JP2004056594A - Adsl modulation and demodulation device and system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ADSL modulation and demodulation device which realizes equalizing process for communication environment without increasing circuit scale. <P>SOLUTION: The device is provided with a product sum computing unit 105, a data RAM 104 storing input data, a data register file 103 storing coefficient data, a control code queue 102 storing a control code of the computing unit, and a computing unit controller 101 controlling the product sum computing unit 105 based on the control code. The control code for the product sum computing unit 105 is provided from a host CPU 200, and is used for execution of equalizing process or the modulation and demodulation process. It is possible to provide the ADSL modulation and demodulation device which can execute high quality communication by that the host CPU measures line properties and make the product sum computing unit execute the most suitable equalizing process. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an LSI integrated circuit, and more particularly to a modulation / demodulation LSI for a digital subscriber line modem.
[0002]
[Prior art]
ITU-T standard G. 992.1 and G.I. The Asymmetric Digital Subscriber Line (ADSL) system standardized in 992.2 uses a twisted pair of metallic telephone lines to provide a digital data communication service having approximately 50 times the capacity of the conventional digital telephone service and a telephone / telephone line. This is a technology that can simultaneously provide facsimile services.
[0003]
In ADSL, metallic lines used as telephones, for example, G. In the case of the 992.1 recommendation, high-speed data transfer is realized by using a high frequency up to about 1 MHz.
[0004]
The main signal processing in the ADSL modem is fast Fourier transform (FFT) and fast inverse Fourier transform (IFFT), which are the core of DMT modulation and demodulation, and FIR, IIR filter, and frequency equalizer, which are the cores of frequency filters, equalizers, and echo cancellers. There are core complex multiplication and square cumulative sum calculation used for energy calculation and error amount calculation.
[0005]
[Problems to be solved by the invention]
If the digital signal processing as described above is to be processed by a general-purpose digital signal processor (DSP), the on-chip instruction memory capacity is increased due to the requirement of real-time signal processing, which leads to an increase in cost. In addition, instruction control corresponding to general-purpose signal processing becomes complicated, and the circuit scale increases.
[0006]
On the other hand, in hardware logic, the content of signal processing is fixedly determined, and therefore, the flexibility of signal processing is lacking. For this reason, it is not possible to cope with frequency characteristics and noise characteristics that vary depending on the installation location of the modem, and the communication quality deteriorates. If various arithmetic circuits for digital signal processing are mounted in order to prevent this, the number of circuits is increased, which leads to an increase in cost.
[0007]
The present invention has been made in view of the above problems, and has as its object to provide an ADSL modem capable of performing flexible signal processing without increasing the circuit scale.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an ADSL modem according to the present invention includes a control code storage unit for storing a control code supplied from an external central processing unit, a coefficient data storage unit for storing coefficient data, and a processing unit. A data storage unit for storing power data, a product-sum operation unit for performing a product-sum operation, and an operation unit control unit for controlling the operation unit, wherein the operation unit control unit is supplied from the control code storage unit. And causing the product-sum operation unit to perform an operation on the count data stored in the coefficient data storage unit and the data stored in the data storage unit in accordance with the control code.
[0009]
Further, in order to achieve the above object, an ADSL modulation / demodulation system according to the present invention is an ADSL modulation / demodulation system including a central processing unit and an ADSL modulation / demodulation device, wherein the ADSL modulation / demodulation device is supplied from the central processing unit. A control code storage unit that stores a control code to be processed, a coefficient data storage unit that stores coefficient data, a data storage unit that stores data to be processed, a product-sum operation unit that performs a product-sum operation, and the operation unit An arithmetic unit control unit that controls the count data stored in the coefficient data storage unit and the data storage unit according to a control code supplied from the control code storage unit. Causes the product-sum operation unit to perform an operation with the data stored in the CPU, and the central processing unit executes an appropriate program from a plurality of types of equalization processing programs. And-option, and supplying the control code of a program selected to the ADSL modem.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The ADSL modulation / demodulation device and the ADSL modulation / demodulation system of the present invention do not require non-real-time control code generation from the control code generator as in the conventional configuration by using the product-sum operation unit. A large-scale on-chip memory such as a general-purpose DSP is not required. Further, since the control code does not have a complicated control mechanism such as conditional branch control, the circuit scale of the controller can be reduced. Further, by facilitating a plurality of types of control codes such as FDSL and IFFT for ADSL modulation and demodulation and FIR and IIR for filter processing, processing of an equalizer and an echo canceller can be changed according to an installation environment. Therefore, it is possible to provide an ADSL modulation / demodulation device and an ADSL modulation / demodulation system capable of performing flexible signal processing without increasing the circuit scale.
