are omitted, and the other configurations and operations are the first. This is the same as the embodiment.

[Third Embodiment]
FIG. 5 is a block diagram of a semiconductor storage device according to the third embodiment of the present invention.

(Configuration of semiconductor storage device)
The semiconductor storage device 6 is connected to a host device 7 composed of a server or the like via a serial interface 70.

  The semiconductor storage device 6 includes a main controller 60 as a control unit that controls the inside of the device, and an external interface unit (external I / F unit) that transmits and receives signals to and from the host device 7 under the control of the main controller 60. ) 61, the data transmission unit 2 connected to the main controller 60 through the signal line 10 and converted to an optical signal and transmitted as transmission data, and the data transmission unit 2 through the optical fiber 31. A connected optical branching unit 30, a data receiving unit 4 connected to the optical branching unit 30 via optical fibers 32a and 32b, a memory controller 62 connected to the data receiving unit 4 via the signal line 11, A semiconductor memory 63 connected to the memory controller 62 via the memory bus 16, and a failure notification unit 64 connected to the main controller 60. Ete is configured.

  In FIG. 5, the data transmission unit 2, the optical fiber 31, the optical branching unit 30, and the optical fibers 32 a and 32 b constitute an optical transmission unit 5.

  The data transmission unit 2 corresponds to the data transmission unit 2 of the first embodiment, and the data reception unit 4 corresponds to the data reception unit 4 of the first embodiment. Therefore, those descriptions are omitted.

  Further, the semiconductor storage device 6 connects the downstream direction from the main controller 60 to the memory controller 62 and the upstream direction from the memory controller 62 to the main controller 60 by a multi-bit transmission system, and transmits these multiple bits. In FIG. 5, the signal line 10, the optical transmission means 5, and the data receiving unit 4, which are one bit of the multiple-bit downlink transmission system, are illustrated. Then, the signal line 15 which is one bit of the multiple-bit upstream transmission system is described, and the other downstream and upstream transmission systems are omitted.

  The main controller 60 includes a CPU, a ROM that stores programs, a memory 60a that temporarily holds transmission data, and the like. In addition, a signal requesting retransmission of data, a signal requesting a change in the driving condition of the E / O converter 21, an initialization signal, and the like are transmitted to the main controller 60 from the data receiving unit 4. Is connected to the signal line 12.

  The external I / F unit 61 includes a circuit for executing communication with the host device 7 by a predetermined communication method.

  The optical branching unit 30 includes a sheet-like optical waveguide 30A that branches an optical signal incident through the optical fiber 31 into two and outputs the optical signal from the optical fibers 32a and 32b.

The memory controller 62 includes circuits that control writing and reading of data to and from the semiconductor memory 63. The memory controller 62 includes a circuit that receives data from the data receiving unit 4 via the signal line 11 and transmits data read from the semiconductor memory 63 to the main controller 60 via the signal line 15.

  The semiconductor memory 63 includes a volatile semiconductor memory such as a DRAM or a nonvolatile semiconductor memory such as a flash memory, and data is written and read via the memory controller 62.

  The failure notification unit 64 may perform visual display using a lighting circuit such as an LED lamp or a display circuit that displays characters such as a message on a display, or an acoustic circuit that emits an alarm sound, a melody, a voice message, or the like from a speaker. An audible display may be performed using. Further, both visible display and audible display may be performed.

(Operation of semiconductor storage device)
Next, the operation of the semiconductor storage device 6 according to the third embodiment will be described.

  In the semiconductor storage device 6, when data transmission is requested from the host device 7, the main controller 60 receives this transmission request via the external I / F unit 61.

  When the main controller 60 confirms the transmission request, the main controller 60 temporarily holds the transmission data from the host device 7 in the memory 60a, and then outputs the transmission data as an electrical signal to the data transmission unit 2 via the signal line 10.

  The transmission data input to the data transmission unit 2 is added with ECC by the ECC addition unit 20 provided in the data transmission unit 2, and then converted from an electric signal to an optical signal by the E / O conversion unit 21, and the storage destination address It is transmitted to the optical fiber 31 together with the information. The optical signal propagated through the optical fiber 31 is branched into optical fibers 32 a and 32 b by the optical branching unit 30.

  The optical signals propagated through the optical fibers 32a and 32b are received by the first and second O / E converters 40a and 40b provided in the data receiver 4, respectively.

  The optical signals received by the O / E converters 40a and 40b are converted into electric signals, and then the corresponding ECC decoders 41a and 41b detect and correct errors by ECC decoding processing, respectively. Is removed.

