WO2012017732A1 - 送信装置、受信装置および送受信システム - Google Patents
送信装置、受信装置および送受信システム Download PDFInfo
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- WO2012017732A1 WO2012017732A1 PCT/JP2011/062717 JP2011062717W WO2012017732A1 WO 2012017732 A1 WO2012017732 A1 WO 2012017732A1 JP 2011062717 W JP2011062717 W JP 2011062717W WO 2012017732 A1 WO2012017732 A1 WO 2012017732A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/156—Arrangements in which a continuous pulse train is transformed into a train having a desired pattern
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
- H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
- H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
- H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
- H04L7/0337—Selecting between two or more discretely delayed clocks or selecting between two or more discretely delayed received code signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
Definitions
- the present invention relates to a transmission device, a reception device, and a transmission / reception system.
- a clock generation technique using spread spectrum is known as a technique for reducing EMI (electromagnetic interference) noise caused by the clock.
- EMI electromagnetic interference
- This SS technology temporally modulates the frequency of the clock transmitted from the transmission device to the reception device, thereby expanding the bandwidth of the frequency spectrum of the clock and reducing the peak intensity of the frequency spectrum. This is intended to reduce EMI noise.
- a transmission apparatus employing such SS technology needs to include a spread spectrum clock generator (SSCG) for generating a clock whose frequency is temporally modulated.
- SSCG spread spectrum clock generator
- Patent Documents 1 to 11 disclose inventions related to SS technology and SSCG.
- a transmission apparatus that employs a conventional SS technology and includes a conventional SSCG has a large circuit scale, and when configured by a semiconductor integrated circuit, has a large semiconductor chip area.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a transmission apparatus capable of reducing EMI noise while suppressing an increase in circuit scale.
- the present invention also provides a receiving apparatus suitable for receiving a clock and data transmitted from such a transmitting apparatus, and such a transmitting apparatus and receiving apparatus for transmitting and receiving data with low noise.
- Another object of the present invention is to provide a transmission / reception system capable of performing the above.
- a transmission device of the present invention includes a clock transmission unit that generates and transmits a clock that is intermittently phase-shifted, and a data transmission unit that transmits data in synchronization with the clock transmitted by the clock transmission unit. It is characterized by providing.
- the clock transmission unit may generate and send a clock given a phase shift by switching a clock selected from among the multiphase clocks.
- the clock transmission unit may transmit the clock with a phase shift at the timing of transmission of specific data among the data transmitted from the data transmission unit.
- the data transmission unit transmits a phase shift notification command for notifying the phase shift timing when a phase shift is given to the clock transmitted from the clock transmission unit.
- the data transmission unit preferably transmits a phase shift notification command immediately before the phase shift is given to the clock transmitted from the clock transmission unit. Further, it is preferable that the data transmission unit transmits dummy data following the phase shift notification command.
- the receiving device of the present invention is a receiving device that receives a clock and data transmitted from the transmitting device in synchronization with each other, and is received by (1) a clock receiving unit that receives the clock and (2) a clock receiving unit.
- a data receiver that samples and receives data in synchronization with the clock, and (3) the data received by the data receiver is received by the clock receiver and the data received by the data receiver, respectively.
- a data processing unit for invalidating data reception by the data receiving unit at a timing notified by the phase shift notification command when the phase shift notification command notifies the timing at which the phase shift occurs .
- the transmission / reception system of the present invention comprises (1) the above-described transmission device and reception device of the present invention, and (2) the clock reception unit of the reception device receives the clock transmitted by the clock transmission unit of the transmission device, (3) The data receiving unit of the receiving device receives the data transmitted by the data transmitting unit of the transmitting device, and (4) the data processing unit of the receiving device is transmitted by the data transmitting unit of the transmitting device and When the data received by the data receiving unit is a phase shift notification command, data reception by the data receiving unit at the timing notified by the phase shift notification command is invalidated.
- FIG. 1 is a diagram illustrating a configuration of a transmission device 10 of a comparative example.
- FIG. 2 is a diagram illustrating a temporal change in the frequency of the clock clock2 output from the transmission apparatus 10 of the comparative example.
- FIG. 3 is a diagram illustrating a frequency spectrum of the clock clock2 output from the transmission device 10 of the comparative example.
- FIG. 4 is a diagram illustrating a temporal change in the phase of the clock clock2 output from the transmission apparatus 10 of the comparative example.
- FIG. 5 is a diagram illustrating a configuration of the transmission device 10A according to the first embodiment.
- FIG. 6 is a timing chart of clocks clock1, clock2, clock3, etc. in the transmitting apparatus 10A of the first embodiment.
- FIG. 7 is a timing chart of data and clocks output from the transmitting apparatus 10A of the first embodiment.
- FIG. 8 is a diagram illustrating an example of a frequency spectrum of a clock output from the transmission device 10A according to the first embodiment.
- FIG. 9 is a diagram illustrating another example of the frequency spectrum of the clock output from the transmission device 10A of the first embodiment.