[0011]
The ADSL modem of the present invention further comprises a counter, wherein the control code storage unit supplies the control code to the arithmetic unit control unit in accordance with a decoding result of the control code supplied from the central unit. It is preferable that the repetition is performed according to the value of the counter. According to this configuration, the specific control code stored in the control code storage unit can be repeatedly executed the number of times set by the central processing unit, which is advantageous in that processing efficiency is improved.
[0012]
In the ADSL modem of the present invention, the control code storage section stores a plurality of types of signal processing programs, selects one of the signal processing programs according to a control signal of a central processing unit, and selects the selected signal processing program. It is preferable to supply a control code of a program to the computing unit control unit. According to this configuration, it is not necessary to rewrite the control code from the host CPU every time the content of the operation in the product-sum operation unit is changed, so that the processing efficiency is advantageously improved. In this configuration, a counter is further provided, and the control code storage unit controls the supply of the control code to the arithmetic unit control unit in accordance with a decoding result of the control code supplied from the central unit, by the counter of the counter. You may comprise so that it may repeat according to a value.
[0013]
An ADSL modem according to the present invention includes a first decoder for decoding the control code, a second decoder for controlling access to the coefficient data storage unit, a counter, and a control code decoded by the first decoder. An operation unit control code storage unit that stores the counter output in accordance with a result of decoding the control code by the first decoder, wherein the operation unit control code storage unit stores the counter output and the first And a control code output to the second decoder in accordance with the control code decoded by the second decoder. The second decoder outputs a control code in accordance with a decoding result of the control code received from the arithmetic unit control code storage unit. It is preferable to access the coefficient data storage unit and the data storage device. According to this configuration, it is possible to execute processing with complicated control of address and repetition without adding to the central processing unit, which is advantageous in that processing efficiency is improved.
[0014]
In the ADSL modulation / demodulation system of the present invention, the ADSL modulation / demodulation device further includes a counter, and the control code storage unit transmits the control code to the arithmetic unit control unit in accordance with a decoding result of the control code supplied from the central unit. It is preferable that the supply of the control code is repeatedly performed according to the value of the counter.
[0015]
In the ADSL modulation / demodulation system of the present invention, the control code storage unit of the ADSL modulation / demodulation device stores a plurality of types of signal processing programs, and selects one of the signal processing programs according to a control signal of the central processing unit, It is preferable that the control code of the selected signal processing program is supplied to the arithmetic unit control unit.
[0016]
In the ADSL modulation / demodulation system of the present invention, the ADSL modulation / demodulation device further includes a counter, and the control code storage unit transmits the control code to the arithmetic unit control unit in accordance with a decoding result of the control code supplied from the central unit. It is preferable that the supply of the control code is repeatedly performed according to the value of the counter.
[0017]
An ADSL modulation / demodulation system according to the present invention includes an ADSL modulation / demodulation device including a first decoder for decoding the control code, a second decoder for controlling access to the coefficient data storage unit, a counter, and the first decoder. An arithmetic unit control code storage unit for storing the decoded control code is further provided, and the counter is operated in accordance with a result of decoding the control code by the first decoder, and the arithmetic unit control code storage unit A control code is output to the second decoder according to the counter output and the control code decoded by the first decoder, and the second decoder outputs a control code received from the arithmetic unit control code storage unit. An access is made to the coefficient data storage unit and the data storage device according to a code decoding result. Door is preferable.
[0018]
The ADSL modulation / demodulation system of the present invention further includes a selection history storage unit that stores an equalization process selected in the past by the central processing unit, and the central processing unit executes an equalization processing program based on the information in the selection history storage unit. It is preferred to make a selection.
[0019]
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
[0020]
(1st Embodiment)
FIG. 1 shows the configuration of the ADSL modulation / demodulation system according to the first embodiment of the present invention.
[0021]
As shown in FIG. 1, the ADSL modulation / demodulation system of the present embodiment includes an ADSL modem 100 and a host CPU 200 of a computer. The ADSL modem 100 includes a product-sum operation unit 105, an operation unit control unit 101, a control code queue 102, a data register file 103, and a data RAM 104.
