WO2016059957A1 - 送信装置および通信システム - Google Patents
送信装置および通信システム Download PDFInfo
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- WO2016059957A1 WO2016059957A1 PCT/JP2015/077071 JP2015077071W WO2016059957A1 WO 2016059957 A1 WO2016059957 A1 WO 2016059957A1 JP 2015077071 W JP2015077071 W JP 2015077071W WO 2016059957 A1 WO2016059957 A1 WO 2016059957A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
- H03K19/018557—Coupling arrangements; Impedance matching circuits
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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
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/493—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems by transition coding, i.e. the time-position or direction of a transition being encoded before transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/028—Arrangements specific to the transmitter end
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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
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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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
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
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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
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
- H04L25/4923—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using ternary codes
Definitions
- the present disclosure relates to a transmission apparatus that transmits a signal, and a communication system including such a transmission apparatus.
- Patent Document 1 discloses a noise cancellation circuit that suppresses power supply noise generated in a differential output buffer.
- the first transmission device includes three first driver units, three first pre-driver units, a second pre-driver unit, and a control unit.
- the three first pre-driver units are provided corresponding to the three first driver units, respectively, each of which includes a predetermined number of signals and corresponding to the first control signals based on three different first control signals.
- Each driver unit is driven.
- the second pre-driver unit operates based on a second control signal including a predetermined number of signals.
- the control unit is included in the second control signal so that the number of transition signals among the plurality of signals included in the three first control signals and the second control signal is the same between the transition timings. The transition of a predetermined number of signals is controlled.
- the second transmission device includes a plurality of first driver units, a plurality of first predriver units, a second predriver unit, and a control unit.
- the plurality of first pre-driver units are provided corresponding to the plurality of first driver units, respectively, each of which includes a predetermined number of signals and corresponding to the first pre-driver units based on a plurality of different first control signals.
- Each driver unit is driven.
- the second pre-driver unit operates based on a second control signal including a predetermined number of signals.
- the control unit is included in the second control signal so that the number of transition signals among the plurality of signals included in the plurality of first control signals and the second control signal is the same between the transition timings. The transition of a predetermined number of signals is controlled.
- the communication system includes a transmission device and a reception device.
- the transmission apparatus includes three first driver units, three first pre-driver units, a second pre-driver unit, and a control unit.
- the three first pre-driver units are provided corresponding to the three first driver units, respectively, each of which includes a predetermined number of signals and corresponding to the first control signals based on three different first control signals.
- Each driver unit is driven.
- the second pre-driver unit operates based on a second control signal including a predetermined number of signals.
- the control unit is included in the second control signal so that the number of transition signals among the plurality of signals included in the three first control signals and the second control signal is the same between the transition timings. The transition of a predetermined number of signals is controlled.
- first control signals and second control signals are generated, and three first control signals are generated based on the three first control signals.
- the second pre-driver unit is controlled based on the second control signal.
- the transition of a predetermined number of signals included in the second control signal is determined by the number of transition signals among the plurality of signals included in the three first control signals and the second control signal being the transition timing. Controlled to be the same between.
- a plurality of first control signals and a second control signal are generated, and a plurality of first predrivers are generated based on the plurality of first control signals.
- Each of the units is controlled, and the second pre-driver unit is controlled based on the second control signal.
- the transition of the predetermined number of signals included in the second control signal is determined by the number of transition signals among the plurality of signals included in the plurality of first control signals and the second control signal being the transition timing. Controlled to be the same between.
- the number of transition signals among the plurality of signals included in the three first control signals and the second control signal is the transition. Since the transition of a predetermined number of signals included in the second control signal is controlled so as to be the same between timings, the communication performance can be improved.
- the number of signals that transition among the plurality of first control signals and the plurality of signals included in the second control signal is between the transition timings. Since the transition of a predetermined number of signals included in the second control signal is controlled so as to be the same, the communication performance can be improved.
- FIG. 1 is a block diagram illustrating a configuration example of a communication system according to an embodiment of the present disclosure. It is explanatory drawing showing the voltage state of the signal which the communication system shown in FIG. 1 transmits / receives. It is a block diagram showing the example of 1 structure of the transmitter which concerns on 1st Embodiment. It is explanatory drawing showing the transition of the symbol which the communication system shown in FIG. 1 transmits / receives.
- 4 is a table illustrating an operation example of the signal generation unit 11 illustrated in FIG. 3.
- FIG. 4 is a block diagram illustrating a configuration example of an output unit illustrated in FIG. 3.
- 4 is a table illustrating an operation example of the output unit illustrated in FIG. 3.
- FIG. 7 is a circuit diagram illustrating a configuration example of a transition control unit illustrated in FIG. 6. It is a table
- FIG. 2 is a block diagram illustrating a configuration example of a receiving device illustrated in FIG. 1.
- FIG. 11 is an explanatory diagram illustrating an example of a reception operation of the reception device illustrated in FIG. 10.
- FIG. 4 is a timing waveform diagram illustrating an operation example of the transmission apparatus illustrated in FIG. 3. 4 is a table illustrating an operation example of the transmission apparatus illustrated in FIG. 3.
- FIG. 10 is a timing waveform diagram illustrating an operation example of a transmission apparatus according to a comparative example.
- FIG. 18 is a block diagram illustrating a configuration example of a receiving device illustrated in FIG. 17.
- FIG. 18 is a block diagram illustrating a configuration example of a transmission device illustrated in FIG. 17.
- FIG. 20 is a block diagram illustrating a configuration example of an output unit illustrated in FIG. 19.
- FIG. 22 is a block diagram illustrating a configuration example of another communication system to which the transmission device illustrated in FIG. 21 is applied. It is a block diagram showing the example of 1 structure of the transmitter which concerns on 2nd Embodiment.
- FIG. 24 is a block diagram illustrating a configuration example of an output unit illustrated in FIG. 23.
- FIG. 25 is a circuit diagram illustrating a configuration example of a transition control unit illustrated in FIG. 24.
- FIG. 26 is a table illustrating an operation example of the transition control unit illustrated in FIG. 25.
- 1 is a perspective view illustrating an external configuration of a smartphone to which a communication system according to an embodiment is applied. It is a block diagram showing the example of 1 structure of the application processor to which the communication system which concerns on one Embodiment was applied. 1 is a block diagram illustrating a configuration example of an image sensor to which a communication system according to an embodiment is applied.
- FIG. 1 illustrates a configuration example of a communication system (communication system 1) to which the transmission device according to the first embodiment is applied.
- the communication system 1 performs communication using signals having three voltage levels.
- the communication system 1 includes a transmission device 10 and a reception device 40.
- the transmission device 10 transmits signals SIGA, SIGB, and SIGC to the reception device 40 via transmission lines 9A, 9B, and 9C, respectively.
- the characteristic impedance of the transmission lines 9A to 9C for transmitting these signals is 50 [ ⁇ ] in this example.
- Signals SIGA, SIGB, and SIGC each transition between three voltage levels (high level voltage VH, medium level voltage VM, and low level voltage VL).
- FIG. 2 shows voltage states of the signals SIGA, SIGB, and SIGC.
- the transmission apparatus 10 transmits six symbols “+ x”, “ ⁇ x”, “+ y”, “ ⁇ y”, “+ z”, and “ ⁇ z” using three signals SIGA, SIGB, and SIGC. For example, when transmitting the symbol “+ x”, the transmission apparatus 10 sets the signal SIGA to the high level voltage VH, the signal SIGB to the low level voltage VL, and the signal SIGC to the medium level voltage VM. When transmitting the symbol “ ⁇ x”, the transmitting apparatus 10 sets the signal SIGA to the low level voltage VL, the signal SIGB to the high level voltage VH, and the signal SIGC to the medium level voltage VM.
- the transmitting apparatus 10 sets the signal SIGA to the medium level voltage VM, the signal SIGB to the high level voltage VH, and the signal SIGC to the low level voltage VL.
- the transmitting apparatus 10 sets the signal SIGA to the medium level voltage VM, the signal SIGB to the low level voltage VL, and the signal SIGC to the high level voltage VH.
