WO2013121764A1 - レシーバー回路、通信システム、電子機器、及びレシーバー回路の制御方法 - Google Patents
レシーバー回路、通信システム、電子機器、及びレシーバー回路の制御方法 Download PDFInfo
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- WO2013121764A1 WO2013121764A1 PCT/JP2013/000720 JP2013000720W WO2013121764A1 WO 2013121764 A1 WO2013121764 A1 WO 2013121764A1 JP 2013000720 W JP2013000720 W JP 2013000720W WO 2013121764 A1 WO2013121764 A1 WO 2013121764A1
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- 238000004891 communication Methods 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 19
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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
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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
- H04L7/0079—Receiver details
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
- H04L7/0033—Correction by delay
- H04L7/0037—Delay of clock signal
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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
Definitions
- the present invention relates to a receiver circuit, a communication system including the receiver circuit, an electronic device, a control method for the receiver circuit, and the like.
- an integrated circuit device can operate without any problem even if it is connected to another integrated circuit device by guaranteeing only its input / output characteristics, and each is operated as a communication system with one side as the transmitter side and the other as the receiver side. I was able to.
- the frequency of the interface signal between the integrated circuit devices reaches a region exceeding 200 MHz to 400 MHz, a difference in timing between different signals becomes a problem.
- the difference in timing between the clock signal and the data signal transmitted in synchronization therewith, or the difference in timing between the data signals a situation in which the data signal cannot be captured correctly is caused.
- SerDes SerDes (SERializer / DESerializer) or the like
- a method of transmitting and receiving a clock signal and a data signal by superimposing them on one signal line under a certain algorithm may be adopted.
- Patent Document 1 discloses a data transmission circuit in which the skew between data signals is reduced as much as possible. Specifically, in this data transmission circuit, the time difference between the reception timing when the predetermined signal is transmitted to each of the first transmission path and the second transmission path and the predetermined target timing is zero. Or, the drive capacity on the transmitter side is changed so as to be minimized.
- the characteristics of the integrated circuit device need to take into account process variations depending on the manufacturing process, temperature characteristics, measurement variations, device differences in measurement devices, delay due to the capacity of the probe card for measurement, measurement resolution, and the like.
- FIG. 16 shows an example of variation factors and measured values that affect the characteristics of the integrated circuit device.
- FIGS. 17A and 17B are explanatory diagrams illustrating the influence of the variation factor of FIG. 16 on the characteristics of the integrated circuit device.
- FIG. 17A shows an explanatory diagram of the influence of the variation factor of FIG. 16 on the characteristics of the integrated circuit device on the transmitter side.
- FIG. 17B is an explanatory diagram of the influence of the variation factors in FIG. 16 on the characteristics of the integrated circuit device on the receiver side.
- the variation factors described above are manufactured by a manufacturing process of, for example, 0.18 ⁇ m, and values as shown in FIG. 16 are given as actual measurement values.
- each of the setup time and hold time of the integrated circuit device needs to consider 0.68 ns obtained by adding the values of the variation factors of all factors.
- setup time and hold time are 0.8 ns as a characteristic of an integrated circuit device that transmits and receives signals of 200 MHz to 400 MHz, for example, using the above manufacturing process.
- the present invention has been made to solve at least a part of the above problems, and can be realized as the following forms or modes.
- the receiver circuit that captures an input signal at a plurality of capture timings determined based on the capture clock signal changes to the first state or the second state.
- a delay circuit that outputs a signal delayed by a set delay time, a latch circuit that captures the input signal delayed by the delay circuit at each capture timing, and a test of the latch signal captured by the latch circuit
- a data test result register in which a test result value corresponding to the test result of the data test circuit is set, and the data test circuit is loaded into the latch circuit at each fetch timing
- the latch signal is compared with the expected value, and the comparison result is output.
- the optimum delay time can be determined by capturing a predetermined input signal while changing the delay time of the delay circuit. For this reason, an input signal delayed by the determined optimum delay time is captured at a predetermined capture timing, so that even a high-speed signal can be received with high accuracy. Thereby, it is possible to realize high-accuracy high-speed signal reception with a simple configuration without providing a PLL circuit.
- the delay time of the input signal is adjusted in consideration of the allowable value of the timing of the transmitter circuit and the receiver circuit, the mounting factor in the COF, the variation in inductance caused by the bending of the COF, the difference in individual bending conditions, etc. Will be able to.
- the optimum delay time for the input signal can be obtained without being affected by the variation factors of other input signals having a small margin. Can be determined and adjusted.
- the latch data corresponding to the latch signal captured at each capture timing for each different delay time set in the delay circuit is A delay value adjusting unit configured to adjust a delay time of the delay circuit based on the test result value so as to coincide with a given first pattern;
- the optimum delay time of the delay circuit can be determined autonomously and the delay circuit can be set to the optimum delay time. Become. Therefore, in addition to the above effects, control from the outside to the receiver circuit can be greatly simplified.
- each capture timing is at the center of a period in which the first state or the second state continues.
- a delay value adjusting unit configured to adjust a delay time of the delay circuit based on the test result value;
- the delay circuit includes a current drive capability of a delay element constituting the delay circuit and an output thereof. At least one of the number of delay elements in the signal path of the signal is changed.
- the delay time of the delay circuit in order to determine the optimum delay time, can be changed in a minute unit so that the optimum delay time can be determined with higher accuracy. Become.
- the receiver circuit according to a fifth aspect of the present invention is the receiver circuit according to any one of the first to fourth aspects, after the operation start of the receiver circuit, before the display start using the input signal, and The data verification circuit verifies the latch signal at at least one timing of the blanking period of the display using the input signal.
- the receiver circuit according to the sixth aspect of the present invention is the receiver circuit according to any one of the first to fifth aspects, wherein the first state is determined from the period of the capture timing based on the test result value.
- it includes a first cross point detection unit that detects a cross point shift of the input signal input as a differential signal when it is determined that the period during which the second state continues is long.
- the receiver circuit according to a seventh aspect of the present invention is the receiver circuit according to any one of the first to sixth aspects, wherein the falling edge and the rising edge of the fetch clock signal are based on the test result value. , And a period in which the first state or the second state continues when captured in the order of the falling edge, and a rising edge, a falling edge, and a rising edge of the captured clock signal.
- a second cross that detects a shift in a cross point of the fetched clock signal that is input as a differential signal when it is determined that the period in which the first state or the second state continues is sometimes different Includes point detector.
- the cross point of the clock signal can be adjusted, in addition to the above effects, it is possible to capture a high-speed signal more accurately.