  If no uncorrectable error is detected as a result of the ECC decoding process, data is transmitted from the data selection unit 42 to the memory controller 62 corresponding to the designated address. The memory controller 62 receives transmission data addressed to itself and writes it in the semiconductor memory 63.

  When the main controller 60 is notified by the data selection unit 42 that data transmission has been normally performed, the main controller 60 notifies the host device 7 via the external I / F unit 61 and erases the transmission data in the memory 60a. Then, the process proceeds to the next data transmission process.

(Operation when failure is detected)
Next, an operation in the case where an error that cannot be corrected is detected by the ECC decoding processing in the ECC decoding units 41a and 41b will be described.

  When the first ECC decoding unit 41a detects an uncorrectable error twice in succession, it is between the optical branching unit 30 and the first O / E conversion unit 40a (first data receiving system). As a failure has occurred, a failure notification signal is sent from the data selection unit 42 to the main controller 60 via the signal line 12. Upon receiving this signal, the main controller 60 notifies the failure of the first O / E conversion unit 40a by the failure notification unit 64, and based on this notification, the user performs maintenance and inspection of the first O / E conversion unit 40a. Etc. The ECC decoding unit 41b also notifies of the occurrence of a failure by the same process.

  In addition, when an uncorrectable error is detected twice in succession in both the first and second ECC decoding units 41a and 41b, data is transferred from the data selection unit 42 to the main controller 60 via the signal line 12. A retransmission request signal requesting retransmission is sent. Receiving this signal, the main controller 60 retransmits the transmission data stored in the memory 60a.

  Further, when an uncorrectable error is detected twice in both the first and second ECC decoding units 41a and 41b in the next data transmission, the main data is sent from the data selection unit 42 via the signal line 12. A drive condition change signal is sent to the controller 60 to change the drive condition of the E / O converter 21. Upon receiving this signal, the main controller 60 outputs a command to the control unit 22 to change the driving condition of the E / O conversion unit 21 via the signal line 13, and then stores the command in the memory 60a. Resend transmitted data.

  If the error is not resolved by the data selection unit even if the drive conditions of the E / O conversion unit 21 are changed in stages, the interval between the E / O conversion unit 21 and the optical branching unit 30 (data transmission system) Therefore, a failure notification signal is sent from the data selection unit 42 to the main controller 60 via the signal line 12. Upon receiving this signal, the main controller 60 notifies the failure between the E / O conversion unit 21 and the optical branching unit 30 by the failure notification unit 64, and the user sends the signal from the E / O conversion unit 21 based on this notification. Carry out maintenance and inspection up to the optical branching section 30.

[Fourth Embodiment]
FIG. 6 is a block diagram of an information processing apparatus according to the fourth embodiment of the present invention.

(Configuration of information processing device)
The information processing apparatus 8 has expansion slots (interface units) 84a and 84b that comply with a serial data transfer interface standard such as PCI Express (registered trademark). An expansion card having various functions such as a network card or a graphics card can be inserted into the expansion slots 84a and 84b, and a storage device such as the semiconductor storage device 7 can also be connected thereto.

  The information processing device 8 includes a CPU 81 that performs arithmetic processing, a memory 82 that stores data and programs, a main controller 80 that manages data transfer between the CPU 81 and the memory 82, and performs PCI Express bus control. The data transmitters 2a and 2b that are connected to the main controller 80 via the signal lines 10a and 10b and convert the electrical signals sent as transmission data into optical signals and transmit the data, and data transmission via the optical fibers 31a and 31b The optical branching sections 30a and 30b connected to the sections 2a and 2b, the data receiving sections 4a and 4b connected to the optical branching sections 30a and 30b via the optical fibers 32a to 32d, and the signal lines 11a and 11b, respectively. Expansion slot controllers 83a and 83b connected to the data receiving units 4a and 4b, and an expansion slot controller Controller 83a, expansion slot (interface unit) which is connected to the 84b 84a, and is configured and a 84b.

  Further, the main controller 80 includes an input device 85 that receives an instruction and data input from the user to the information processing device 8, and an output device 86 that is connected to the main controller 80 and displays a processing result of the information processing device 8. It is connected.

  In FIG. 6, the data transmission unit 2a, the optical fiber 31a, the optical branching unit 30a, and the optical fibers 32a and 32b constitute an optical transmission means 5a. The data transmission unit 2b, the optical fiber 31b, the optical branching unit 30b, and the optical fibers 32c and 32d constitute an optical transmission unit 5b.