- the transmitting apparatus 10 sets the signal SIGA to the low level voltage VL, the signal SIGB to the medium level voltage VM, and the signal SIGC to the high level voltage VH.
- the transmission apparatus 10 sets the signal SIGA to the high level voltage VH, the signal SIGB to the medium level voltage VM, and the signal SIGC to the low level voltage VL.
- FIG. 3 shows a configuration example of the transmission device 10.
- the transmission device 10 includes a clock generation unit 19, a signal generation unit 11, a flip-flop (F / F) 12, and an output unit 20.
- Each of these blocks is supplied with a power supply voltage VDD1 except for driver units 26A to 26D described later, and operates based on the power supply voltage VDD1.
- the clock generation unit 19 generates a clock TxCK.
- the clock generation unit 19 is configured by, for example, a PLL (Phase Locked Loop), and generates a clock TxCK based on a reference clock (not shown) supplied from the outside of the transmission device 10, for example.
- the clock generator 19 supplies the clock TxCK to the signal generator 11, the flip-flop 12, and the output unit 20.
- the signal generator 11 obtains a symbol NS based on the symbol PS indicated by the signals S11 to S13, the signals TxF, TxR, TxP, and the clock TxCK, and outputs the symbol NS using the signals S1 to S3.
- the symbols NS and PS respectively represent one of six symbols “+ x”, “ ⁇ x”, “+ y”, “ ⁇ y”, “+ z”, and “ ⁇ z”. It is.
- Symbol PS is a previously transmitted symbol (previous symbol)
- symbol NS is a symbol to be transmitted next (next symbol).
- FIG. 4 shows the operation of the signal generator 11.
- FIG. 4 shows transitions between six symbols “+ x”, “ ⁇ x”, “+ y”, “ ⁇ y”, “+ z”, and “ ⁇ z”.
- the three-digit numerical value attached to each transition indicates the values of the signals TxF, TxR, and TxP in this order.
- the signal TxF (Flip) makes a symbol transition between “+ x” and “ ⁇ x”, makes a symbol transition between “+ y” and “ ⁇ y”, and makes “+ z” and “ ⁇ z”
- the symbol is transitioned between. Specifically, when the signal TxF is “1”, a transition is made to change the polarity of the symbol (for example, from “+ x” to “ ⁇ x”), and when the signal TxF is “0”. Does not perform such a transition.
- the signals TxR and TxP are between “+ x” and other than “ ⁇ x”, between “+ y” and other than “ ⁇ y”, “ The symbol is shifted between “+ z” and other than “ ⁇ z”.
- the signals TxR and TxP are “1” and “0”
- the signal transitions clockwise (for example, from “+ x” to “+ y”) in FIG. 4 while maintaining the polarity of the symbol.
- the signals TxR and TxP are “1” and “1”
- the polarity of the symbol is changed and the signal transitions clockwise (for example, from “+ x” to “ ⁇ y”) in FIG.
- the signal TxR and TxP transitions counterclockwise (for example, from “+ x” to “+ z”) in FIG. 4 while maintaining the polarity of the symbol.
- TxP is “0”, “1”, the polarity of the symbol is changed, and transition is made counterclockwise in FIG. 4 (for example, from “+ x” to “ ⁇ z”).
- the direction of symbol transition is specified by the signals TxF, TxR, and TxP.
- the signal generation unit 11 obtains the symbol NS based on the symbol PS indicated by the signals S11 to S13, the signals TxF, TxR, TxP, and the clock TxCK, and outputs the symbol NS using the signals S1 to S3.
- the symbol NS is associated with signals S1 to S3
- the symbol PS is associated with signals S11 to S13.
- the signal generator 11 supplies the symbol NS to the flip-flop 12 and the output unit 20 using the signals S1 to S3.
- the flip-flop 12 delays the signals S1, S2, and S3 by one clock TxCK and outputs them as signals S11, S12, and S13. That is, the flip-flop 12 generates the symbol PS by delaying the symbol NS indicated by the signals S1, S2, and S3 by one clock of the clock TxCK.
- the flip-flop 12 supplies the signals S11, S12, and S13 to the signal generator 11.
- the output unit 20 generates signals SIGA, SIGB, and SIGC based on the signals S1 to S3, and outputs them from the output terminals ToutA, ToutB, and ToutC, respectively.
- FIG. 6 shows a configuration example of the output unit 20.
- the output unit 20 includes flip-flops 21 to 23, an output control unit 24, pre-driver units 25A, 25B, 25C, and 25D, driver units 26A, 26B, 26C, and 26D, and a transition control unit 30. Yes.
- the flip-flop 21 samples the signal S1 based on the clock TxCK and outputs the sampling result as the signal S21.
- the flip-flop 22 samples the signal S2 based on the clock TxCK and outputs the sampling result as the signal S22.
- the flip-flop 23 samples the signal S3 based on the clock TxCK and outputs the sampling result as the signal S23.
- the output control unit 24 generates six signals PUA, PDA, PUB, PDB, PUC, and PDC based on the signals S21, S22, and S23 and the clock TxCK.
- the output control unit 24 supplies the signals PUA and PDA to the pre-driver 25A, supplies the signals PUB and PDB to the pre-driver 25B, and supplies the signals PUC and PDC to the pre-driver 25C.
- the pre-driver unit 25A drives the driver unit 26A based on the signals PUA and PDA, and the pre-driver unit 25B drives the driver unit 26B based on the signals PUB and PDB.
- the pre-driver unit 25C Is for driving the driver unit 26C based on the signals PUC and PDC.
- the pre-driver unit 25A has pre-drivers 251 and 252.
- the pre-driver 251 drives a transistor MU (described later) of the driver unit 26A based on the signal PUA, and the pre-driver 252 drives a transistor MD (described later) of the driver unit 26A based on the signal PDA. is there.
- the output signals of the pre-drivers 251 and 252 transition between the power supply voltage VDD1 and the ground voltage. The same applies to the pre-driver units 25B and 25C.
- the driver unit 26A generates a signal SIGA
- the driver unit 26B generates a signal SIGB
- the driver unit 26C generates a signal SIGC.
- the driver unit 26A includes transistors MU and MD and a resistance element RO.
- the transistors MU and MD are N-channel MOS (Metal Oxide Semiconductor) type FETs (Field Effect Transistors).
- the power supply voltage VDD2 is supplied to the drain of the transistor MU, the output signal of the predriver 251 of the predriver unit 25A is supplied to the gate, and the source is connected to the drain of the transistor MD and one end of the resistance element RO.
- the drain of the transistor MD is connected to the source of the transistor MU and one end of the resistance element RO, the output signal of the pre-driver 252 of the pre-driver unit 25A is supplied to the gate, and the source is grounded.
- the resistance element RO functions as a termination resistance, and is 50 [ ⁇ ] in this example.
- One end of the resistance element RO is connected to the source of the transistor MU and the drain of the transistor MD, and the other end is connected to the output terminal ToutA.
- the output unit 20 converts the voltages of the output terminals ToutA to ToutC based on the signals S1 to S3 into three different voltages (a high level voltage VH, an intermediate level voltage VM, And the low level voltage VL).
- FIG. 7 shows an operation example of the output unit 20.
- the signals S21, S22, and S23 become “100” similarly to the signals S1, S2, and S3 (FIG. 5).
- the output control unit 24 sets the signals PUA, PDA, PUB, PDB, PUC, and PDC to “100100” based on the signals S21, S22, and S23.
- the driver unit 26A the transistor MU is turned on and the transistor MD is turned off, so that the voltage (signal SIGA) of the output terminal ToutA is set to the high level voltage VH.
- the driver unit 26B since the transistor MU is turned off and the transistor MD is turned on, the voltage (signal SIGB) of the output terminal ToutB is set to the low level voltage VL.
- the driver unit 26C since both the transistors MU and MD are turned off, the voltage (signal SIGC) at the output terminal ToutC is set to the medium level voltage VM by resistance elements 41B and 41C of the receiving device 40 described later. It is like that.
