JP4485429B2 - Data receiving apparatus, data transmitting apparatus, data transfer system, program, and computer-readable recording medium - Google Patents

Description

  The present invention relates to a data receiving device, a data transmitting device, and a data transfer system including these two devices for transmitting / receiving digital data transferred between, for example, semiconductor integrated circuits and communication terminal devices. The present invention also relates to a program used for the data receiving apparatus and a computer-readable recording medium on which the program is recorded.

  Electronic devices represented by recent personal computers, PDAs (Personal Digital Assistants), and mobile phones are required to have high functionality or high speed processing. Accordingly, there is an increasing demand for increasing the data transfer speed between a plurality of semiconductor integrated circuits mounted on electronic devices. As an interface between semiconductor integrated circuits, a serial interface represented by SPI (Serial Peripheral Interface), UART (Universal Asynchronous Receiver / Transmitter), I2C (Inter-Integrated Circuit) and CPU (Central) and Uit An 8-bit or 16-bit parallel interface to be connected is used.

  With these conventional interfaces, data errors are not allowed, and it is assumed that the data on the sending side and the data on the receiving side are completely the same. An upper speed limit is determined. In the above conventional interface, the transfer rate takes a fixed value, and when the electronic device is designed, a data error occurs even in the worst data transfer environment such as a low temperature state or a high temperature state. Determined to the extent that it does not occur. Therefore, during normal use, the semiconductor integrated circuit is capable of transferring data at a low transfer speed, although it can transfer data at high speed.

On the other hand, Patent Document 1 describes an electronic circuit device capable of operating a CPU at the highest frequency that can be used in an actual use environment. In this electronic circuit device, in order to determine the operating frequency after testing how high the CPU operates normally after the power is turned on, the frequency is higher than the maximum frequency determined by the manufacturer when designing the electronic circuit device. It becomes possible to operate the CPU. Thereby, the data transfer speed between the CPU and the semiconductor integrated circuit can be increased.
Japanese Patent Laid-Open No. 9-26894 (published January 28, 1997)

  However, the electronic circuit device described in Patent Document 1 has the following problems. In the electronic circuit device described in Patent Document 1, it is determined whether or not all the commands executed by the CPU are operating normally depending on whether or not an error has occurred. Therefore, the technique of Patent Document 1 can be applied only to an electronic circuit device that is based on the assumption that no data error occurs during data transfer. Some digital data transferred in an electronic circuit device may be acceptable if there is a certain amount of data error such as audio data, image data, and video data. Therefore, a data transfer system capable of adjusting the data transfer rate while allowing a certain amount of data error has been desired.

  In the electronic circuit device described in Patent Document 1, the maximum operating frequency of the CPU is determined when the power is turned on. However, the temperature of the electronic circuit device is higher in the latter when the power is turned on and during continuous use. Therefore, even if the frequency is operating at the time of power-on, there is a possibility that it does not operate normally due to heat generated during the operation of the electronic circuit device.

  The present invention has been made in view of the above problems, and an object of the present invention is to realize a data transfer system capable of adjusting a data transfer rate while allowing a certain amount of data error.

  A data receiving apparatus according to the present invention is a data receiving apparatus that receives digital data transmitted from a data transmitting apparatus at an adjustable data transfer rate. In order to solve the above-described problem, the data receiving apparatus includes: A first receiving unit that receives digital data and error calculation transmission data transmitted at a data transfer rate, and the first reception unit that is transmitted from the data transmission device at a transfer rate with guaranteed data quality. A second reception unit that receives error calculation transmission data having the same content as the error calculation transmission data transmitted to the unit, and the error calculation transmission data transmitted from the data transmission device at the data transfer rate. The first error calculation reception data obtained by the reception of the first reception unit and the data transmission device are transmitted at a transfer rate that guarantees the data quality. The error calculation transmission data is compared with the second error calculation reception data obtained by the second reception unit receiving the error calculation transmission data, and the difference in data between the two error calculation reception data is incorrect. Based on the error degree calculated by the error calculating unit, an error calculating means for calculating the degree and a transfer rate control instruction signal for instructing the data transmitting apparatus to adjust the data transfer rate. An instruction signal transmission unit for transmission.

  According to the above configuration, the error calculation transmission data transferred to the second receiving unit is transferred at a transfer rate that guarantees the quality of the data, so that no data error occurs during the transfer. Therefore, the error calculation reception data obtained by receiving this can be used as reference data for the error calculation reception data received by the first reception unit.

  The error calculation means compares the error calculation reception data obtained by the first reception unit with the reference error rate calculation reception data obtained by the second reception unit, thereby The degree of error that occurs during transfer to the receiving unit 1 is calculated. Subsequently, on the basis of the error degree, the instruction signal transmission unit transmits a signal instructing to adjust the transfer rate (data transfer rate) of the digital data to the first reception unit, thereby the data transfer rate. Is adjusted appropriately.

  As described above, the data receiving apparatus of the present invention includes the first and second receiving units, and receives normal digital data and error calculation data transferred at an adjustable transfer rate. And the other is a receiving unit for receiving reference error calculation data. Thereby, it is possible to calculate an error that occurs during transfer of digital data and adjust the transfer rate of the digital data based on the calculated error. In other words, the data transfer rate can be adjusted while allowing a certain amount of data error.

  A data receiving apparatus according to the present invention is a data receiving apparatus that receives digital data transmitted from a data transmitting apparatus at an adjustable data transfer rate, and in order to solve the above problem, from the data transmitting apparatus, Digital data and error calculation transmission data transmitted at the data transfer rate, and the same content as the error calculation transmission data transmitted at the data transfer rate at which the data quality is guaranteed. A receiving unit that receives error calculation transmission data, and a first error calculation reception obtained when the receiving unit receives error calculation transmission data transmitted from the data transmission device at the data transfer speed. The receiving unit receives the data and the error calculation transmission data transmitted from the data transmission device at a transfer rate at which the data quality is guaranteed. The error calculation means for comparing the second error calculation reception data obtained by the above, and calculating the degree of data difference between the two error calculation reception data as the error degree, and An instruction signal transmitter that transmits a transfer rate control instruction signal for instructing to adjust the data transfer rate based on the error degree calculated by the error calculator; .

  According to the above configuration, the error calculation transmission data transferred at a transfer rate in which the quality of data is guaranteed does not cause a data error during the transfer. Therefore, the error calculation reception data obtained by receiving this is used as reference data for the error calculation reception data obtained by receiving the error calculation transmission data transferred at an adjustable data transfer rate. be able to.

  The error calculation means adjusts the error calculation reception data obtained by receiving the error calculation transmission data transferred at the adjustable data transfer speed by comparing the error calculation reception data with the reference error calculation reception data. Calculates the degree of error that occurs during transfer at a possible data transfer rate. Subsequently, the data transfer speed is appropriately adjusted by transmitting a signal for instructing the data transmission speed to be adjusted by the instruction signal transmitter based on the error degree.

  As described above, the data receiving apparatus of the present invention receives normal digital data and error calculation transmission data transferred at an adjustable transfer rate, while transferring the data at a transfer rate with guaranteed data quality. A receiving unit for receiving the reference error calculation transmission data. Thereby, it is possible to calculate an error that occurs during transfer of digital data and adjust the transfer rate of the digital data based on the calculated error. In other words, the data transfer rate can be adjusted while allowing a certain amount of data error.

  Also, digital data and error calculation transmission data transmitted from the data transmission device at the data transfer rate, and error calculation transmission data transmitted from the data transmission device at a transfer rate that guarantees data quality; Are preferably multiplexed.

  According to the above configuration, the receiving unit can receive the error calculation transmission data transmitted at both the data transfer rate and the transfer rate at which the data quality is guaranteed.

  Further, the receiving unit intermittently receives a plurality of error calculation transmission data from the data transmission device, and the error calculation means is configured to receive the first error calculation data based on the error calculation transmission data for each error calculation transmission data. The error calculation reception data and the second error calculation reception data are compared to calculate an error degree, and the error degree calculated for each error calculation transmission data is accumulated. Preferably, the transfer rate control instruction signal is transmitted based on the error degree accumulated by the error calculation means.

  According to the above configuration, when calculating the error level, it is possible to calculate an average error level considering the error levels before and after the error level. Therefore, it is possible to reduce the influence of variation in the error level that occurs instantaneously.