- the receiver circuit according to an eighth aspect of the present invention is the receiver circuit according to the seventh aspect, wherein when the second cross-point detector detects a cross-point shift of the fetch clock signal, the capture circuit A cross point adjustment unit for adjusting the cross point of the clock signal is included.
- the cross point can be adjusted in the receiver circuit without controlling the transmitter circuit, a high-speed signal can be captured more accurately with a simple configuration.
- a communication system includes the receiver circuit according to any one of the first to eighth aspects and a transmitter circuit that transmits the input signal to the receiver circuit.
- the communication system includes a receiver circuit according to a sixth correspondence description, and a transmitter circuit that transmits the input signal to the receiver circuit.
- the cross point detector When a cross point shift of the input signal is detected by the cross point detector, the cross point of the input signal is adjusted.
- a communication system includes the receiver circuit according to the seventh aspect, and a transmitter circuit that transmits the input signal to the receiver circuit.
- the cross point detection unit detects a cross point shift of the fetch clock signal, the cross point of the fetch clock signal is adjusted.
- the electronic device includes the communication system according to any one of the ninth to eleventh aspects.
- the control method of the receiver circuit that captures an input signal at a plurality of capture timings determined based on the capture clock signal changes to the first state or the second state.
- a delay control step for outputting the input signal with a delay of a set delay time, a latch step for fetching the input signal delayed in the delay control step at each fetch timing, and a latch step fetched by the latch step.
- a data verification step for verifying a latch signal; and a delay value adjustment step for adjusting the delay time based on a verification result of the data verification step.
- the data verification step the data acquired at each acquisition timing The latch signal is compared with the expected value.
- the optimum delay time can be determined by capturing a predetermined input signal while changing the delay time of the delay circuit. For this reason, an input signal delayed by the determined optimum delay time is captured at a predetermined capture timing, so that even a high-speed signal can be received with high accuracy. Thereby, it is possible to realize high-accuracy high-speed signal reception with a simple configuration without providing a PLL circuit.
- the delay time of the input signal is adjusted in consideration of the allowable value of the timing of the transmitter circuit and the receiver circuit, the mounting factor in the COF, the variation in inductance caused by the bending of the COF, the difference in individual bending conditions, etc. Will be able to.
- the optimum delay time for the input signal can be obtained without being affected by the variation factors of other input signals having a small margin. Can be determined and adjusted.
- FIG. 4 is a diagram illustrating a configuration example of a delay circuit in FIG. 3.
- FIGS. 7A to 7E are operation explanatory views of the first receiver circuit.
- FIG. 8 is a diagram showing a latch signal taken into the data latch circuit in FIGS. 7A to 7E.
- FIG. 15A is a perspective view of a configuration of a mobile personal computer.
- FIG. 15B is a perspective view of a structure of a mobile phone.
- FIG. 17A is an explanatory diagram of the influence of the variation factor of FIG. 16 on the characteristics of the integrated circuit device on the transmitter side.
- FIG. 17B is an explanatory diagram of the influence of the variation factors of FIG. 16 on the characteristics of the integrated circuit device on the receiver side.
- FIG. 1 shows a configuration example of a display module in which the communication system according to the first embodiment of the present invention is mounted.
- the display module 10 includes a PCB 20, a panel substrate 30, and a COF 40.
- a display controller 22 including the transmitter 100 and a connector 24 are mounted, and a wiring 26 is formed to connect between a connection portion included in the display controller 22 and a connection portion included in the connector 24.
- the panel substrate 30 is provided with a pixel region 32 in which a plurality of pixels arranged in a matrix are formed, and wiring for supplying a drive signal and a power supply voltage to each pixel is formed.
- the COF 40 is mounted with a connector 42 connected to the connector 24 of the PCB 20 and a display driver 44 including the receiver 200, and wiring for connecting between a connection part of the connector 42 and a connection part of the display driver 44 is provided. Is formed.
- the output terminal of the display driver 44 is connected to a wiring formed on the panel substrate 30.
- the PCB 20 may be mounted with a CPU (Central Processing Unit) that controls the display module 10, a memory, and other dedicated chips in addition to the display controller 22.
- a communication system is configured by the transmitter 100 of the display controller 22 and the receiver 200 of the display driver 44.
- the display controller 22 performs given image processing on display data supplied from an image supply device (not shown), and supplies the display driver 44 with a data signal and a display timing signal corresponding to the display data after the image processing.
- the display driver 44 drives pixels formed in the pixel region 32 via wiring formed in the panel substrate 30 based on display data corresponding to the data signal in synchronization with the display timing signal.
- the data signal corresponding to the display data after the image processing is transmitted by the transmitter 100 of the display controller 22 and received by the receiver 200 of the display driver 44 via the wiring 26, the connectors 24 and 42, and the wiring of the COF 40.
- the transmitter 100 converts display data into serial data, converts the display data into a data signal that is a differential signal, transmits the data signal to the receiver 200, converts the clock signal into a differential signal, and transmits the differential signal to the receiver 200.
- the transmitter 100 can also transmit the display timing signal to the receiver 200 in the same manner.
- the receiver 200 includes a delay circuit for each signal line, and an optimal delay time can be determined by capturing a specific signal transmitted by the transmitter 100 while changing the delay time of the delay circuit. It is like that. Accordingly, by capturing the data signal from the transmitter 100 delayed by the determined optimum delay time at a predetermined capture timing, it is possible to receive data with high accuracy even for a high-speed signal. That is, since the receiver 200 can always capture a data signal delayed by an optimal delay time with respect to a predetermined capture timing, a high-accuracy high-speed signal can be obtained with a simple configuration without providing a PLL circuit. Can be realized.
- FIG. 2 schematically shows a configuration example of the transmitter 100 and the receiver 200 in FIG.
- a data signal and a clock signal are transmitted from the transmitter 100 to the receiver 200 via eight pairs of differential signal lines for data and display timing signals and a pair of differential signal lines for clocks. Shall be.
- Transmitter 100 includes a PLL circuit 110, a clock transmitter circuit 120, and a transmitter circuit 130 8 of the first transmitter circuits 130 1 to 8.
- the clock transmitter circuit 120 is a transmitter circuit for transmitting a clock signal.
- Transmitter circuit 130 8 of the first transmitter circuits 130 1 through 8 are transmitter circuits for transmitting the data and the display timing signals.
- PLL circuit 110 generates a transmit clock signal based on the reference clock, not shown, supplies the transmit clock signal clock transmitter circuit 120, the transmitter circuit 130 8 of the first transmitter circuits 130 1 to 8.