- the transition control unit 30 (FIG. 6) generates two signals PUD and PDD based on the signals S1, S2, S3, the signals S21, S22, S23 and the clock TxCK. Specifically, as will be described later, the transition control unit 30 causes the signals PUD and PDD to transition based on the transition of the signals S21 to S23.
- FIG. 8 shows a configuration example of the transition control unit 30.
- the transition control unit 30 includes exclusive OR circuits 31 to 33, AND circuits 34A to 36, an OR circuit 37, a flip-flop 38, and a selector 39.
- the exclusive OR circuit 31 calculates an exclusive OR of the signal S1 and the signal S21.
- the circuit composed of the exclusive OR circuit 31 and the flip-flop 21 functions as a circuit that detects a transition in the signal S21.
- the exclusive OR circuit 32 calculates an exclusive OR of the signal S2 and the signal S22.
- the circuit composed of the exclusive OR circuit 32 and the flip-flop 22 functions as a circuit that detects a transition in the signal S22.
- the exclusive OR circuit 33 calculates an exclusive OR of the signal S3 and the signal S23.
- a circuit composed of the exclusive OR circuit 33 and the flip-flop 23 functions as a circuit for detecting a transition in the signal S23.
- the logical product circuit 34 obtains a logical product of the output signal of the exclusive OR circuit 31 and the output signal of the exclusive OR circuit 32.
- the logical product circuit 35 obtains a logical product of the output signal of the exclusive OR circuit 32 and the output signal of the exclusive OR circuit 33.
- the logical product circuit 36 obtains a logical product of the output signal of the exclusive OR circuit 33 and the output signal of the exclusive OR circuit 31.
- the logical sum circuit 37 calculates the logical sum of the output signals of the logical product circuits 34 to 36 and outputs the result as a signal SEL. That is, the AND circuit 34 to 36 and the OR circuit 37 set the signal SEL to “1” when two or more of the three output signals of the exclusive OR circuits 31 to 33 indicate “1”, In other cases, the signal SEL is set to “0”.
- the flip-flop 38 samples the output signal of the selector 39 based on the clock TxCK, outputs the sampling result as the signal PUD, and outputs the inverted logic of the sampling result as the signal PDD.
- the selector 39 selects and outputs one of the two signals PUD and PDD based on the signal SEL. Specifically, the selector 39 selects and outputs the signal PUD when the signal SEL indicates “1”, and selects and outputs the signal PDD when the signal SEL indicates “0”. It has become.
- the circuit including the flip-flop 38 and the selector 39 maintains the logic levels of the signals PUD and PDD when the signal SEL is “1”, and the signals PUD and PDD when the signal SEL is “0”. Each logic level is inverted.
- the pre-driver unit 25D drives the driver unit 26D based on the signals PUD and PDD.
- the predriver unit 25D has the same configuration as the predriver units 25A to 25C.
- the driver unit 26D is a so-called dummy driver that functions as a load of the pre-driver unit 25D.
- the driver unit 26D includes transistors MU and MD. That is, the driver unit 26D is obtained by omitting the resistance element RO from the driver units 26A to 26C, and does not output a signal.
- FIG. 9 shows an operation example of the transition control unit 30.
- “ ⁇ ” indicates that the signal transitions
- a blank indicates that the signal does not transition.
- the signal SEL becomes “1”, and the signals PUD and PDD do not transit. In other cases, the signal SEL becomes “0”, and the signals PUD and PDD transition.
- the transition control unit 30 causes the signals PUD and PDD to transition based on the transitions of the signals S21 to S23. Thereby, in the output unit 20, as will be described later, the transition signal of the eight signals PUA, PDA, PUB, PDB, PUC, PDC, PUD, PDD input to the four pre-driver units 25A to 25D is changed. The number is made to match between the transition timings.
- FIG. 10 shows a configuration example of the receiving device 40.
- the receiving device 40 includes resistance elements 41A, 41B, and 41C, amplifiers 42A, 42B, and 42C, a clock generation unit 43, flip-flops 44 and 45, and a signal generation unit 46.
- the resistance elements 41A, 41B, and 41C function as termination resistors in the communication system 1.
- One end of the resistance element 41A is connected to the input terminal TinA and the signal SIGA is supplied, and the other end is connected to the other ends of the resistance elements 41B and 41C.
- One end of the resistance element 41B is connected to the input terminal TinB and the signal SIGB is supplied, and the other end is connected to the other ends of the resistance elements 41A and 41C.
- One end of the resistance element 41C is connected to the input terminal TinC and the signal SIGC is supplied, and the other end is connected to the other ends of the resistance elements 41A and 41B.
- the amplifiers 42A, 42B, and 42C each output a signal corresponding to the difference between the signal at the positive input terminal and the signal at the negative input terminal.
- the positive input terminal of the amplifier 42A is connected to the negative input terminal of the amplifier 42C and one end of the resistance element 41A and the signal SIGA is supplied, and the negative input terminal is connected to the positive input terminal of the amplifier 42B and one end of the resistance element 41B.
- a signal SIGB is supplied.
- the positive input terminal of the amplifier 42B is connected to the negative input terminal of the amplifier 42A and one end of the resistance element 41B and the signal SIGB is supplied, and the negative input terminal is connected to the positive input terminal of the amplifier 42C and one end of the resistance element 41C.
- a signal SIGC is supplied.
- the positive input terminal of the amplifier 42C is connected to the negative input terminal of the amplifier 42B and one end of the resistance element 41C, and the signal SIGC is supplied, and the negative input terminal is connected to the positive input terminal of the amplifier 42A and the resistance element 41A. At the same time, the signal SIGA is supplied.
- the amplifier 42A outputs a signal corresponding to the difference (SIGA-SIGB) between the signal SIGA and the signal SIGB
- the amplifier 42B is a signal corresponding to the difference (SIGB-SIGC) between the signal SIGB and the signal SIGC
- the amplifier 42C outputs a signal corresponding to the difference (SIGC-SIGA) between the signal SIGC and the signal SIGA.
- FIG. 11 shows an operation example of the amplifiers 42A, 42B, and 42C.
- the signal SIGA is the high level voltage VH
- the signal SIGB is the low level voltage VL.
- the voltage of the signal SIGC is set to the middle level voltage VM by the resistance elements 41A, 41B, 41C.
- the current Iin flows in the order of the input terminal TinA, the resistance element 41A, the resistance element 41B, and the input terminal TinB. Since the high level voltage VH is supplied to the positive input terminal of the amplifier 42A and the low level voltage VL is supplied to the negative input terminal, and the difference becomes positive, the amplifier 42A outputs “1”.
- the low level voltage VL is supplied to the positive input terminal of the amplifier 42B, and the intermediate level voltage VM is supplied to the negative input terminal. Since the difference becomes negative, the amplifier 42B outputs “0”. Further, since the intermediate level voltage VM is supplied to the positive input terminal of the amplifier 42C and the high level voltage VH is supplied to the negative input terminal, and the difference becomes negative, the amplifier 42C outputs “0”. It has become.
- the clock generation unit 43 generates the clock RxCK based on the output signals of the amplifiers 42A, 42B, and 42C.
- the flip-flop 44 delays the output signals of the amplifiers 42A, 42B, and 42C by one clock RxCK and outputs the delayed signals. That is, the output signal of the flip-flop 34 indicates the symbol NS2.
- the symbol NS2 is one of six symbols “+ x”, “ ⁇ x”, “+ y”, “ ⁇ y”, “+ z”, and “ ⁇ z”, similarly to the symbols PS and NS. It shows one.
- the flip-flop 45 delays the three output signals of the flip-flop 44 by one clock RxCK and outputs them. That is, the flip-flop 45 generates the symbol PS2 by delaying the symbol NS2 by one clock of the clock RxCK.
- This symbol PS2 is a previously received symbol and, like the symbol NS2, of the six symbols “+ x”, “ ⁇ x”, “+ y”, “ ⁇ y”, “+ z”, and “ ⁇ z”. One of these is shown.