- FIG. 10 is a diagram showing a clock waveform and a frequency spectrum when SS is not applied.
- FIG. 11 is a diagram showing a clock waveform and a frequency spectrum when the phase is shifted by ⁇ every 10 pulses in the first embodiment.
- FIG. 12 is a diagram showing a clock waveform and a frequency spectrum when the phase is shifted by ⁇ every 9 pulses and every 7 pulses in the first embodiment.
- FIG. 13 is a diagram illustrating a configuration of a transmission device 10B according to the second embodiment.
- FIG. 14 is a diagram illustrating a configuration of a transmission device 10C according to the third embodiment.
- FIG. 15 is a timing chart of clocks clock1 and clock2 in the transmission apparatus 10C of the third embodiment.
- FIG. 16 is a diagram for explaining the relationship between the lengths of the data signal line and the clock signal line from the transmission device to the reception device.
- FIG. 17 is a diagram for explaining a delay time difference when SS application is not performed.
- FIG. 18 is a diagram for explaining the delay time difference when the SS application of the comparative example is performed.
- FIG. 19 is a diagram illustrating a configuration of a transmission device 10D according to the fourth embodiment.
- FIG. 20 is a timing chart of each data in the transmission device 10D of the fourth embodiment.
- FIG. 21 is a diagram illustrating a configuration of the receiving device 30 according to the fourth embodiment.
- FIG. 22 is a timing chart of each data in the receiving device 30 of the fourth embodiment.
- FIG. 23 is a timing chart of data and a clock in a transmission / reception system including the transmission device 10D and the reception device 30 according to the fourth embodiment.
- FIG. 24 is a diagram illustrating a configuration example of the transmission / reception system 1 of the fourth embodiment.
- FIG. 25 is a timing chart of data and clocks in the transmission / reception system 1 of the fourth embodiment.
- FIG. 1 is a diagram illustrating a configuration of a transmission device 10 of a comparative example.
- the transmission device 10 of the comparative example includes a transmission data generation unit 11 and an output buffer unit 12.
- the transmission data generation unit 11 generates data data1 and a clock clock1 to be sent to the receiving device, and outputs them to the output buffer unit 12.
- the output buffer unit 12 includes a data transmission unit 13 and a clock transmission unit 14.
- the data transmission unit 13 is connected to the reception device via a high-speed serial data line.
- the data transmission unit 13 includes a FIFO (first-in first-out) memory.
- the data data1 output from the transmission data generation unit 11 is input to and stored in the FIFO memory, and the data stored in the FIFO memory
- the dummy data added as necessary is output to the receiving device as data data2.
- the timing at which the FIFO memory of the data transmission unit 13 inputs and stores the data data1 is instructed by the clock clock1 output from the transmission data generation unit 11.
- the timing at which the FIFO memory of the data transmission unit 13 outputs the data data2 is specified by the clock clock2 output from the clock transmission unit 14.
- the clock transmission unit 14 is connected to a receiving device via a clock line.
- the clock transmission unit 14 includes an SSCG, inputs the clock clock1 output from the transmission data generation unit 11, and outputs the clock clock2 generated by temporally modulating the frequency (SS application) of the clock clock1. .
- the clock clock2 output from the clock transmission unit 14 is used as a signal for instructing output of data data2 from the FIFO memory of the data transmission unit 13 in addition to being transmitted to the reception device. As a result, the data transmission unit 13 can transmit data data2 in synchronization with the clock clock2 transmitted by the clock transmission unit 14.
- FIG. 2 is a diagram illustrating a temporal change in the frequency of the clock clock2 output from the transmission device 10 of the comparative example.
- the clock clock1 before SS application has a constant frequency f0
- the frequency of the clock clock2 after SS application is modulated in a triangular wave shape.
- the modulation frequency of the clock clock2 is fmod (the modulation period is 1 / fmod)
- the center frequency of the clock clock2 is f0
- the modulation amplitude of the clock clock2 is ⁇ f.
- FIG. 3 is a diagram illustrating a frequency spectrum of the clock clock2 output from the transmission device 10 of the comparative example.
- the frequency spectrum of the clock clock1 before SS application is concentrated at the frequency f0, whereas the frequency spectrum of the clock clock2 after SS application as shown in FIG. 2 has a width 2 ( ⁇ f + fmod centered on the frequency f0). ) And the peak intensity is reduced. Thereby, reduction of EMI noise can be aimed at.
- FIG. 4 is a diagram illustrating a temporal change in the phase of the clock clock2 output from the transmission device 10 of the comparative example.
- the phase of the clock clock2 after application of SS is obtained by integrating the frequency f (t) shown in FIG.
- f (t) the frequency shown in FIG.
- the amplitude ⁇ ph of the phase fluctuation of the clock clock2 after applying SS is expressed by the following equation (1).
- the phase fluctuation amplitude ⁇ ph is 250 ⁇ 2 ⁇ (rad).
- the variation of the phase of the clock clock2 after the application of SS is about ⁇ 250 cycles at maximum.