  Further, digital data and error calculation transmission data transmitted from the data transmission device at the data transfer speed are added with error correction code data for correcting bit errors occurring during the transfer of the data. An error that corrects the received digital data and the error calculation reception data obtained by receiving the digital data and the error calculation transmission data transmitted at the data transfer speed based on the error correction code data. Preferably, a correction unit is further provided, and the error calculation unit calculates the error degree using the error calculation reception data corrected by the error correction unit as the first error calculation reception data.

  According to the above configuration, the data error generated during the transfer is corrected by the error correction code, so that the data transfer with less data error can be performed as compared with the configuration not using the error correction code. Alternatively, when data errors are allowed with the same degree, the data transfer speed can be increased.

  A data transmitting apparatus according to the present invention is a data transmitting apparatus that transmits digital data at an adjustable data transfer rate to the data receiving apparatus. In order to solve the above problems, the data transmitting apparatus A first transmitter for transmitting digital data and error calculation transmission data at the data transfer rate, and the same content as the error calculation transmission data transmitted from the first transmitter to the data receiver The error calculation transmission data is calculated on the basis of the second transmission unit that transmits the data at a transfer rate that guarantees the data quality, and the error calculation transmission data transmitted from the first and second transmission units. An instruction signal receiving unit that receives a transfer rate control instruction signal for instructing to adjust the data transfer rate, transmitted from the data receiving device based on the error degree; and Based on the transfer speed control instruction signal 示信 No. receiving unit receives, characterized in that it and a transfer rate control section for controlling the data transfer rate of the first transmission unit.

  According to the above configuration, the data transmission apparatus transmits the error calculation transmission data for measuring the error degree to the data reception apparatus at the data transfer rate used when transmitting the normal digital data. The first transmission unit and the second transmission unit for transmitting at a transfer rate that guarantees the quality of data being transferred are provided.

  Therefore, the data receiving apparatus measures the data error occurring in the error calculation transmission data transmitted from the first transmission unit, using the error calculation transmission data transmitted from the second transmission unit as reference data. Will be able to. Then, the transfer rate control unit controls the data transfer rate based on the transfer rate control instruction signal transmitted from the data receiving device based on the error degree, so the digital data transfer rate is adjusted based on the calculated error. can do. In other words, the data transfer rate can be adjusted while allowing a certain amount of data error.

  A data transmitting apparatus according to the present invention is a data transmitting apparatus that transmits digital data at an adjustable data transfer rate to the data receiving apparatus. In order to solve the above problems, the data transmitting apparatus The digital data and the error calculation transmission data are transmitted at the data transfer speed, and the error calculation transmission data having the same content as the error calculation transmission data transmitted at the data transfer speed is guaranteed in data quality. Data based on the error degree calculated based on the transmission unit for transmitting at the transfer rate and the error calculation transmission data transmitted at each of the data transfer rate and the transfer rate at which the data quality is guaranteed. An instruction signal receiving unit for receiving a transfer rate control instruction signal for instructing to adjust the data transfer rate transmitted from the receiving device; Based on the transfer speed control instruction signal instructing signal received by the reception unit, characterized in that it and a transfer rate control section for controlling the data transfer rate of the first transmission unit.

  According to the above configuration, the data transmission apparatus transmits normal digital data and error calculation transmission data at an adjustable data transfer speed, while calculating an error for reference at a transfer speed with guaranteed data quality. A transmission unit for transmitting the transmission data for use.

  Therefore, the data receiving apparatus can measure a data error occurring in the error calculation transmission data transferred at the data transfer speed based on the two error calculation transmission data. Then, the transfer rate control unit controls the data transfer rate based on the transfer rate control instruction signal transmitted from the data receiving device based on the error degree, so the digital data transfer rate is adjusted based on the calculated error. can do. In other words, the data transfer rate can be adjusted while allowing a certain amount of data error.

  The transmission unit multiplexes and transmits digital data and error calculation transmission data to be transmitted at the data transfer rate and error calculation transmission data to be transmitted at a transfer rate in which the quality of the data is guaranteed. It is preferable.

  According to the above configuration, the transmission unit can transmit the error calculation transmission data at both the data transfer rate and the transfer rate at which the data quality is guaranteed.

  An error correction code generation unit for generating error correction code data for correcting bit errors that occur during transfer of the digital data and error calculation transmission data transmitted from the transmission unit at the data transfer speed; The transmission unit preferably adds the error correction code data to the digital data and error calculation transmission data transmitted at the data transfer rate.

  According to the above configuration, data errors occurring during transfer can be corrected by the error correction code, so that data transfer with fewer data errors can be performed compared to a configuration that does not use the error correction code. . Alternatively, when data errors are allowed with the same degree, the data transfer speed can be increased.

  A data transfer system according to the present invention is a data transfer system in which a data reception device receives digital data transmitted at a data transfer rate adjustable by the data transmission device, and in order to solve the above-mentioned problem, the data reception system An apparatus includes: a first receiving unit that receives digital data and error calculation transmission data transmitted from the data transmission apparatus at the data transfer speed; and a transfer speed at which data quality is guaranteed from the data transmission apparatus. A second receiver for receiving error calculation transmission data having the same content as the error calculation transmission data transmitted to the first receiver, and transmitting from the data transmission device at the data transfer rate First error calculation reception data obtained by receiving the error calculation transmission data received by the first reception unit, and the data transmission apparatus. The second error calculation reception data obtained by the second reception unit receiving the error calculation transmission data transmitted at a transfer rate in which the quality of the data is guaranteed is compared with the 2 Error calculation means for calculating the degree of data difference between two pieces of received data for error calculation as an error degree, and a transfer rate control instruction signal for instructing the data transmission device to adjust the data transfer rate. An instruction signal transmitter for transmitting based on the error degree calculated by the error calculator, the data transmitter for digital data and error calculation at the data transfer rate with respect to the data receiver An error calculation having the same content as the transmission data for error calculation transmitted from the first transmission unit to the first transmission unit that transmits transmission data and the data reception device A transmission rate control instruction for instructing to adjust the data transfer rate transmitted from the data receiving device, a second transmission unit that transmits the transmission data for transmission at a transfer rate with guaranteed data quality An instruction signal receiving unit that receives a signal; and a transfer rate control unit that controls the data transfer rate of the first transmission unit based on a transfer rate control instruction signal received by the instruction signal receiving unit. It is characterized by.

  Therefore, as described above, the data transfer rate can be adjusted while allowing a certain amount of data error.

  A data transfer system according to the present invention is a data transfer system in which a data reception device receives digital data transmitted at a data transfer rate adjustable by the data transmission device, and in order to solve the above-mentioned problem, the data reception system The apparatus transmits the digital data and error calculation transmission data transmitted at the data transfer speed from the data transmission apparatus, and the data transfer speed transmitted at a transfer speed that guarantees the quality of the data. A receiver that receives error calculation transmission data having the same content as the error calculation transmission data, and the receiver receives error calculation transmission data transmitted from the data transmission device at the data transfer speed. The first error calculation reception data obtained by the above and the above data transmitted from the data transmission device at a transfer rate that guarantees the quality of the data The second error calculation reception data obtained by receiving the error calculation transmission data by the receiving unit is compared, and the degree of data difference between the two error calculation reception data is calculated as the error degree. An instruction signal for transmitting an error calculation means and a transfer rate control instruction signal for instructing the data transmission device to adjust the data transfer rate based on the error degree calculated by the error calculation unit A transmission unit, wherein the data transmission device transmits digital data and error calculation transmission data to the data reception device at the data transfer rate, and is transmitted at the data transfer rate. Transmitting data for error calculation having the same contents as the transmission data for transmission at a transfer rate that guarantees the quality of the data, and the data receiving device. An instruction signal receiving unit that receives a transfer rate control instruction signal for instructing to adjust the data transfer rate, and the transfer rate control instruction signal received by the instruction signal receiving unit. And a transfer rate control unit for controlling the data transfer rate of the transmission unit.

  Therefore, as described above, the data transfer rate can be adjusted while allowing a certain amount of data error.

  By the way, the data receiving apparatus may be realized by hardware or may be realized by causing a computer to execute a program. Specifically, the program according to the present invention is a program that causes a computer to operate as error calculation means provided in the data receiving apparatus, and the program is recorded on a recording medium according to the present invention.

  When these programs are executed by a computer, the computer operates as error calculation means of the data receiving apparatus. Therefore, similarly to the data receiving apparatus, the data transfer rate can be adjusted while allowing a certain amount of data error.