- the signal generator 46 generates signals RxF, RxR, and RxP based on the output signals of the flip-flops 44 and 45 and the clock RxCK. These signals RxF, RxR, and RxP correspond to the signals TxF, TxR, and TxP in the transmission apparatus 10, respectively, and represent symbol transitions. Based on the symbol CS2 indicated by the output signal of the flip-flop 44 and the previous symbol PS2 indicated by the output signal of the flip-flop 45, the signal generation unit 46 identifies symbol transitions (FIG. 4), and signals RxF, RxR, RxP is generated.
- the output control unit 24 corresponds to a specific example of “first control unit” in the present disclosure.
- the transition control unit 30 corresponds to a specific example of “second control unit” in the present disclosure.
- the pre-driver units 25A to 25C correspond to a specific example of “first pre-driver unit” in the present disclosure.
- the pre-driver unit 25D corresponds to a specific example of “second pre-driver unit” in the present disclosure.
- the driver units 26A to 26C correspond to a specific example of “first driver unit” in the present disclosure.
- the pre-driver 26D corresponds to a specific example of “third driver unit” in an embodiment of the present disclosure.
- the clock generation unit 19 generates a clock TxCK.
- the signal generation unit 11 obtains the next symbol NS based on the previous symbol PS and the signals TxF, TxR, TxP, and outputs the symbol NS using the signals S1 to S3.
- the flip-flop 12 delays the signals S1 to S3 (symbol NS) by one clock of the clock TxCK to generate signals S11 to S13 (symbol PS).
- the flip-flop 21 samples the signal S1 based on the clock TxCK and outputs the sampling result as the signal S21.
- the flip-flop 22 samples the signal S2 based on the clock TxCK. Then, the sampling result is output as the signal S22, and the flip-flop 23 samples the signal S3 based on the clock TxCK, and outputs the sampling result as the signal S23.
- the output control unit 24 generates six signals PUA, PDA, PUB, PDB, PUC, and PDC based on the signals S21 to S23 and the clock TxCK.
- the transition control unit 30 generates two signals PUD and PDD based on the signals S1 to S3, the signals S21 to S23, and the clock TxCK.
- the pre-driver unit 25A drives the driver unit 26A based on the signals PUA and PDA, and the driver unit 26A generates a signal SIGA.
- the pre-driver unit 25B drives the driver unit 26B based on the signals PUB and PDB, and the driver unit 26B generates a signal SIGB.
- the pre-driver unit 25C drives the driver unit 26C based on the signals PUC and PDC, and the driver unit 26C generates a signal SIGC.
- the pre-driver unit 25D drives the driver unit 26D based on the signals PUD and PDD.
- the amplifier 42A outputs a signal corresponding to the difference between the signal SIGA and the signal SIGB
- the amplifier 42B outputs a signal corresponding to the difference between the signal SIGB and the signal SIGC
- 42C outputs a signal corresponding to the difference between the signal SIGC and the signal SIGA.
- the clock generation unit 43 generates a clock RxCK based on output signals from the amplifiers 42A, 42B, and 42C.
- the flip-flop 44 delays the output signals of the amplifiers 42A, 42B, and 42C by one clock RxCK and outputs the delayed signals.
- the flip-flop 45 delays the three output signals of the flip-flop 44 by one clock RxCK and outputs the delayed signals.
- the signal generator 46 generates signals RxF, RxR, and RxP based on the output signals of the flip-flops 44 and 45 and the clock RxCK.
- the output unit 20 sets the voltages of the output terminals ToutA to ToutC to three different voltages (high level voltage VH, medium level voltage VM, and low level voltage VL) based on the signals S1 to S3, respectively.
- the detailed operation of the output unit 20 will be described below.
- FIG. 12 shows an example of the operation of the output unit 20.
- (A) to (C) show the waveforms of the signals SIGA to SIGC, and (D) to (K) show the signals PUA, PDA, PUB, The waveforms of PDB, PUC, PDC, PUD, and PDD are shown, respectively.
- (L) shows the waveforms of the power supply current Iac supplied to the four pre-drivers 25A, 25B, 25C, and 25D, and (M) shows the power supply voltage VDD1. Waveform is shown.
- the output unit 20 transmits symbols in the order of “+ x”, “ ⁇ y”, “ ⁇ z”,.
- the output control unit 24 sets the signals PUA, PDA, PUB, PDB, PUC, and PDC to “1” or “0” as shown in FIG. ) To (I)).
- the pre-driver 25A drives the driver unit 26A based on the signals PUA and PDA, and the driver unit 26A generates a signal SIGA (FIG. 12A).
- the pre-driver 25B drives the driver unit 26B based on the signals PUB and PDB, the driver unit 26B generates a signal SIGB (FIG. 12B), and the pre-driver 25C is based on the signals PUC and PDC. Then, the driver unit 26C is driven, and the driver unit 26C generates a signal SIGC (FIG. 12C).
- the transition control unit 30 transitions the signals PUD and PDD based on the transitions of the signals S21 to S23, and the eight signals PUA, PDA, PUB, PDB, and the like that are input to the four predriver units 25A to 25D.
- the pre-driver 25D is controlled so that the number of transition signals among PUC, PDC, PUD, and PDD is matched between transition timings.
- FIG. 13 shows the number of transition signals N1 among the three signals S21 to S23 and the transition among the eight signals PUA, PDA, PUB, PDB, PUC, PDC, PUD, and PDD in each transition of symbols. This represents the number of signals N2.
- the transition control unit 30 causes the number N2 of transition signals among the eight signals PUA, PDA, PUB, PDB, PUC, PDC, PUD, and PDD to be “4” in each symbol transition.
- the pre-driver 25D is controlled.
- the transition control unit 30 changes the signals PUD and PDD.
- the output unit 20 at the timing t1 in FIG. 12, four signals PUA, PUC, PUD, and PDD among the eight signals PUA, PDA, PUB, PDB, PUC, PDC, PUD, and PDD transition ( FIG. 12 (D) to (K)).
- the transition control unit 30 maintains the signals PUD and PDD.
- four signals PUA, PDB, PUC, and PDC among the eight signals PUA, PDA, PUB, PDB, PUC, PDC, PUD, and PDD transition (FIGS. 12D to 12K).
- the number N2 of transition signals among the eight signals PUA, PDA, PUB, PDB, PUC, PDC, PUD, and PDD matches between the transition timings.
- the magnitudes of the power supply currents Iac supplied to the four pre-drivers 25A, 25B, 25C, and 25D are substantially the same at each transition timing. can do.
- the transmission apparatus 10 can suppress the fluctuation of the power supply voltage VDD1 (FIG. 12 (K)) and explain the waveforms of the output signals SIGA to SIGC of the transmission apparatus 10, as will be described below in comparison with the comparative example. Quality can be improved and the communication performance in the communication system 1 can be improved.
- the transmission apparatus 10R according to this comparative example includes an output unit 20R in which the transition control unit 30, the pre-driver 25D, and the driver unit 26D are omitted from the transmission unit 20 according to the present embodiment.
- Other configurations are the same as those of the present embodiment (FIG. 1).
- FIG. 14 shows an operation example of the output unit 20R, where (A) to (C) show the waveforms of the signals SIGA to SIGC, respectively, and (D) to (I) show the signals PUA, PDA, PUB, The waveforms of PDB, PUC, and PDC are shown, respectively, (J) shows the waveform of power supply current Iac supplied to the three pre-drivers 25A, 25B, and 25C, and (K) shows the waveform of power supply voltage VDD1.
- FIG. 15 shows the number N1 of signals that transition among the three signals S21 to S23 and the number N3 of signals that transition among the six signals PUA, PDA, PUB, PDB, PUC, and PDC in each symbol transition. It represents.
- the number N3 of the transition signals among the six signals PUA, PDA, PUB, PDB, PUC, and PDC varies depending on the transition timing. Specifically, as shown in FIG. 15, the number N3 becomes “2” or “4” depending on the transition.