- the clock transmission unit 14 of the transmission device 10 of the comparative example includes an SSCG for generating and outputting the clock clock2 after the application of SS as shown in FIG.
- the SSCG basically has a PLL (phase lock loop) circuit configuration, and generates and outputs a clock clock2 frequency-modulated by the PLL circuit.
- PLL phase lock loop
- an SSCG including such a PLL circuit has a large circuit scale and is vulnerable to noise.
- the data transmission unit 13 of the transmission device 10 of the comparative example inputs the data data1 in synchronization with the clock clock1 before the application of SS, and outputs the data data2 in synchronization with the clock clock2 after the application of SS.
- the output data data2 has the above phase difference of ⁇ ph with respect to the input data data1.
- the transmission apparatus 10 needs to include a FIFO memory. The larger the phase variation amplitude ⁇ ph of the clock clock2 after applying SS, the greater the capacity of the FIFO memory. Therefore, such a FIFO memory also has a large circuit scale.
- the transmission device 10 of the comparative example has a large circuit scale, and a semiconductor chip area is large when it is configured by a semiconductor integrated circuit.
- the transmitting apparatuses 10A to 10D of the present embodiment described below do not need to include SSCG because the clock transmitting unit generates and transmits a clock with intermittent phase shift. EMI noise can be reduced while suppressing an increase in circuit scale.
- FIG. 5 is a diagram illustrating a configuration of the transmission device 10A according to the first embodiment.
- the transmission device 10A of the first embodiment includes a transmission data generation unit 11 and an output buffer unit 12A.
- the transmission data generation unit 11 generates data data1 and a clock clock1 to be sent to the receiving device, and outputs them to the output buffer unit 12A.
- the output buffer unit 12A includes a data transmission unit 13 and a clock transmission unit 14A.
- the transmission device 10A of the first embodiment shown in FIG. 5 is different in that an output buffer unit 12A is provided instead of the output buffer unit 12. Further, the difference is that a clock transmission unit 14A is provided instead of the clock transmission unit 14.
- the clock transmission unit 14A includes a PLL 15, a counter 16, and a clock inversion unit 17.
- the clock transmission unit 14A can generate a clock clock2 that is intermittently given a phase shift based on the input clock clock1, and can transmit the clock clock2. .
- the clock clock2 to which the phase shift is intermittently applied is the same as the clock clock2 in which the voltage amplitude is intermittently inverted if the amount of the phase shift is ⁇ (180 degrees).
- the PLL 15 receives the clock clock1 output from the transmission data generation unit 11, generates a clock clock3 having a frequency obtained by multiplying the frequency of the input clock clock1 by a certain value, and outputs the clock clock3.
- the counter 16 receives the clock clock 3 output from the PLL 15, counts the pulses of the clock clock 3, and outputs a clock inversion control signal that becomes a significant value only for a certain period for every certain number of pulses.
- the clock inversion unit 17 receives the clock clock3 output from the PLL 15 and the clock inversion control signal output from the counter 15, and each time the clock inversion control signal becomes a significant value, the positive phase of the clock clock3 is changed. Switch to reverse phase and output as clock clock2.
- the data transmitting unit 13 transmits data data2 in synchronization with the clock clock2 output from the clock inverting unit 17 of the clock transmitting unit 14A.
- FIG. 6 is a timing chart of clocks clock1, clock2, clock3, etc. in the transmission apparatus 10A of the first embodiment.
- the clock clock 1 input to the PLL 15, the clock clock 3 output from the PLL 15, the inverted signal of the clock clock 3, the clock inversion control signal output from the counter 15, and the clock inversion unit 17
- the output clock clock2 is shown.
- the frequency of the clock clock3 output from the PLL15 is 21/20 times the frequency of the clock clock1 input to the PLL15. That is, the period of 21 pulses of the clock clock3 is equal to the period of 20 pulses of the clock clock1.
- the edge of pulse # 21 of clock clock3 has the same timing as the edge of pulse # 20 of clock clock1.
- the clock inversion control signal output from the counter 15 becomes a high level only for a certain period every 10 pulses of the clock clock3.
- the clock clock2 output from the clock inverting unit 17 switches between the normal phase and the reverse phase of the clock clock3 every time the clock inversion control signal becomes high level (that is, every 10 pulses of the clock clock3). And the phase is shifted by ⁇ .
- the clock clock2 output from the clock inverting unit 17 lacks the one corresponding to the edge of the pulse # 11 of the clock clock3 output from the PLL15. Accordingly, 21 pulses of the clock clock3 are generated during a period of 20 pulses of the clock clock1, and 20 pulses of the clock clock2 are generated.
- FIG. 7 is a timing chart of data and clocks output from the transmission apparatus 10A of the first embodiment.
- the clock has no phase shift.
- the clock is intermittently phase-shifted by ⁇ .
- the receiving device that receives the data and clock output from the transmitting device 10A may sample the data at the edge of the clock pulse.
