Transmitter, imaging system, and communication system
阅读说明:本技术 传输器、成像系统以及通信系统 (Transmitter, imaging system, and communication system ) 是由 高桥宏雄 松本英之 杉冈达也 林宏晓 于 2015-05-08 设计创作,主要内容包括:本公开涉及传输器、成像系统以及通信系统。一种传输器包括:表设定部分,被配置为基于一控制信号来生成查找表;传输控制电路,被配置为基于数据信号的转变模式和查找表来确定是否对数据信号执行加重,查找表表示数据信号的转变模式与表示是否执行加重的标记之间的关系;以及传输驱动器,被配置为基于由传输控制电路确定的结果而选择性执行加重以选择性增加三个传输信号的高频分量,以生成三个传输信号。(The present disclosure relates to a transmitter, an imaging system, and a communication system. A transmitter includes: a table setting section configured to generate a look-up table based on a control signal; a transmission control circuit configured to determine whether to perform emphasis on the data signal based on a transition pattern of the data signal and a lookup table indicating a relationship between the transition pattern of the data signal and a flag indicating whether to perform emphasis; and a transmission driver configured to selectively perform emphasis based on a result determined by the transmission control circuit to selectively increase high frequency components of the three transmission signals to generate the three transmission signals.)
1. A transmitter, comprising:
a table setting section configured to generate a look-up table based on a control signal;
a transmission control circuit configured to determine whether to perform an emphasis on a data signal based on a transition pattern of the data signal and the lookup table, the lookup table representing a relationship between the transition pattern of the data signal and a flag indicating whether to perform the emphasis; and
a transmission driver configured to selectively perform the emphasis based on a result determined by the transmission control circuit to selectively increase high frequency components of three transmission signals to generate the three transmission signals.
2. The transmitter of claim 1,
the data signal represents a series of transmission symbols, and
the transmission control circuit is configured to compare two consecutive transmission symbols and determine whether to perform the emphasizing based on a result of the comparison.
3. The transmitter of claim 1,
respective ones of the three transmission signals make transitions from one to another of a high voltage state, a low voltage state, and an intermediate voltage state, and
the transmission control circuit is configured to determine that the emphasis is to be performed on respective ones of the three transmission signals in some of the corresponding transitions.
4. The transmission unit of claim 1,
respective ones of the three transmission signals make transitions from one of a high voltage state, a low voltage state and an intermediate voltage state to another,
the transmission control circuit is configured to determine that the emphasis is to be performed on the respective transmission signal making the transition from the high voltage state or the intermediate voltage state to the low voltage state, and
the transmission control circuit is configured to determine that the emphasis is to be performed on the respective transmission signal making the transition from the low voltage state or the intermediate voltage state to the high voltage state.
5. The transmission unit of claim 4, wherein the transmission control circuit is configured to determine that the emphasis is to be performed on the respective transmission signal maintained in the high voltage state or the low voltage state.
6. The transmission unit of claim 4,
the transmission control circuit is configured to determine that the emphasis is not to be performed on the respective transmission signal making the transition from the high-voltage state or the low-voltage state to the intermediate-voltage state, and
the transmit control circuit is configured to determine that the emphasis is not to be performed on the respective transmit signal maintained in the intermediate voltage state.
7. The transmission unit of claim 1,
the three transmission signals are a first transmission signal, a second transmission signal and a third transmission signal,
respective ones of the first, second, and third transmission signals make transitions from one to another of a high voltage state, a low voltage state, and an intermediate voltage state, and
the transmission control circuit is configured to determine that the emphasis is to be performed on the second transmission signal and the third transmission signal when the first transmission signal makes a transition from the high-voltage state to the intermediate-voltage state, the second transmission signal makes a transition from the low-voltage state to the high-voltage state, and the third transmission signal makes a transition from the intermediate-voltage state to the low-voltage state.
8. The transmission unit of claim 1,
the three transmission signals are a first transmission signal, a second transmission signal and a third transmission signal,
respective ones of the first, second, and third transmission signals make transitions from one to another of a high voltage state, a low voltage state, and an intermediate voltage state, and
the transmission control circuit is configured to determine that the emphasis is to be performed when there is a change between respective polarities of a first difference signal between the first transmission signal and the second transmission signal, a second difference signal between the second transmission signal and the third transmission signal, and a third difference signal between the first transmission signal and the third transmission signal.
9. The transmitter of claim 1, wherein the transmit driver is configured to selectively perform the emphasis to selectively reduce low frequency components of the three transmit signals.
10. The transmitter of claim 9,
respective ones of the three transmit signals make transitions from a first voltage state of a plurality of voltage states to a second voltage state of the plurality of voltage states, and
the transmit control circuit is configured to determine that the emphasizing is to be performed on respective ones of the three transmit signals that are maintained in the plurality of voltage states.
11. The transmitter of claim 9,
respective ones of the three transmission signals make transitions from one to another of a high voltage state, a low voltage state, and an intermediate voltage state, and
the transmission control circuit is configured to determine that the emphasis is to be performed on the respective transmission signal maintained in the high voltage state or the low voltage state.
12. The transmitter of claim 11, wherein the transmission control circuit is configured to determine that the emphasis is not to be performed on the respective transmission signal maintained in the intermediate voltage state.
13. The transmitter of claim 1,
the transmission control circuit is configured to individually determine whether to perform the emphasizing on respective ones of the three transmission signals.
14. The transmitter of claim 1,
the transmission control circuit is configured to collectively determine whether to perform the emphasizing on respective ones of the three transmission signals.
15. An imaging system, comprising:
a CMOS image sensor configured to generate the data signal; and
the transmitter of claim 1.
16. A communication system, comprising:
a transmitter according to claim 1; and
a receiver configured to receive a transmission signal from the transmitter,
wherein the receiver comprises:
a receiving section configured to receive the transmission signal; and
a control signal generation section configured to generate the control signal based on a comparison of a pattern of the transmission signal received by the reception section with a predetermined pattern for calibration in a calibration mode,
wherein the control signal is sent to the table setting portion of the transmitter to control the table generating portion to generate the look-up table.
Technical Field
The present disclosure relates to a transmission unit configured to transmit a signal, a reception unit configured to receive a signal, and a communication system configured to transmit and receive a signal.
Background
Recently, with improvements in functionality and versatility of electronic devices, the electronic devices include various apparatuses such as semiconductor chips, sensors, and display apparatuses. A large amount of data is exchanged in these apparatuses, and the amount of data has increased as the functionality and versatility of electronic devices have improved. Therefore, data is often exchanged using, for example, a high-speed interface capable of transmitting and receiving data at several Gbps.