  As described above, the data receiving apparatus according to the present invention receives the error calculation transmission data transmitted at both the data transfer speed and the transfer speed at which the quality of the data is guaranteed, and receives the two received error calculation data. Based on the received data, a transfer rate control instruction signal that calculates the degree of error that has occurred in the error calculation data transferred at the data transfer rate and instructs the adjustment of the data transfer rate based on the calculated error rate Is configured to transmit.

  Therefore, as described above, the data transfer rate can be adjusted while allowing a certain amount of data error.

  Further, as described above, the data transmitting apparatus according to the present invention transmits the error calculation transmission data at both the data transfer rate and the transfer rate at which the quality of the data is guaranteed, and the two error calculation transmission data. The data transfer rate is controlled based on the transfer rate control instruction signal transmitted from the data receiving device based on the error degree calculated based on the above.

  Therefore, as described above, the data transfer rate can be adjusted while allowing a certain amount of data error.

  Furthermore, a data transfer system according to the present invention includes the above-described data transfer device and data receiving device.

  Therefore, as described above, the data transfer rate can be adjusted while allowing a certain amount of data error.

[Embodiment 1]
A data transfer system according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5 as follows. The data transfer system according to the present embodiment is used to transfer digital data between semiconductor integrated circuits mounted on electronic devices. FIG. 1 is a block diagram showing a functional configuration of the data transfer system according to the present embodiment.

  As shown in FIG. 1, the data transfer system 1 includes a transmission device (data transmission device) 10 and a reception device (data reception device) 20. In this data transfer system 1, digital data generated by a semiconductor integrated circuit (not shown) on the transmission device 10 side is transmitted to a semiconductor integrated circuit (not shown) on the reception device 20 side via the transmission device 10 and the reception device 20. The That is, the digital data is sent from the transmission device 10 to the reception device 20.

  In the present embodiment, in order to simplify the description, an example in which a serial interface is used for data exchange (the data transmission path 31 and the data transmission path 32 in FIG. 1) between the transmission apparatus 10 and the reception apparatus 20 is shown. . However, the present invention is not limited to the serial interface, and it goes without saying that a parallel interface may be adopted.

The transmission apparatus 10 includes a transmission unit (first transmission unit) 11, a transmission data storage unit 12, a transfer rate control unit 13, an error rate measurement data transmission unit (second transmission unit) 14, and an instruction signal reception unit 15. It has. The receiving apparatus 20 includes a receiver (first receiver) 21, the reception data storage unit 22, the error rate measuring unit (erroneous Risan detecting means) 23, an instruction signal transmitting section 24, and an error rate measurement data received Section (second receiving section) 25.

  First, each part of the transmission device 10 will be described. The transmission data storage unit 12 is a circuit that stores digital data to be transferred from the transmission device 10 to the reception device 20. Digital data generated by the semiconductor integrated circuit on the transmission apparatus 10 side is accumulated in the transmission data accumulation unit 12 and transmitted to the transmission unit 11 at a predetermined timing. A part of the digital data transmitted to the transmission unit 11 is also transmitted to the error rate measurement data transmission unit 14 described later as error rate measurement data in order to measure the error rate.

  The transmission unit 11 is a circuit for transmitting digital data received from the transmission data storage unit 12 to the reception unit 21 of the reception device 20. Here, the transfer rate of digital data between the transmission unit 11 of the transmission device 10 and the reception unit 21 of the reception device 20 can be adjusted (changed) as appropriate. Hereinafter, a path for transmitting data from the transmission unit 11 of the transmission apparatus 10 to the reception unit 21 of the reception apparatus 20 is referred to as a data transmission path 31.

  The transfer rate control unit 13 adjusts the transfer rate. The transfer rate control unit 13 is a circuit for adjusting the transfer rate of the transmission unit 11 based on an instruction signal received by an instruction signal receiving unit described later. At this time, the transfer rate controller 13 also adjusts the transfer rate of the error rate measurement data transmitter 14.

  The error rate measurement data transmission unit 14 determines the bit error that occurs in the data transmission path 31 between the transmission unit 11 of the transmission device 10 and the reception unit 21 of the reception device 20. This is a circuit for transmitting the error calculation transmission data) to the error rate measurement data receiving unit 25 of the receiving device 20. Hereinafter, a path for transmitting data from the error rate measurement data transmission unit 14 of the transmission apparatus 10 to the error rate measurement data reception unit 25 of the reception apparatus 20 is referred to as a data transmission path 32.

  The data transfer speed in the data transmission path 32 is equal to or less than the data transfer speed in the data transmission path 31 described above, and is a speed that guarantees the quality of data being transferred. The error rate measurement data transmitted via the data transmission path 32 is used as reference data (standard data) when measuring the error rate, but the data transmission path 32 guarantees the quality of the data being transferred. Because of the speed, the error rate measurement data reaches the error rate measurement data receiving unit 25 of the receiving device 20 without causing a bit error (data corruption) during transfer.

  In this specification, a bit error refers to a bit in data that is unintentionally replaced in the transmission path. In the present embodiment, a part of the digital data stored in the transmission data storage unit 12 is used as the error rate measurement data. However, the present invention is not limited to this, and a dedicated data for determining a bit error is used. Data may be used.

  The instruction signal receiving unit 15 is a circuit for receiving a transfer rate control instruction signal transmitted from the instruction signal transmitting unit 24 of the receiving device 20. The transfer rate control instruction signal is a signal for instructing to adjust the transfer rate of the digital data transmitted from the transmission unit 11.

  Next, each part of the receiving device 20 will be described. The reception unit 21 is a circuit for receiving digital data transmitted from the transmission unit 11 of the transmission device 10 via the data transmission path 31. The digital data received by the receiving unit 21 is transmitted to the received data storage unit 22. Of the digital data, error rate measurement data used for bit error determination is also transmitted to the error rate measurement unit 23.

  The reception data storage unit 22 is a circuit that stores digital data received by the reception unit 21. The digital data stored in the received data storage unit 22 is transmitted to the semiconductor integrated circuit on the receiving device 20 side at a predetermined timing. Thereby, the digital data transmitted from the semiconductor integrated circuit on the transmission device 10 side reaches the semiconductor integrated circuit on the reception device 20 side.

  The error rate measuring unit 23 compares the part of the digital data received by the receiving unit 21 with the error rate measuring data received by the error rate measuring data receiving unit 25, and thereby passes through the data transmission path 31. The rate of occurrence of bit errors in the transferred data (hereinafter referred to as “bit error rate”) is measured. Details of the bit error rate calculation method will be described later.

  The instruction signal transmission unit 24 transmits a transfer rate control instruction signal for adjusting the transmission rate of the digital data of the transmission unit 11 of the transmission device 10 so that the bit error rate in the data transmission path 31 is below a predetermined rate. This is a circuit for transmitting to the instruction signal receiving unit 15 of the transmitting device 10. Here, the instruction signal transmission unit 24 transmits a signal that instructs to increase, decrease, or maintain the transfer rate of the transmission unit 11 according to the error rate measured by the error rate measurement unit 23.

  The error rate measurement data receiver 25 is a circuit for receiving the error rate measurement data transmitted from the error rate measurement data transmitter 14 of the transmission device 10 via the data transmission path 32. When receiving the error rate measurement data, the error rate measurement data receiving unit 25 transmits the received error rate measurement data to the error rate measurement unit 23.

  Next, the operation of the data transfer system 1 according to the present embodiment will be described. Usually, in a data transfer system, when data transfer is performed between a transmission device and a reception device, a data error is not allowed, and the data transfer rate is determined within a range where there is no data error. However, depending on the data to be transferred, a data error may be allowed to some extent. In this case, even if the data quality is reduced by increasing the transfer rate, there is no problem in the system. From such a viewpoint, in the data transfer system 1 of the present embodiment, the bit error rate below a predetermined value is allowed to increase the transfer rate between devices.

  In the data transmission path 31, three signals of a SYNC signal, a DATA signal, and a CLK signal are transmitted from the transmission unit 11 to the reception unit 21. Here, the SYNC signal is a signal indicating the read timing of the error rate measurement data included in the digital data. The DATA signal is a signal indicating the content of digital data transmitted from the transmission unit 11 to the reception unit 21. The CLK signal is a signal indicating the read timing of each bit included in the digital data.