[0022]
The product-sum calculator 105 has a variable combination of input signals, and is controlled by the calculator controller 101. The control code is stored in the control code queue 102. The data register file 103 stores coefficient data used in each digital operation process. A data register file 103 and a data RAM 104 storing an input signal (transmission data or reception data) are connected to a product-sum operation unit 105. The host CPU 200 writes the control code of the product-sum operation unit 105 in the control code queue 102. The host CPU 200 can also write arbitrary data in the data register file 103 by the control code written in the control code queue 102.
[0023]
Hereinafter, the operation of the ADSL modulation / demodulation system of the present embodiment will be described.
[0024]
The host CPU 200 writes, in the control code queue 102, a control code of an operation to be performed by the product-sum operation unit 105. The control codes stored in the control code queue 102 are sent to the arithmetic unit control unit 101. The arithmetic unit control unit 101 performs signal processing by sending control signals to the data register file 103, the data RAM 104, and the product-sum arithmetic unit 105 based on the control code. The arithmetic unit control unit 101 also executes address control of the data register file 103 and the data RAM 104. As this address control, it is possible to execute an address operation generally used in digital signal processing (for example, reverse carry addition or modulo addressing used in fast Fourier transform) and the like. When all the control codes in the control code queue 102 have been executed and no control code has been supplied from the host CPU 200, an empty signal is sent from the control code queue 102 to the host CPU 200, and the product-sum operation unit 105 is in the idle state. It becomes.
[0025]
By the above operation, in the ADSL modulation / demodulation system of the present embodiment, various signal processes executed in the ADSL are executed.
[0026]
For example, in the case of filter processing, an FIR filter can be configured by setting a tap coefficient of a filter in the data register file 103 and performing a product-sum operation with transmission data or reception data stored in the data RAM 104. In the case of the echo canceller, a data string to be canceled is set in the data register file 103, and processing can be performed by a similar product-sum operation.
[0027]
Further, the same processing can be performed for the IIR filter used in the equalizer processing. At this time, although the address operation is complicated as compared with the FIR filter operation, the arithmetic unit control unit 101 is designed to execute the corresponding address operation.
[0028]
In the case of performing the energy calculation or the cumulative addition of the error amount, the processing can be performed by accumulating the sum of squares of the data stored in the data RAM 104 in the product-sum operation unit 105.
[0029]
In the case of the fast Fourier transform (FFT) or the fast inverse Fourier transform (IFFT), although slightly complicated, by controlling the read addresses of the data RAM 104 and the data register file 103 and the operation result storage address in the data RAM 104, , Processing is possible.
[0030]
In ADSL, the content of the necessary computation and the amount of processing vary depending on the environment of the metallic line connecting the exchange and the place where the modem is installed. By installing the ADSL modem 100, it becomes possible for the host CPU 200 to control the amount of processing of filters and equalizations executed by the multiply-accumulation unit 105 and the contents thereof, so that optimal digital arithmetic processing according to the environment of the metallic line can be performed. It becomes possible.
[0031]
(Second embodiment)
FIG. 2 shows the configuration of the ADSL modulation / demodulation system according to the second embodiment of the present invention. As shown in FIG. 2, the ADSL modulation / demodulation system of the present embodiment has an ADSL modem 110 and a host CPU 200. The ADSL modem 110 includes a product-sum operation unit 105, an operation unit control unit 101, a control code queue 102, a data register file 103, a data RAM 104, and a counter 106.
[0032]
That is, the configuration of the ADSL modulation / demodulation system of the present embodiment is different from that of the ADSL modulation / demodulation system of the first embodiment in that a down counter 106 is connected to the control code queue 102. The value of the down counter 106 can be set from the host CPU 200.
[0033]
Hereinafter, the operation of the ADSL modulation / demodulation system will be described.
[0034]
As in the first embodiment, the control code is stored in the control code queue 102 from the host CPU 200, and the control code is sent to the arithmetic unit control unit 101. In the control code queue 102, according to the bit set in the control code, if the setting is such that the repetition is not performed, the corresponding control code is transmitted to the computing unit control unit 101 only once, and the setting for performing repetition In the case of, the same code is sent to the arithmetic unit control unit 101 until the value of the down counter 105 becomes zero.