To improve communication performance in high speed interfaces, emphasis (pre-emphasis or de-emphasis) and equalizers are often used. The pre-emphasis is used to pre-emphasize a high-frequency component of a signal during transmission (for example, refer to PTL 1), and the de-emphasis is used to pre-reduce a low-frequency component of the signal during transmission. Further, the equalizer is configured to increase a high frequency component of the signal during reception. Therefore, in the communication system, the influence of signal attenuation allowed through the transmission path is reduced, and improvement in communication performance is allowed to be achieved.
CITATION LIST
Patent document
[ PTL 1] Japanese unexamined patent application publication No. 2011-
Disclosure of Invention
Technical problem
As described above, in the communication system, improvement in communication performance is desired, and further improvement in communication performance is desired.
It is desirable to provide a transmission unit, a reception unit, and a communication system capable of improving communication performance.
Solution to the problem
According to an embodiment of the present disclosure, there is provided a transmitter including: a transmission control circuit configured to determine whether to perform an emphasis on the data signal based on a transition pattern of the data signal; and a transmission driver configured to selectively perform the emphasis based on a result determined by the transmission control circuit to generate at least one transmission signal.
According to an embodiment of the present disclosure, there is provided a receiver including: a first receiving circuit configured to receive at least one transmission signal and output a first output signal; an equalizer configured to perform equalization on at least one transmission signal; a second receiving circuit configured to receive the at least one equalized transmission signal from the equalizer and output a second output signal; and a selection control circuit configured to select between the first output signal and the second output signal based on a transition mode of the at least one transmission signal.
According to an embodiment of the present disclosure, there is provided a receiver including: an equalizer configured to perform equalization on at least one transmission signal; and a receiving circuit configured to receive the equalized at least one transmission signal from the equalizer and output an output signal, wherein the at least one transmission signal is one of three transmission signals, and the respective one of the three transmission signals makes a transition from one of a high voltage state, a low voltage state, and an intermediate voltage state to another, and wherein the equalizer is configured to selectively equalize the respective one of the three transmission signals based on a transmission mode of the at least one transition signal
According to an embodiment of the present disclosure, there is provided a communication system including: a transmitter, the transmitter comprising: a transmission control circuit configured to determine whether to perform pre-emphasis on the data signal based on a transition pattern of the data signal, and a transmission driver configured to selectively perform pre-emphasis based on a result determined by the transmission control circuit to generate at least one transmission signal; and a selection control circuit configured to select between the first output signal and the second output signal based on a transition mode of the at least one transmission signal.
According to an embodiment of the present disclosure, there is provided a communication system including: a transmitter; and a receiver, the receiver comprising: a first receiving circuit configured to receive at least one transmission signal and output a first output signal; an equalizer configured to perform post-emphasis on the at least one transmission signal to generate at least one equalized transmission signal; a second receiving circuit configured to receive the at least one equalized transmission signal from the equalizer and output a second output signal; and a selection control circuit configured to select between the first output signal and the second output signal based on a transition mode of the at least one transmission signal.
The invention has the advantages of
In the first transmission unit, the first communication system, and the second communication system according to the embodiments of the present disclosure, the emphasis is selectively performed; thereby, communication performance is improved.
In the second transmission unit according to the embodiment of the present disclosure, two transmission symbols adjacent to each other on a time axis in the data signal are compared with each other, and the voltage level of the transmission signal is corrected based on the comparison result; thereby, communication performance is improved.
In the receiving unit and the second communication system according to the embodiments of the present disclosure, the first output signal or the second output signal is selected based on the transition pattern of the one or more transmission signals received by the first receiving section or the second receiving section; thereby, communication performance is improved.
It should be noted that the effects of the embodiments of the present disclosure are not limited to the effects described herein, and may include any effects described in the present specification.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the technology claimed.
Drawings
Fig. 1 is a block diagram showing a configuration example of a communication system according to an embodiment of the present disclosure.
Fig. 2 is an explanatory diagram showing voltage states of signals transmitted and received in the communication system shown in fig. 1.
Fig. 3 is a block diagram showing a configuration example of a transmission unit according to the first embodiment.
Fig. 4 is an explanatory diagram showing transitions of symbols transmitted and received in the communication system shown in fig. 1.
Fig. 5 is a circuit diagram showing a configuration example of the transmission section shown in fig. 3.
Fig. 6 is a block diagram showing a configuration example of a receiving unit according to the first embodiment.
Fig. 7 is an explanatory diagram showing an example of a receiving operation of the receiving unit shown in fig. 6.
Fig. 8 is a table showing an example of the operation of the signal generating section shown in fig. 3.
Fig. 9A is a waveform diagram illustrating an example of the operation of the transmission unit shown in fig. 3.
Fig. 9B is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 9C is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 9D is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 9E is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 10A is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 10B is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 10C is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 10D is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 10E is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 11A is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 11B is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 11C is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 11D is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 11E is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 12A is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 12B is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 12C is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 12D is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 12E is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 13 is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 14 is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 15 is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 16 is a waveform diagram illustrating another operation example of the transmission unit shown in fig. 3.
Fig. 17 is a waveform diagram showing an example of the operation of the transmission unit according to the comparative example.
Fig. 18 is a waveform diagram showing another operation example of the transmission unit according to the comparative example.
Fig. 19 is a table showing an example of operation of the signal generating section according to the modification of the first embodiment.
Fig. 20 is a block diagram showing a configuration example of a transmission unit according to another modification of the first embodiment.
Fig. 21 is a table showing an example of operation of the signal generating section shown in fig. 20.
Fig. 22 is a block diagram showing a configuration example of a signal generating section according to another modification of the first embodiment.
Fig. 23 is a table showing an example of operation of a signal generating section according to another modification of the first embodiment.
Fig. 24A is a waveform diagram showing an example of the operation of the transmission unit according to another modification of the first embodiment.
Fig. 24B is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 24C is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 24D is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 24E is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 25A is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 25B is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 25C is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 25D is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 25E is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 26 is a block diagram showing a configuration example of a communication system according to another modification of the first embodiment.
Fig. 27 is a block diagram showing a configuration example of the receiving unit shown in fig. 26.
Fig. 28 is a block diagram showing a configuration example of the transmission unit shown in fig. 26.
Fig. 29 is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 30 is a waveform diagram showing another operation example of the transmission unit according to another modification of the first embodiment.
Fig. 31 is a block diagram showing a configuration example of a transmission unit according to the second embodiment.
Fig. 32 is a circuit diagram showing a configuration example of the transmission section shown in fig. 31.
Fig. 33 is a block diagram showing a configuration example of a receiving unit according to the second embodiment.