- FIG. 8 is a diagram illustrating an example of a frequency spectrum of a clock output from the transmission device 10A of the first embodiment.
- the frequency spectrum of the clock clock1 is concentrated at the frequency f0, whereas the frequency spectrum of the clock clock2 output from the transmitting apparatus 10A of the first embodiment has no frequency f0 component, and f0 ⁇ fmod / 2, f0. It has a peak at ⁇ fmod, f0 ⁇ 3fmod / 2,..., And the peak intensity is reduced. Thereby, reduction of EMI noise can be aimed at.
- fmod is a frequency of timing for giving a phase shift to the clock.
- the clock output from the transmitting apparatus 10A is given a phase shift for each fixed number of pulses (that is, at a fixed frequency fmod).
- the clock clock2 output from the transmission apparatus 10A may be given a phase shift every N1 pulse and every N2 pulse.
- the frequency dividing ratio of the PLL 15 is (N1 + N2 + 1) / (N1 + N2), and the counter 16 outputs a clock inversion control signal that becomes a significant value only for a certain period each time the number of pulses N1 and N2 of the clock clock3 is counted. That's fine.
- FIG. 9 is a diagram illustrating another example of the frequency spectrum of the clock output from the transmission device 10A of the first embodiment.
- FIGS. 10A and 10B are diagrams showing a clock waveform and a frequency spectrum when SS is not applied.
- FIG. 10A shows a clock waveform
- FIG. 10B shows a frequency spectrum.
- FIG. 11 is a diagram showing a clock waveform and a frequency spectrum when the phase is shifted by ⁇ every 10 pulses in the first embodiment.
- FIG. 11A shows the clock waveform
- FIG. 11B shows the frequency. Shows the spectrum.
- FIG. 12 is a diagram showing a clock waveform and a frequency spectrum when the phase is shifted by ⁇ every 9 pulses and every 7 pulses in the first embodiment.
- FIG. 12 (a) shows a clock whose phase is shifted every 9 pulses.
- the waveform (b) shows the clock waveform shifted in phase every 7 pulses
- (c) shows the frequency spectrum.
- the peak intensity of the spectrum is reduced when the phase is shifted by ⁇ every 10 pulses (FIG. 11) compared to when SS is not applied (FIG. 10), and every 9 pulses and 7 pulses.
- the phase is shifted every time (FIG. 12)
- the peak intensity of the spectrum is further reduced.
- the transmission device 10 of the comparative example requires an SSCG and FIFO memory having a large circuit scale, whereas the transmission device 10A of the first embodiment includes a PLL having a fixed frequency division ratio and a FIFO memory having a low capacitance value. Therefore, it is possible to reduce EMI noise while suppressing an increase in circuit scale, and in the case of a semiconductor integrated circuit, the semiconductor chip area is small.
- FIG. 13 is a diagram illustrating a configuration of the transmission device 10B of the second embodiment.
- the transmission device 10B of the second embodiment includes a transmission data generation unit 11 and an output buffer unit 12B.
- the transmission data generation unit 11 generates data data1 and a clock clock1 to be sent to the receiving device, and outputs them to the output buffer unit 12B.
- the output buffer unit 12B includes a data transmission unit 13 and a clock transmission unit 14B.
- the transmission device 10B of the second embodiment shown in FIG. 13 includes an output buffer unit 12B instead of the output buffer unit 12A.
- the difference is that a clock transmission unit 14B is provided instead of the clock transmission unit 14A.
- the clock transmission unit 14B includes a PLL 15, a counter 16, and a clock selection unit 18.
- the clock transmission unit 14B can generate a clock clock2 that is intermittently phase-shifted based on the input clock clock1, and can transmit the clock clock2. .
- the PLL 15 receives the clock clock1 output from the transmission data generation unit 11, generates a multiphase clock clock3 having a frequency obtained by multiplying the frequency of the input clock clock1 by a certain value, and outputs the multiphase clock clock3.
- the counter 16 inputs any one of the multiphase clocks clock3 output from the PLL 15, counts the pulses of the input clocks, and outputs a clock selection control signal for every fixed number of pulses.
- the clock selection unit 18 receives the multiphase clock clock3 output from the PLL 15, and also receives the clock selection control signal output from the counter 15, and any one of the multiphase clock clock3 is instructed by the clock selection control signal. Is selected and output as the clock clock2.
- the data transmission unit 13 transmits data data2 in synchronization with the clock clock2 output from the clock selection unit 18 of the clock transmission unit 14B.
- the clock to be selected from among the multiphase clocks is switched to generate and send out a clock given a phase shift. Since the clock clock2 having the spectrum can be output, the peak intensity of the spectrum can be further reduced, and the EMI noise can be further reduced.
- the data transmitted to the receiving device can be received by the receiving device without omission.
- data loss may be allowed in actual applications.
- the blanking period data in the video signal may be lost.
- this blanking period occurs at a constant cycle.
- the clock transmission unit may not include a PLL.
- the transmitting apparatus 10C according to the third embodiment intermittently applies a phase shift to a clock using a blanking indicator signal indicating a blanking period.