- the clock transmitter circuit 120 includes a parallel serial (hereinafter referred to as P / S) converter 122 and a differential transmitter 124.
- the P / S converter 122 converts to serial data in which the transmission clock signal is incorporated into predetermined pattern data in synchronization with the transmission clock signal.
- the differential transmitter 124 generates a pair of differential signals corresponding to the serial data from the P / S conversion unit 122 and outputs the differential signals to the receiver 200 via the differential signal lines CLKP and CLKN.
- the first transmitter circuit (transmitter circuit in a broad sense) 130 1 includes a P / S converter 132 1 and a differential transmitter 134 1 .
- P / S conversion unit 132 1 in synchronization with the transmission clock signal, converts the transmission data SD1 to the serial data.
- the differential transmitter 134 1 generates a pair of differential signals corresponding to the serial data from the P / S conversion unit 132 1 and outputs the differential signals to the receiver 200 via the differential signal lines SDP1 and SDN1.
- the transmitter circuit 130 8 of the 8 includes a P / S conversion unit 132 8, and a differential transmitter 134 8.
- P / S conversion unit 132 8 in synchronization with the transmission clock signal, converts the transmission data SD8 into serial data.
- Differential transmitter 134 8 generates a pair of differential signal corresponding to the serial data from the P / S conversion unit 132 8, and outputs to the receiver 200 through the differential signal lines SDP8, SDN8.
- each transmitter circuit when adjusting the cross point of a pair of differential signal which a differential transmitter outputs, each transmitter circuit can be provided with the cross point adjustment part corresponding to a differential transmitter. That is, the clock transmitter circuit 120 can include the cross point adjustment unit 126.
- the first transmitter circuit 130 1 may include a cross point adjustment unit 136 1 corresponding to the differential transmitter 134 1 .
- the transmitter circuit 130 8 of the second transmitter circuits 130 2 to 8 may comprise a cross-point adjustment unit 136 1-136 8 corresponding to the differential transmitter 1341 ⁇ 134 8.
- Each crosspoint adjustment unit controls a driving unit of a corresponding differential transmitter under control from a CPU (not shown) mounted on the PCB 20 to change a current driving capability for driving at least one of a pair of differential signals. To do. Thereby, the cross point of a pair of differential signals can be adjusted.
- Receiver 200 includes a clock receiver 210, and a multi-phase clock generation circuit 220, and a receiver circuit 230 8 of the first receiver circuits 230 1 to 8.
- the clock receiver 210 receives a differential signal transmitted by the differential transmitter 124 of the clock transmitter circuit 120 via the differential signal lines CLKP and CLKN.
- the multiphase clock generation circuit 220 extracts a clock signal from the reception signal received by the clock receiver 210 and generates a multiphase clock signal.
- Each phase of the clock signal generated by multi-phase clock generation circuit 220 is supplied as a capture clock signal of each of the data latch circuit of the receiver circuit 230 8 of the first receiver circuits 230 1 to 8.
- the first receiver circuit (receiver circuit in a broad sense) 230 1 includes a differential receiver 232 1 , a delay circuit 234 1, and a data latch circuit (latch circuit in a broad sense) 236 1 .
- the differential receiver 232 1 receives the differential signal transmitted via the differential signal lines SDP 1 and SDN 1 by the differential transmitter 134 1 of the first transmitter circuit 130 1 .
- the delay circuit 234 1 is configured to be capable of adjusting the delay time. When a data signal from the differential receiver 232 1 is input as an input signal, the delay circuit 234 1 is delayed by the delay time set at that time, and it outputs the data latch circuit 236 1.
- Data latch circuit 236 a plurality of capture timing determined based on one of the clock signals of the multiphase clock signals generated by the multiphase clock generating circuit 220 takes in the output signal of the delay circuit 234 1.
- the capture timing is, for example, a rising edge and a falling edge of the clock signal.
- the received data RD1 is outputted.
- the receiver circuit 230 8 of the second receiver circuits 230 2 to 8 is provided with differential receivers 232 1 to 232 8, a delay circuit 234 1 to 234 8, and a data latch circuit 236 1 to 236 8 ing.
- Each receiver circuit receives the differential signal transmitted from the corresponding transmitter circuit, delays it in the delay circuit, and captures it in the data latch circuit.
- the receiver circuit 230 8 of the 8 includes a differential receiver 232 8, a delay circuit 234 8, and a data latch circuit 236 8.
- Differential receivers 232 8, a differential transmitter 134 8 of the eighth transmitter circuit 130 8 receives a differential signal transmitted through the differential signal lines SDP8, SDN8.
- the delay circuit 234 8 is configured to allow adjustment of the delay time, when the data signal from the differential receiver 232 8 as the input signal, is delayed by a delay time which has been set at that time, and it outputs the data latch circuit 236 8.
- Data latch circuit 236 8 a plurality of capture timing determined based on one of the clock signals of the multiphase clock signals generated by the multiphase clock generating circuit 220 takes in the output signal of the delay circuit 234 8. In response to the latch signal captured by the data latch circuit 236 8, the received data RD8 is output.
- first receiver circuit 230 1 a detailed configuration example of the first receiver circuit 230 1 will be described, and details of the second receiver circuit 230 2 to the eighth receiver circuit 230 8 having the same configuration as the first receiver circuit 230 1 will be described. A description of the configuration example is omitted.
- Figure 3 shows a block diagram of a first receiver circuit 230 1 of a detailed configuration example.
- the same parts as those in FIG. 3 are identical to FIG. 3, the same parts as those in FIG.
- the first receiver circuit 230 1 includes an input interface (Inter Face: hereinafter referred to as I / F) unit 238 1 and a delay. and a value setting register 240 1. Further, the first receiver circuit 230 1 includes a data verification enable register 242 1 , a delay value setting unit 244 1 , a data verification circuit 246 1 , a data verification result register 248 1, and an output I / F unit 250 1 . It has. Note that the function of the input I / F unit 238 1 and the function of the output I / F unit 250 1 may be realized by a single I / F unit.
- the input I / F unit 238 1 performs input interface processing when a CPU (not shown) accesses the delay value setting register 240 1 and the data verification enable register 242 1 .
- the delay value setting register 240 1 is a register configured to be accessible by the CPU via the input I / F unit 238 1 , and a setting value corresponding to the delay value is set by the CPU.
- the data verification enable register 242 1 is a register configured to be accessible by the CPU via the input I / F unit 238 1 , and is a register that sets the data verification processing to an enabled state when accessed by the CPU. Data test process is performed on the data signal changes to H level in a predetermined pattern transmitted by the first transmitter circuit 130 1 (first state) or an L level (the second state).