Fig. 34 is a waveform diagram illustrating an example of the operation of the receiving unit shown in fig. 33.
Fig. 35 is a waveform diagram illustrating another operation example of the receiving unit shown in fig. 33.
Fig. 36 is a waveform diagram illustrating another operation example of the receiving unit shown in fig. 33.
Fig. 37 is a waveform diagram illustrating another operation example of the receiving unit shown in fig. 33.
Fig. 38 is a perspective view showing an appearance of a smartphone to which the communication system according to the embodiment is applied.
Fig. 39 is a block diagram showing a configuration example of an application processor to which the communication system according to the embodiment is applied.
Fig. 40 is a block diagram showing a configuration example of an image sensor to which the communication system according to the embodiment is applied.
Detailed Description
Some embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that description will be made in the following order.
1. First embodiment (example using weight)
2. Second embodiment (example using equalizer)
3. Application example
(1. first embodiment)
Configuration example
Fig. 1 shows a configuration example of a communication system to which a transmission unit according to the first embodiment is applied. The
The
Fig. 2 shows the voltage states of the signals SIGA, SIGB, and SIGC. The
Fig. 3 shows a configuration example of the
The
Fig. 4 shows the operation of the
Signal TxF allows symbols to make transitions between "+ x" and "-x", between "+ y" and "-y", or between "+ z" and "-z". More specifically, in the case where the signal TxF is "1", the symbol makes a transition (for example, from "+ x" to "-x") to change its polarity, and in the case where the signal TxF is "0", such a transition is not performed.
Where signal TxF is "0", signals TxR and TxP allow the symbols to make transitions other than between "+ x" and "-x", transitions between "+ y" and "-y", and transitions between "+ z" and "-z". More specifically, in the case where the signal TxR is "1" and the signal TxP is "0", in fig. 4, the symbol is shifted in the clockwise direction (for example, from "+ x" to "+ y") while maintaining the polarity of the symbol, and in the case where the signal TxR is "1" and the signal TxP is "1", in fig. 4, the symbol is shifted in the clockwise direction (for example, from "+ x" to "-y") while changing the polarity of the symbol. Further, in the case where the signal TxR is "0" and the signal TxP is "0", in fig. 4, the symbol is shifted in the counterclockwise direction (for example, from "+ x" to "+ z") while maintaining the polarity of the symbol, and in the case where the signal TxR is "0" and the signal TxP is "1", in fig. 4, the symbol is shifted in the counterclockwise direction (for example, from "+ x" to "-z") while changing the polarity of the symbol.
Therefore, in the
Further, the
With this configuration, for example, the
The
The flip-
The flip-
The
Fig. 5 shows a configuration example of the
The
The
With this configuration, as shown in fig. 2, the
The
The
For example, in the case where the signal SIGA is set to the voltage state SH, the
The
The
With this configuration, the
It should be noted that the
Fig. 6 shows a configuration example of the receiving
The
Each of the
With this configuration,
Fig. 7 shows an example of the operation of the
The
The flip-
The flip-
The
The signals S1 and S2 correspond to specific examples of "data signals" in the embodiments of the present disclosure. The signals SIGA, SIGB, and SIGC correspond to specific examples of "one or more transmission signals" in the embodiments of the present disclosure. The
Operation and function
Next, the operation and function of the
(summary of the entire operation)
First, referring to fig. 1 and the like, a summary of the overall operation of the
In the receiving
(concrete operation)
The
Fig. 8 shows an example of the LUT19, and shows the relationship among the current symbol CS, signals TxF, TxR, and TxP, and signals EA, EB, and EC. Note that, for convenience of description, the next symbol NS is also shown in fig. 8.
The
Fig. 9A to 9E and fig. 10A to 10E show operations in the case where a symbol makes a transition from "+ x" to a symbol other than "+ x", where fig. 9A to 9E show waveforms of signals SIGA, SIGB, and SIGC, and fig. 10A to 10E show waveforms of differences AB, BC, and CA. Fig. 9A and 10A show a transition from "+ x" to "-x", fig. 9B and 10B show a transition from "+ x" to "+ y", fig. 9C and 10C show a transition from "+ x" to "-y", fig. 9D and 10D show a transition from "+ x" to "+ z", and fig. 9E and 10E show a transition from "+ x" to "-z". In fig. 9A to 9E and fig. 10A to 10E, a thin line indicates a case where pre-emphasis is not performed, and a thick line indicates a case where pre-emphasis is performed. In this example, the lengths of the
In the case where the symbol makes a transition from "+ x" to "-x", the
In the case where the symbol makes a transition from "+ x" to "+ y", the
In the case where the symbol makes a transition from "+ x" to "-y", the
In the case where the symbol makes a transition from "+ x" to "+ z", the
In the case where the symbol makes a transition from "+ x" to "-z", the
Fig. 11A to 11E and fig. 12A to 12E show operations in the case where symbols make transitions from "-x" to symbols other than "-x", where fig. 11A to 11E show waveforms of signals SIGA, SIGB, and SIGC, and fig. 12A to 12E show waveforms of differences AB, BC, and CA. Fig. 11A and 12A show a transition from "-x" to "+ x", fig. 11B and 12B show a transition from "-x" to "+ y", fig. 11C and 12C show a transition from "-x" to "-y", fig. 11D and 12D show a transition from "-x" to "+ z", and fig. 11E and 12E show a transition from "-x" to "-z".
In the case where the symbol makes a transition from "-x" to "+ x", the
In the case where the symbol makes a transition from "-x" to "+ y", the
In the case where the symbol makes a transition from "-x" to "-y", the
In the case where the symbol makes a transition from "-x" to "+ z", the
In the case where the symbol makes a transition from "-x" to "-z", the
Therefore, the
The
Next, some of the transitions of the symbols will be described in more detail as examples.
First, a case where a symbol makes a transition from "+ x" to "+ y" will be described below. In this case, as shown in fig. 9B, the signal SIGA is converted from the voltage state SH (e.g., the high-level voltage VH) to the voltage state SM (e.g., the middle-level voltage VM), the signal SIGB is converted from the voltage state SL (e.g., the low-level voltage VL) to the voltage state SH, and the signal SIGC is converted from the voltage state SM to the voltage state SL. In this case, as shown in fig. 10B, for example, the transition time of the difference AB increases. The first reason for the increase in the transition time of the difference AB is that the signal SIGA transitions to the mid-level voltage VM. More specifically, when the signal SIGA is converted into the middle-level voltage VM, the
This may also be caused, for example, in the case where the symbol makes a transition from "+ x" to "+ z" (refer to fig. 9D and 10D). In this case, as shown in fig. 9D, the signal SIGA is switched from the voltage state SH (e.g., the high-level voltage VH) to the voltage state SL (e.g., the low-level voltage VL), the signal SIGB is switched from the voltage state SL to the voltage state SM (e.g., the middle-level voltage VM), and the signal SIGC is switched from the voltage state SM to the voltage state SH. This may be caused when the symbol is shifted from "-x" to "-y" (see fig. 11C and 12C), when the symbol is shifted from "-x" to "-z" (see fig. 11E and 12E), or the like.