  In the data transmission path 32, the CCLK signal and the CDAT signal are transmitted from the error rate measurement data transmission unit 14 to the error rate measurement data reception unit 25. Here, the CDAT signal is a signal indicating the content of error rate measurement data transmitted from the error rate measurement data transmission unit 14 to the error rate measurement data reception unit 25. The CCLK signal is a signal indicating the read timing of each bit included in the error rate measurement data.

  As described above, the transfer rate of digital data transmitted from the transmission unit 11 to the reception unit 21 is defined by the frequency of the CLK signal. That is, the transfer rate of digital data corresponds to the frequency of the CLK signal, and in the following description, the transfer rate of digital data in the data transmission path 31 is considered as the frequency of the CLK signal. Similarly, the transfer rate of the error rate measurement data in the data transmission path 32 is considered as the frequency of the CCLK signal.

Assume that the transfer rate of the data transmission path 31 is f [Hz], and the bit error rate at that time is e + Δe [%]. However, in the above bit error rate e + Δe [%], e represents an average value of the bit error rate, and Δe represents an instantaneous maximum difference from the average value. Here, assuming that the upper limit of the allowable value of the bit error rate in the data transmission path 31 is e1 [%], in order to ensure that the bit error rate is always equal to or less than e1 in the data transmission path 31, the transfer rate is
e0 + Δe0 <e1 (1)
It must be a transfer rate f0 [Hz] giving a bit error rate e0 [%].

  In the present embodiment, the bit error rate e1 is determined in advance based on the type of digital data, and then e0 is calculated based on the characteristics of the transfer system obtained through experiments and the above equation (1). decide. When the bit error rate measured by the error rate measuring unit 23 is less than e0, the transfer rate control unit 13 increases the transfer rate, and when equal to e0, the transfer rate at that time is maintained. If e0 is exceeded, control is performed to decrease the transfer rate. FIG. 2 is a graph showing the relationship between the transfer rate f and the error rate e and the time t in the data transmission line 31 when such control is performed. In the graph, the left end indicates the start of transfer, and the transfer rate f at this time is the initial value fdef [Hz]. The fdef [Hz] is set to a transfer rate that is sufficiently low so that the bit error rate e becomes zero.

  Note that the transfer rate f0 that gives the bit error rate e0 varies depending on the ambient temperature of the semiconductor integrated circuit. In general, when the temperature is low or high, the number of bit errors during transfer tends to increase more easily than at normal temperature, so the value of the transfer rate f0 tends to be small. According to the data transfer system 1 of this embodiment, even when the temperature around the semiconductor integrated circuit rises during data transfer, the transfer rate is appropriately adjusted to a value that gives the bit error rate e0. The This makes it possible to transfer digital data as fast as possible while responding to environmental changes.

The bit error rate e0 can be set as appropriate according to the type of digital data. For example, an allowable bit error rate of 10 ⁻⁶ defined in a normal digital network, an actual bit error rate in a digital network, or the like. The bit error rate 10 ⁻⁸ may be determined with reference to the actual bit error rate 10 ⁻⁵ when data is transferred via a modem using a telephone line.

  In the present embodiment, a predetermined data error is allowed in the data transmission line 31, but the present invention is not limited to this, and a transfer rate may be adjusted so that a data error does not occur. In this case, by setting the value of e0 described above to 0, it is possible to adjust to a high transfer rate within a range where almost no data error occurs. FIG. 3 is a graph showing the relationship between the transfer rate f and error rate e and the time t in the data transmission line 31 when such control is performed.

  Next, a method for measuring the bit error rate and a method for controlling the transfer rate will be described in detail. FIG. 4 is a diagram illustrating a timing chart of each signal in the data transmission path 31 and the data transmission path 32 described above.

  In the data transmission path 31, n-bit digital data is converted into DAT (1, 1), DAT (1, 2),..., DAT (1, m),. 1), DAT (i, 2),..., DAT (i, m-1), DAT (i, m),..., DAT (i + 1, 1), DAT (i + 1, 2),. To the receiving unit 21. On the other hand, in the data transmission path 32, the error rate measurement data having an n-bit length is converted into CDAT (1, 1), CDAT (2, 1),. Are transmitted from the error rate measurement data transmitter 14 to the error rate measurement data receiver 25 in the order of (i + 1, 1),. In the above description, DAT and CDAT having the same number are the same data.

  As described above, in the present embodiment, the (x, 1) -th data that appears every m pieces of digital data transferred from the transmission device 10 to the reception device 20 is error rate measurement data as error rate measurement data. Is transmitted from the data transmission unit 14 to the error rate measurement data reception unit. That is, in the present embodiment, a part of the digital data transferred from the transmission device 10 to the reception device 20 is error rate measurement data from the error rate measurement data transmission unit 14 as error rate measurement data for determining a bit error. It is transmitted to the data receiving unit 25 and a part of the digital data is used to determine whether or not a bit error has occurred.

  In order to realize the above configuration, in the data transfer system 1 of the present embodiment, as shown in FIG. 4, the SYNC signal becomes HI every time digital data is transferred m times (m times) on the data transmission path 31. Become. The receiving unit 21 regards data received when the SYNC signal becomes HI as error rate measurement data.

  Further, the frequency of the CCLK signal of the data transmission path 32 is set lower than the frequency of the CLK signal of the data transmission path 31 and is a frequency that does not cause a bit error during the transfer of the data transmission path 32. . Accordingly, no bit error occurs in the error rate measurement data in the data transmission path 32, and the error rate measurement data receiving unit 25 that receives the error rate measurement data for reference needs to perform error correction. There is no such thing. In the present embodiment, as an example, the transfer speed in the data transmission path 32 is 1 / m of the transfer speed in the data transmission path 31 as shown in FIG. Accordingly, one piece of error rate measurement data is transferred through the data transmission path 32 while m pieces of data are transferred through the data transmission path 31.

  Next, a method for measuring the error rate by comparing the error rate measurement data DAT (i, 1) and CDAT (i, 1) shown in FIG. 4 will be described. When receiving the error rate measurement data DAT (i, 1), the receiving unit 21 transmits the error rate measuring data DAT (i, 1) to the error rate measuring unit 23. When the error rate measurement data receiving unit 25 receives the error rate measurement data CDAT (i, 1), the error rate measurement data receiving unit 25 transmits the data to the error rate measuring unit 23. Here, DAT (i, 1) and CDAT (i, 1) are originally data having the same contents, but DAT (i, 1) received by the receiving unit 21 is a bit during transfer in the data transmission path 31. It may contain errors. On the other hand, the CDAT (i, 1) received by the error rate measurement unit 23 is transferred through the data transmission path 32 at a transfer rate that guarantees the data quality, and therefore does not include bit errors.

  FIG. 5 is a functional block diagram showing detailed configurations of the error rate measurement unit 23 and the instruction signal transmission unit 24. The error rate measurement unit 23 includes an EXOR gate 231, a 1 data bit error holding unit 232, a cumulative bit error holding unit 233, a bit error adding unit 237, a bit error measurement value holding unit 234, a bit error setting value holding unit 235, a comparison unit. 236. The instruction signal transmission unit 24 includes a transfer rate setting unit 241 and a transfer rate setting data transmission unit 242.

The EXOR gate 231 is a circuit that outputs an EXOR value of the error rate measurement data transmitted from the reception unit 21 and the error rate measurement data transmitted from the error rate measurement data reception unit 25. At the timing shown in FIG. 4, the error rate measurement data DAT (i, 1) transferred through the data transmission path 31 and the error rate measurement data CCDAT (i, 1) transferred through the data transmission path 32 are: When each transfer is completed, data bits are sequentially input to the EXOR gate 231 to determine a bit error included in DAT (i, 1). For example, both DAT (i, 1) and CDAT (i, 1) are 8 bits (n = 8),
DAT (i, 1) = 0110 1100
CDAT (i, 1) = 0101 1100
If it is,
EXOR value = 0011 0000
It becomes. Here, among the bits, “0” indicates a bit that does not cause a bit error, and “1” indicates a bit that causes a bit error. Then, the EXOR value is input to the 1 data bit error holding unit 232.

The 1 data bit error holding unit 232 is a circuit that adds each bit of the input EXOR value and holds the added value. For example, when the EXOR value is “0011 0000” as described above, the addition value BE (i) of each bit is
BE (i) = 0 + 0 + 1 + 1 + 0 + 0 + 0 + 0 = 2
It becomes. Thus, it can be seen that DAT (i, 1) includes a bit error of 2 bits. That is, the EXOR gate 231 and the 1 data bit error holding unit 232

が算出される。算出されたＢＥ（ｉ）は、累積ビット誤り保持部２３３およびビット誤り加算部２３７に入力される。

Is calculated. The calculated BE (i) is input to the cumulative bit error holding unit 233 and the bit error addition unit 237.