- the magnitude of the power supply current Iac supplied to the three pre-drivers 25A, 25B, and 25C changes depending on the transition timing. That is, the magnitude of the power supply current Iac is small in the transition of the symbol whose number N3 is “2”, and the magnitude of the power supply current Iac is large in the transition of the symbol whose number N3 is “4”.
- the power supply current Iac increases at the timing of driving the transistors MU and MD of the driver units 26A to 26D. Since these transistors MU and MD are generally configured in a large size, the equivalent capacitance values of the transistors MU and MD when viewed from the gates of the transistors MU and MD are large. Therefore, the power supply voltage VDD1 is greatly shaken when the transistors MU and MD are driven. At that time, in the output unit 20R, the magnitude of the power supply current Iac changes depending on the transition timing, so that a low frequency component appears in the power supply voltage VDD1 (FIG. 14 (K)), and the fluctuation of the power supply voltage VDD1 further increases. There is a risk of becoming larger.
- the power supply voltage VDD1 is supplied to various circuits (the clock generation unit 19, the signal generation unit 11, the flip-flops 12, 21 to 23, and the output control unit 24) in the transmission device 10 in addition to the pre-drivers 25A to 25C. Therefore, when the fluctuation of the power supply voltage VDD1 is large in this way, for example, jitter occurs in the output signals SIGA to SIGC of the transmission device 10R, and the waveform quality of the signals SIGA to SIGC may be degraded. In this case, communication performance in the communication system may be degraded.
- the number N2 of transition signals among the eight signals PUA, PDA, PUB, PDB, PUC, PDC, PUD, and PDD is matched between the transition timings. did.
- the transmitter 10 can suppress the fluctuation of the power supply voltage VDD1, can improve the waveform quality of the output signals SIGA to SIGC, and can improve the communication performance in the communication system 1.
- the transmission apparatus 10 controls the operation of the pre-driver unit 25D based on the signals S1 to S3 and the signals S21 to S23, the timing design can be facilitated. That is, for example, when the number of transition signals among the six signals PUA, PDA, PUB, PDB, PUC, and PDC is directly detected, and the signals PUD and PDD are generated based on the detection results. Therefore, the transition timing of the signals PUD and PDD becomes later than the transition timing of the signals PUA, PDA, PUB, PDB, PUC, and PDC due to the delay of the circuit that generates the signals PUD and PDD. In this case, the magnitude of the power supply current Iac changes depending on the transition timing, and the fluctuation of the power supply voltage VDD1 may be increased.
- the operation of the pre-driver unit 25D is controlled based on the signals S1 to S3 and the signals S21 to S23. That is, as shown in FIG. 15, the number N1 of transition signals among the three signals S21 to S23 and the number N3 of transition signals among the six signals PUA, PDA, PUB, PDB, PUC, PDC.
- the number N1 is “1”
- the number N3 is “2”, so that the signals PUD and PDD are changed
- the number N1 is “2” or “ In the case of 3 ”
- the number N3 becomes“ 4 ”, so that the signals PUD and PDD are maintained.
- timing design can be made easy.
- the number N2 of transition signals among the eight signals PUA, PDA, PUB, PDB, PUC, PDC, PUD, and PDD is made to match between transition timings. Communication performance can be improved.
- the pre-driver 25D drives the driver unit 26D.
- the pre-driver 25D is not limited to this, and instead, for example, a capacitive element such as an output unit 20A shown in FIG. May be driven.
- the output unit 20 ⁇ / b> A has a load unit 27.
- the load unit 27 includes capacitive elements 271 and 272.
- the output signal of the pre-driver 251 of the pre-driver unit 25D is supplied to one end of the capacitive element 271 and the other end is grounded.
- the output signal of the pre-driver 252 of the pre-driver unit 25D is supplied to one end of the capacitive element 272, and the other end is grounded.
- the capacitance value of the capacitive element 271 is equivalent to the capacitance value of the equivalent capacitance of the transistor MU viewed from the gates of the transistors MU of the driver units 26A to 26C, and the capacitance value of the capacitive element 272 is the driver units 26A to 26C.
- This is a value equivalent to the capacitance value of the equivalent capacitance of the transistor MU viewed from the gate of the transistor MD. Even if comprised in this way, the effect similar to the case of the said embodiment can be acquired.
- the transition control unit 30 always operates, but the present invention is not limited to this, and may operate only when necessary.
- the communication system 1B according to the present modification will be described in detail.
- FIG. 17 illustrates a configuration example of the communication system 1B.
- the communication system 1B determines whether or not to operate the transition control unit 30 based on the result of transmitting and receiving a predetermined pattern for calibration.
- the communication system 1B includes a receiving device 40B and a transmitting device 10B.
- FIG. 18 shows a configuration example of the receiving device 40B.
- the receiving device 40B has a pattern detection unit 47B.
- the pattern detection unit 47B compares the pattern of the signal received by the receiving device 40B with a predetermined pattern for calibration, and supplies the comparison result as the signal DET to the transmitting device 10B.
- FIG. 19 illustrates a configuration example of the transmission device 10B.
- FIG. 20 illustrates a configuration example of the output unit 20B of the transmission device 10B.
- the output unit 20B has a transition control unit 30B.
- the transition control unit 30B has two operation modes M1 and M2.
- the transition control unit 30B operates in the operation mode M1 in the same manner as in the above embodiment.
- transition control unit 30B maintains signals PUD and PDD in operation mode M2.
- the transition control unit 30B selects one of the operation modes M1 and M2 based on the signal DET, and operates in the selected operation mode.
- the transmission device 10B transmits signals SIGA to SIGC having a predetermined pattern for calibration.
- the receiving device 40B receives the signals SIGA to SIGC, and the pattern detection unit 47B compares the received signal pattern with a predetermined pattern for calibration, and notifies the transmitting device 10B of the comparison result.
- the transition control unit 30B of the transmission device 10B selects one of the operation modes M1 and M2 based on the comparison result.
- the transition control unit 20B operates in the operation mode M1 when, for example, a communication error occurs in the calibration mode.
- the transition control unit 20B operates in the operation mode M2 when no communication error occurs in the calibration mode.
- the signals PUD and PDD do not transition, power consumption can be reduced.
- the transmission apparatus 10 performs communication using the three signals SIGA to SIGC, but the present invention is not limited to this.
- the transmitting apparatus 10C according to the present modification will be described in detail.
- FIG. 21 illustrates a configuration example of the communication system 1C using the transmission device 10C
- FIG. 22 illustrates a configuration example of the communication system 1D using the transmission device 10C
- the transmitting apparatus 10C has two operation modes N1 and N2.
- the transmission device 10C supplies signals SIG1A to SIG1C to the reception device 40C via the data lane DL1, and receives signals SIG2A to SIG2C via the data lane DL2.
- the signal SIG3A to SIG3C is supplied to the receiving device 40C via the data lane DL3.
- the transmission device 10C transmits signals using five sets of differential signals (channels CH1 to CH5) as illustrated in FIG.
- the transmission apparatus 10C transmits nine signals in the operation mode N1, and transmits ten signals in the operation mode N2.
- one pre-driver unit and driver unit are not used for transmission.
- the transmission device 10 ⁇ / b> C has one transition control unit 30.
- the transition control unit 30 controls the pre-driver unit that is not used for the above-described transmission, for example, based on the signals S1 to S3 and S21 to S23 related to the data lane DL1. Thereby, in the transmitting apparatus 10C, the fluctuation of the power supply voltage VDD1 can be suppressed as in the case of the above embodiment.
- the transition control unit 30 operates based on the signals S1 to S3 and S21 to S23 related to the data lane DL1, but is not limited thereto, and instead, for example, the data lane The operation may be performed based on signals S1 to S3 and S21 to S23 related to DL2, or may be operated based on signals S1 to S3 and S21 to S23 related to data lane DL3.
- the transmission device 50 is configured using a transition control unit that controls the operation of the pre-driver unit 25D based on the signals TxF and TxP.
- symbol is attached
- FIG. 23 shows a configuration example of the transmission device 50.
- the transmission device 50 includes an output unit 60.
- the output unit 60 generates and outputs signals SIGA to SIGC based on the signals S1 to S3, the signals TxF and TxP, and the clock TxCK.