Fig. 13 and 14 show operations in the case where the symbol makes a transition from "+ x" to "+ y", where parts (a) to (C) in fig. 13 show the waveforms of the signals SIGA, SIGB, and SIGC, respectively, and parts (a) to (C) in fig. 14 show the waveforms of the differences AB, BC, and CA, respectively. Fig. 13 corresponds to fig. 9B, and fig. 14 corresponds to fig. 10B. In fig. 14, an eye mask EM indicating a reference of an eye opening (eye open) is also shown.
When the symbol makes a transition from "+ x" to "+ y", the
Next, a case where the symbol makes a transition from "+ x" to "-z" will be described below.
Fig. 15 and 16 show operations in the case where the symbol makes a transition from "+ x" to "-z", where parts (a) to (C) in fig. 15 show the waveforms of the signals SIGA, SIGB, and SIGC, respectively, and parts (a) to (C) in fig. 16 show the waveforms of the differences AB, BC, and CA, respectively. Fig. 15 corresponds to fig. 9E, and fig. 16 corresponds to fig. 10E.
When the symbol makes a transition from "+ x" to "-z", as shown in fig. 15, the
Comparative example
Hereinafter, a case where pre-emphasis is performed on a signal whose voltage state is converted among the signals SIGA to SIGC and pre-emphasis is not performed on a signal whose voltage state is not converted among the signals SIGA to SIGC will be considered as a comparative example.
Fig. 17 and 18 show operations in the case where the symbol makes a transition from "+ x" to "-z", where parts (a) to (C) in fig. 17 show the waveforms of the signals SIGA, SIGB, and SIGC, respectively, and parts (a) to (C) in fig. 18 show the waveforms of the differences AB, BC, and CA, respectively.
When the sign makes a transition from "+ x" to "-z", the transmission unit 10R according to the comparative example emphasizes the transition of the signal SIGB by the voltage increment V and emphasizes the transition of the signal SIGC by the voltage increment V, as shown in fig. 17. In other words, pre-emphasis is performed on the voltage state-converted signals SIGB and SIGC, and pre-emphasis is not performed on the voltage state-unchanged signal SIGA. At this time, the difference AB is as shown in part (a) in fig. 18, and the eye can be narrowed.
On the other hand, in the
Therefore, in the
Effect
As described above, in this embodiment, pre-emphasis is selectively performed on the signals SIGA to SIGC; thus, communication quality improvement is allowed.
Modification 1-1
In the above-described embodiment, as shown in fig. 8, pre-emphasis is performed on one or more of the signals SIGA, SIGB, and SIGC in any of the transitions from one of the six symbols to another; however, the present disclosure is not limited thereto. Alternatively, for example, pre-emphasis may be performed only in some of the transitions from one of the six symbols to the other. The communication system 1A according to this modification will be described in detail below.
Fig. 19 shows an example of the LUT 19A according to this modification. The signal generation section 11A according to this modification generates signals EA, EB, and EC based on the LUT 19A. For example, all signals EA, EB, and EC may change to "0" in the case where a symbol makes a transition from "+ x" to "-x", in the case where a symbol makes a transition from "+ x" to "-y", and in the case where a symbol makes a transition from "+ x" to "-z". In other words, in these cases, the
It should be noted that the transition of performing pre-emphasis in the transition from one to another of the six symbols is not limited to the example in fig. 19, and any one of the transitions may be arbitrarily set as the transition of performing pre-emphasis.
In the above embodiment, the
Fig. 20 shows a configuration example of the
Fig. 21 shows an example of the LUT19B according to this modification. For example, the
It should be noted that the transition of performing pre-emphasis in the transition from one to another of the six symbols is not limited to the example in fig. 21, and any one of the transitions may be arbitrarily set as the transition of performing pre-emphasis. For example, pre-emphasis may be performed only if two of the differences AB, BC, and CA transition across "0". Further, pre-emphasis may be performed only if all of the differences AB, BC, and CA transition across "0".
The
Fig. 22 shows a configuration example of a part of the generation signal EE in the signal generation section 11C according to this modification. In this example, the signal generating section 11C generates the signal EE based on the current symbol CS, the next symbol NS, and the
The
The
The logic circuit 120 is configured to generate a signal based on the output signal of the
The logic circuit 120 includes AND circuits 121 to 125. The output signal of the comparing
Therefore, as shown in fig. 21, the logic circuit 120 is configured to allow the AND circuit 122 to output "1" in the case where the symbol CS ═ x "AND the symbol NS ═ y", AND to allow the AND circuit 124 to output "1" in the case where the symbol CS ═ x "AND the symbol NS ═ z".
Also, the logic circuit 130 is configured to generate a signal based on the output signal of the comparison section 102, the output signals of the
The OR circuit 180 is configured to determine a logical OR of the output signals of all the AND circuits in the logic circuits 120, 130, 140, 150, 160, AND 170.
Even in such a configuration, it is allowed to obtain effects similar to those in the
In the above embodiment, the
Fig. 23 shows an example of the LUT 19D according to this modification. Signal generation portion 11D of transmission unit 10D is configured to generate signals EA, EB, and EC based on current symbol CS and signals TxF, TxR, and TxP with reference to LUT 19D. Then, the transmission section 20D of the transmission unit 10D performs de-emphasis on the signals SIGA, SIGB, and SIGC based on the signals EA2, EB2, and
Fig. 24A to 24E and fig. 25A to 25E show operations in the case where a symbol makes a transition from "+ x" to a symbol other than "+ x", where fig. 24A to 24E show waveforms of signals SIGA, SIGB, and SIGC, and fig. 25A to 25E show waveforms of differences AB, BC, and CA. In this example, the lengths of the
In the case where the symbol makes a transition from "+ x" to "-x", the signal generating section 11D changes the signals EA, EB, and EC to "0", and "0", respectively, as shown in fig. 23. Therefore, as shown in fig. 24A, the transmission section 20D does not perform de-emphasis on the signals SIGA to SIGC. Therefore, the differences AB, BC, and CA have waveforms as shown in fig. 25A.
