CN112445745B - Device and method for long-distance signal transmission - Google Patents
Device and method for long-distance signal transmission Download PDFInfo
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- CN112445745B CN112445745B CN202110123633.1A CN202110123633A CN112445745B CN 112445745 B CN112445745 B CN 112445745B CN 202110123633 A CN202110123633 A CN 202110123633A CN 112445745 B CN112445745 B CN 112445745B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
- G06F15/16—Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs
- G06F15/163—Interprocessor communication
Abstract
The invention discloses a device and a method for long-distance transmission of signals, wherein the device comprises a QSPI signal control end, a signal mutual conversion module and a QSPI signal equipment end; the QSPI signal control end outputs the QSPI signal in a differential signal mode, and the QSPI signal comprises a differential clock output signal; the signal conversion module receives the differential signal and a QSPI feedback signal returned by the QSPI signal receiving end in the form of a single-ended signal after the QSPI signal is obtained; and realizing the bidirectional conversion of differential and single-ended signals; the QSPI signal equipment end is arranged at the near end of the signal conversion module and outputs the QSPI feedback signal in a single-ended signal mode; the QSPI feedback signal comprises a single-ended clock return signal; the single-ended clock return signal is converted into a differential clock return signal through a signal conversion module and then is used as a data recovery clock of the QSPI signal control end; the invention carries out differential and single-end conversion on the transmission mode of the signal, and designs the returned clock signal at the equipment end, thereby realizing high-speed, high-quality and long-distance transmission of the signal.
Description
Technical Field
The invention belongs to the technical field of signal transmission, and particularly relates to a device and a method for long-distance signal transmission.
Background
At present, QSPI signals are mostly applied to the scene of on-board communication, the transmission distance is short, and the transmission speed is high; as shown in fig. 1, the QSPI master control and the QSPI device are interconnected on the same board card, and the wiring distance is short, so that high-speed transmission of signals can be realized.
When the signal is transmitted in a long distance, the signal is easily interfered, the unstable signal quality is easy to occur, and the signal transmission rate is reduced along with the signal, even the signal cannot work normally. Fig. 2 is a schematic diagram of cross-board interconnection of a QSPI signal source and a QSPI signal receiving end, and experiments show that when the cross-board interconnection is performed, the longest wiring distance between the QSPI signal source and the QSPI signal receiving end does not exceed 200mm, the transmission rate is generally low, and does not exceed 20Mbps, and then normal communication can be ensured; once the wiring distance exceeds 200mm, the signal interference is large, the transmission rate is also seriously reduced, and normal communication cannot be carried out between the QSPI signal source and the QSPI signal receiving end.
Disclosure of Invention
In view of at least one of the drawbacks and needs of the prior art, the present invention provides an apparatus and method for long-distance transmission of signals, which aims to improve the transmission rate and the interference rejection capability of QSPI signals and adapt them to long-distance transmission.
In order to achieve the above object, according to one aspect of the present invention, there is provided an apparatus for long distance transmission of a signal, including a QSPI signal control terminal, a signal interconversion module, and a QSPI signal device terminal; the QSPI signal control end is connected with the signal conversion module through a differential signal line, and the signal conversion module is connected with the QSPI signal receiving end through a single-ended signal line;
the QSPI signal control end outputs a QSPI signal in a differential signal mode, and the QSPI signal comprises a differential clock output signal and a differential data signal;
the signal conversion module receives the differential signal output by the QSPI signal control end and a QSPI feedback signal returned by the QSPI signal receiving end in the form of a single-ended signal after the QSPI signal is obtained; and realizing bidirectional conversion of a differential signal and a single-ended signal under the control of the QSPI signal control end;
the QSPI signal equipment end is arranged at the near end of the signal conversion module, receives the QSPI signal converted by the signal conversion module and outputs the QSPI feedback signal in the form of a single-ended signal; the QSPI feedback signals comprise single-ended clock return signals and single-ended data signals;
the single-ended clock return signal is a signal which is homologous with the differential clock output signal, and is converted into a differential clock return signal through the signal conversion module and then is used as a data recovery clock of the QSPI signal control end.
This application has designed the return circuit clock that returns QSPI signal control end all the way at QSPI signal equipment end, and the signal transmission of two directions all has respective associated with the way clock in other words, carries out data sampling according to respective associated with the way clock, has not only solved the error code problem that the sampling error leads to, and above all, can prolong signal transmission path and promote transmission speed, realizes the long distance transmission of signal.