  The data transmission units 2a and 2b correspond to the data transmission unit 2 of the first embodiment, and the data reception units 4a and 4b correspond to the data reception unit 4 of the first embodiment. The optical branching units 30a and 30b correspond to the optical branching unit 30 of the first embodiment. Therefore, those descriptions are omitted.

  The information processing apparatus 8 uses a multi-bit transmission system in both the downstream direction from the main controller 60 to the expansion slot controllers 83a and 83b and the upstream direction from the expansion slot controllers 83a and 83b to the main controller 60. It is configured to connect and perform data transmission via these multi-bit transmission systems.

  However, FIG. 6 shows the signal line 10a, the optical transmission means 5a, and the data receiving unit 4a, which are one bit in the transmission system of the plurality of bits in the downstream direction with the expansion slot controller 83a, and the expansion slot controller 83a. The signal line 15a, which is one bit of the multiple-bit upstream transmission system between them, is described, and the other downstream and upstream transmission systems are omitted. In FIG. 6, the signal line 10b, the optical transmission means 5b, and the data receiving unit 4b, which are one bit in the transmission system in the downlink direction of a plurality of bits with the expansion slot controller 83b, are described, and the expansion slot controller 83b The signal line 15b, which is one bit of the multiple-bit upstream transmission system between them, is described, and the other downstream and upstream transmission systems are omitted.

  The main controller 80 includes a circuit for managing the data transfer between the CPU 81 and the memory 82 and controlling the PCI Express bus, and controlling the input device 85 and the output device 86. In addition, the main controller 80 is a signal that transmits a signal requesting retransmission of data or a change in the driving conditions of the E / O converters 21a and 21b, an initialization signal, and the like between the data receivers 4a and 4b. Lines 12a and 12b are connected to each other.

  The expansion slot controllers 83a and 83b include circuits that control data transfer with the expansion cards 9a and 9b inserted into the expansion slots 84a and 84b. The expansion slot controllers 83a and 83b receive data from the data receivers 4a and 4b via the signal lines 11a and 11b, and receive data received from the expansion cards 9a and 9b via the signal lines 15a and 15b. A circuit for transmitting to the controller 80 is provided.

  The input device 85 is a pointing device typified by a keyboard, a mouse, or a touch panel, and commands and data from the user are input to the information processing device 8.

  The output device 86 is a display, a printer, or the like, and the processing result of the information processing device 8 is transmitted to the user.

(Operation of information processing device)
Next, the operation of the information processing apparatus 8 according to the fourth embodiment will be described.

  The information processing apparatus 8 receives a command from the user via the input device 85. The main controller 80 that has received the command interprets the command as a processing operation in the information processing apparatus 8 such as transmitting data stored in a predetermined address of the memory 82 to the expansion card 9a. The processing operation when data is transmitted to the expansion card 9a will be described below, but the same processing operation is performed when data is transmitted to the expansion card 9b.

  Then, the main controller 80 outputs data stored at a predetermined address in the memory 82 to the data transmission unit 2a via the signal line 10a.

  The subsequent data transmission operation from the data transmission unit 2a to the data reception unit 4a is the same as the data transmission operation from the data transmission unit 2 to the data reception unit 4 in the first embodiment.

  If an uncorrectable error is not detected as a result of the ECC decoding process by the first and second ECC decoding units 41a and 41b, the data selection unit 42a sends data to the expansion slot controller 83a, and the expansion slot controller The data is sent to the expansion card via the expansion slot 84a.

  The main controller 80 notifies the user of the processing result via the output device 86 when notified by the signal line 12a that data transmission has been normally performed from the data selection units 42a and 42b.

(Operation when failure is detected)
Next, an operation when an error that cannot be corrected is detected by the ECC decoding processing in the ECC decoding units 41a to 41b will be described.

  When the first ECC decoding unit 41a detects an uncorrectable error twice in succession, it is between the optical branching unit 30a and the first O / E conversion unit 40a (first data receiving system). As a failure occurs, a failure notification signal is sent from the data selection unit 42a to the main controller 80 via the signal line 12a. Upon receiving this signal, the main controller 80 notifies the failure of the first O / E conversion unit 40a by the output device 86, and based on this notification, the user performs maintenance inspection of the first O / E conversion unit 40a, etc. To implement. The ECC decoding unit 41b also notifies of the occurrence of a failure by the same process.

  In addition, when an uncorrectable error is detected twice in succession in both the first and second ECC decoding units 41a and 41b, data is transferred from the data selection unit 42a to the main controller 80 via the signal line 12a. A retransmission request signal requesting retransmission is sent. Upon receiving this signal, the main controller 80 retransmits the data stored in the memory 82.