- the delay value setting unit 244 1 sets the delay time of the delay circuit 234 1 based on the set value set in the delay value setting register 240 1 .
- the delay circuit 234 1 delays the data signal received by the differential receiver 232 1 by a delay time corresponding to the set value set in the delay value setting register 240 1 and outputs the delayed signal.
- a delay circuit 234 1 has one or a plurality of delay elements, and based on the set value set in the delay value setting register 240 1 , the delay element in the current drive capability of the delay element and the signal path of its output signal Change at least one of the numbers.
- the data latch circuit 236 1 is accept clock signal is input, a plurality of capture timing is determined based on said mounting write clock signal, it takes in the data signal delayed by the delay circuit 234 1, the received data Output as RD1.
- the data verification circuit 246 1 verifies the latch signal fetched by the data latch circuit 236 1 .
- Data detection circuit 246 1 compares the latched signal data signals in a given period of time has been taken at each reading time, and a predetermined expected value, the comparison result, the corresponding set value (Delay Value) and output as a test result value.
- the data test result register 248 1 is set with the test result value from the data test circuit 246 1 .
- the data test result register 248 1 is a register configured to be accessible by the CPU via the output I / F unit 250 1 , and the test result value is read by the CPU.
- the output I / F unit 250 1 performs output interface processing when the CPU accesses the data test result register 248 1 .
- the delay circuit 234 1 is provided with a plurality of first delay elements DL1, a plurality of second delay element DL2, and an output selector SEL.
- the plurality of first delay elements DL1 are connected in cascade, and the data signal from the differential receiver 232 1 is input to the input of the first delay element DL1 in the first stage, and each first delay element DL1 The output is connected to the output selection unit SEL.
- the output of each first delay element DL1 is also connected to the output selection unit SEL via each second delay element DL2.
- the second delay element DL2 is connected to the high potential side power supply via any one of a plurality of resistance elements having different resistance values, and can adjust the delay time of the rise of the output signal. ing.
- the second delay element DL2 is connected to the low-potential-side power supply via any one of a plurality of resistance elements having different resistance values, and can adjust the delay time of the fall of the output signal. It is like that.
- the delay value setting unit 244 1 outputs a control signal Dcnt corresponding to the set value set in the delay value setting register 240 1 to the plurality of second delay elements DL2 and the output selection unit SEL.
- Each second delay element DL2 is connected to a high-potential-side power supply and a low-potential-side power supply through a resistance element selected based on the control signal Dcnt.
- the output selection unit SEL selects one of the outputs of the plurality of first delay elements DL1 and the plurality of second delay elements DL2 based on the control signal Dcnt, and passes through the selected path. and it outputs the data latch circuit 236 1 signal as an output signal.
- the delay circuit 234 1 can change at least one of the current drive capability of the delay element and the number of delay elements in the signal path of the output signal based on the set value set in the delay value setting register 240 1 .
- CPU is repeated setting while shifting the delay time of the delay circuit 234 1.
- the first receiver circuit 230 each time, performs data assayed after capturing input data signals, CPU, based on these data assay results, it calculates the optimum delay value.
- FIG. 5 and 6 show a flow diagram of a first receiver circuit 230 1 of the control of the first embodiment.
- FIG. 5 shows a control example of the CPU that controls the first receiver circuit 2301
- FIG. 6 shows a detailed processing example of step S6 of FIG.
- a memory (not shown) stores a program corresponding to each step shown in FIGS. 5 and 6, and the CPU executes a process corresponding to the program read from the memory.
- CPU accesses the data test enable register 242 1, sets the data verification processing in an enabled state (step S1).
- CPU sets the set value corresponding to the delay value to the delay value setting register 240 1 (step S2).
- the delay value setting unit 244 1 sets the delay time of the delay circuit 234 1 based on the set value in step S2.
- the first transmitter circuit 130 1 transmits a predetermined data signal to the first receiver circuit 230 1, the first receiver circuit 230 1, the delay time set by the data signal It will capture the data latch circuit 236 1 after delaying.
- step S2 The CPU, after step S2 and waits until the read timing data assay results register 248 1 (step S3: N). Then, at readout timing, CPU accesses the data assay results register 248 1, reads the test result value is a register value of the data test result register 248 1 (step S4).
- step S5 When data with test at the next delay value (step S5: Y), CPU sets the set value corresponding to the next delay value in the delay value setting register 240 1 (step S2).
- step S5 when the next data test is not performed (step S5: N), the CPU calculates an optimum delay value based on the plurality of test result values read in step S4 (step S6).
- step S6 the CPU determines the length of the period in which the plurality of latch signals at the respective capture timings are continuously at the H level based on the plurality of test result values with different delay times. Whether or not can be determined is determined (step S10).
- step S10: Y the CPU calculates an optimum delay value based on the test result value (step S11, end). For example, when a plurality of latch signals change from L level to H level and then return to L level, if a continuous H level period can be determined, the delay value near the center of the H level period is the optimum delay value. As required.
- step S10 determines whether or not the detection condition value of the cross point deviation of the data signal transmitted as the differential signal is satisfied based on the test result value. It discriminate
- step S12 When it is determined that the data signal cross point deviation detection condition is satisfied (step S12: Y), the CPU detects the data signal cross point deviation (step S13). For example, when the deviation of the cross point of the data signal is detected in step S13, the cross point adjusting unit 136 1 of the first transmitter circuit 130 1, it is desirable to adjust the cross-point.
- step S12 When it is not determined in step S12 that the detection condition for the cross point deviation of the data signal is satisfied (step S12: N), or following step S13, the CPU executes step S14.
- step S ⁇ b> 14 the CPU determines whether or not a detection condition value for a cross point deviation of a clock signal transmitted as a differential signal is satisfied based on the test result value.
- step S14 When it is determined that the detection condition of the clock signal cross point shift is satisfied (step S14: Y), the CPU detects the cross point shift of the clock signal (step S15). For example, it is desirable to adjust the cross point by the cross point adjusting unit 126 of the clock transmitter circuit 120 when the shift of the cross point of the clock signal is detected in step S15.
- step S14 When it is not determined in step S14 that the detection condition of the cross point deviation of the clock signal is satisfied (step S14: N), or following step S15, the CPU executes step S7.
- step S7 CPU accesses the data test enable register 242 1, sets the data verification processing disable state.
- CPU sets the set values corresponding to delay values obtained as a result calculated in step S6 to the delay value setting register 240 1 (step S8), and the process ends.
- the first receiver circuit 230 a data signal that changes in a particular pattern, is output delayed by the delay time set (delay control step), sampled each data signal obtained by this delay (Latch step).