- FIG. 14 is a diagram illustrating a configuration of a transmission device 10C according to the third embodiment.
- a transmission device 10C according to the third embodiment includes a transmission data generation unit 11 and an output buffer unit 12C.
- the transmission data generation unit 11 generates data data1 and a clock clock1 to be sent to the receiving device, and outputs them to the output buffer unit 12C.
- the output buffer unit 12C includes a data transmission unit 13 and a clock transmission unit 14C.
- the transmission device 10C of the third embodiment shown in FIG. 14 includes an output buffer unit 12C instead of the output buffer unit 12A.
- the difference is that a clock transmission unit 14C is provided instead of the clock transmission unit 14A.
- the clock transmission unit 14C includes a counter 16 and a clock inversion unit 17, and can generate a clock clock2 that is intermittently phase-shifted based on the input clock clock1 and transmit the clock clock2.
- the counter 16 inputs a blanking indicator signal indicating a blanking period in the video signal data data1, counts an event where the blanking indicator signal becomes a significant value, and is significant only for a certain period for each certain count value.
- a clock inversion control signal that is a value is output.
- the clock inversion unit 17 receives the clock clock1 output from the transmission data generation unit 11, and also receives the clock inversion control signal output from the counter 15, and every time the clock inversion control signal becomes a significant value, the clock clock1 Switch between normal phase and reverse phase and output as clock clock2.
- the data transmitting unit 13 transmits data data2 in synchronization with the clock clock2 output from the clock inverting unit 17 of the clock transmitting unit 14C.
- FIG. 15 is a timing chart of clocks clock1 and clock2 in the transmission device 10C of the third embodiment.
- a clock clock1 a signal obtained by inverting the clock clock1, a blanking indicator signal, and a clock clock2 output from the clock inverting unit 17 are shown in order from the top. Yes.
- the clock inverting unit 17 switches between the normal phase and the reverse phase of the clock clock1 and outputs it as the clock clock2 by the blanking indicator signal indicating the blanking period. Since the pulse # 10 is missing in the output clock clock2, the data synchronized with this pulse etch is also missing. However, since this missing timing is a blanking period, there is no influence on the video data.
- phase shift may be performed every time there is a blanking indicator signal, and in this case, the counter 16 is unnecessary. However, when the phase shift is performed at a rate of once every several times in the blanking indicator signal, the counter 16 may be provided as shown in the figure. Further, instead of the blanking indicator signal, another specific signal indicating a timing at which data loss can be permitted may be used.
- the delay time difference between the data from the transmission device to the reception device and the clock is not a problem.
- the data signal line and the clock signal line from the transmission device 10 to the reception device 30 are not necessarily equal in length, and FIG. ),
- the clock signal line may be longer than the data signal line.
- a buffer may be inserted in the middle of the clock signal line.
- the number of buffers inserted in the middle of the clock signal line from the transmission device to each reception device may be different. In these cases, there is a delay time difference between the data from the transmitting device to the receiving device and the clock.
- the delay time difference compensation may be performed on the transmission device side, the reception device side, or may be performed by another device inserted for compensation.
- FIG. 17 is a diagram for explaining a delay time difference when SS application is not performed.
- the clock clock shown in FIG. 4A has a constant period.
- the clock clock2 shown in FIG. 4B has a slight delay time difference with respect to the clock clock shown in FIG.
- the clock clock2 shown in FIG. 4C has a delay time difference of one cycle with respect to the clock clock2 shown in FIG. In any case, since the delay time difference is constant in time, once the delay time difference is compensated, the effect is maintained thereafter.
- FIG. 18 is a diagram for explaining the delay time difference when the SS application of the comparative example is performed.
- the clock clock2 shown in FIG. 4B has a slight delay time difference with respect to the clock clock shown in FIG.
- the clock clock2 shown in FIG. 3C has a delay time difference of one cycle with respect to the clock clock2 shown in FIG.
- the clock clock2 shown in FIG. 3D further has a delay time difference of one cycle with respect to the clock clock2 shown in FIG.
- the delay time difference is equal to or less than one cycle as in the case of FIG. 5B, the delay time difference is constant in time. Therefore, once the delay time difference is compensated, the effect is maintained thereafter. However, if the delay time difference is equal to or greater than one cycle as in the case of FIG. 3C, the delay time difference fluctuates with time, so even if the delay time difference is compensated at some point, the effect is maintained. And always compensate for the delay difference. If the delay time difference further increases as in the case of FIG. 4D, the delay time difference fluctuates and adjustment becomes more difficult.
- FIG. 19 is a diagram illustrating a configuration of a transmission device 10D according to the fourth embodiment.
- FIG. 20 is a timing chart of each data in the transmission device 10D of the fourth embodiment.
- the transmission device 10D of the fourth embodiment includes a transmission data generation unit 21, a notification command generation unit 22, and a parallel-serial conversion unit 23.