Preferably, in the apparatus for transmitting signals over long distances, the QSPI signals further include chip select differential signals.
Preferably, in the device for transmitting signals over long distances, the QSPI signals further include a direction switching signal;
the signal conversion module comprises a conversion circuit with a bidirectional conversion channel and a selection switch;
the bidirectional conversion channel is used for realizing bidirectional conversion of the differential data signal and the single-ended data signal; the selection switch is used for adjusting the signal conversion direction of the bidirectional conversion channel under the control of the direction switching signal.
Preferably, in the device for long-distance signal transmission, the conversion circuit further includes a unidirectional transmission channel;
the unidirectional transmission channel is used for transmitting differential clock output signals or single-ended clock return signals.
Preferably, in the apparatus for long-distance signal transmission, the signal conversion module further includes a driver;
the driver is arranged between the selection switch and the QSPI signal equipment end and used for amplifying the single-ended signal output by the conversion circuit so as to enhance the driving capability of the single-ended signal.
Preferably, the device for long-distance signal transmission further comprises a voltage regulation module;
and the voltage regulating module regulates the voltage of the single-ended signal output to the QSPI signal receiving end by the signal conversion module under the control of the QSPI signal control end, so that the voltage is matched with the voltage grade required by the QSPI signal receiving end.
Preferably, in the device for transmitting signals over long distances, the QSPI signals further include a power signal and a voltage control signal;
the voltage regulation module comprises a DAC and a DC-DC converter;
the output end of the DAC is connected with the first input end of the DC-DC converter, the second input end of the DC-DC converter receives the power supply signal provided by the QSPI signal control end, and the output end of the DC-DC converter is connected with the signal conversion module;
and the DAC regulates the output voltage provided by the DC-DC converter to the signal conversion module according to the voltage control signal output by the QSPI signal control end, so that the signal conversion module regulates the voltage of the single-ended signal output by the DAC according to the output voltage.
Preferably, in the apparatus for long-distance signal transmission, the power supply terminal of the driver is connected to the output terminal of the DC-DC converter, and is configured to receive the output voltage provided by the DC-DC converter and adjust the voltage of the single-ended signal according to the output voltage.
Preferably, the device for long-distance signal transmission is characterized in that the QSPI signal control end is arranged on the sending board, the QSPI signal receiving end and the signal conversion module are arranged on the receiving board, and the sending board and the receiving board are interconnected through connectors or cables.
According to an aspect of the present invention, there is provided a method for long-distance transmission of signals, which is used for realizing long-distance transmission of signals between a QSPI signal control end and a QSPI signal equipment end; the method is characterized by comprising the following steps:
providing a signal conversion module, and arranging the signal conversion module at the near end of a QSPI signal device end;
enabling the QSPI signal control end to output QSPI signals to a signal conversion module in a differential signal mode, wherein the QSPI signals comprise differential clock output signals and differential data signals;
the control signal conversion module converts the received QSPI signal into a single-ended signal and provides the single-ended signal to a QSPI signal equipment end;
when the signal conversion module receives a QSPI feedback signal returned by the QSPI signal receiving end in the form of a single-ended signal after the QSPI signal is obtained, the control signal conversion module converts the QSPI feedback signal into a differential signal and provides the differential signal to the QSPI signal control end; the QSPI feedback signals comprise single-ended clock return signals and single-ended data signals;
the single-ended clock return signal is a signal which is homologous with the differential clock output signal, and is converted into a differential clock return signal through the signal conversion module and then is used as a data recovery clock of the QSPI signal control end.
Preferably, in the method for transmitting signals over long distances, the QSPI signals further include a direction switching signal; and controlling the signal conversion direction of the signal conversion module through the direction switching signal.
Preferably, the method for transmitting signals over long distances further comprises:
and providing a voltage regulating module for controlling the voltage regulating module to regulate the voltage of the single-ended signal output to the QSPI signal receiving end by the signal conversion module so as to match the voltage grade required by the QSPI signal receiving end.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the device and the method for signal long-distance transmission utilize the characteristics of strong anti-interference capability and long transmission distance of a differential signal, carry out signal transmission in a form of the differential signal at a QSPI signal control end, and convert the differential signal into a single-ended signal at a QSPI signal equipment end, thereby realizing strong interference when the signal is transmitted across boards in a long distance, ensuring the signal transmission quality and ensuring that the transmission rate is not limited by the transmission distance; a loop clock returning to the QSPI signal control end 10 is designed at the QSPI signal equipment end, which is equivalent to that signal transmission in two directions has respective associated clocks, and data sampling is carried out according to the respective associated clocks, so that the problem of error codes caused by sampling errors is solved, and most importantly, a signal transmission path can be prolonged, the transmission speed is increased, and long-distance transmission of signals is realized.