In the case where the symbol makes a transition from "+ x" to "+ y", the signal generating section 11D changes the signals EA, EB, and EC to "0", and "0", respectively, as shown in fig. 23. Therefore, as shown in fig. 24B, the transmission section 20D does not perform de-emphasis on the signals SIGA to SIGC. Therefore, the differences AB, BC, and CA have waveforms as shown in fig. 25B.
In the case where the symbol makes a transition from "+ x" to "-y", the signal generating section 11D changes the signals EA, EB, and EC to "0", "1", and "0", respectively, as shown in fig. 23. Therefore, as shown in fig. 24C, the transmission section 20D performs de-emphasis on the signal SIGB to convert the signal SIGB from the low-level voltage VL to a voltage higher than the low-level voltage VL. At this time, the transmission section 20D does not perform de-emphasis on the signals SIGA and SIGC. Therefore, the differences AB, BC, and CA have waveforms as shown in fig. 25C. In other words, the difference CA across the "0" transition is not affected by de-emphasis.
In the case where the symbol makes a transition from "+ x" to "+ z", the signal generating section 11D changes the signals EA, EB, and EC to "0", and "0", respectively, as shown in fig. 23. Therefore, as shown in fig. 24D, the transmission section 20D does not perform de-emphasis on the signals SIGA to SIGC. Therefore, the differences AB, BC, and CA have waveforms as shown in fig. 25D.
In the case where the symbol makes a transition from "+ x" to "-z", the signal generating section 11D changes the signals EA, EB, and EC to "1", "0", and "0", respectively, as shown in fig. 23. Therefore, as shown in fig. 24E, the transmission section 20D performs de-emphasis on the signal SIGA so as to convert the signal SIGA from the high-level voltage VH to a voltage lower than the high-level voltage VH. At this time, the transmission section 20D does not perform de-emphasis on the signals SIGA and SIGB. Therefore, the differences AB, BC, and CA have waveforms as shown in fig. 25E. In other words, the difference BC across the "0" transition is not affected by de-emphasis.
Therefore, the transmission unit 10D performs de-emphasis so as not to affect the difference value converted across "0" among the difference values AB, BC, and CA. Even in such a configuration, it is allowed to obtain effects similar to those of the
It should be noted that the transition of performing de-emphasis in the transition from one of the six symbols to another is not limited to the example in fig. 23, and any one of the transitions can be arbitrarily set as the transition of performing de-emphasis.
In the above-described embodiment, the
Fig. 26 shows a configuration example of the communication system 1E. The communication system 1E includes a receiving
Fig. 27 shows a configuration example of the receiving
Fig. 28 shows a configuration example of the
The signal DET corresponds to a specific example of the "control signal" in the embodiment of the present disclosure. The
In the communication system 1E, in the calibration mode, for example, the setting of the pre-emphasis may be changed to reduce the bit error rate. More specifically, first, the
In the above embodiment, LUT19 indicating the relationship among current symbol CS, signals TxF, TxR, and TxP, and signals EA, EB, and EC is used; however, the present disclosure is not limited thereto. Alternatively, for example, an LUT indicating the relationship among the next symbol NS, the signals TxF, TxR, and TxP, and the signals EA, EB, and EC may be used, or for example, an LUT indicating the relationship among the current symbol CS, the next symbol NS, and the signals EA, EB, and EC may be used.
In the above embodiment, as shown in fig. 13 and the like, pre-emphasis is performed throughout a period in which one symbol is transmitted; however, the present disclosure is not limited thereto. Alternatively, for example, as shown in fig. 29 and 30, pre-emphasis may be performed only at a predetermined period after the transition of the signals SIGA, SIGB, and SIGC. Fig. 29 and 30 show a case where the symbol makes a transition from "+ x" to "+ y". As shown in fig. 29, the
Other modifications
Furthermore, two or more of these variations may be combined.
(2. second embodiment)
Next, a
As shown in fig. 1, the
Fig. 31 shows a configuration example of the
Fig. 32 shows a configuration example of the
Fig. 33 shows a configuration example of the receiving
The
The receiving
The receiving
Like the
The
The
The
The
The receiving
Next, some of the transitions of the symbols will be described in detail as examples.
Fig. 34 and 35 show operations in the case where the symbol makes a transition from "+ x" to "+ y", where parts (a) to (C) in fig. 34 show the waveforms of the equalized signals SIGA2, SIGB2, and SIGC2, respectively, and parts (a) to (C) in fig. 35 show the difference AB2 between the signals SIGA2 and SIGB2, the difference BC2 between the signals SIGB2 and SIGC2, and the difference CA2 between the signals SIGC2 and SIGA2, respectively. In this example, the lengths of the
When the symbol makes a transition from "+ x" to "+ y", as shown in fig. 34, the
Fig. 36 and 37 show operations in the case where the symbol makes a transition from "+ x" to "-z", where parts (a) to (C) in fig. 36 show waveforms of the equalization signal SIGA2, SIGB2, and SIGC2, respectively, and parts (a) to (C) in fig. 37 show waveforms of the difference values AB2, BC2, and CA2, respectively.
When the symbol makes a transition from "+ x" to "-z",
Thus, in the
As described above, in this embodiment, equalization is selectively performed on the signals SIGA to SIGC; thus, communication quality improvement is allowed.
Modification 2-1
In the above embodiment, the
Modification 2-2
Further, the communication system may be configured by a combination of the
(3. application example)
Next, application examples of the communication system described in the above embodiment and the above modification will be described below.
Fig. 38 shows an appearance of a smartphone 300 (multifunction cellular phone) to which any of the communication systems according to the above-described embodiments and the like is applied. The smartphone 300 includes various devices, and any one of the communication systems according to the above-described embodiments and the like is applied to a communication system configured to exchange data between these devices.
Fig. 39 shows 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 section 312, a power supply control section 313, an external interface 314, a GPU (graphics processing unit) 315, a media processing section 316, a display control section 317, and a MIPI (mobile industry processor interface) interface 318. In this example, the CPU 311, the memory control section 312, the power supply control section 313, the external interface 314, the GPU 315, the media processing section 316, and the display control section 317 are connected to a system bus 319, and they exchange data therebetween through the system bus 319.
The CPU 311 is configured to process various information processed in the smartphone 300 according to a program. The memory control section 312 is configured to control the memory 501 used when the CPU 311 executes information processing. The power supply control portion 313 is configured to control power supply of the smartphone 300.
The external interface 314 is an interface for communicating with an external device, and in this example, is connected to the wireless communication section 502 and the image sensor 503. The wireless communication section 502 is configured to perform wireless communication with a base station of a cellular phone, and may include, for example, a baseband section, an RF (radio frequency) front end section, and the like. The image sensor 503 is configured to acquire an image, and may include, for example, a CMOS sensor or the like.