  Further, when an uncorrectable error is detected twice in both the first and second ECC decoding units 41a and 41b in the next data transmission, the main data is sent from the data selection unit 42a via the signal line 12a. A drive condition change signal is sent to the controller 80 to change the drive condition of the E / O converter 21a. Upon receiving this signal, the main controller 80 outputs a command for changing the driving condition of the E / O conversion unit 21a to the control unit 22 via the signal line 13a, and then the transmission stored in the memory 82. Resend data.

  If the error is not resolved by the data selection unit even if the drive conditions of the E / O conversion unit 21a are changed in stages, the interval from the E / O conversion unit 21a to the optical branching unit 30a (data transmission system) Thus, a failure notification signal is sent from the data selection unit 42a to the main controller 80 via the signal line 12a. Upon receiving this signal, the main controller 80 notifies the failure of the E / O conversion unit 21a by the output device 86, and based on this notification, the user performs maintenance and inspection of the E / O conversion unit 21a.

[Other embodiments]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. In addition, the constituent elements of the above embodiments can be arbitrarily combined without departing from the scope of the present invention.

FIG. 1 is a block diagram of an optical transmission apparatus according to the first embodiment of the present invention. 2A and 2B show an optical branching section according to the first embodiment of the present invention, in which FIG. 2A is a sectional view of a sheet-like optical waveguide, and FIG. 2B is a sectional view of an optical coupler. FIG. 3 is a flowchart showing processing in the data selection unit of the optical transmission apparatus according to the first embodiment of the present invention. FIG. 4 is a block diagram of an optical transmission apparatus according to the second embodiment of the present invention. FIG. 5 is a block diagram of a semiconductor storage device according to the third embodiment of the present invention. FIG. 6 is a block diagram of an information processing apparatus according to the fourth embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical transmission apparatus 2, 2a, 2b Data transmission part 3 Optical transmission path 4, 4a, 4b Data receiving part 5, 5a, 5b Data transmission means 6 Semiconductor storage apparatus 7 Host apparatus 8 Information processing apparatus 9a, 9b Expansion card 10 15, 11a, 11b, 12a, 12b, 15a, 15b Signal line 16 Memory bus 20, 20a, 20b ECC addition unit 21, 21a, 21b E / O conversion unit 22, 22a, 22b Control unit 30, 30a, 30b Optical branching Part 30A Sheet-like optical waveguide 30B Optical coupler 31, 32a to 32d Optical fibers 40a, 40c First O / E converters 40b, 40d Second O / E converters 41a, 41c First ECC decoders 41b, 41d Second ECC decoding unit 42, 42a, 42b Data selection unit 43, 43a, 43b Register 60 Main controller 61 Outside Interface (external I / F unit)
62 Memory controller 63 Semiconductor memory 64 Fault notification unit 80 Main controller 81 CPU
82 Memory 83a, 83b Expansion slot controller 84a, 84b Expansion slot 85 Input device 86 Output device 210 Drive unit 211 Semiconductor laser 212 Surface emitting semiconductor laser

Claims (7)