[0035]
When the down counter 106 is set to 0, the control code is sent once from the control code queue 102 to the computing unit control unit 101, and the next stored control code is executed. If N is set in the down counter, the same control code is sent from the control code queue 102 to the arithmetic unit control unit 101 (N + 1) times, and the execution is repeatedly performed.
[0036]
With the above configuration, it is possible to repeatedly execute a specific control code stored in the control code queue 102 a number of times set by the host CPU 200. This is effective for the FIR filter operation used for the filter processing and the echo canceller, and the square cumulative addition used for the energy calculation and the error amount calculation. With the above-described configuration, it is possible to eliminate the need for the host CPU 200 to send the same code to the control code queue 102, and to increase the processing efficiency.
[0037]
(Third embodiment)
FIG. 3 shows the configuration of the ADSL modulation / demodulation system according to the third embodiment of the present invention. As shown in FIG. 3, the ADSL modulation / demodulation system of the present embodiment includes an ADSL modem 120 and a host CPU 200. The ADSL modem 120 includes a product-sum operation unit 105, an operation unit control unit 101, a control code queue 102, a data register file 103, and a data RAM 104.
[0038]
In this configuration, a plurality of control code storage devices 102A, 102B, 102C are prepared as the control code queue 120, and different signal processing programs are stored in each of these devices. For example, in FIG. 3, the signal processing program of the FIR filter is stored in the control code storage device 102A, the IIR filter program is stored in the control code storage device 102B, and the square accumulation program is stored in the control code storage device 102C. You.
[0039]
A host control signal is sent from the host CPU 200 to the plurality of control code queues 102 as described above. By receiving this control signal, a control code is sent from any one of the control code storage devices 102A, 102B, 102C to the arithmetic unit control unit 101, and the operation is executed.
[0040]
This makes it unnecessary to rewrite the control code from the host CPU 200 every time the operation content is changed when the product-sum operation unit 105 executes a plurality of digital signal processes, thereby increasing the efficiency of the process.
[0041]
In the present embodiment, an example has been described in which the control code queue 102 is configured by three control code storage devices 102A, 102B, and 102C. However, the number of control code storage devices configuring the control code queue 102, Are not limited to the above-described specific examples.
[0042]
(Fourth embodiment)
The ADSL modulation / demodulation system according to the fourth embodiment of the present invention has a configuration in which an ADSL modem 130 and a host CPU 200 are connected as shown in FIG. Down counters 106A to 106C are connected to the control code storage devices 102A to 102C, respectively. The functions and operations of the control code storage devices 102A to 102C are as described in the third embodiment. The functions and operations of the down counters 106A to 106C are the same as those of the down counter 106 described in the second embodiment.
[0043]
In the present embodiment, the example in which the control code queue 102 is configured by the three control code storage devices 102A, 102B, and 102C has been described. However, the number of control code storage devices included in the control code queue 102, Are not limited to the above-described specific examples.
[0044]
(Fifth embodiment)
FIG. 5 shows the configuration of an ADSL modulation / demodulation system according to the fifth embodiment of the present invention. As shown in FIG. 5, the ADSL modem system of the present embodiment has a configuration in which an ADSL modem 140 and a host CPU 200 are connected. The ADSL modem 140 includes a product-sum calculator 105, a calculator control code register file 108, a control code queue 102, a data register file 103, a data RAM 104, a down counter 106, a first decoder 107, and a second decoder 109. I have.
[0045]
In this configuration, the control code is sent from the control code queue 102 to the first decoder 107. The first decoder 107 outputs a control signal to the down counter 106 and the arithmetic unit control code register file 108 from the decoding result. The down counter 106 operates the counter based on the control signal and outputs the counter value to the arithmetic unit control code register file 108. The arithmetic unit control code register file 108 outputs an arithmetic unit control code to the second decoder 109 with reference to the decoding result of the first decoder 107 and the counter value of the down counter 106. The second decoder 109 outputs the control code to the product-sum operation unit 105 and the address to the data register file 103 and the data RAM 104 based on the operation unit control code, and executes the product-sum operation.
[0046]
In addition, as a result of the first decoder 107 decoding the control code sent from the control code queue 102, a value can be written to the data register file 103.
[0047]
Hereinafter, the operation of the ADSL modulation / demodulation system will be described.