The GPU 315 is configured to perform image processing. The media processing section 316 is configured to process information such as sound, text, and graphics. Display control section 317 is configured to control display 504 through MIPI interface 318. MIPI interface 318 is configured to transmit image signals to display 504. As the image signal, for example, a signal in YUV format, RGB format, or the like can be used. The communication system according to any of the above-described embodiments and the like is applied to a communication system between the MIPI interface 318 and the display 504.
Fig. 40 shows a configuration example of the image sensor 410. The image sensor 410 includes a sensor portion 411, an ISP (image signal processor) 412, a JPEG (joint photographic experts group) encoder 413, a CPU414, a RAM (random access memory) 415, a ROM (read only memory) 416, a power supply control portion 417, I2A C (inter integrated circuit) interface 418, and a MIPI interface 419. In this example, respective blocks of these components are connected to the system bus 420, and are allowed to exchange data therebetween through the system bus 420.
The sensor portion 411 is configured to acquire an image, and may be configured by, for example, a CMOS sensor. The ISP412 is configured to perform predetermined processing on the image acquired by the sensor portion 411. The JPEG encoder 413 is configured to encode the image processed by the ISP412 to generate a JPEG format image. The CPU414 is configured to control the respective blocks of the image sensor 410 according to a program. The RAM 415 is a memory used when the CPU414 executes information processing. ROM 416 is configured to hold programs to be executed in CPU414And (4) sequencing. The power supply control section 417 is configured to control power supply of the image sensor 410. I is2The C-interface 418 is configured to receive control signals from the application processor 310. Further, although not shown, the image sensor 410 is configured to receive a clock signal in addition to the control signal from the application processor 310. More specifically, the image sensor 410 is allowed to operate based on clock signals of various frequencies. MIPI interface 419 is configured to transmit the image signal to application processor 310. As the image signal, for example, a signal in YUV format, RGB format, or the like can be used. The communication system according to any of the above-described embodiments and the like is applied to a communication system between the MIPI interface 419 and the application processor 310.
Although the present technology has been described with reference to the embodiments, the modifications thereof, and the application examples to the electronic device, the present technology is not limited thereto, and various modifications are possible.
For example, in the respective above-described embodiments, each of the signals SIGA, SIGB, and SIGC makes a transition from one to another of the three voltage states SH, SM, and SL; however, the number of voltage states is not limited thereto. Alternatively, for example, the transition may occur between two voltage states, or from one to the other of four or more voltage states.
Further, in the respective above-described embodiments, communication is performed using three signals SIGA, SIGB, and SIGC; however, the number of signals is not limited thereto. Alternatively, for example, communication may be performed using two signals or four or more signals.
It should be noted that the effects described in this description are merely examples; therefore, the effect in the present technology is not limited thereto, and the present technology may have other effects.
Note that the present technology is allowed to have the following configuration.
(1) A transmission unit, comprising:
a transmission section configured to selectively perform emphasis based on a data signal to generate one or more transmission signals; and
a control section configured to determine whether to perform emphasis to control the transmission section based on a transition pattern of the data signal.
(2) The transmission unit according to (1), wherein,
the data signal represents a series of transmission symbols, and
the control section compares two consecutive transmission symbols with each other, and determines whether to perform emphasis based on the comparison result.
(3) The transmission unit according to (1) to (2), wherein the control section includes a look-up table indicating a relationship between the transition patterns and a flag indicating whether to perform the emphasis, and determines whether to perform the emphasis based on the look-up table.
(4) The transmission unit of (3), wherein the look-up table is configured to be programmable.
(5) The transmission unit according to any one of (1) to (4), wherein the transmission section performs emphasis to increase a high-frequency component of the transmission signal.
(6) The transmission unit according to (5), wherein,
each transfer signal makes a transition from one to another of a plurality of voltage states, an
The control section determines that emphasis should be performed on the transmission signal in some of the transitions from one of the plurality of voltage states to another.
(7) The transmission unit according to (5) or (6), wherein,
the transmission section generates three transmission signals,
each of the transmission signals making a transition from one of the first voltage state, the second voltage state, and a third voltage state to another, the third voltage state having a voltage level between the voltage level of the first voltage state and the voltage level of the second voltage state,
the control section determines that emphasis should be performed on a transmission signal that makes a transition from the first voltage state and the third voltage state to the second voltage state among the three transmission signals, and
the control section determines that emphasis should be performed on a transmission signal that makes a transition from the second voltage state and the third voltage state to the first voltage state among the three transmission signals.
(8) The transmission unit according to (7), wherein the control section determines that emphasis should be performed on the transmission signal maintained in the first voltage state and the second voltage state among the three transmission signals.
(9) The transmission unit according to (7), wherein,
the control section determines that emphasis should not be performed on a transmission signal that makes a transition from the first voltage state and the second voltage state to the third voltage state among the three transmission signals, and
the control section determines that emphasis should not be performed on the transmission signal maintained in the third voltage state among the three transmission signals.
(10) The transmission unit according to (5) or (6), wherein,
the transmission section generates a first transmission signal, a second transmission signal and a third transmission signal,
each of the transmission signals makes a transition from one of the first voltage state, the second voltage state, and a third voltage state to another, the third voltage state having a voltage level between that of the first voltage state and that of the second voltage state, and
the control section determines that emphasis should be performed on the second transmission signal and the third transmission signal when the first transmission signal makes a transition from the first voltage state to the third voltage state, the second transmission signal makes a transition from the second voltage state to the first voltage state, and the third transmission signal makes a transition from the third voltage state to the second voltage state.
(11) The transmission unit according to (5) or (6), wherein,
the transmission section generates a first transmission signal, a second transmission signal and a third transmission signal,
each of the transmission signals makes a transition from one of the first voltage state, the second voltage state, and a third voltage state to another, the third voltage state having a voltage level between that of the first voltage state and that of the second voltage state, and
the control section determines that emphasis should be performed when the polarity of a difference signal between the first transmission signal and the second transmission signal, a difference signal between the second transmission signal and the third transmission signal, and a difference signal between the first transmission signal and the third transmission signal changes.
(12) The transmission unit according to any one of (1) to (4), wherein the transmission section performs emphasis to reduce a low-frequency component of the transmission signal.
(13) The transmission unit according to (12), wherein,
each transfer signal makes a transition from one to another of a plurality of voltage states, an
The control section determines that emphasis should be performed on each transmission signal while the transmission signal remains in some of the plurality of voltage states.