- FIG. 24 illustrates a configuration example of the output unit 60.
- the output unit 60 includes an output control unit 24, a delay unit 61, a transition control unit 70, pre-drivers 25A to 25D, and a driver unit 26D.
- the output control unit 24 generates six signals PUA, PDA, PUB, PDB, PUC, and PDC based on the signals S1 to S3 and the clock TxCK, as in the case of the first embodiment. .
- the delay unit 61 delays the signals TxF and TxP by a predetermined amount and outputs them as signals TxF2 and TxP2.
- the delay amount in the delay unit 61 corresponds to the delay amount in the signal generation unit 11 that generates the signals S1 to S3 input to the output control unit 24 based on the signals TxF, TxR, and TxP.
- the transition control unit 70 generates two signals PUD and PDD based on the signals TxF2 and TxP2. Specifically, as will be described later, the transition control unit 70 causes the signals PUD and PDD to transition based on the signals TxF2 and TxP2.
- FIG. 25 shows a configuration example of the transition control unit 70.
- the transition control unit 70 includes an OR circuit 71, a flip-flop 38, and a selector 39.
- the OR circuit 71 calculates a logical sum of the signal TxF2 and the inverted signal of the signal TxP2, and outputs the result as a signal SEL.
- the transition control unit 30 FIG. 8 according to the first embodiment, when the signal SEL is “1”, the circuit composed of the flip-flop 38 and the selector 39 has the logic of the signals PUD and PDD. Each level is maintained, and when the signal SEL is “0”, the logic levels of the signals PUD and PDD are inverted.
- the output control unit 24 corresponds to a specific example of “first control unit” in the present disclosure.
- the transition control unit 70 corresponds to a specific example of “second control unit” in the present disclosure.
- FIG. 26 illustrates an operation example of the transition control unit 70.
- “ ⁇ ” indicates that the signal transitions, and a blank indicates that the signal does not transition.
- the signal TxF is “0” and the signal TxP is “1”
- the signal SEL becomes “0”
- the signals PUD and PDD transition.
- the signal SEL becomes “1”
- the signals PUD and PDD do not transition.
- a transition in which the signal TxF is “0” and the signal TxP is “1” is indicated by a broken line.
- the transition in which the signal TxF is “0” and the signal TxP is “1” is a transition between the symbol “+ x” and the symbol “ ⁇ y”, the symbol “+ x” and the symbol “ ⁇ ”.
- the transition control unit 70 transitions the signals PUD and PDD when such a symbol transition occurs.
- the number N2 of the transition signals among the eight signals PUA, PDA, PUB, PDB, PUC, PDC, PUD, and PDD can be set to “4”, and this number N2 is made to coincide between the transition timings. be able to.
- the transmission device 50 can suppress the fluctuation of the power supply voltage VDD1, can improve the waveform quality of the output signals SIGA to SIGC, and can improve the communication performance in the communication system 2.
- FIG. 27 shows an appearance of a smartphone 300 (multifunctional mobile phone) to which the communication system of the above-described embodiment and the like is applied.
- Various devices are mounted on the smartphone 300, and the communication system according to the above-described embodiment is applied to a communication system that exchanges data between these devices.
- FIG. 28 illustrates a configuration example of the application processor 310 used in the smartphone 300.
- the application processor 310 includes a CPU (Central Processing Unit) 311, a memory control unit 312, a power supply control unit 313, an external interface 314, a GPU (Graphics Processing Unit) 315, a media processing unit 316, and a display control unit 317. And an MIPI (Mobile Industry Processor Interface) interface 318.
- the CPU 311, the memory control unit 312, the power supply control unit 313, the external interface 314, the GPU 315, the media processing unit 316, and the display control unit 317 are connected to the system bus 319, and data is mutually transmitted via the system bus 319. Can be exchanged.
- the CPU 311 processes various information handled by the smartphone 300 according to a program.
- the memory control unit 312 controls the memory 501 used when the CPU 311 performs information processing.
- the power supply control unit 313 controls the power supply of the smartphone 300.
- the external interface 314 is an interface for communicating with an external device, and is connected to the wireless communication unit 502 and the image sensor 410 in this example.
- the wireless communication unit 502 wirelessly communicates with a mobile phone base station, and includes, for example, a baseband unit, an RF (Radio Frequency) front end unit, and the like.
- the image sensor 410 acquires an image and includes, for example, a CMOS sensor.
- the GPU 315 performs image processing.
- the media processing unit 316 processes information such as voice, characters, and graphics.
- the display control unit 317 controls the display 504 via the MIPI interface 318.
- the MIPI interface 318 transmits an image signal to the display 504.
- As the image signal for example, a signal in YUV format or RGB format can be used.
- FIG. 29 illustrates a configuration example of the image sensor 410.
- the image sensor 410 includes a sensor unit 411, an ISP (Image Signal Processor) 412, a JPEG (Joint Photographic Experts Group) encoder 413, a CPU 414, a RAM (Random Access Memory) 415, and a ROM (Read Only Memory) 416.
- Each of these blocks is connected to the system bus 420 in this example, and can exchange data with each other via the system bus 420.
- the sensor unit 411 acquires an image and is configured by, for example, a CMOS sensor.
- the ISP 412 performs predetermined processing on the image acquired by the sensor unit 411.
- the JPEG encoder 413 encodes an image processed by the ISP 412 to generate a JPEG format image.
- the CPU 414 controls each block of the image sensor 410 according to a program.
- the RAM 415 is a memory used when the CPU 414 performs information processing.
- the ROM 416 stores a program executed by the CPU 414.
- the power supply control unit 417 controls the power supply of the image sensor 410.
- the I 2 C interface 418 receives a control signal from the application processor 310.
- the image sensor 410 receives a clock signal in addition to a control signal from the application processor 310. Specifically, the image sensor 410 is configured to operate based on clock signals having various frequencies.
- the MIPI interface 419 transmits an image signal to the application processor 310.
- the image signal for example, a signal in YUV format or RGB format can be used.
- the communication system between the MIPI interface 419 and the application processor 310 for example, the communication system according to the above-described embodiment is applied.
- communication is performed using three signals SIGA, SIGB, and SIGC.
- the communication is not limited to this, and communication is performed using, for example, two signals. May be performed, and communication may be performed using four or more signals.
- the transistors MU and MD are both turned off.
- the present invention is not limited to this.
- both the transistors MU and MD may be turned on. Thereby, the Thevenin termination is realized, and the voltage of the output terminal can be set to the medium level voltage VM.
- a control unit that controls transition of the predetermined number of signals.
- the control unit A first control unit that generates the three first control signals based on a data signal;
- the transmission apparatus according to (1) further comprising: a second control unit that generates the second control signal based on a transition of the data signal.
- the data signal includes three signals, The number of transition signals among the three signals included in the data signal corresponds to the number of transition signals among the plurality of signals included in the three first control signals.
- the transmitting device according to 1.
- a data signal generation unit that generates a data signal indicating a sequence of the transmission symbols based on a transition signal indicating a transition between transmission symbols;
- the controller is A first control unit that generates the three first control signals based on the data signal;
- transition signal corresponds to the number of signals that transition among a plurality of signals included in the three first control signals.
- Each of the first control signals includes two signals;
- the transmission device according to any one of (1) to (5), wherein the second control signal includes two signals.
- control unit has the same number of transition signals among a plurality of signals included in the three first control signals and the second control signal between transition timings.
- the transmission apparatus according to any one of (1) to (8), wherein transition of the predetermined number of signals included in the second control signal is controlled.
- (10) further comprising a second driver unit;
- the second pre-driver unit drives the second driver unit,
- Each of the three first driver units is An output terminal; A first transistor having a gate, a drain led to a first power supply, and a source led to the output terminal; A second transistor having a gate, a drain led to the output terminal, and a source led to a second power source;
- Each of the three first pre-driver units is A first predriver for driving the gate of the first transistor in the first driver section corresponding to the first predriver section;
- the transmission device according to any one of (1) to (10), further including: a second predriver that drives a gate of the second transistor in the first driver unit corresponding to the first predriver unit.