[0048]
The operation unit control code register file 108 stores operation codes that can be executed by the product-sum operation unit 105 in advance. The operation code is registered in addition to the modification operation of the address pointer in consideration of the access pattern of the data register file 103 and the data RAM 104.
[0049]
The control code queue 102 stores control codes for controlling the order in which the operation codes stored in the operation unit control code register file 108 are read. Here, a control code such as activating the counter 106 and repeatedly outputting a control code output from the arithmetic unit control code register file 108 to the second decoder 109 is also stored.
[0050]
This makes it possible to execute processing such as FFT or IFFT in which the control of addresses and repetition is complicated without imposing a load on the host CPU 200, thereby achieving higher processing efficiency.
[0051]
(Sixth embodiment)
FIG. 6 shows the configuration of an ADSL modulation / demodulation system according to the sixth embodiment of the present invention. As shown in FIG. 6, the ADSL modulation / demodulation system according to the present embodiment differs from the ADSL modulation / demodulation system according to the first embodiment in that a storage device 201 is provided in addition to the ADSL modem 100 and the host CPU 200. . The storage device 201 stores a control program for the host CPU 200 and is accessed by the host CPU 200. As described in the first embodiment, the ADSL modem 100 includes the product-sum operation unit 105, the operation unit control unit 101, the control code queue 102, the data register file 103, and the data RAM 104.
[0052]
Further, the storage device 201 stores a plurality of control codes for controlling various signal processing such as FIR processing, IIR processing, FFT processing, and equalizer processing as described in the first embodiment. The host CPU 200 prepares programs such as an FIR filter, an IIR filter, and an FFT in a control program, and finally selects an arithmetic process having the highest communication quality.
[0053]
FIG. 7 shows an example of the processing flow as a flowchart.
[0054]
At the stage when the training of the ADSL modem has started, the line characteristics are roughly measured (step S1). Based on the result obtained from this, the host CPU 200 selects the optimal code for equalization and loads it into the control code queue 102 (step S2). Thereafter, a detailed circuit measurement is performed (step S3), the value of the data register file is determined (step S4), and actual data communication is performed (step S5).
[0055]
By performing the above operation, it is possible to realize an ADSL modulation / demodulation system capable of performing an optimal equalization process for an ADSL having a different communication environment depending on the installation location.
[0056]
(Seventh embodiment)
FIG. 8 shows the configuration of an ADSL modulation / demodulation system according to the seventh embodiment of the present invention. As shown in FIG. 6, the ADSL modulation / demodulation system of the present embodiment is different from the ADSL modulation / demodulation system of the second embodiment in that a storage device 201 is provided in addition to the ADSL modem 110 and the host CPU 200. . The storage device 201 stores a control program for the host CPU 200 and is accessed by the host CPU 200. As described in the second embodiment, the ADSL modem 110 includes the product-sum operation unit 105, the operation unit control unit 101, the control code queue 102, the data register file 103, the data RAM 104, and the down counter 106.
[0057]
(Eighth embodiment)
As shown in FIG. 9, an ADSL modulation / demodulation system according to an eighth embodiment of the present invention has a configuration according to the third embodiment (see FIG. 3) and a storage device 201 (FIG. 6) according to the sixth embodiment. ) Is combined.
[0058]
(Ninth embodiment)
As shown in FIG. 10, an ADSL modulation / demodulation system according to a ninth embodiment of the present invention has a configuration according to the fourth embodiment (see FIG. 4) and a storage device 201 (FIG. 6) according to the sixth embodiment. ) Is combined.
[0059]
(Tenth embodiment)
As shown in FIG. 11, an ADSL modulation / demodulation system according to a tenth embodiment of the present invention has a configuration according to the fifth embodiment (see FIG. 5) and a storage device 201 (FIG. 6) according to the sixth embodiment. ) Is combined.
[0060]
(Eleventh embodiment)
FIG. 12 shows the configuration of the ADSL modulation / demodulation system according to the eleventh embodiment of the present invention. As shown in FIG. 12, the ADSL modulation / demodulation system of this embodiment includes storage devices 202 and 203 in addition to the ADSL modem 100 and the host CPU 200 described in the first embodiment.
[0061]
The storage device 202 is connected to the host CPU 200 and stores control codes for equalization. The host CPU 200 is also connected to a storage device 203 for storing an equalizing control code selected in the past. Based on the information stored in the storage device 203, the control code is loaded into the control code queue 102 of the ADSL modem via the host CPU 200, and a process such as equalization is performed.