(14) The transmission unit according to (12) or (13), wherein,
the transmission section generates three transmission signals,
each of the transmission signals makes a transition from one of the first voltage state, the second voltage state, and a third voltage state to another, the third voltage state having a voltage level between that of the first voltage state and that of the second voltage state, and
the control section determines that emphasis should be performed on a transmission signal maintained in the first voltage state and the second voltage state among the three transmission signals.
(15) The transmission unit according to (14), wherein the control section determines that emphasis should not be performed on the transmission signal maintained in the third voltage state among the three transmission signals.
(16) The transmission unit according to any one of (1) to (15), wherein,
the transmission section generates a plurality of transmission signals, and
the control section individually determines whether or not to perform emphasis on each of the plurality of transmission signals.
(17) The transmission unit according to any one of (1) to (15), wherein,
the transmission section generates a plurality of transmission signals, and
the control section collectively determines whether or not to perform emphasis on the plurality of transmission signals.
(18) A transmission unit, comprising:
a transmission section configured to generate one or more transmission signals based on a data signal representing a series of transmission symbols and correct a voltage level of each transmission signal; and
a control section configured to compare two transmission symbols adjacent to each other on a time axis in the data signal with each other, and control the transmission section to correct the voltage level based on a comparison result.
(19) A receiving unit, comprising:
a first receiving section configured to receive one or more transmission signals;
an equalizer configured to perform equalization on one transmission signal or each of a plurality of transmission signals;
a second receiving section configured to receive the equalized one or more transmission signals; and
a selection control section configured to select the first output signal of the first receiving section or the second output signal of the second receiving section based on a transition pattern of one or more transmission signals received by the first receiving section or the second receiving section.
(20) The receiving unit according to (19), wherein the selection control section determines a series of voltage states in the one or more transmission signals, and compares two voltage states adjacent to each other on a time axis with each other, and selects the first output signal or the second output signal based on a result of the comparison.
(21) The receiving unit according to (19) or (20), wherein the control section includes a look-up table indicating a relationship between the transition patterns and a flag indicating whether equalization is performed, and selects the first output signal or the second output signal based on the look-up table.
(22) The receiving unit according to any one of (19) to (21), wherein the equalizer performs equalization to increase a high-frequency component of the transmission signal.
(23) The receiving unit according to any one of (19) to (22),
the one or more transmission signals are a plurality of transmission signals as three transmission signals, and
each of the three transmission signals makes a transition from one of the first voltage state, the second voltage state, and a third voltage state to another, the third voltage state having a voltage level between the voltage level of the first voltage state and the voltage level of the second voltage state.
(24) A communication system, comprising:
a transmission unit configured to transmit one or more transmission signals; and
a receiving unit configured to receive one or more transmission signals,
wherein, the transmission unit includes:
a transmission section configured to selectively perform emphasis based on a data signal to generate one or more transmission signals; and
a control section configured to determine whether to perform emphasis to control the transmission section based on a transition pattern of the data signal.
(25) The communication system according to (24), wherein,
the control section includes a look-up table indicating a relationship between the transition patterns, and a flag indicating whether to perform equalization, and determines whether to perform emphasis based on the look-up table,
the receiving unit includes:
a receiving section configured to receive one or more transmission signals; and
a control signal generation section configured to generate a control signal based on the one or more transmission signals received by the reception section, an
The transmission unit further includes a table setting part configured to program the look-up table based on the control signal.
(26) A communication system, comprising:
a transmission unit configured to transmit one or more transmission signals; and
a receiving unit configured to receive one or more transmission signals,
wherein, the transmission unit includes:
a transmission section configured to selectively perform emphasis based on a data signal to generate one or more transmission signals; and
a control part configured to determine whether to perform emphasis based on a transition pattern of the data signal to control the transmission part, and
the receiving unit includes:
a first receiving section configured to receive one or more transmission signals;
an equalizer configured to perform equalization on one transmission signal or each of a plurality of transmission signals;
a second receiving section configured to receive the equalized one or more transmission signals; and
a selection control section configured to select the first output signal of the first receiving section or the second output signal of the second receiving section based on a transition pattern of one or more transmission signals received by the first receiving section or the second receiving section.
Additionally or alternatively, it should be noted that the present technology is allowed to have the following configuration.
(1) A transmitter (launcher), comprising:
a transmission control circuit configured to determine whether to perform an emphasis on the data signal based on a transition pattern of the data signal; and
a transmission driver configured to selectively perform emphasis based on a result determined by the transmission control circuit to generate at least one transmission signal.
(2) The transmitter according to (1), wherein,
the data signal represents a series of transmission symbols, and
the transmission control circuit is configured to compare two consecutive transmission symbols and determine whether to perform emphasis based on a result of the comparison.
(3) The transmitter according to (1) or (2), wherein the transmission control circuit includes a look-up table indicating a relationship between transition patterns and a flag indicating whether to perform the emphasis, and is configured to determine whether to perform the emphasis based on the look-up table.
(4) The transmitter according to (3), wherein the look-up table is programmable.
(5) The transmitter according to any one of (1) to (4), wherein the transmission driver is configured to selectively perform emphasis to selectively increase the high-frequency component of the at least one transmission signal.
(6) The transmitter according to (5), wherein,
respective ones of the at least one transmission signal make transitions from a first voltage state of the plurality of voltage states to a second voltage state of the plurality of voltage states, and
the transmission control circuit is configured to determine that emphasis is to be performed on respective ones of the at least one transmission signal in respective ones of the transitions.
(7) The transmission unit according to (5) or (6), wherein,
the at least one transmission signal is three transmission signals,
respective ones of the three transmission signals make transitions from one of a high voltage state, a low voltage state and an intermediate voltage state to another,
the transmission control circuit is configured to determine that emphasis is to be performed on a corresponding transmission signal making a transition from a high-voltage state or an intermediate-voltage state to a low-voltage state, and
the transmission control circuit is configured to determine that emphasis is to be performed on a respective transmission signal making a transition from a low voltage state or an intermediate voltage state to a high voltage state.
(8) The transmission unit according to (7), wherein the transmission control circuit is configured to determine that emphasis is to be performed on the respective transmission signal maintained in the high voltage state or the low voltage state.
(9) The transmission unit according to (7) or (8), wherein,
the transmission control circuit is configured to determine that emphasis is not to be performed on the corresponding transmission signal making the transition from the high-voltage state or the low-voltage state to the intermediate-voltage state, and
the transmission control circuit is configured to determine that no emphasis is to be performed on the respective transmission signal maintained in the intermediate voltage state.