An error correction code is added to the transmission data by a single error correction code addition unit, the transmission data to which the error correction code is added is converted into an optical signal by an electro-optical conversion unit , and a plurality of branched transmission lines are connected. Via the data transmission means for transmitting the optical signal as a plurality of optical signals,
A plurality of optical-electrical converters for converting the plurality of optical signals transmitted from the data transmission means into a plurality of received data by a plurality of electrical signals;
Wherein the plurality of light - performs error detection and correction the plurality of received data by the error correction code from the electrical converter, and the error detection and correction unit for detecting an uncorrectable error,
A data selection unit that selects one data having no uncorrectable error based on an error detection result uncorrectable by the error detection and correction unit among a plurality of data from the error detection and correction unit;
When the error that cannot be corrected by the error detection and correction unit is continuously generated in any of the plurality of data, the data selection unit is related to the data in which the uncorrectable error is continuously generated. Outputs a signal notifying that a failure has occurred in the data transmission means or the photoelectric conversion unit, and an error that cannot be corrected by the error detection / correction unit has continuously occurred in any of the plurality of data In the case, the optical transmission device outputs a signal for changing a driving condition of the electro-optical conversion unit . An error correction code is added to the transmission data by a single error correction code addition unit, the transmission data to which the error correction code is added is converted into an optical signal by an electro-optical conversion unit , and a plurality of branched transmission lines are connected. Via the data transmission means for transmitting the optical signal as a plurality of optical signals,
A plurality of optical-electrical converters for converting the plurality of optical signals transmitted from the data transmission means into a plurality of received data by a plurality of electrical signals;
Wherein the plurality of light - performs error detection and correction the plurality of received data by the error correction code from the electrical converter, and the error detection and correction unit for detecting an uncorrectable error,
A storage unit that stores the uncorrectable error detection result of the error detection and correction section,
Thereby selecting a plurality of single data without uncorrectable error on the basis of the uncorrectable error detection result of the error detection and correction section of the data from said error detecting and correcting unit, stored in the storage unit wherein on the basis of the uncorrectable error detection result data transmission means or the light has - a data selection unit that detects a failure of the electrical converter,
When the error that cannot be corrected by the error detection and correction unit is continuously generated in any of the plurality of data, the data selection unit is related to the data in which the uncorrectable error is continuously generated. Outputs a signal notifying that a failure has occurred in the data transmission means or the photoelectric conversion unit, and an error that cannot be corrected by the error detection / correction unit has continuously occurred in any of the plurality of data In the case, the optical transmission device outputs a signal for changing a driving condition of the electro-optical conversion unit . When the error that cannot be corrected by the error detection and correction unit occurs in any of the plurality of data, the data selection unit does not request data retransmission, and based on the error correction result that cannot be corrected If there is an uncorrectable error in any of the plurality of data, the data transmission means is requested to retransmit the data. The optical transmission device according to claim 1, wherein the optical transmission device is an optical transmission device. Wherein the electrical data transmission means - optical conversion unit, the optical transmission apparatus according to claim 1 or 2, characterized in that a semiconductor laser having a plurality of light-emitting section for outputting a plurality of optical signals. The electro-optical conversion unit of the data transmission unit is a semiconductor laser having one light emitting unit, and the data transmission unit branches an optical signal output from the one light emitting unit into the plurality of optical signals. the optical transmission device according to claim 1 or 2, characterized in that it comprises a light branching section that transmits Te. An error correction code is added to the transmission data by a single error correction code addition unit, the transmission data to which the error correction code is added is converted into an optical signal by an electro-optical conversion unit , and a plurality of branched transmission lines are connected. Via the data transmission means for transmitting the optical signal as a plurality of optical signals,
A plurality of optical-electrical converters for converting the plurality of optical signals transmitted from the data transmission means into a plurality of received data by a plurality of electrical signals;
Wherein the plurality of light - performs error detection and correction the plurality of received data by the error correction code from the electrical converter, and the error detection and correction unit for detecting an uncorrectable error,
A data selector for selecting one data without uncorrectable errors based on the error uncorrectable detection result of the error detection and correction section among the plurality of data from said error detection and correction section,
A semiconductor memory for storing the one data selected by the data selection unit ,
When the error that cannot be corrected by the error detection and correction unit is continuously generated in any of the plurality of data, the data selection unit is related to the data in which the uncorrectable error is continuously generated. Outputs a signal notifying that a failure has occurred in the data transmission means or the photoelectric conversion unit, and an error that cannot be corrected by the error detection / correction unit has continuously occurred in any of the plurality of data In this case, the semiconductor storage device outputs a signal for changing a driving condition of the electro-optical converter . An error correction code is added to the transmission data by a single error correction code addition unit, the transmission data to which the error correction code is added is converted into an optical signal by an electro-optical conversion unit , and a plurality of branched transmission lines are connected. Via the data transmission means for transmitting the optical signal as a plurality of optical signals,
A plurality of optical-electrical converters for converting the plurality of optical signals transmitted from the data transmission means into a plurality of received data by a plurality of electrical signals;
Wherein the plurality of light - performs error detection and correction the plurality of received data by the error correction code from the electrical converter, and the error detection and correction unit for detecting an uncorrectable error,
A data selector for selecting a plurality of single data without uncorrectable errors based on the error detection and correction section uncorrectable error detection result of out of data from said error detection and correction section,
An interface unit for outputting the one data selected by the data selection unit to the outside ,
When the error that cannot be corrected by the error detection and correction unit is continuously generated in any of the plurality of data, the data selection unit is related to the data in which the uncorrectable error is continuously generated. Outputs a signal notifying that a failure has occurred in the data transmission means or the photoelectric conversion unit, and an error that cannot be corrected by the error detection / correction unit has continuously occurred in any of the plurality of data In the case, the information processing apparatus outputs a signal for changing a driving condition of the electro-optical conversion unit .

Images