[0062]
Here, an example of a specific process of the ADSL modulation / demodulation system is shown in FIG.
[0063]
When starting up the modem, it is first determined whether to use the previous equalization result (step S11). In this case, complete initialization is performed when the modem has just been installed or when the previous connection has terminated with an error (for example, a reset has occurred due to an increase in the amount of communication errors). Alternatively, there may be a case where the setting is made by the user.
[0064]
If the initialization is selected, the processes of steps S12 to S18 are performed in the same manner as in the flowchart of FIG. 7, and the content of the final equalization process is stored in the storage device 203. When restoring the previous equalization result, the previous processing content and parameters are extracted from the storage device 203 and data communication is performed.
[0065]
In ADSL, once the modem is installed, the environment of the metallic line used is unlikely to change significantly. If the environment changes significantly, the line characteristics cannot be handled by the equalization processing up to that point, so that the amount of communication errors increases and the processing ends with an error. In this case, as shown in the flowchart of FIG. 13, the line characteristics are measured again from the beginning, so that equalization processing according to the new line characteristics can be performed.
[0066]
From the above, by saving the previous environment, it is possible to omit the equalization selection processing, and it is possible to reduce the time from turning on the power of the modem to starting communication.
[0067]
(Twelfth embodiment)
The twelfth embodiment of the present invention is configured by combining the ADSL modulation / demodulation system (see FIG. 6) according to the sixth embodiment with the storage devices 202 and 203 according to the eleventh embodiment. Illustration is omitted.
[0068]
(Thirteenth embodiment)
The thirteenth embodiment of the present invention is configured by combining the ADSL modulation / demodulation system according to the seventh embodiment (see FIG. 8) with the storage devices 202 and 203 according to the eleventh embodiment. Illustration is omitted.
[0069]
(14th embodiment)
The fourteenth embodiment of the present invention is configured by combining the ADSL modulation / demodulation system (see FIG. 9) according to the eighth embodiment with the storage devices 202 and 203 according to the eleventh embodiment. Illustration is omitted.
[0070]
(Fifteenth embodiment)
The fifteenth embodiment of the present invention is configured by combining the ADSL modulation / demodulation system according to the ninth embodiment (see FIG. 10) with the storage devices 202 and 203 according to the eleventh embodiment. Illustration is omitted.
[0071]
【The invention's effect】
In the product-sum operation unit as shown in the above embodiment, since a non-real-time control code generation from the control code generator is unnecessary, a large-scale on-chip memory such as a general-purpose DSP is not required as the control code generator. In addition, since the control code does not have a complicated control mechanism such as conditional branching control, the area of the controller can be reduced by reducing the circuit size of the controller, and a low-cost modulation / demodulation LSI can be provided. Becomes possible. Further, the processing of the equalizer and the echo canceller can be changed in accordance with the environment of the installed modem, thereby contributing to the improvement of the communication quality.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of the present invention.
FIG. 2 is a diagram showing a second embodiment of the present invention.
FIG. 3 is a diagram showing a third embodiment of the present invention.
FIG. 4 is a diagram showing a fourth embodiment of the present invention.
FIG. 5 is a diagram showing a fifth embodiment of the present invention.
FIG. 6 is a diagram showing a sixth embodiment of the present invention.
FIG. 7 is a flowchart illustrating a processing flow of an ADSL modulation / demodulation system according to a sixth embodiment of the present invention.
FIG. 8 is a diagram showing a seventh embodiment of the present invention.
FIG. 9 is a diagram showing an eighth embodiment of the present invention.
FIG. 10 is a diagram showing a ninth embodiment of the present invention.
FIG. 11 is a diagram showing a tenth embodiment of the present invention.
FIG. 12 is a diagram showing an eleventh embodiment of the present invention.
FIG. 13 is a flowchart illustrating a processing flow of an ADSL modulation / demodulation system according to an eleventh embodiment of the present invention.