(2) According to the device and the method for long-distance signal transmission, the voltage adjusting module is arranged, so that the signal voltage can be flexibly adjusted according to the actual voltage requirement of the QSPI equipment end, and the application flexibility is enhanced.
(3) The device and the method for long-distance signal transmission can be used in the application scenes of the Demura burner of the current LCD and OLED screens and the application scenes of multi-stage cascade of the board cards of QSPI signals, and have wider application scenes.
Drawings
FIG. 1 is a schematic diagram of the on-board communication of a common QSPI signal;
FIG. 2 is a schematic diagram of inter-board communication of a common QSPI signal;
fig. 3 is a schematic structural diagram of a device for long-distance signal transmission according to an embodiment of the present invention;
fig. 4 is a communication diagram of the device for long-distance signal transmission according to the present embodiment applied to inter-board communication;
fig. 5 is a schematic diagram illustrating a specific composition of the apparatus for long-distance signal transmission according to the present embodiment;
in all the figures, the same reference numerals denote the same features, in particular: 10-QSPI signal control end; 20-a signal conversion module; 30-QSPI signal equipment end; 40-differential signal lines; 50-single-ended signal lines; 60-voltage regulation module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 3 is a schematic diagram of a structure of a signal long-distance transmission apparatus provided in this embodiment, and fig. 4 is a schematic diagram of communication when the signal long-distance transmission apparatus provided in this embodiment is applied to inter-board communication, referring to fig. 3 and 4, the apparatus includes a QSPI signal control terminal 10, a signal conversion module 20, and a QSPI signal device terminal 30; the QSPI signal control end 10 is connected with the signal conversion module 20 through a differential signal line 40, and the signal conversion module 20 is connected with the QSPI signal equipment end 30 through a single-ended signal line 50;
the QSPI signal control end 10 is used as a signal source to generate a QSPI signal and output the QSPI signal to the signal conversion module 20 in a differential signal form; the QSPI signal comprises a differential clock output signal, a differential data signal and a differential chip selection signal; in this embodiment, the differential signal may be, but is not limited to, an LVDS signal, and the core controller IC in the QSPI signal control terminal 10 may be an FPGA, a CPU, an ASIC, an ARM, and other chips;
in order to realize long-distance transmission of signals, a signal conversion module 20 is additionally arranged in the application, and the signal conversion module 20 is arranged at the near end of a QSPI signal equipment end 30; it should be noted that, the near end means that the distance between the signal conversion module 20 and the QSPI signal device end 30 is smaller than the distance between the signal conversion module 20 and the QSPI signal control end 10, and the distance between the signal conversion module 20 and the QSPI signal device end 30 is preferably not more than 200 mm; the signal conversion module 20 is mainly used for realizing bidirectional conversion between a differential signal and a single-ended signal under the control of the QSPI signal control end 10, and on one hand, the signal conversion module 20 receives the differential signal output by the QSPI signal control end 10, converts the differential signal into a single-ended signal, and transmits the single-ended signal to the QSPI signal equipment end 30; the QSPI signal device 30 generates a QSPI feedback signal after obtaining the QSPI signal in the single-ended signal form, and the QSPI feedback signal is transmitted to the signal conversion module 20 in the single-ended signal form; after receiving the single-ended signal corresponding to the QSPI feedback signal, the signal interconversion module 20 converts the single-ended signal into a differential signal and feeds the differential signal back to the QSPI signal control end 10; in this embodiment, the single-ended signal may be, but is not limited to, a TTL signal.
The QSPI feedback signal output by the QSPI signal device 30 includes a single-ended clock return signal and a single-ended data signal; the single-ended clock return signal is a signal which is homologous with a differential clock output signal provided by the QSPI signal control end 10, and is converted into the differential clock return signal by the signal conversion module to be used as a data recovery clock of the QSPI signal control end 10, and the single-ended clock return signal returned by the QSPI signal equipment end 30 is used as a sampling clock by the QSPI signal control end 10 when data is read back, so that phase deviation of the data and the clock signal is avoided, and the data can be recovered correctly.