- the transmission data generation unit 21 generates data data1 and clock clock1 to be sent to the receiving device, and outputs them to the notification command generation unit 22.
- the transmission data generation unit 21 intermittently inserts dummy data (dummy data) in the middle of data (Normal data) that should be transmitted to the receiving device.
- the dummy data to be inserted is inserted at a timing for giving a phase shift to the clock, and occupies at least two units of the minimum decoding unit of transmission data.
- the notification command generation unit 22 receives the data data1 output from the transmission data generation unit 21, detects dummy data in the data data1, and replaces the first unit of the dummy data with a phase shift notification command. .
- the data after the second unit of the dummy data may be sent to the receiving device as it is if there is no problem even if it is sent to the receiving device. However, when a problem occurs on the receiving apparatus side when the data after the second unit of the dummy data is sent to the receiving apparatus as it is, the notification command generation unit 22 does not generate the defect on the dummy data. Replace with other dummy data (dummy data2).
- the notification command generation unit 22 outputs the data data2 after such replacement to the parallel-serial conversion unit 23.
- the notification command generator 22 generates a parallel phase shift start signal (phase shift start signal) for instructing the clock to be phase shifted at the timing of the dummy data (dummy data or dummy data2) in the data data2. -Output to serial converter 23.
- the parallel-serial converter 23 receives the data data2 output from the notification command generator 22 and the phase shift start signal. Then, the parallel-serial conversion unit 23, as in the output buffers 14A to 14C in the first to third embodiments, uses the clock (serial clock0) given the phase shift at the timing indicated by the phase shift start signal. At the same time, serial data (serial data0) converted from data data2 is sent in synchronization with the clock.
- the serial data (serial data0) includes a phase shift notification command for notifying the timing at which the phase shift is given to the clock (serial clock0), and following this phase shift notification command, dummy data (dummy data or dummy data2) is included.
- FIG. 21 is a diagram illustrating a configuration of the receiving device 30 according to the fourth embodiment.
- FIG. 22 is a timing chart of each data in the receiving device 30 according to the fourth embodiment.
- the receiving device 30 according to the fourth embodiment includes a serial-parallel conversion unit 31 and a data processing unit 32.
- the data processing unit 32 includes a notification command detection unit 33, a data replacement unit 34, and a decoding unit 35.
- the serial-parallel converter 31 receives serial data (serial data0) and a clock (serial clock0) sent from the transmission device 10D in synchronization with each other.
- the serial-parallel conversion unit 31 includes a clock receiving unit that receives a clock (serial0clock0) and a data receiving unit that samples and receives serial data (serial data0) in synchronization with the clock.
- the serial-parallel converter 31 outputs the parallel data data1 converted from the serial data (serial data0) to the notification command detector 33.
- the notification command detection unit 33 receives the data data1 output from the serial-parallel conversion unit 31, and detects a phase shift notification command in the data data1. When the notification command detection unit 33 detects the phase shift notification command, the notification command detection unit 33 outputs a notification command detection signal indicating that to the data replacement unit 34. Further, the notification command detection unit 33 outputs the input data data1 as data dagta2 to the data replacement unit 34.
- the data replacement unit 34 inputs the data dagta2 and the notification command detection signal output from the notification command detection unit 33. Based on the notification command detection signal, the data replacement unit 34 recognizes that the data following the phase shift notification command in the data dagta2 is dummy data, that is, invalid data (Invalidvaldata). Then, the data replacement unit 34 outputs the Valid signal to the decoding unit 35 as a low level during the period of the phase shift notification command and invalid data (Invalid data) which are originally unnecessary. The Valid signal supplied from the data replacement unit 34 to the decoding unit 35 becomes high level when the data data3 supplied from the data replacement unit 34 to the decoding unit 35 is the original data (Normal Data), and the data data3 is invalid data. At some point, it goes low.
- the data replacement unit 34 replaces the data data3 after the replacement with a value that does not cause inconvenience (for example, 0).
- the data is output to the decoding unit 35.
- the decoding unit 35 receives the data data3 and the Valid signal output from the data replacement unit 34, performs necessary processing based on these, and outputs the data data4 to the subsequent stage. As described above, when the received data is a phase shift notification command, the data processing unit 32 including the notification command detection unit 33, the data replacement unit 34, and the decoding unit 35 is notified at the timing notified by the phase shift notification command. Data reception can be disabled.
- FIG. 23 is a timing chart of data and clocks in a transmission / reception system including the transmission device 10D and the reception device 30 according to the fourth embodiment.
- the data data1 is synchronized with the clock clock1, and when the clock clock1 is phase-shifted, the data data1 is also phase-shifted by the same shift amount.
- a phase shift notification command for notifying the phase shift timing is sent from the transmission device 10D to the reception device 30.
- the receiving device 30 when the received data is a phase shift notification command, the reception of data at the timing notified by the phase shift notification command is invalidated. At this time, if invalid data is set as dummy data, data transmission from the transmission device 10D to the reception device 30 can be performed without any problem.