  The accumulated bit error holding unit 233 accumulates bit errors from DAT (i−K + 1, 1) to DAT (i−1, 1) (that is, K−1 data before DAT (i, 1)). The accumulated BE (i−1), which is the accumulated value of bit errors at this stage, is a circuit for holding

と表される。累積ビット誤り保持部２３３は、１データビット誤り保持部２３２からＢＥ（ｉ）が入力されると、上記の累積ＢＥ（ｉ−１）をビット誤り加算部２３７に送信する。そして、累積ビット誤り保持部２３３は、入力されたＢＥ（ｉ）と累積ＢＥ（ｉ−１）とを加算して累積ＢＥ（ｉ）を算出し、算出した累積ＢＥ（ｉ）を次段の累積ＢＥとして保持する。

It is expressed. When the BE (i) is input from the 1 data bit error holding unit 232, the cumulative bit error holding unit 233 transmits the accumulated BE (i-1) to the bit error adding unit 237. Then, the cumulative bit error holding unit 233 calculates the cumulative BE (i) by adding the input BE (i) and the cumulative BE (i−1), and the calculated cumulative BE (i) Hold as cumulative BE.

  The bit error adding unit 237 adds BE (i) input from the 1-data bit error holding unit 232 and accumulated BE (i−1) input from the accumulated bit error holding unit 233 to obtain DAT (i This is a circuit for calculating the cumulative bit error number SUMBE (i) in K pieces of bit error measurement data from (K + 1,1) to DAT (i, 1). This SUMBE (i) is

と表される。このＳＵＭＢＥ（ｉ）は、ビット誤り測定値保持部２３４に入力され、保持される。なお、このＳＵＭＢＥ（ｉ）は、Ｋ個の誤り率測定用データにおけるビット誤り数であることから、データ伝送路３１の平均的なビット誤り率ｅ（ｉ）は、

It is expressed. This SUMBE (i) is input to the bit error measurement value holding unit 234 and held. Since SUMBE (i) is the number of bit errors in K error rate measurement data, the average bit error rate e (i) of the data transmission path 31 is

として容易に計算することができる。

Can be easily calculated.

  The bit error setting value holding unit 235 is a circuit for holding the upper limit value of the number of bit errors allowed in the data transmission path 31. Specifically, the total number of allowable bit errors included in K n-bit data when the average bit error rate allowed in the data transmission path 31 is e0 is calculated, and the bit error setting value holding unit 235 is calculated. Set in advance. If the value of the total number of allowable bit errors is SUMBEREF, SUMBEREF is

で表される。

It is represented by

The above SUMBE (i) and SUMBEREF are input to the comparison unit 236. The comparison unit 236 is a circuit that compares the bit error count SUMBE (i) held in the bit error measurement value holding unit with the set allowable bit error total SUMBEREF. In the present embodiment, the comparison unit 236 compares the number of bit errors to determine the magnitude relationship between the error rate measurement value e (i) in the data transmission path 31 and the error rate allowable value e0. Specifically, the comparison unit 236 compares SUMBE (i) with SUMBEREF,
(A) SUMBE (i) is larger than SUMBEREF (P> Q in FIG. 5),
(B) SUMBE (i) is equal to SUMBEREF (P = Q in FIG. 5);
(C) SUMBE (i) is smaller than SUMBEREF (P <Q in FIG. 5);
It is determined which one is. Then, the determination result is input to the transfer rate setting unit 241 of the instruction signal transmission unit 24.

The transfer rate setting unit 241 of the instruction signal transmission unit 24 is a circuit that sets the transfer rate in the data transmission path 31 according to the determination result input from the comparison unit 236 of the error rate measurement unit 23. When the determination result is (b) above, the transfer rate setting unit 241 creates transfer rate instruction data for instructing to decrease the transfer rate of the data transmission path 31, and the determination result is ), Transfer rate instruction data for instructing to maintain the transfer rate of the data transmission path 31 is created. If the determination result is (c) above, transfer of the data transmission path 31 is performed. Transfer speed instruction data for instructing to increase the speed is created.

  In this embodiment, the transfer rate setting unit 241 holds the current transfer rate, and creates the adjusted transfer rate value (target value) as p-bit length data VDAT (i, 1). That is, when the determination result is (A) above, a transfer rate obtained by reducing a predetermined value from the current transfer rate is created as VDAT (i, 1), and the determination result is ), The same value as the current transfer rate is created as VDAT (i, 1). If the determination result is (c) above, a predetermined value is determined from the current transfer rate. The transfer rate with the increased value is created as VDAT (i, 1). The above-mentioned “predetermined value” is a value that is large enough to control the transfer rate sufficiently fast and small enough to converge the transfer rate to a value that gives the target bit error rate e0 (%). As such, it may be determined appropriately through experiments or the like.

  The VDAT (i, 1) created by the transfer rate setting unit 241 is input to the transfer rate setting data transmission unit 242. The transfer rate setting data transmission unit 242 is a circuit that transmits VDAT (i, 1) to the instruction signal reception unit of the transmission device 10 using the VDAT signal. At this time, the transmission of the VDAT signal is performed at the timing at which the next DAT (i + 1, 1) is transmitted in synchronization with the CCLK signal, as shown in FIG. Here, since the frequency of the CCLK signal is a frequency that guarantees the quality of the data being transferred, VDAT (i, 1) can be reliably transmitted to the instruction signal receiving unit 15 of the transmitting apparatus 10 without causing a bit error. To reach. Since VDAT (i, 1) is calculated based on DAT (i, 1) and CDAT (i, 1), in FIG. 4, DAT (i, 1) and CDAT ( VDAT (i-1, 1) is transmitted at the timing of receiving i, 1). In the present embodiment, as shown in FIG. 4, since VDAT data is sent to the transfer rate control unit 13 for each SYNC signal, the transfer rate of the data transmission path 31 can be updated for each SYNC signal. ing.

  The instruction signal receiving unit 15 of the transmitting device 10 transmits the received VDAT (i, 1) to the transfer rate control unit 13, and the transfer rate control unit 13 transfers the transfer rate in the data transmission path 31 (that is, the frequency of the CLK signal). The transmission unit 11 is controlled so that the transfer rate included in the received VDAT (i, 1) is obtained. On the other hand, the error rate measurement data transmission unit 14 is set so that the transfer rate (that is, the frequency of the CCLK signal) in the data transmission path 32 is 1 / m of the transfer rate included in the received VDAT (i, 1). To control. In this way, the transfer speed in the data transmission path 31 is adjusted.

  In this embodiment, the transfer rate setting unit 241 is configured to create data including a target transfer rate value. However, the present invention is not limited to this. For example, transfer rate instruction data is transferred. It may be data that does not include the speed value itself but only instructs to increase, decrease, or maintain the transfer speed. In this case, the transfer rate control unit 13 is configured to hold the current transfer rate, and the transfer at the next stage is performed according to data instructing increase, decrease, or maintenance of the transfer rate included in VDAT (i, 1). What is necessary is just to set it as the structure which determines a speed concretely.

  As described above, in this embodiment, the receiving device 20 receives the digital data and the error rate measurement data transmitted from the transmitting device 10 at the data transfer speed, and the data received from the transmitting device 10 Two receiving units, an error rate measuring data receiving unit 25 for receiving error rate measuring data having the same content as the error rate measuring data transmitted to the receiving unit 21 and transmitted at a transfer rate with guaranteed quality, are provided. I have. Then, DAT (i, 1) obtained by the reception unit 21 receiving the error rate measurement data transmitted at the data transfer speed from the transmission device, and the transfer with the data quality guaranteed from the transmission device 10 The error rate measurement data transmitted at the speed is compared with CDAT (i, 1) obtained by receiving the error rate measurement data receiving unit 25, and the data difference between the two error rate measurement data An error rate measurement unit 23 that calculates the number of bit errors as the number of bit errors, and the instruction signal transmission unit 24 instructs to adjust the speed for data transfer according to the number of bit errors measured by the error rate measurement unit 23 The VDAT signal is transmitted to the transmission device 10.