The characteristics of strong anti-interference capability and long transmission distance of the differential signal are utilized, the signal transmission is carried out at the QSPI signal control end in the form of the differential signal, and the differential signal is converted into the single-ended signal at the QSPI signal equipment end, so that the signal transmission quality is ensured, and the transmission rate is not limited by the transmission distance.
In addition, the clock of the QSPI signal is transmitted in one direction under normal conditions, and the sampling is performed based on the one-way clock regardless of the signal from the signal source end to the device end or the signal from the device end to the signal source end; however, once the link for signal transmission increases, the signal transmission rate decreases, which may cause a judgment error to occur when sampling the signal from the device end to the signal source end based on the unidirectional clock, resulting in an error code. Therefore, in this embodiment, a loop clock returning to the QSPI signal control end 10 is designed at the QSPI signal device end 30, which is equivalent to that signal transmission in two directions has respective associated clocks, and data sampling is performed according to the respective associated clocks, so that not only is the problem of error code caused by sampling error solved, but most importantly, the signal transmission path can be extended and the transmission speed can be increased, thereby realizing long-distance transmission of signals.
As shown in fig. 4, in a specific application scenario, the QSPI signal control terminal 10 in the apparatus for long-distance signal transmission is disposed on a sending board, the QSPI device terminal 30 and the signal interconversion module 20 are disposed on a receiving board, and the sending board and the receiving board are interconnected by connectors or cables. The QSPI signal sent by the QSPI signal control terminal 10 is output to the connector CON on the transmitting board in the form of a differential signal, the connector CON is connected to the connector CON on the receiving board through a differential signal line, the connector CON on the transmitting board transmits the QSPI signal to the connector CON on the receiving board through the differential signal line, and then the connector CON on the receiving board transmits the QSPI signal to the signal conversion module 20.
In addition, the method can also be used in an application scenario of multi-stage cascade of the board cards of the QSPI signals, where the multi-stage cascade of the board cards refers to a situation that a plurality of other PCB boards are also cascaded between the transmitting board and the receiving board, and the multi-stage cascade causes long-distance transmission of the QSPI signals between the transmitting board and the receiving board.
Fig. 5 is a schematic diagram of a specific composition of the device for long-distance signal transmission provided in this embodiment, and referring to fig. 5, in order to control bidirectional signal conversion of the signal conversion module 20, in this embodiment, the QSPI signal generated by the QSPI signal control end further includes a direction switching signal;
the signal conversion module 20 includes a conversion circuit having a bidirectional conversion channel, and a selection switch; the selection switch is used for adjusting the signal conversion direction of the bidirectional conversion channel under the control of a direction switching signal sent by the QSPI signal control end, and bidirectional conversion of the differential data signal and the single-ended data signal is achieved. In a specific example, the number of the bidirectional conversion channels and the number of the selection switches are not less than the number of channels included in the data signal, and in this embodiment, the differential data signal and the single-ended data signal respectively include four-channel data signals DO-D3, so that the signal conversion module 20 is correspondingly provided with four bidirectional conversion channels, and each bidirectional conversion channel is correspondingly configured with one selection switch. Differential clock output signals and differential chip selection signals which only need to be transmitted in a single direction in QSPI signals and single-ended clock return signals in QSPI feedback signals can also be transmitted through a bidirectional conversion channel, and only respective transmission directions need to be set through selection switches.
In a preferred embodiment, the conversion circuit further includes a plurality of unidirectional transmission channels; the unidirectional transmission channel is mainly used for transmitting differential clock output signals, single-ended clock return signals and differential chip selection signals. The mode of transmitting the differential clock output signal, the single-ended clock return signal and the differential chip selection signal through the bidirectional conversion channel is replaced, the corresponding selection switch can be omitted by adopting the unidirectional transmission channel for signal transmission, and the structure of the device is simplified.
In a preferred embodiment, the signal conversion module 20 further includes a driver;
the driver is arranged between the selection switch and the QSPI signal equipment end and is mainly used for amplifying the single-ended signal output by the conversion circuit so as to enhance the driving capability of the signal.
In this embodiment, the device for long-distance signal transmission further includes a voltage adjusting module 60;
the voltage adjusting module 60 adjusts the voltage of the single-ended signal output by the signal conversion module 20 to the QSPI device terminal 30 under the control of the QSPI signal control terminal 10, so that the voltage is matched with the voltage level required by the QSPI device terminal 30.