- FIG. FIG. 24 is a diagram illustrating a configuration example of the transmission / reception system 1 of the fourth embodiment.
- the transmission / reception system 1 shown in this figure includes a transmission device 10D and reception devices 30 1 to 30 6 .
- the transmitting apparatus 10D is substantially the same as the above-described transmitting apparatus 10D, but sends a common clock clock to the six receiving apparatuses 30 1 to 30 6 and sends data data1 to the receiving apparatus 30 1 .
- delivery, data data2 is sent to the receiving device 30 2, the data data3 sent to the receiving device 30 3, data data4 sent to the receiving device 30 4, the data to the receiving device 30 5 It sends a data5, sends data data6 to the receiving apparatus 30 6.
- Each of the receiving devices 30 1 to 30 6 is substantially the same as the receiving device 30 described above, but buffers the input clock clock and sends it to the receiving device at the next stage. That is, the reception device 30 1 receives the output data data1 and clock clock from the transmission apparatus 10D, and sends the clock clock which is the input to buffer the next stage of the receiving device 30 2.
- Receiving apparatus 30 2 inputs the data data2 output from the transmission unit 10D, input the clock clock output from the previous stage of the receiving device 30 1, the next stage of the clock clock which is the input to buffer and it sends to the receiving device 30 3.
- the receiving apparatus 30 3 inputs the data data3 output from the transmission unit 10D, input the clock clock output from the previous stage of the receiving device 30 2, the next stage of the clock clock which is the input to buffer and it sends to the receiving device 30 4.
- Receiving apparatus 30 4 inputs the data data4 output from the transmission unit 10D, input the clock clock output from the previous stage of the receiving apparatus 30 3, the next stage of the clock clock which is the input to buffer and it sends to the receiving device 30 5.
- Receiving device 30 5 inputs the data data5 outputted from the transmitting unit 10D, input the clock clock output from the previous stage of the receiving device 30 4, the next stage of the clock clock which is the input to buffer and it sends to the receiving device 30 6.
- the receiving apparatus 30 6 inputs the data data6 output from the transmission unit 10D, and inputs an output clock clock from the preceding receiving device 30 5.
- the delay time difference between the data input to each of the reception devices 30 1 to 30 6 and the clock is different. That is, the later the stage, the greater the delay time difference. Even when there is no delay time difference between the data data1 and clock clock to be input to the first stage of the receiving apparatus 30 1, between the data data2 and the clock clock input to the receiver 30 2 of the second stage there is a delay time difference, greater delay time difference between the third-stage data data3 clock clock that is input to the receiving device 30 3 is present.
- FIG. 25 is a timing chart of data and clocks in the transmission / reception system 1 of the fourth embodiment.
- transmitting apparatus 10D transmits 5-bit dummy data f to j following 5-bit phase shift notification commands a to e. It is assumed that a phase shift is caused in the portion of the phase shift notification command e.
- Each of the receiving devices 30 1 to 30 6 samples data at both the rising and falling timings of the clock.
- FIG. 4A shows the timing when no phase shift is performed and there is no delay time difference between the data and the clock.
- FIG (b) ⁇ (g) shows the case where the phase shift, the data and clock input to each receiving apparatus 30 n, as well as, data sampled by the receiving device 30 n, the timing.
- the receiving apparatus 30 first received data since the phase shift announcement command a ⁇ e, data f ⁇ j following this can be recognized as dummy data.
- the delay time difference between the clock half cycles (data 1 bit) between the data data2 and the clock clock input to the receiver 30 2 of the second stage occurs.
- the receiving device 30 2 since the first received data is a phase shift announcement command a ⁇ e, data f ⁇ j following this can be recognized as dummy data.
- the delay time difference between the clock one period (data 2 bits) between the data data3 and clock clock that is input to the receiving apparatus 30 of the third stage has occurred.
- the delay time difference between the clock 1.5 cycles (data 3 bits) between the data data4 clock clock input occurs in the receiving apparatus 30 4 of the fourth stage Yes.
- the delay time difference between the clock two cycles (data 4 bits) between the data data5 and the clock clock that is input to the receiving apparatus 30 6 in the fifth stage occurs.
- phase shift notification commands a to e are received by the receiving circuits 30 3 to 30 6 respectively.
- Any dummy data is missing instead of f to j.
- the configuration shown in FIGS. 24 and 25 is a timing controller in an image display device generally called a flat panel display such as a liquid crystal display (LCD) or a plasma display panel (PDP). It may be used for data transmission between the driver and the driver and data transmission in the memory system.
- a flat panel display such as a liquid crystal display (LCD) or a plasma display panel (PDP).