- the third driver unit includes: A first transistor having a gate, a drain led to a first power source, and a source; A second transistor having a gate, a drain led to a source of the first transistor, and a source led to a second power source; The transmission device according to any one of (1) to (9), wherein the second pre-driver unit drives the third driver unit.
- a plurality of first driver units a plurality of first driver units; A plurality of first driver units provided corresponding to the plurality of first driver units, each of which includes a predetermined number of signals and drives the corresponding first driver unit based on a plurality of different first control signals.
- a first pre-driver section of A second pre-driver section that operates based on a second control signal including a predetermined number of signals; Included in the second control signal so that the number of transition signals among the plurality of signals included in the plurality of first control signals and the second control signal is the same between transition timings.
- a control unit that controls transition of the predetermined number of signals.
- a transmission device A receiver and The transmitter is Three first driver sections; 3 provided corresponding to each of the three first driver units, each of which includes a predetermined number of signals, and drives the corresponding first driver unit based on three different first control signals.
- a control unit that controls transition of the predetermined number of signals.
- the receiving device includes: A receiving unit for receiving signals transmitted from the three driver units; A detection unit that generates a detection signal indicating a communication state based on a signal received by the reception unit; The communication system according to (15), wherein the control unit controls transition of the predetermined number of signals included in the second control signal based on the detection signal.
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Abstract
Description
1.第1の実施の形態
2.第2の実施の形態
3.適用例
[構成例]
図1は、第1の実施の形態に係る送信装置が適用された通信システム(通信システム1)の一構成例を表すものである。通信システム1は、3つの電圧レベルを有する信号を用いて通信を行うものである。
続いて、本実施の形態の通信システム1の動作および作用について説明する。
まず、図1などを参照して、通信システム1の全体動作概要を説明する。送信装置10において、クロック生成部19は、クロックTxCKを生成する。信号生成部11は、前のシンボルPSおよび信号TxF,TxR,TxPに基づいて、次のシンボルNSを求め、信号S1~S3を用いてシンボルNSを出力する。フリップフロップ12は、信号S1~S3(シンボルNS)を、クロックTxCKの1クロック分遅延させ、信号S11~S13(シンボルPS)を生成する。
出力部20は、信号S1~S3に基づいて、出力端子ToutA~ToutCの電圧を、互いに異なる3つの電圧(高レベル電圧VH、中レベル電圧VM、および低レベル電圧VL)にそれぞれ設定する。以下に、この出力部20の詳細動作について説明する。
本比較例に係る送信装置10Rは、本実施の形態に係る送信部20から、遷移制御部30、プリドライバ25D、およびドライバ部26Dを省いた出力部20Rを有するものである。その他の構成は、本実施の形態(図1)と同様である。
以上のように本実施の形態では、8つの信号PUA,PDA,PUB,PDB,PUC,PDC,PUD,PDDのうちの遷移する信号の数N2が、遷移タイミング間で一致するようにしたので、通信性能を高めることができる。
上記実施の形態では、プリドライバ25Dはドライバ部26Dを駆動するようにしたが、これに限定されるものではなく、これに代えて、例えば、図16に示す出力部20Aのように、容量素子を駆動してもよい。出力部20Aは、負荷部27を有している。負荷部27は、容量素子271,272を有している。容量素子271の一端には、プリドライバ部25Dのプリドライバ251の出力信号が供給され、他端は接地されている。容量素子272の一端には、プリドライバ部25Dのプリドライバ252の出力信号が供給され、他端は接地されている。容量素子271の容量値は、ドライバ部26A~26CのトランジスタMUのゲートから見た、トランジスタMUの等価容量の容量値と同等の値であり、容量素子272の容量値は、ドライバ部26A~26CのトランジスタMDのゲートから見た、ランジスタMUの等価容量の容量値と同等の値である。このように構成しても、上記実施の形態の場合と同様の効果を得ることができる。
上記実施の形態では、遷移制御部30は常に動作するようにしたが、これに限定されるものではなく、必要なときにのみ動作するようにしてもよい。以下に、本変形例に係る通信システム1Bについて詳細に説明する。
上記実施の形態では、送信装置10は、3つの信号SIGA~SIGCを用いて通信を行ったが、これに限定されるものではない。以下に、本変形例に係る送信装置10Cについて詳細に説明する。
また、これらの変形例のうちの2以上を組み合わせてもよい。
次に、第2の実施の形態に係る通信システム2について説明する。本実施の形態は、信号TxF,TxPに基づいて、プリドライバ部25Dの動作を制御する遷移制御部を用いて送信装置50を構成したものである。なお、上記第1の実施の形態に係る通信システム1と実質的に同一の構成部分には同一の符号を付し、適宜説明を省略する。
上記実施の形態に係る通信システム2に、上記第1の実施の形態の各変形例を適用してもよい。
次に、上記実施の形態および変形例で説明した通信システムの適用例について説明する。
前記3つの第1のドライバ部にそれぞれ対応して設けられ、それぞれが所定数の信号を含み、互いに異なる3つの第1の制御信号に基づいて、対応する第1のドライバ部をそれぞれ駆動する3つの第1のプリドライバ部と、
所定数の信号を含む第2の制御信号に基づいて動作する第2のプリドライバ部と、
前記3つの第1の制御信号および前記第2の制御信号に含まれる複数の信号のうちの遷移する信号の数が、遷移タイミング間で同じになるように、前記第2の制御信号に含まれる前記所定数の信号の遷移を制御する制御部と
を備えた送信装置。
データ信号に基づいて、前記3つの第1の制御信号を生成する第1の制御部と、
前記データ信号の遷移に基づいて、前記第2の制御信号を生成する第2の制御部と
を有する
前記(1)に記載の送信装置。
前記データ信号に含まれる3つの信号のうちの遷移する信号の数は、前記3つの第1の制御信号に含まれる複数の信号のうちの遷移する信号の数と対応している
前記(2)に記載の送信装置。
前記制御部は、
前記データ信号に基づいて、前記3つの第1の制御信号を生成する第1の制御部と、
前記遷移信号に基づいて、前記第2の制御信号を生成する第2の制御部と
を有する
前記(1)に記載の送信装置。
前記(4)に記載の送信装置。
前記第2の制御信号は、2つの信号を含む
前記(1)から(5)のいずれかに記載の送信装置。
前記(6)に記載の送信装置。
前記(7)に記載の送信装置。