- the delay value setting unit 244 1, the delay time of the delay circuit 234 1 is set on the basis of the set value in step S8. Therefore, the data signal transmitted from the first transmitter circuit 130 1 to the first receiver circuit 230 1 can be reliably captured.
- FIGS. 7A to 7E show examples of timing waveforms of the data signal D having different delay times with respect to the fetch clock signal CLK.
- 7A to 7E are pulse signals in which the data signal D changes to H level, and the H level period of the data signal D is from a half cycle of the fetch clock signal CLK. Represents an example of a long case.
- FIG. 7A shows an example of timing waveforms of the data signal D and the capture clock signal CLK at the delay time DT1.
- FIG. 7B shows an example of timing waveforms of the data signal D and the capture clock signal CLK when the delay time DT2 (DT2> DT1).
- FIG. 7C illustrates an example of timing waveforms of the data signal D and the capture clock signal CLK when the delay time DT3 (DT3> DT2).
- FIG. 7D illustrates an example of timing waveforms of the data signal D and the capture clock signal CLK when the delay time is DT4 (DT4> DT3).
- FIG. 7E illustrates an example of timing waveforms of the data signal D and the capture clock signal CLK when the delay time DT5 (DT5> DT4).
- the capture timing is the rising edge and the falling edge of the capture clock signal CLK.
- the delay time DT1 the data latch circuit 236 1
- the data latch circuit 236 1, the reading time T1 H level, the reading time T2 H level, is the reading time T3 L level is captured.
- the delay time DT3, the data latch circuit 236 1, the reading time T1 L level, H level in reading time T2, the reading time T3, L level is captured.
- the data latch circuit 236 1, L level in reading time T1, the reading time T2 H level, is the reading time T3 H level is captured.
- the delay time DT5 the data latch circuit 236 1, L level in reading time T1, the reading time T2 L level, is the reading time T3 H level is captured.
- Data detection circuit 246 to test the latch signals captured by each pickup timing. In fact, not be taken to fix the H level or L level as the data latch circuit 236 1 shown in FIG. 7 (A) ⁇ FIG 7 (E) in each acquisition timing. That is, even if signals are acquired with the same delay value and at the same acquisition timing, they may be at the H level or the L level. Data detection circuit 246 1, at each reading time, and outputs the result of comparison between the expected value and the latch signals in each reading time as data assay results. For example, as a result of this data test, when data signals are repeatedly acquired under the same conditions, at each acquisition timing, when all the expected values match, when all the expected values do not match, the expected values match or do not match. Can be tested. Such data detection circuit 246 1 Data assay results by is set to a data test result register 248 1 as a test result value.
- Figure 8 shows a latch signal fetched into the data latch circuit 236 1 in FIG. 7 (A) ⁇ FIG 7 (E).
- Focusing on reading time T1 when is shifted sequentially delay time DT1 ⁇ DT5, the data latch circuit 236 1, H level, H level, L level, L level, the L level is captured.
- Focusing on pickup timing T2 when is shifted sequentially delay time DT1 ⁇ DT5, the data latch circuit 236 1, L level, H level, H level, H level, L level is captured.
- focusing on pickup timing T3 when is shifted sequentially delay time DT1 ⁇ DT5, the data latch circuit 236 1, L level, L level, L level, H level, the H level is captured .
- the H level period of the data signal D can be known, and the optimum delay value of the data signal D can be obtained.
- the optimum delay time DLx is an intermediate value between the delay time DT2 and the delay time DT4. Therefore, if the delay value corresponding to the delay time DT2 is d2, and the delay value corresponding to the delay time DT4 is d4, the CPU sets, for example, (d2 + d4) / 2 as the optimum delay value dx in step S11 of FIG. Calculate by calculation. Then, CPU is the setting value corresponding to the delay value dx, is set in the delay value setting register 240 1.
- the first receiver circuit 230 1 can reliably capture the data signal from the first transmitter circuit 130 1 .
- the CPU performs the following process.
- the period of H level of the data signal D is an example of a latch signal is captured in the data latch circuit 236 1 is shorter than half the period of the accept clock signal CLK.
- FIG. 9 shows an example of signal levels for delay times DT1 to DT7, for example.
- the H level period of the data signal D cannot be determined from the signal level results at the respective capture timings in the delay times DT2 and DT6.
- the CPU since it is determined that it means that the cross point of the differential signal is shifted, the CPU detects it as a shift of the cross point of the data signal or the captured clock signal.
- step S12 of FIG. 6 when it is determined that the period in which the H level or L level continues is longer than the period of the capture timing, it is determined that the detection condition of the cross point deviation of the data signal is satisfied.
- step S14 in FIG. 6 a period in which the H level or the L level continues when the falling edge, the rising edge, and the falling edge of the captured clock signal are captured in this order, and the rising edge of the captured clock signal.
- the timing of the data test, etc. by the data detection circuit 246 1, after starting the first receiver circuit 230 1 of the operation, before the display start using a data signal, and at least the display of the blanking interval using the data signal One timing is desirable. By doing so, it is possible to provide a receiver circuit capable of receiving signals at high speed in consideration of mounting factors without affecting display and without providing a PLL circuit or the like.
- the optimum delay time is used.
- Data signals can be captured.
- a high-speed signal can be captured without providing a PLL circuit in the receiver circuit.
- the delay time of the data signal is adjusted in consideration of the allowable timing of the transmitter circuit and the receiver circuit, the mounting factor in the COF, the variation in inductance caused by the bending of the COF, the difference in individual bending conditions, and the like. Will be able to.
- the optimum delay time for the data signal can be obtained without being influenced by the variation factors of other data signals having a small margin. Can be determined and adjusted.
- CPU is has been described as determining the optimal delay time by accessing the first receiver circuit 230 1, but is not limited thereto.
- the receiver circuit autonomously determines the optimum delay time.
- FIG. 10 shows a block diagram of a configuration example of the first receiver circuit in the second embodiment. 10, parts that are the same as those in FIG. 3 are given the same reference numerals, and descriptions thereof will be omitted as appropriate.
- the first receiver circuit 300 1 of the second embodiment is provided in the receiver 200 in place of the first receiver circuit 230 1 of FIG. In this case, instead of each of the second receiver circuit 230 2 to the eighth receiver circuit 230 8 , the second receiver circuit 230 2 to the eighth receiver circuit having the same configuration as the first receiver circuit 300 1 are used. 230 8 is provided.