[Explanation of symbols]
100 ADSL modem
101 arithmetic unit controller
102 Control code queue
103 Data register file
104 Data RAM
105 Multiply-accumulate operator
106 Down counter
107 First decoder
108 Operation unit control code register file
109 Second decoder
200 Host CPU
201 control program storage device
202, 203 storage device

Claims (11)

A control code storage unit for storing a control code supplied from an external central processing unit, a coefficient data storage unit for storing coefficient data, a data storage unit for storing data to be processed, and a product-sum operation for performing a product-sum operation A computing unit, comprising a computing unit control unit that controls the computing unit,
The computing unit control unit performs an operation on the count data stored in the coefficient data storage unit and the data stored in the data storage unit according to the control code supplied from the control code storage unit. An ADSL modulation / demodulation device characterized in that the ADSL modulation / demodulation device performs the calculation. Further equipped with a counter,
2. The control code storage unit according to claim 1, wherein the control code storage unit repeatedly supplies the control code to the arithmetic unit control unit in accordance with a value of the counter according to a decoding result of the control code supplied from the central device. 3. ADSL modem. The control code storage unit stores a plurality of types of signal processing programs,
The ADSL modem according to claim 1, wherein one of the signal processing programs is selected according to a control signal of a central processing unit, and a control code of the selected signal processing program is supplied to the arithmetic unit control unit. Further equipped with a counter,
4. The control code storage unit according to claim 3, wherein the control code storage unit repeatedly supplies the control code to the arithmetic unit control unit according to a value of the counter according to a decoding result of the control code supplied from the central device. 5. ADSL modem. A first decoder for decoding the control code, a second decoder for controlling access to the coefficient data storage unit, a counter, and an arithmetic unit control code storage for storing the control code decoded by the first decoder And a part,
Operating the counter according to the result of decoding the control code by the first decoder;
The computing unit control code storage unit outputs a control code to the second decoder according to the counter output and the control code decoded by the first decoder;
2. The ADSL modem according to claim 1, wherein the second decoder accesses the coefficient data storage unit and the data storage device in accordance with a result of decoding the control code received from the arithmetic unit control code storage unit. . An ADSL modulation / demodulation system including a central processing unit and an ADSL modulation / demodulation device,
The ADSL modem includes a control code storage unit that stores a control code supplied from the central processing unit, a coefficient data storage unit that stores coefficient data, a data storage unit that stores data to be processed, A multiply-accumulate operation unit for performing an operation, and an operation unit control unit that controls the operation unit,
The computing unit control unit performs an operation on the count data stored in the coefficient data storage unit and the data stored in the data storage unit according to the control code supplied from the control code storage unit. Let the product-sum unit perform
An ADSL modulation / demodulation system, wherein the central processing unit selects an appropriate program from a plurality of types of equalization processing programs, and supplies a control code of the selected program to the ADSL modem. In the ADSL modem, a counter is further provided, and the control code storage unit supplies the control code to the arithmetic unit control unit in accordance with a decoding result of the control code supplied from the central unit. The ADSL modulation / demodulation system according to claim 6, wherein the ADSL modulation / demodulation is performed repeatedly according to the value of the counter. In the ADSL modem, the control code storage section stores a plurality of types of signal processing programs, and selects one of the signal processing programs in accordance with a control signal of the central processing unit. The ADSL modulation / demodulation system according to claim 6, wherein a control code of a program is supplied to the arithmetic unit control unit. In the ADSL modem, a counter is further provided, and the control code storage unit supplies the control code to the arithmetic unit control unit in accordance with a decoding result of the control code supplied from the central unit. The ADSL modulation / demodulation system according to claim 8, wherein the ADSL modulation / demodulation is performed repeatedly according to the value of the counter. In the ADSL modem, a first decoder for decoding the control code, a second decoder for controlling access to the coefficient data storage unit, a counter, and a control code decoded by the first decoder are stored. An operation unit control code storage unit for operating the counter in accordance with a result of decoding the control code by the first decoder, wherein the operation unit control code storage unit stores the counter output and the first A control code is output to the second decoder in accordance with the control code decoded by the second decoder, and the second decoder outputs a control code in accordance with a result of decoding the control code received from the arithmetic unit control code storage unit. 7. The ADS according to claim 6, wherein the access to the coefficient data storage unit and the data storage device is performed. Modulation and demodulation system. The apparatus further includes a selection history storage unit that stores an equalization process selected in the past by the central processing unit,
The ADSL modulation / demodulation system according to any one of claims 6 to 10, wherein the central processing unit selects an equalization processing program based on information in the selection history storage unit.

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