- LCD liquid crystal display
- PDP plasma display panel
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Abstract
Description
11 送信データ生成部
12,12A~12C 出力バッファ部
13 データ送信部
14,14A~14C クロック送信部
15 PLL
16 カウンタ
17 クロック反転部
18 クロック選択部
21 送信データ生成部
22 告知コマンド生成部
23 パラレル-シリアル変換部
30 受信装置
31 シリアル-パラレル変換部
32 データ処理部
33 告知コマンド検出部
34 データ入替部
35 デコード部
Claims (8)
- 間欠的に位相シフトを与えられたクロックを生成して送出するクロック送信部と、
前記クロック送信部により送出されるクロックに同期してデータを送出するデータ送信部と、
を備えることを特徴とする送信装置。 - 前記クロック送信部が、多相クロックのうちから選択するクロックを切り替えることで、位相シフトを与えられたクロックを生成して送出する、ことを特徴とする請求項1に記載の送信装置。
- 前記クロック送信部が、データ送信部から送出されるデータのうち特定データの送出のタイミングでクロックに位相シフトを与えて送出する、ことを特徴とする請求項1に記載の送信装置。
- 前記データ送信部が、前記クロック送信部から送出されるクロックに位相シフトが与えられる際に当該位相シフトタイミングを告知する位相シフト告知コマンドを送出する、ことを特徴とする請求項1に記載の送信装置。
- 前記データ送信部が、前記クロック送信部から送出されるクロックに位相シフトが与えられる時の直前に前記位相シフト告知コマンドを送出する、ことを特徴とする請求項4に記載の送信装置。
- 前記データ送信部が、前記位相シフト告知コマンドに続いてダミーデータを送出する、ことを特徴とする請求項4または5に記載の送信装置。
- 送信装置から互いに同期して送出されるクロックおよびデータを受信する受信装置であって、
クロックを受信するクロック受信部と、
前記クロック受信部により受信されるクロックに同期してデータをサンプリングして受信するデータ受信部と、
前記データ受信部により受信されたデータが、前記クロック受信部により受信されるクロックおよび前記データ受信部により受信されるデータそれぞれにおいて位相シフトが生じるタイミングを告知する位相シフト告知コマンドであるときに、その位相シフト告知コマンドが告知するタイミングでの前記データ受信部によるデータ受信を無効とするデータ処理部と、
を備えることを特徴とする受信装置。 - 請求項4~6の何れか1項に記載の送信装置と請求項7に記載の受信装置とを備え、
前記受信装置の前記クロック受信部が、前記送信装置の前記クロック送信部により送出されたクロックを受信し、
前記受信装置の前記データ受信部が、前記送信装置の前記データ送信部により送出されたデータを受信し、
前記受信装置の前記データ処理部が、前記送信装置の前記データ送信部により送出されて前記受信装置の前記データ受信部により受信されたデータが前記位相シフト告知コマンドであるときに、その位相シフト告知コマンドが告知するタイミングでの前記データ受信部によるデータ受信を無効とする、
ことを特徴とする送受信システム。
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EP11814362.7A EP2506433B1 (en) | 2010-08-03 | 2011-06-02 | Transmitting device, receiving device and transmitting/receiving system |
CN201180005194.9A CN102959862B (zh) | 2010-08-03 | 2011-06-02 | 发送装置、接收装置以及收发系统 |
US13/519,804 US9991912B2 (en) | 2010-08-03 | 2011-06-02 | Transmitting device, receiving device and transmitting/receiving system |
KR1020127011163A KR101443467B1 (ko) | 2010-08-03 | 2011-06-02 | 송신 장치, 수신 장치 및 송수신 시스템 |
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JP2010174404A JP5896503B2 (ja) | 2010-08-03 | 2010-08-03 | 送信装置、受信装置および送受信システム |
JP2010-174404 | 2010-08-03 |
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CN (1) | CN102959862B (ja) |
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US8825978B2 (en) * | 2012-06-04 | 2014-09-02 | Macronix International Co., Ltd. | Memory apparatus |
JP6190699B2 (ja) * | 2013-11-12 | 2017-08-30 | 株式会社メガチップス | Emi低減回路 |
WO2016185585A1 (ja) | 2015-05-20 | 2016-11-24 | 堺ディスプレイプロダクト株式会社 | 電気回路及び表示装置 |
CN106341219B (zh) * | 2015-12-24 | 2019-06-11 | 深圳开阳电子股份有限公司 | 一种基于扩频技术的数据同步传输装置 |
WO2017210846A1 (zh) * | 2016-06-06 | 2017-12-14 | 华为技术有限公司 | 抑制微波芯片中本振泄露的方法及其装置 |
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JP2012039173A (ja) | 2012-02-23 |
US20120321002A1 (en) | 2012-12-20 |
EP2506433A1 (en) | 2012-10-03 |
EP2506433A4 (en) | 2017-08-09 |
KR20120083548A (ko) | 2012-07-25 |
CN102959862A (zh) | 2013-03-06 |
TWI554039B (zh) | 2016-10-11 |
KR101443467B1 (ko) | 2014-09-22 |
JP5896503B2 (ja) | 2016-03-30 |
CN102959862B (zh) | 2016-05-18 |
EP2506433B1 (en) | 2019-08-07 |
US9991912B2 (en) | 2018-06-05 |
TW201208260A (en) | 2012-02-16 |
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