- the first receiver circuit 300 1 includes an I / F unit 310 1 , a delay value setting register 240 1 , and a data verification enable register 242. 1, and a delay value setting unit 320 1. Further, the first receiver circuit 300 1 includes a data verification circuit 340 1 , a data verification result register 248 1, and a delay value adjustment unit 360 1 .
- the I / F unit 310 1 performs input interface processing when a CPU (not shown) accesses the delay value setting register 240 1 and the data verification enable register 242 1 .
- Delay value setting unit 320 when the data verification processing is enabled, it performs control to change the delay time of the delay circuit 234 1 while updating the delay value.
- the delay value setting unit 320 when the data verification processing is disabled state, sets a delay circuit 234 1 as a delay time corresponding to a setting value set in the delay value setting register 240 1.
- Data detection circuit 340 1 delays for each of a plurality of delay times, on the basis of the data latch circuit 236 1 to repeatedly captured signals at each reading time, performs data verification.
- Delay value adjusting unit 360 based on the data assay results register 248 set test result value to 1 calculates the optimum delay value and outputs the delay value setting unit 320 1.
- Delay value adjusting unit 360 based on the test result value, taking the timing sets the setting value to the delay value setting register 240 1 so that the center of the period during which the H level or L level is continuous.
- the delay value adjusting unit 360 based on the test result value, the latch pattern corresponding to the latch signal taken at each reading time for different delay time set in the delay circuit 234 1, a given to match the first pattern may be set a setting value to the delay value setting register 240 1.
- FIG. 11 shows a first detailed configuration example of the receiver circuit 300 1 of FIG. 10.
- the same parts as those in FIG. 10 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
- the delay value setting unit 320 1 includes a condition setting register 322 1 , a test delay counter 324 1 , a delay test register 326 1 , a delay switch 328 1, and a timing control circuit 330 1 .
- condition setting register 322 1 setting values corresponding to various conditions when performing data verification are set by the CPU via the I / F unit 310 1 .
- the conditions for performing the data verification include the range of the delay time during the data verification, the update unit of the delay time, and the like.
- Assay delay counter 324 1 is in a state in which the data test is set to an enable state, a counter for updating the delay value. Delay value updated by calibrating the delay counter 324 1 is set in the delay test register 326 1.
- the delay switch 328 1 sets the delay time of the delay circuit 234 1 based on the delay value set in the delay verification register 326 1 when the data verification process is set to the enabled state.
- the delay switch 328 data verification process when it is set to the disabled state, sets the delay time of the delay circuit 234 1 based on the delay value set in the delay value setting register 240 1.
- the timing control circuit 330 1 controls each unit constituting the delay value setting unit 320 1 .
- Such timing control circuit 330 when the optimum delay value from the delay value adjusting unit 360 1 is input, sets the set values corresponding to the delay value in the delay value setting register 240 1. Then, the timing control circuit 330 1 switches the delay switch 328 1, sets a delay circuit 234 1 for optimum delay.
- the data verification circuit 340 1 includes an address decoder 342 1 , a plurality of data latches 344 1, and a verification circuit 346 1 .
- a plurality of data latches 344 1 is the type number of the data latches of the delay values that are updated when the data verification processing (delay time).
- the address decoder 342 1 selects the data latch 344 1 corresponding to the delay value updated by the test delay counter 324 1 .
- Selected data latch 344 1 latches the latch signal of the data latch circuit 236 1 captured by the capture timing for each delay value is updated by calibrating the delay counter 324 1.
- Detection circuit 346 for each delay value (delay time), and outputs the test result to comparison result with the expected value and captured latch signal in each acquisition timing.
- the test result by the test circuit 346 1 is set in the data test result register 248 1 . Thereby, for example, a latch pattern at the capture timing T2 in FIG. 8 is obtained as a test result, and a period in which the H level continues can be determined from the test result.
- the delay value adjusting unit 360 based on the test result value, taking the timing sets the setting value to the delay value setting register 240 1 so that the center of the period during which the H level or L level is continuous, the following It can have the structure as follows.
- Figure 12 is a block diagram showing a configuration example of the delay value adjusting unit 360 1 of FIG. 11.
- the delay value adjustment unit 360 1 includes an LH test circuit 362 1 , an HL test circuit 364 1, and a 1 ⁇ 2 operation circuit 366 1 .
- the LH test circuit 362 1 Based on the test result value set in the data test result register 248 1 , the LH test circuit 362 1 tests the timing t 1 at which the level has changed from the L level to the H level.
- the HL test circuit 364 1 tests the timing t2 at which the level has changed from the H level to the L level based on the test result value set in the data test result register 248 1 .
- the optimum delay value is a delay value setting unit 320 1 is input, can be set to the delay circuit 234 1 outputs delays the data signal at the optimal delay time using this delay value .
- the optimum delay time is determined in each corresponding receiver circuit while shifting the delay time of the data signal from each transmitter circuit.
- the data signal can be captured with an optimum delay time.
- the delay time of the data signal is adjusted in consideration of the allowable timing of the transmitter circuit and the receiver circuit, the mounting factor in the COF, the variation in inductance caused by the bending of the COF, the difference in individual bending conditions, and the like. Will be able to.
- the CPU is described as detecting the shift of the cross point between the data signal and the capture clock signal, but the present invention is not limited to this.
- FIG. 13 shows a block diagram of a configuration example of the first receiver circuit in the third embodiment.
- the same parts as those in FIG. 13 are identical parts as those in FIG. 13 in FIG. 13, the same parts as those in FIG. 13, the same parts as those in FIG. 13, the same parts as those in FIG. 13, the same parts as those in FIG. 13, the same parts as those in FIG. 13, the same parts as those in FIG. 13, the same parts as those in FIG. 13, the same parts as those in FIG.
- the third first in an embodiment of the receiver circuit 230a 1 is first receiver circuit 230 is different from the first, the first cross point detecting unit 400 1, 1 and the second cross point detecting unit 410, the cross point adjusting portion 420 1 and is a point that has been added.
- the first cross point detecting unit 400 based on the test result value, detection processing is performed in step S12 in FIG. 6. Specifically, the first cross point detector 400 1, when the period of H level or L level from period consecutive reading time is determined to a long, detecting a shift of the cross point of the data signal.
- Second cross point detecting unit 410 based on the test result value, detection processing is performed in step S14 in FIG. 6. Specifically, the second cross point detecting unit 410 1, a period in which H level or L level is continuous when taken in the order of the falling edge, a rising edge, and falling edge of the accept clock signal, When it is determined that the period when the H level or L level continues when the rising edge, the falling edge, and the rising edge of the captured clock signal are captured in this order, the crossing point shift of the captured clock signal is detected. To detect.