  According to the above configuration, a dedicated error rate measurement data receiving unit is separately provided for receiving the error rate measurement data, and this transfer rate is set to a rate that can guarantee the quality of the data being transferred. As a result, the bit error rate occurring in the data transmission path 31 can be calculated based on the two error rate measurement data, and the data transmission path 31 can be calculated according to the calculated bit error rate. By adjusting the transfer rate, the data transfer rate can be adjusted while allowing a desired data error. In this way, by adjusting the data transfer rate while allowing a desired data error, the transfer rate can be further increased as compared with a case where no data error is allowed.

  In this embodiment, the error rate measurement data transmitted from the transmission device 10 is intermittently transmitted, and the error rate measurement unit 23 calculates the number of bit errors for each error rate measurement data. An EXOR gate 231 and a 1 data bit error holding unit 232 are provided, and a cumulative bit error holding unit 233 that accumulates the calculated number of bit errors is provided. The instruction signal transmission unit 24 is configured to transmit a VDAT signal that instructs control of the transfer rate according to the number of accumulated bit errors.

  According to the above configuration, predetermined data transmitted intermittently can be used as error rate measurement data without using all of the digital data transmitted from the transmission device 10 to the reception device 20. The transfer rate in the data transmission path 31 can be controlled in consideration of an average bit error rate based on a plurality of error rate measurement data. Therefore, the transfer rate in the data transmission path 31 can be adjusted to a transfer rate that gives an ideal bit error rate e0 (%) without being influenced by instantaneous bit error variations.

[Embodiment 2]
A data transfer system according to another embodiment of the present invention will be described below with reference to FIGS. FIG. 6 is a block diagram showing a functional configuration of the data transfer system according to the present embodiment. In addition, about the member which has the same function as the data transfer system 1 of Embodiment 1 mentioned above, the same member number is attached | subjected and description is abbreviate | omitted.

  Compared with the data transfer system 1 of the first embodiment, the data transfer system 101 of the present embodiment has only one data transmission path 131 without having two data transmission paths 31 and 32, and It differs from the data transfer system 1 of the first embodiment in that error rate measurement data for reference is multiplexed with normal digital data and transmitted.

The data transfer system 101 according to the present embodiment includes a transmission device (data transmission device) 110 and a reception device (data reception device) 120. The transmission apparatus 110 includes a transmission unit 111, a transmission data storage unit 12, a transfer rate control unit 13, an error rate measurement transmission data holding unit 114, and an instruction signal reception unit 15. The receiving apparatus 120, receiving unit 121, the reception data storage unit 22, a error rate measuring section (erroneous Risan detecting means) 23, an instruction signal transmitting section 24, and the received data holding unit 125 for error rate measurement .

  First, each unit of the transmission device 110 will be described. The transmission data storage unit 12 is a circuit that stores digital data to be transferred from the transmission device 10 to the reception device 20. Digital data generated by the semiconductor integrated circuit on the transmission device 10 side is accumulated in the transmission data accumulation unit 12 and transmitted to the transmission unit 111 at a predetermined timing. A part of the digital data transmitted to the transmission unit 111 is also transmitted to the error rate measurement transmission data holding unit 114, which will be described later, as error rate measurement data in order to measure the error rate.

  The transmission unit 111 is a circuit for transmitting the digital data received from the transmission data storage unit 12 and the error rate measurement data held by the error rate measurement transmission data holding unit 114 to the reception unit 121 of the reception device 120. It is. Here, the transfer rate of digital data between the transmission unit 111 of the transmission device 110 and the reception unit 121 of the reception device 120 can be appropriately adjusted (changed). Hereinafter, a path for transmitting data from the transmission unit 111 of the transmission apparatus 110 to the reception unit 121 of the reception apparatus 120 is referred to as a data transmission path 131.

  Note that the transfer rate in the data transmission path 131 includes a normal data transfer rate for transferring normal digital data, and an error rate measurement data transfer rate for transmitting reference error rate measurement data. There are two types of transfer speeds, and these two types of transfer speeds are appropriately switched according to the data to be transmitted. Details thereof will be described later.

  The data transfer speed for error rate measurement is equal to or less than the normal data transfer speed, and the speed at which the quality of data being transferred is guaranteed. The error rate measurement data transmitted at the error rate measurement data transfer rate is used as reference data (reference data) when measuring the error rate, but is transferred at a rate that guarantees the quality of the data being transferred. Therefore, the error rate measurement data for reference reaches the reception unit 121 of the reception device 120 without causing a bit error (data corruption) during transfer.

  That is, the normal data transfer speed of this embodiment corresponds to the transfer speed of the data transmission path 31 of the first embodiment, and the error rate measurement data transfer speed of this embodiment is the transfer of the data transmission path 32 of the first embodiment. Corresponds to speed. The error rate measurement data transferred at the normal data transfer speed in the first embodiment corresponds to the error rate measurement data transferred through the data transmission path 31 in the first embodiment, and is used for error rate measurement data transfer. The error rate measurement data transferred at a speed corresponds to the error rate measurement data transferred through the data transmission path 32 of the first embodiment.

  The transfer rate control unit 13 adjusts the normal data transfer rate and the error rate measurement data transfer rate. The transfer rate control unit 13 is a circuit for adjusting the above two types of transfer rates based on an instruction signal transmitted from the receiving device 120.

  The error rate measurement transmission data holding unit 114 holds error rate measurement data (error calculation transmission data) for determining bit errors occurring in the digital data transferred at the normal data transfer speed. It is a circuit to keep. In the present embodiment, the transmission unit 111 needs to transmit the error rate measurement data once at each of the normal data transfer rate and the error rate measurement data transfer rate, twice in total. The error rate measurement transmission data holding unit 114 needs to temporarily hold the error rate measurement data.

  Next, each unit of the receiving device 120 will be described. The reception unit 121 is a circuit for receiving digital data and error rate measurement data transmitted from the transmission unit 111 of the transmission device 110 via the data transmission path 31. The digital data received by the receiving unit 21 is transmitted to the received data storage unit 22. The reference error rate measurement data transferred at the error rate measurement data transfer rate is transmitted to the error rate measurement unit 23. On the other hand, the error rate measurement data transferred at the normal data transfer rate is also transmitted to the error rate measurement unit 23.

  The reception data storage unit 22 is a circuit that stores the digital data received by the reception unit 121, and has the same function as the reception data storage unit 22 of the first embodiment. The error rate measurement reception data holding unit 125 is a circuit that temporarily holds the reference error rate measurement data received by the reception unit 121. The reference error rate measurement data held by the error rate measurement reception data holding unit 125 is transmitted to the error rate measurement unit 23.

The error rate measurement unit 23 compares the error rate measurement data transferred at the normal data transfer rate with the reference error rate measurement data transferred at the error rate measurement data transfer rate, the incidence of bit errors in the transferred data in a normal data transfer rate (hereinafter, referred to as "bit error rate") is measured. The bit error rate calculation method is the same as in the first embodiment.

  The instruction signal transmission unit 24 transmits a transfer rate control instruction signal for adjusting the normal data transfer rate so that the bit error rate in the data transmission path 31 is less than or equal to a predetermined rate. And has a function similar to that of the instruction signal transmission unit 24 of the first embodiment.

  Next, the operation of the data transfer system 1 according to the present embodiment will be described. In the present embodiment, on the data transmission path 131, three signals of a SYNC signal, a DATA signal, and a CLK signal are transmitted from the transmission unit 11 to the reception unit 21. Here, the SYNC signal is a signal indicating the read timing of the reference error rate measurement data included in the data transferred through the data transmission path 131. While this SYNC signal is HI, reference error rate measurement data is transmitted. The DATA signal is a signal indicating the contents of digital data and error rate measurement data transmitted from the transmission unit 11 to the reception unit 21.

  The CLK signal is a signal indicating the read timing of each bit included in the digital data and the error rate measurement data. In the present embodiment, the CLK signal does not always have a constant frequency, but has a configuration in which the frequency varies. That is, as shown in FIG. 7, when the reference error rate measurement data CDAT (i, 1) is transferred, the frequency of the CLK signal becomes a frequency corresponding to the error rate measurement data transfer rate. . In other cases, that is, when normal digital data DAT (i, 1), DAT (i, 2),..., DAT (i, m) are transferred, the frequency of the CLK signal is the normal data transfer. The frequency corresponds to the speed of use.