(10) The transmission unit according to (5) or (6), wherein,
the at least one transmission signal is a first transmission signal, a second transmission signal and a third transmission signal,
respective ones of the first, second, and third transmission signals make transitions from one to another of a high voltage state, a low voltage state, and an intermediate voltage state, and
the transmission control circuit is configured to determine that emphasis is to be performed on the second transmission signal and the third transmission signal when the first transmission signal makes a transition from a high-voltage state to an intermediate-voltage state, the second transmission signal makes a transition from a low-voltage state to a high-voltage state, and the third transmission signal makes a transition from the intermediate-voltage state to the low-voltage state.
(11) The transmission unit according to (5) or (6), wherein,
the at least one transmission signal is a first transmission signal, a second transmission signal and a third transmission signal,
respective ones of the first, second, and third transmission signals make transitions from one to another of a high voltage state, a low voltage state, and an intermediate voltage state, and
the transmission control circuit is configured to determine that the emphasis is to be performed when there is a change between respective polarities of a first difference signal between the first transmission signal and the second transmission signal, a second difference signal between the second transmission signal and the third transmission signal, and a third difference signal between the first transmission signal and the third transmission signal.
(12) The transmitter according to any one of (1) to (4), wherein the transmission driver is configured to selectively perform emphasis to selectively reduce the low-frequency component of the at least one transmission signal.
(13) The transmitter according to (12), wherein,
respective ones of the at least one transmission signal make transitions from a first voltage state of the plurality of voltage states to a second voltage state of the plurality of voltage states, and
the transmit control circuit is configured to determine that emphasis is to be performed on respective ones of the at least one transmit signal that are maintained in the plurality of voltage states.
(14) The transmitter according to (12) or (13), wherein,
the at least one transmission signal is three transmission signals,
respective ones of the three transmission signals make transitions from one to the other of a high voltage state, a low voltage state, and an intermediate voltage state, and
the transmission control circuit is configured to determine that emphasis is to be performed on the respective transmission signal maintained in the high voltage state or the low voltage state.
(15) The transmitter according to (14), wherein the transmission control circuit is configured to determine that emphasis will not be performed on the respective transmission signal maintained in the intermediate voltage state.
(16) The transmitter according to any one of (1) to (15), wherein,
at least one transmission signal is a plurality of transmission signals, and
the transmission control circuit is configured to individually determine whether to perform emphasis on respective ones of the plurality of transmission signals.
(17) The transmitter according to any one of (1) to (15), wherein,
at least one transmission signal is a plurality of transmission signals, and
the transmission control circuit is configured to collectively determine whether to perform emphasis on respective ones of the plurality of transmission signals.
(18) An imaging system, comprising:
a CMOS image sensor configured to generate a data signal; and
the conveyor according to any one of (1) to (17).
(19) A receiver, comprising:
a first receiving circuit configured to receive at least one transmission signal and output a first output signal;
an equalizer configured to perform equalization on at least one transmission signal;
a second receiving circuit configured to receive the at least one equalized transmission signal from the equalizer and output a second output signal; and
a selection control circuit configured to select between the first output signal and the second output signal based on a transition mode of the at least one transmission signal.
(20) The receiver of (19), wherein the selection control circuit determines a series of voltage states in the at least one transmission signal, compares two temporally adjacent voltage states in the series of voltage states, and selects between the first output signal and the second output signal based on a result of the comparison.
(21) The receiver according to (19) or (20), wherein the selection control circuit includes a look-up table indicating a relationship between the transition patterns and a flag indicating whether emphasis is performed, and selects between the first output signal and the second output signal based on the look-up table.
(22) The receiver according to any one of (19) to (21), wherein the equalizer is configured to perform equalization to increase a high-frequency component of the at least one transmission signal.
(23) The receiver according to any one of (19) to (22), wherein the at least one transmission signal is three transmission signals, and
respective ones of the three transmission signals make transitions from one of a high voltage state, a low voltage state, and an intermediate voltage state to another.
(24) An apparatus, comprising:
a circuit configured to generate a data signal; and
the receiver according to any one of (19) to (23).
(25) A communication system, comprising:
a transmitter, the transmitter comprising:
a transmission control circuit configured to determine whether to perform pre-emphasis on the data signal based on a transition pattern of the data signal, and
a transmission driver configured to selectively perform pre-emphasis based on a result determined by the transmission control circuit to generate at least one transmission signal; and
a selection control circuit configured to select between the first output signal and the second output signal based on a transition mode of the at least one transmission signal.
(26) A communication system, comprising:
a transmitter; and
a receiver, the receiver comprising:
a first receiving circuit configured to receive at least one transmission signal and output a first output signal,
an equalizer configured to perform post-emphasis on the at least one transmission signal to generate at least one equalized transmission signal,
a second receiving circuit configured to receive at least one equalized transmission signal from the equalizer and output a second output signal, an
A selection control circuit configured to select between the first output signal and the second output signal based on a transition mode of the at least one transmission signal.
It should be understood that various changes, combinations, sub-combinations and alterations can be made by those skilled in the art, depending on design requirements and other factors, while remaining within the scope of the appended claims or their equivalents.
REFERENCE SIGNS LIST
1. 1E, 2 communication system
9A to 9C transmission path
10. 10B, 10E, 40 transmission unit
11. 11B signal generating section
12 register
13-15, 14B, 15B flip-flop
16E LUT generation section
19、19B、59LUT
20. 20B, 50 transmission part
21 output control part
22A to 22C output section
23 weighting control part
24A to 24C output section
25. 26 transistor
27. 28 resistor device
30. 30E, 60 receiving unit
31A-31C resistor arrangement
32A to 32C amplifier
33 clock generation part
34. 35 trigger
36. 36E signal generating section
37E mode detecting section
61 equalizer
62. 63 receiving part
64 register
65 signal generating part
66. 67FIFO memory
68 selector
100. 110 symbol determination section
120. 130, 140, 150, 160, 170 logic circuit
121 to 125AND circuit
180OR circuit
AB. Difference between BC, CA, AB2, BC2 and CA2
CS, CS2, NS, PS2 symbols
EA to EC, EE, EA2 to EC2, EE2, SEL, SIGA to SIGC, SIGA2 to SIGC2, S1, S2, RxF, RxR, RxP, RxF1, RxR1, RxP1, RxF2, RxR2, RxP2, TxF, TxR, TxP signals
DET signal
EM eye mask
SH, SL, SM voltage states
RxCK, RxCK1, RxCK2, TxCK clocks
tinA, tinB, tinC input terminal
TJ jitter
ToutA, ToutB and ToutC output terminals
VH high level voltage
VL low level voltage
Level voltage in VM
The voltage of V1.