- Cross point adjusting unit 420 when the deviation of the cross point of the first cross point detecting unit 400 1 by the data signal is detected, and controls the driving unit of the differential receivers 232 1, at least a pair of differential signals The current driving capability for driving one of the signals is changed. In this case, it is possible to omit the cross point adjustment unit 136 1 of the transmitter circuit.
- CPU controls the cross point adjustment unit 126 of the clock transmitter circuit 120.
- the cross point adjustment unit 126 controls the driving unit of the differential transmitter 124 to change the current driving capability for driving at least one of the pair of differential signals.
- the cross point of the data signal and the capture clock signal can be adjusted. As a result, a high-speed signal can be captured more accurately.
- FIG. 14 shows a block diagram of a configuration example of the first receiver circuit in the fourth embodiment. 14, the same parts as those in FIG. 2, FIG. 10, or FIG.
- the clock receiver 210 and the multiphase clock generation circuit 220 of FIG. 2 are also shown.
- the first receiver circuit 300a 1 in the fourth embodiment is different from the first receiver circuit 300 1 in that a first cross point detection unit 400 1 and a second cross point detection unit 410 1 are added. It is a point.
- the clock receiver 210 that constitutes the receiver 200, the cross point adjusting unit 430 1 is connected.
- the first cross point detecting unit 400 1 and the second cross point detecting unit 410 1 is the same as FIG. 13.
- the cross point adjustment unit 430 1 controls the driving unit of the clock receiver 210 when the second cross point detection unit 410 1 detects the shift of the cross point of the captured clock signal, and at least the pair of differential signals. The current driving capability for driving one of the signals is changed. In this case, the cross point adjustment unit 126 of the clock transmitter circuit 120 can be omitted.
- first and second cross point detecting unit 410 may be added .
- the display module on which the communication system to which the receiver circuit in any one of the above embodiments is applied can be applied to the following electronic devices, for example.
- FIG. 15A and FIG. 15B are perspective views showing the configuration of an electronic device having a display module on which a communication system to which the receiver circuit in any of the above embodiments is applied is mounted.
- FIG. 15A is a perspective view of a configuration of a mobile personal computer.
- FIG. 15B illustrates a perspective view of a structure of a mobile phone.
- a personal computer 500 shown in FIG. 15A includes a main body portion 510 and a display portion 520.
- the display unit 520 is configured by a display module in which a communication system to which the receiver circuit in any of the above embodiments is applied is mounted. That is, the personal computer 500 includes at least a display module on which a communication system to which the receiver circuit in any of the above embodiments is applied is mounted.
- the main body 510 is provided with a keyboard 530. Operation information via the keyboard 530 is analyzed by a control unit (not shown), and an image is displayed on the display unit 520 in accordance with the operation information. Since the display portion 520 can transmit and receive signals at high speed, it is possible to provide the personal computer 500 capable of displaying very high definition at a low cost.
- a cellular phone 600 illustrated in FIG. 15B includes a main body portion 610 and a display portion 620.
- the display unit 620 is configured by a display module in which a communication system to which the receiver circuit in any of the above embodiments is applied is mounted. That is, the mobile phone 600 includes a display module on which a communication system to which the receiver circuit in any of the above embodiments is applied is mounted.
- the main body 610 is provided with a key 630. Operation information via the key 630 is analyzed by a control unit (not shown), and an image is displayed on the display unit 620 according to the operation information. Since the display portion 620 can transmit and receive signals at high speed, it is possible to provide the mobile phone 600 capable of displaying very high definition at low cost.
- the electronic device on which the communication system to which the receiver circuit in any of the above embodiments is applied is not limited to the one shown in FIGS. 15A and 15B.
- PDAs personal digital assistants
- digital still cameras televisions, video cameras, car navigation devices, pagers, electronic notebooks, electronic papers, calculators, word processors, workstations, videophones, POS (Point of sale systems)
- POS Point of sale systems
- Devices such as terminals, printers, scanners, copiers, video players and touch panels.
- the receiver circuit, the communication system, the control method of the receiver circuit, and the like according to the present invention have been described based on any one of the above embodiments, but the present invention is not limited to any one of the above embodiments. Absent.
- the present invention can be implemented in various modes without departing from the gist thereof, and the following modifications are possible.
- the present invention is not limited to this. That is, it is needless to say that the communication system including the receiver circuit according to the present invention can be applied to a display that is not related to display.
- the present invention is not limited to this. That is, the present invention is not limited to a transmitter circuit that transmits a differential signal to a receiver circuit.
- the display driver 44 is described as being mounted on the COF, but the present invention is not limited to this.
- the display driver 44 may be mounted on the TCP. Further, the display driver 44 may be mounted on another substrate or film other than the PCB 20.
- an optimal delay value is obtained by calculation using five types of delay values as shown in FIGS. 7 (A) to 7 (E).
- the present invention is not limited to this.
- the optimum delay value can be obtained with higher accuracy by using 32 types or 64 types of delay values.
- the present invention has been described as a receiver circuit, a communication system, an electronic device, a control method of the receiver circuit, and the like, but the present invention is not limited to this.
- a program in which a processing procedure of a control method for a receiver circuit according to the present invention is described, and a recording medium on which the program is recorded may be used.
- DESCRIPTION OF SYMBOLS 10 ... Display module, 20 ... PCB, 22 ... Display controller, 30 ... Panel board, 40 ... COF, 42 ... Connector, 44 ... Display driver, 100 ... Transmitter, 110 ... PLL circuit, 120 ... Transmitter circuit for clock, 122, 132 1 to 132 8 ... PS converter, 124, 134 1 to 134 8 ... Differential transmitter, 126, 136 1 to 136 8 , 420 1 , 430 1 ... Crosspoint adjustment unit, 130 1 to 130 8 . Transmitter circuit to eighth transmitter circuit, 200... Receiver, 210... Clock receiver, 220...
- Multi-phase clock generation circuit 230 1 , 230 a 1 , 300 a 1 , 300 1 ... first receiver circuit (receiver circuit), 230 2 to 230 8 Receiver circuit of the second receiver circuits to eighth, 232 1 - 232 8 ... differential receiver, 234 1 - 234 8 ... delay circuit, 236 1 - 236 8 ... data latch circuit, 238 1 ... input I / F unit, 240 1 ... Delay value setting register, 242 1 ... Data test enable register, 244 1 , 320 1 ... Delay value setting unit, 246 1 , 340 1 ... Data test circuit, 248 1 ... Data test result register, 250 1 ... Output I / F section, 310 1 ...