  The CDAT (i, 1) transferred at the data transfer rate for error rate measurement determines a bit error of the data DAT (i, 1) transferred from the transmission device 110 to the reception device 120 at the normal data transfer rate. Since it becomes reference data, the data transfer rate for error rate measurement when transmitting CDAT (i, 1) on the data transmission path 131 needs to be a transfer rate that does not cause bit errors (data corruption). Therefore, the frequency of the CLK signal that defines the data transfer speed for error rate measurement when transferring CDAT (i, 1) in FIG. 7 is transferred as fcd, DAT (i, l) (l = 1... M). When the frequency of the CLK signal that defines the normal data transfer speed is fd,

となるように、送信部１１はＣＬＫ信号を出力する。

Thus, the transmission unit 11 outputs a CLK signal.

  Further, in this embodiment, as shown in FIG. 7, reference error rate measurement data CDAT (i, 1) is transferred, and then normal digital data DAT (i, 1), DAT (i, 2) are transferred. ),..., DAT (i, m) is transferred. Thereafter, reference error rate measurement data CDAT (i + 1, 1) is transferred, and then normal digital data DAT (i + 1, 1), DAT (i + 1, 2),..., DAT (i + 1, m) are transferred. Is done. As described above, in this embodiment, reference error rate measurement data and normal digital data are alternately transmitted.

  Similar to Embodiment 1 described above, in this embodiment, reference error rate measurement data CDAT (i, 1) and error rate measurement data DAT (i, 1) included in normal digital data are also included. Used to measure the bit error rate. In the present embodiment, since the reference error rate measurement data CDAT (i, 1) is received by the receiving unit 121 first, the received CDAT (i, 1) is temporarily received by the error rate measuring reception data holding unit 125. Until the receiving unit 121 receives DAT (i, 1). Then, DAT (i, 1) is transmitted from the receiving unit 121 to the error rate measuring unit 23, and at the same time, CDAT (i, 1) is transmitted from the error rate measuring reception data holding unit 125 to the error rate measuring unit 23. Is done. The subsequent measurement of the bit error rate is the same as in the first embodiment.

  As shown in FIG. 7, the error rate measurement data CDAT (i + 1, 1) for reference is transmitted as the transfer rate control instruction signal VDAT (i, 1) for instructing the adjustment of the normal data transfer rate. The instruction signal is transmitted from the instruction signal transmission unit 24 to the instruction signal reception unit 15 at a timing of transfer from the unit 111 to the reception unit 121. Subsequent operations relating to transfer rate control are the same as those in the first embodiment.

  According to the configuration of the present embodiment, reference error rate measurement data is multiplexed with normal digital data and transmitted, so that the number of transmitters, receivers, and signal lines connecting them can be reduced. There is. On the other hand, according to the configuration of the first embodiment described above, the frequency of the CLK signal can be fixed, so that there is an advantage that the circuit configuration can be simplified.

[Embodiment 3]
A data transfer system according to another embodiment of the present invention will be described with reference to FIG. FIG. 8 is a block diagram showing a functional configuration of the data transfer system according to the present embodiment. In addition, about the member which has the same function as the data transfer system 1 of Embodiment 1 mentioned above, the same member number is attached | subjected and description is abbreviate | omitted.

  The data transfer system 201 of the present embodiment is different from the data transfer system 1 of the first embodiment in that the transmission device 210 further includes an error correction code generation unit 216 and the reception device 220 further includes an error correction unit 226. Yes.

  The error correction code generation unit 216 is a circuit for generating an error correction code for correcting a bit error that occurs during transfer for the digital data transmitted from the transmission unit 111. The error correction unit 226 is a circuit for correcting the bit error generated during the transfer based on the error correction code for the digital data received by the reception unit 121. For example, a CRC code can be used as the error correction code, but the present invention is not limited to this, and any suitable correction code can be used.

  In the present embodiment, the digital data stored in the transmission data storage unit 12 of the transmission device 210 is transmitted to the transmission unit 11 and also to the error correction code generation unit 216. Then, the error correction code generation unit 216 generates an error correction code for correcting an error for the transmitted digital data, and transmits the generated correction code to the transmission unit 11. Then, the transmission unit 11 adds an error correction code to the digital data, and transmits this to the reception unit 21 of the reception device 220 via the data transmission path 31.

  On the other hand, when receiving the digital data to which the error correction code is added, the receiving unit 21 of the receiving device 220 transmits the digital data to the error correcting unit 226. The error correction unit 226 corrects a bit error generated during the transfer through the data transmission path 31 based on the error correction code added to the received digital data. Then, the corrected digital data is transmitted to the reception data storage unit 22. Of the corrected digital data, data used as error rate measurement data is also transmitted to the error rate measurement unit 23.

  In the present embodiment, the error rate measurement unit 23 includes error rate measurement data included in digital data in which a bit error is corrected based on an error correction code, and a reference error transferred via the data transmission path 32. Rate measurement data is input, and a bit error rate that cannot be corrected based on the correction code is calculated. Other configurations are the same as those in the first embodiment.

  According to the data transfer system 201 of this embodiment, since the error correction code is added, the net data transfer speed is lower than that of the first embodiment, but there is an advantage that the data quality can be improved.

[Supplement]
In each of the above embodiments, a data transfer system used for data transfer between semiconductor integrated circuits has been described. However, the present invention is not limited to this, and for example, data used for data transfer between communication terminal devices. It can also be applied to a transfer system.

  Finally, in each of the above-described embodiments, an example in which the error rate measuring unit 23 is configured by hardware logic has been described.

  In this case, each of the receiving devices 20, 120, and 220 includes a central processing unit (CPU) that executes instructions of a control program that implements each function, a read only memory (ROM) that stores the program, and a RAM ( random access memory), a storage device (recording medium) such as a memory for storing the program and various data. An object of the present invention is to provide a program code (execution format program, intermediate code program, source program) of a control program of the receiving device 20, 120, or 220, which is software that implements the function of the error rate measuring unit 23 described above, as a computer. This can also be achieved by supplying the recording medium recorded in such a manner as to be readable to the receiver 20, 120, 220 and reading out and executing the program code recorded on the recording medium by the computer (or CPU or MPU). It is.

  Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

  Further, the receiving devices 20, 120, and 220 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Further, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  According to the data transfer system of the present invention, the data transfer rate can be adjusted while allowing a certain amount of data error. Therefore, the present invention can be applied to a data transfer system between semiconductor integrated circuits and between communication terminal devices, and in particular, to a data transfer system for transferring digital data that is allowed if there is some data error such as audio data, image data, and video data. It can be suitably applied.

1, showing an embodiment of the present invention, is a block diagram showing a main configuration of a data transfer system. FIG. It is a figure which shows the relationship between each of data transfer rate f [Hz] and bit error rate e [%], and time. It is a figure which shows the relationship between each of data transfer rate f [Hz] and bit error rate e [%], and time. FIG. 5 is a diagram illustrating an embodiment of the present invention and a timing chart of data transferred by the data transfer system. FIG. 4 is a block diagram illustrating configurations of an error rate measurement unit and an instruction signal transmission unit according to an embodiment of the present invention. FIG. 10, showing another embodiment of the present invention, is a block diagram showing a main configuration of a data transfer system. It is a figure which shows other embodiment of this invention and shows the timing chart of the data transferred with a data transfer system. FIG. 29 is a block diagram illustrating still another embodiment of the present invention and illustrating a configuration of a main part of a data transfer system.