前記制御部は、前記第1の動作モードにおいて、前記3つの第1の制御信号および前記第2の制御信号に含まれる複数の信号のうちの遷移する信号の数が、遷移タイミング間で同じになるように、前記第2の制御信号に含まれる前記所定数の信号の遷移を制御する
前記(1)から(8)のいずれかに記載の送信装置。
前記第2のプリドライバ部は、前記第2のドライバ部を駆動し、
前記第2のドライバ部は、前記第2の動作モードにおいて信号を出力する
前記(9)に記載の送信装置。
出力端子と、
ゲートと、第1の電源に導かれたドレインと、前記出力端子に導かれたソースとを有する第1のトランジスタと、
ゲートと、前記出力端子に導かれたドレインと、第2の電源に導かれたソースとを有する第2のトランジスタと
を有し、
前記3つの第1のプリドライバ部のそれぞれは、
その第1のプリドライバ部に対応する第1のドライバ部における第1のトランジスタのゲートを駆動する第1のプリドライバと、
その第1のプリドライバ部に対応する第1のドライバ部における第2のトランジスタのゲートを駆動する第2のプリドライバと
を有する
前記(1)から(10)のいずれかに記載の送信装置。
前記第3のドライバ部は、
ゲートと、第1の電源に導かれたドレインと、ソースとを有する第1のトランジスタと、
ゲートと、前記第1のトランジスタのソースに導かれたドレインと、第2の電源に導かれたソースとを有する第2のトランジスタと
を有し、
前記第2のプリドライバ部は、前記第3のドライバ部を駆動する
前記(1)から(9)のいずれかに記載の送信装置。
前記第2のプリドライバ部は、前記キャパシタ部を駆動する
前記(1)から(9)のいずれかに記載の送信装置。
前記複数の第1のドライバ部にそれぞれ対応して設けられ、それぞれが所定数の信号を含み、互いに異なる複数の第1の制御信号に基づいて、対応する第1のドライバ部をそれぞれ駆動する複数の第1のプリドライバ部と、
所定数の信号を含む第2の制御信号に基づいて動作する第2のプリドライバ部と、
前記複数の第1の制御信号および前記第2の制御信号に含まれる複数の信号のうちの遷移する信号の数が、遷移タイミング間で同じになるように、前記第2の制御信号に含まれる前記所定数の信号の遷移を制御する制御部と
を備えた送信装置。
受信装置と
を備え、
前記送信装置は、
3つの第1のドライバ部と、
前記3つの第1のドライバ部にそれぞれ対応して設けられ、それぞれが所定数の信号を含み、互いに異なる3つの第1の制御信号に基づいて、対応する第1のドライバ部をそれぞれ駆動する3つの第1のプリドライバ部と、
所定数の信号を含む第2の制御信号に基づいて動作する第2のプリドライバ部と、
前記3つの第1の制御信号および前記第2の制御信号に含まれる複数の信号のうちの遷移する信号の数が、遷移タイミング間で同じになるように、前記第2の制御信号に含まれる前記所定数の信号の遷移を制御する制御部と
を有する
通信システム。
前記3つのドライバ部から送信される信号を受信する受信部と、
前記受信部が受信した信号に基づいて、通信状態を示す検出信号を生成する検出部と
を備え、
前記制御部は、前記検出信号に基づいて、前記第2の制御信号に含まれる前記所定数の信号の遷移を制御する
前記(15)に記載の通信システム。
Claims (16)
- 3つの第1のドライバ部と、
前記3つの第1のドライバ部にそれぞれ対応して設けられ、それぞれが所定数の信号を含み、互いに異なる3つの第1の制御信号に基づいて、対応する第1のドライバ部をそれぞれ駆動する3つの第1のプリドライバ部と、
所定数の信号を含む第2の制御信号に基づいて動作する第2のプリドライバ部と、
前記3つの第1の制御信号および前記第2の制御信号に含まれる複数の信号のうちの遷移する信号の数が、遷移タイミング間で同じになるように、前記第2の制御信号に含まれる前記所定数の信号の遷移を制御する制御部と
を備えた送信装置。 - 前記制御部は、
データ信号に基づいて、前記3つの第1の制御信号を生成する第1の制御部と、
前記データ信号の遷移に基づいて、前記第2の制御信号を生成する第2の制御部と
を有する
請求項1に記載の送信装置。 - 前記データ信号は、3つの信号を含み、
前記データ信号に含まれる3つの信号のうちの遷移する信号の数は、前記3つの第1の制御信号に含まれる複数の信号のうちの遷移する信号の数と対応している
請求項2に記載の送信装置。 - 送信シンボル間の遷移を示す遷移信号に基づいて、前記送信シンボルのシーケンスを示すデータ信号を生成するデータ信号生成部をさらに備え、
前記制御部は、
前記データ信号に基づいて、前記3つの第1の制御信号を生成する第1の制御部と、
前記遷移信号に基づいて、前記第2の制御信号を生成する第2の制御部と
を有する
請求項1に記載の送信装置。 - 前記遷移信号は、前記3つの第1の制御信号に含まれる複数の信号のうちの遷移する信号の数と対応している
請求項4に記載の送信装置。 - 前記第1の制御信号のそれぞれは、2つの信号を含み、
前記第2の制御信号は、2つの信号を含む
請求項1に記載の送信装置。 - 前記3つの第1の制御信号に含まれる6つの信号のうちの遷移する信号の数は2または4である
請求項6に記載の送信装置。 - 前記3つの第1の制御信号および前記第2の制御信号に含まれる8つの信号のうちの遷移する信号の数は4である
請求項7に記載の送信装置。 - 第1の動作モードおよび第2の動作モードを有し、
前記制御部は、前記第1の動作モードにおいて、前記3つの第1の制御信号および前記第2の制御信号に含まれる複数の信号のうちの遷移する信号の数が、遷移タイミング間で同じになるように、前記第2の制御信号に含まれる前記所定数の信号の遷移を制御する
請求項1に記載の送信装置。 - 第2のドライバ部をさらに備え、
前記第2のプリドライバ部は、前記第2のドライバ部を駆動し、
前記第2のドライバ部は、前記第2の動作モードにおいて信号を出力する
請求項9に記載の送信装置。 - 前記3つの第1のドライバ部のそれぞれは、
出力端子と、
ゲートと、第1の電源に導かれたドレインと、前記出力端子に導かれたソースとを有する第1のトランジスタと、
ゲートと、前記出力端子に導かれたドレインと、第2の電源に導かれたソースとを有する第2のトランジスタと
を有し、
前記3つの第1のプリドライバ部のそれぞれは、
その第1のプリドライバ部に対応する第1のドライバ部における第1のトランジスタのゲートを駆動する第1のプリドライバと、
その第1のプリドライバ部に対応する第1のドライバ部における第2のトランジスタのゲートを駆動する第2のプリドライバと
を有する
請求項1に記載の送信装置。 - 第3のドライバ部をさらに備え、
前記第3のドライバ部は、
ゲートと、第1の電源に導かれたドレインと、ソースとを有する第1のトランジスタと、
ゲートと、前記第1のトランジスタのソースに導かれたドレインと、第2の電源に導かれたソースとを有する第2のトランジスタと
を有し、
前記第2のプリドライバ部は、前記第3のドライバ部を駆動する
請求項1に記載の送信装置。 - キャパシタ部をさらに備え、
前記第2のプリドライバ部は、前記キャパシタ部を駆動する
請求項1に記載の送信装置。 - 複数の第1のドライバ部と、
前記複数の第1のドライバ部にそれぞれ対応して設けられ、それぞれが所定数の信号を含み、互いに異なる複数の第1の制御信号に基づいて、対応する第1のドライバ部をそれぞれ駆動する複数の第1のプリドライバ部と、
所定数の信号を含む第2の制御信号に基づいて動作する第2のプリドライバ部と、
前記複数の第1の制御信号および前記第2の制御信号に含まれる複数の信号のうちの遷移する信号の数が、遷移タイミング間で同じになるように、前記第2の制御信号に含まれる前記所定数の信号の遷移を制御する制御部と
を備えた送信装置。 - 送信装置と、
受信装置と
を備え、
前記送信装置は、
3つの第1のドライバ部と、
前記3つの第1のドライバ部にそれぞれ対応して設けられ、それぞれが所定数の信号を含み、互いに異なる3つの第1の制御信号に基づいて、対応する第1のドライバ部をそれぞれ駆動する3つの第1のプリドライバ部と、
所定数の信号を含む第2の制御信号に基づいて動作する第2のプリドライバ部と、
前記3つの第1の制御信号および前記第2の制御信号に含まれる複数の信号のうちの遷移する信号の数が、遷移タイミング間で同じになるように、前記第2の制御信号に含まれる前記所定数の信号の遷移を制御する制御部と
を有する
通信システム。 - 前記受信装置は、
前記3つのドライバ部から送信される信号を受信する受信部と、
前記受信部が受信した信号に基づいて、通信状態を示す検出信号を生成する検出部と
を備え、
前記制御部は、前記検出信号に基づいて、前記第2の制御信号に含まれる前記所定数の信号の遷移を制御する
請求項15に記載の通信システム。
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JP2011517159A (ja) * | 2008-03-05 | 2011-05-26 | クゥアルコム・インコーポレイテッド | 多元送信機システム及び方法 |
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JP2012023852A (ja) * | 2010-07-14 | 2012-02-02 | Renesas Electronics Corp | 過電流保護回路、及び半導体装置 |
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US9473134B2 (en) * | 2014-01-28 | 2016-10-18 | Stmicroelectronics International N.V. | System and method for a pre-driver circuit |
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