- I / F section 322 1 ... condition setting register, 324 1 ... delay counter for verification, 326 1 ... delay verification register, 328 1 ... delay switch, 342 1 ... address decoder, 344 1 ... data latches, 346 1 ... test circuit, 360 1 ... delay value adjusting unit, 362 1 ... LH test Circuit, 364 1 ... HL test circuit, 366 1 ... 1/2 calculating circuit, 400 1 ... first cross point detecting unit, 410 1 ... second cross point detecting unit.
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Abstract
Description
図17(A)、図17(B)に、図16のばらつき要因が集積回路装置の特性に与える影響の説明図を示す。図17(A)は、図16のばらつき要因が、トランスミッター側の集積回路装置の特性に与える影響の説明図を表す。図17(B)は、図16のばらつき要因が、レシーバー側の集積回路装置の特性に与える影響の説明図を表す。
図1に、本発明の第1の実施形態における通信システムが実装された表示モジュールの構成例を示す。
第1の実施形態では、CPUが、第1のレシーバー回路2301にアクセスして最適な遅延時間を決定するものとして説明したが、これに限定されるものではない。第2の実施形態では、レシーバー回路が自律的に最適な遅延時間を決定する。
第1の実施形態では、CPUが、データ信号及び取込クロック信号のクロスポイントのずれを検出するものとして説明したが、これに限定されるものではない。
第3の実施形態では、取込クロック信号のクロスポイントのずれを検出すると、トランスミッター側で、取込クロック信号のクロスポイントのずれを調整するものとして説明したが、これに限定されるものではない。
上記のいずれかの実施形態におけるレシーバー回路が適用される通信システムが実装される表示モジュールは、例えば次のような電子機器に適用することができる。
Claims (13)
- 取込クロック信号に基づいて決められる複数の取込タイミングで、入力信号を取り込むレシーバー回路であって、
第1の状態又は第2の状態に変化する前記入力信号を、設定された遅延時間だけ遅延させて出力する遅延回路と、
前記遅延回路により遅延させた前記入力信号を各取込タイミングで取り込むラッチ回路と、
前記ラッチ回路に取り込まれたラッチ信号を検定するデータ検定回路と、
前記データ検定回路の検定結果に対応した検定結果値が設定されるデータ検定結果レジスターとを含み、
前記データ検定回路は、
各取込タイミングで前記ラッチ回路に取り込まれた前記ラッチ信号と期待値とを比較して、比較結果を出力することを特徴とするレシーバー回路。 - 請求項1において、
前記遅延回路において設定される異なる遅延時間毎に各取込タイミングで取り込まれたラッチ信号に対応したラッチデータが所与の第1のパターンと一致するように、前記検定結果値に基づいて前記遅延回路の遅延時間を調整する遅延値調整部を含むことを特徴とするレシーバー回路。 - 請求項1において、
各取込タイミングが、前記第1の状態又は前記第2の状態が連続する期間の中央となるように、前記検定結果値に基づいて前記遅延回路の遅延時間を調整する遅延値調整部を含むことを特徴とするレシーバー回路。 - 請求項1乃至3のいずれかにおいて、
前記遅延回路は、
前記遅延回路を構成する遅延素子の電流駆動能力及びその出力信号の信号経路の遅延素子数の少なくとも一方を変更することを特徴とするレシーバー回路。 - 請求項1乃至4のいずれかにおいて、
前記レシーバー回路の動作起動後、前記入力信号を用いた表示開始前、及び前記入力信号を用いた表示の帰線期間の少なくとも1つのタイミングで、前記データ検定回路が前記ラッチ信号の検定を行うことを特徴とするレシーバー回路。 - 請求項1乃至5のいずれかにおいて、
前記検定結果値に基づいて、前記取込タイミングの周期より前記第1の状態又は前記第2の状態が連続する期間が長いと判断されたとき、差動信号として入力される前記入力信号のクロスポイントのずれを検出する第1のクロスポイント検出部を含むことを特徴とするレシーバー回路。 - 請求項1乃至6のいずれかにおいて、
前記検定結果値に基づいて、前記取込クロック信号の立ち下がりエッジ、立ち上がりエッジ、及び立ち下がりエッジの順番で取り込んだときに前記第1の状態又は前記第2の状態が連続する期間と、前記取込クロック信号の立ち上がりエッジ、立ち下がりエッジ、及び立ち上がりエッジの順番で取り込んだときに前記第1の状態又は前記第2の状態が連続する期間とが異なると判断されたとき、差動信号として入力される前記取込クロック信号のクロスポイントのずれを検出する第2のクロスポイント検出部を含むことを特徴とするレシーバー回路。 - 請求項7において、
前記第2のクロスポイント検出部によって前記取込クロック信号のクロスポイントのずれが検出されたとき、前記取込クロック信号のクロスポイントを調整するクロスポイント調整部を含むことを特徴とするレシーバー回路。 - 請求項1乃至8のいずれか記載のレシーバー回路と、
前記入力信号を前記レシーバー回路に送信するトランスミッター回路とを含むことを特徴とする通信システム。 - 請求項6記載のレシーバー回路と、
前記入力信号を前記レシーバー回路に送信するトランスミッター回路とを含み、
前記トランスミッター回路は、
前記第1のクロスポイント検出部により前記入力信号のクロスポイントのずれが検出されたとき、前記入力信号のクロスポイントを調整することを特徴する通信システム。 - 請求項7記載のレシーバー回路と、
前記入力信号を前記レシーバー回路に送信するトランスミッター回路とを含み、
前記トランスミッター回路は、
前記第2のクロスポイント検出部によって前記取込クロック信号のクロスポイントのずれが検出されたとき、前記取込クロック信号のクロスポイントを調整することを特徴とする通信システム。 - 請求項9乃至11のいずれか記載の通信システムを含むことを特徴とする電子機器。
- 取込クロック信号に基づいて決められる複数の取込タイミングで入力信号を取り込むレシーバー回路の制御方法であって、
第1の状態又は第2の状態に変化する前記入力信号を、設定された遅延時間だけ遅延させて出力させる遅延制御ステップと、
前記遅延制御ステップにおいて遅延させた前記入力信号を各取込タイミングで取り込むラッチステップと、
前記ラッチステップにおいて取り込まれたラッチ信号を検定するデータ検定ステップと、
前記データ検定ステップの検定結果に基づいて、前記遅延時間を調整する遅延値調整ステップとを含み、
前記データ検定ステップにおいて、各取込タイミングで取り込まれた前記ラッチ信号と期待値とを比較することを特徴とするレシーバー回路の制御方法。
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