Explanation of symbols

1.101.201 Data Transfer System 10.110.210 Transmitting Device (Data Transmitting Device)
20, 120, 220 Receiver (data receiver)
11. 111 Transmitter (first transmitter)
13 Transfer rate control unit 14 Data transmission unit for error rate measurement (second transmission unit)
15 Instruction signal receiving unit 21/121 receiving unit (first receiving unit)
23 Error rate measurement unit 24 Instruction signal transmission unit 25 Data reception unit for error rate measurement (second reception unit)

Claims (13)

A data receiving device for receiving digital data transmitted from a data transmitting device at an adjustable data transfer rate,
A first receiver for receiving digital data and error calculation transmission data transmitted from the data transmission device at the data transfer rate;
Second reception for receiving error calculation transmission data having the same content as the error calculation transmission data transmitted to the first reception unit, which is transmitted from the data transmission device at a transfer rate at which data quality is guaranteed. And
First error calculation reception data obtained by the first reception unit receiving error calculation transmission data transmitted from the data transmission device at the data transfer rate; and data from the data transmission device. Comparing the second error calculation reception data obtained by the second reception unit receiving the error calculation transmission data transmitted at a transfer rate at which quality is guaranteed, the two error calculations are performed. Error calculating means for calculating the degree of difference in data between received data for use as an error degree and determining the magnitude relationship between the calculated error degree and an allowable error degree determined in advance based on the type of digital data When,
With respect to the data transmission device, the transmission speed control instruction signal for instructing to adjust the data transfer rate, and a command signal transmitting unit for transmitting in response to by that determination result to the error calculation means A data receiving device characterized by comprising: A data receiving device for receiving digital data transmitted from a data transmitting device at an adjustable data transfer rate,
Digital data and error calculation transmission data transmitted at the data transfer rate from the data transmission device, and error calculation transmitted at the data transfer rate transmitted at a transfer rate with guaranteed data quality Receiving unit for receiving error calculation transmission data having the same content as the transmission data for transmission;
The first error calculation reception data obtained by the reception unit receiving the error calculation transmission data transmitted from the data transmission device at the data transfer speed, and the data quality from the data transmission device are guaranteed. Compared with the second error calculation reception data obtained by the reception unit receiving the error calculation transmission data transmitted at the determined transfer rate, the data between the two error calculation reception data An error calculation means for calculating a magnitude relationship between the calculated error degree and an allowable error degree determined in advance based on the type of digital data ;
With respect to the data transmission device, the transmission speed control instruction signal for instructing to adjust the data transfer rate, and a command signal transmitting unit for transmitting in response to by that determination result to the error calculation means A data receiving device characterized by comprising:   The digital data and error calculation transmission data transmitted from the data transmission device at the data transfer rate and the error calculation transmission data transmitted from the data transmission device at a transfer rate with guaranteed data quality are multiplexed. The data receiving apparatus according to claim 2, wherein The reception unit intermittently receives a plurality of error calculation transmission data from the data transmission device,
The error calculation means calculates the error degree by comparing the first error calculation reception data and the second error calculation reception data based on the error calculation transmission data for each error calculation transmission data. And accumulate the error degree calculated for each error calculation transmission data,
4. The data reception according to claim 1, wherein the instruction signal transmission unit transmits the transfer rate control instruction signal based on an error degree accumulated by the error calculation unit. 5. apparatus. Error correction code data for correcting bit errors generated during the transfer of each data is added to the digital data and error calculation transmission data transmitted from the data transmission device at the data transfer speed,
Error correction for correcting received digital data and error calculation reception data obtained by receiving the digital data and error calculation transmission data transmitted at the data transfer speed based on the error correction code data. Further comprising
The error calculation means calculates the error degree using the error calculation reception data corrected by the error correction unit as the first error calculation reception data. The data receiving device according to claim 1. A data transmitting device for transmitting digital data at an adjustable data transfer rate to a data receiving device,
A first transmitter for transmitting digital data and error calculation transmission data to the data receiving device at the data transfer speed;
Second transmission for transmitting the error calculation transmission data having the same content as the error calculation transmission data transmitted from the first transmission unit to the data receiving apparatus at a transfer rate in which the quality of the data is guaranteed. And
Depending on the magnitude relationship between the error degree calculated based on the error calculation transmission data transmitted from the first and second transmitters and the allowable error degree determined in advance based on the type of digital data An instruction signal receiving unit that receives a transfer speed control instruction signal for instructing to adjust the data transfer speed transmitted from the data receiving device;
A data transmission rate control unit configured to control the data transmission rate of the first transmission unit based on a transmission rate control instruction signal received by the command signal reception unit; apparatus. A data transmitting device for transmitting digital data at an adjustable data transfer rate to a data receiving device,
The digital data and the error calculation transmission data are transmitted to the data receiving device at the data transfer rate, and the error calculation transmission data having the same content as the error calculation transmission data transmitted at the data transfer rate is transmitted. A transmitter that transmits data at a guaranteed transfer rate;
It is determined in advance based on the error degree calculated based on the error calculation transmission data transmitted at each of the data transfer speed and the transfer speed at which the data quality is guaranteed, and the type of digital data. An instruction signal receiving unit that receives a transfer rate control instruction signal for instructing to adjust the data transfer rate, transmitted from the data receiving device in accordance with the magnitude relationship with the allowable value of the error degree ;
A data transmission apparatus comprising: a transfer rate control unit that controls the data transfer rate of the transmission unit based on a transfer rate control instruction signal received by the instruction signal receiving unit.   The transmission unit multiplexes and transmits digital data and error calculation transmission data to be transmitted at the data transfer rate, and error calculation transmission data to be transmitted at a transfer rate at which data quality is guaranteed. The data transmission apparatus according to claim 7, wherein the data transmission apparatus is characterized. An error correction code generation unit for generating error correction code data for correcting bit errors that occur during transfer of the digital data and error calculation transmission data transmitted from the transmission unit at the data transfer rate;
9. The transmission unit according to claim 6, wherein the transmission unit adds the error correction code data to digital data and error calculation transmission data transmitted at the data transfer speed. 10. Data transmission device. A data transfer system in which a data receiving device receives digital data transmitted at a data transfer rate adjustable by the data transmitting device,
The data receiving device is:
A first receiver for receiving digital data and error calculation transmission data transmitted from the data transmission device at the data transfer rate;
Second reception for receiving error calculation transmission data having the same content as the error calculation transmission data transmitted to the first reception unit, which is transmitted from the data transmission device at a transfer rate at which data quality is guaranteed. And
First error calculation reception data obtained by the first reception unit receiving error calculation transmission data transmitted from the data transmission device at the data transfer rate; and data from the data transmission device. Comparing the second error calculation reception data obtained by the second reception unit receiving the error calculation transmission data transmitted at a transfer rate at which quality is guaranteed, the two error calculations are performed. Error calculating means for calculating the degree of difference in data between received data for use as an error degree and determining the magnitude relationship between the calculated error degree and an allowable error degree determined in advance based on the type of digital data When,
With respect to the data transmission device, the transmission speed control instruction signal for instructing to adjust the data transfer rate, and a command signal transmitting unit for transmitting in response to by that determination result to the error calculation means ,
The data transmission device is
A first transmitter for transmitting digital data and error calculation transmission data to the data receiving device at the data transfer speed;
Second transmission for transmitting the error calculation transmission data having the same content as the error calculation transmission data transmitted from the first transmission unit to the data receiving apparatus at a transfer rate in which the quality of the data is guaranteed. And
An instruction signal receiving unit that receives a transfer rate control instruction signal for instructing to adjust the data transfer rate transmitted from the data receiving device;
A data transfer rate control unit configured to control the data transfer rate of the first transmission unit based on a transfer rate control instruction signal received by the command signal reception unit; system. A data transfer system in which a data receiving device receives digital data transmitted at a data transfer rate adjustable by the data transmitting device,
The data receiving device is:
Digital data and error calculation transmission data transmitted at the data transfer rate from the data transmission device, and error calculation transmitted at the data transfer rate transmitted at a transfer rate with guaranteed data quality Receiving unit for receiving error calculation transmission data having the same content as the transmission data for transmission;
The first error calculation reception data obtained by the reception unit receiving the error calculation transmission data transmitted from the data transmission device at the data transfer speed, and the data quality from the data transmission device are guaranteed. Compared with the second error calculation reception data obtained by the reception unit receiving the error calculation transmission data transmitted at the determined transfer rate, the data between the two error calculation reception data An error calculation means for calculating a magnitude relationship between the calculated error degree and an allowable error degree determined in advance based on the type of digital data ;
With respect to the data transmission device, the transmission speed control instruction signal for instructing to adjust the data transfer rate, and a command signal transmitting unit for transmitting in response to by that determination result to the error calculation means ,
The data transmission device is
The digital data and the error calculation transmission data are transmitted to the data receiving device at the data transfer rate, and the error calculation transmission data having the same content as the error calculation transmission data transmitted at the data transfer rate is transmitted. A transmitter that transmits data at a guaranteed transfer rate;
An instruction signal receiving unit that receives a transfer rate control instruction signal for instructing to adjust the data transfer rate transmitted from the data receiving device;
A data transfer system comprising: a transfer rate control unit that controls the data transfer rate of the transmission unit based on a transfer rate control instruction signal received by the instruction signal receiving unit.   A program for operating the data receiving device according to claim 1, wherein the program causes a computer to function as the error calculation unit.   A computer-readable recording medium on which the program according to claim 12 is recorded.

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