In an alternative embodiment, the voltage regulation module 60 includes a DAC and a DC-DC converter; the QSPI signal generated by the QSPI signal control terminal 10 further includes a power signal and a voltage control signal;
the input end of the DAC receives the voltage control signal, and the output end of the DAC is connected with the first input end of the DC-DC converter; a second input end of the DC-DC converter receives the power signal, and an output end thereof is connected to the signal conversion module 20;
the DAC adjusts an output voltage VCCB provided by the DC-DC converter to the signal conversion module 20 according to the voltage control signal, so that the signal conversion module 20 adjusts the voltage of the single-ended signal output by itself according to the output voltage VCCB.
In one specific example, the output terminal of the DC-DC converter is connected to the power supply terminal of the driver, and the driver 60 receives the output voltage provided by the DC-DC converter and adjusts the voltage of the single-ended signal according to the output voltage.
In the embodiment, by providing the voltage adjusting module 60, the signal voltage can be flexibly adjusted according to the actual voltage requirement of the QSPI device 30, so that the application flexibility is enhanced.
In addition, because the QSPI signals (QSPI feedback signals) respectively include the four-channel data signal DO-D3, when the signal transmission distance between the QSPI signal control terminal 10 and the QSPI signal device terminal 30 increases, a large difference occurs between the signal waveform sent by the QSPI signal control terminal 10 and the signal waveform received by the QSPI signal device terminal 30, and the most intuitive expression is that the four-channel data signal DO-D3 in the QSPI signal sent by the QSPI signal control terminal 10 is aligned accurately, and a misalignment occurs between the four-channel data signal DO-D3 received by the QSPI signal device terminal 30. Research shows that when the transmission rate of the QSPI signal is 50MHz, due to the difference of transmission paths, a time difference close to 15ns exists between channel signals, and as the transmission distance increases, the time difference is larger, which directly causes data transmission and reception failure, and can only be solved by reducing the transmission rate. This problem also occurs when the QSPI signal device terminal 30 returns a signal to the QSPI signal control terminal 10.
Therefore, the present application designs a phase adaptive function at the QSPI signal control end 10, specifically, before signal transmission, the QSPI signal control end 10 first determines a transmission delay of a data signal of each channel between the QSPI signal control end 10 and the QSPI signal device end 30, decomposes a differential clock output signal in the QSPI signal into channel clock output signals corresponding to four channels based on the signal transmission delay of each channel, and then performs phase pre-shifting on the data signal of the corresponding channel according to each channel clock output signal to implement pre-compensation of the transmission delay. After pre-compensation, alignment will be maintained between the four-channel data signals DO-D3 transmitted to the QSPI signal device end 30.
In the present application, the QSPI signal sent by the QSPI signal control end 10 to the QSPI signal device end 30 includes four channel clock output signals, and similarly, the QSPI feedback signal returned by the QSPI signal device end 30 to the QSPI signal control end 10 also includes a channel clock output signal in the form of a four channel single-ended signal, and after the QSPI feedback signal is converted into a differential signal by the signal conversion module 20, the QSPI signal control end 10 receives the four channel clock input signals, independently acquires the data signals on the respective channels according to each channel clock input signal, and aligns and reassembles the data signals returned on the four channels based on the signal transmission delay of each channel, so as to obtain a complete QSPI feedback signal, and accurately acquire the data returned by the QSPI signal device end 30 by the QSPI signal control end 10.
In a preferred embodiment, in order to further improve the accuracy, the signal transmission delay of each channel is divided into a signal transmission delay and a signal reception delay, the QSPI signal control terminal 10 performs phase pre-shift on the data signal of each channel according to the signal transmission delay, and performs alignment and reassembly on the data signals returned from the four channels according to the signal reception delay.
The embodiment provides a method for long-distance signal transmission, which is used for realizing the long-distance signal transmission between a QSPI signal control end and a QSPI signal equipment end; the method specifically comprises the following steps:
providing a signal conversion module, and arranging the signal conversion module at the near end of a QSPI signal device end;
enabling the QSPI signal control end to output the QSPI signal to a signal conversion module in a differential signal mode, wherein the QSPI signal comprises a differential clock output signal, a differential data signal and a differential chip selection signal;
the control signal conversion module converts the received QSPI signal into a single-ended signal and provides the single-ended signal to a QSPI signal equipment end;
when the signal conversion module receives a QSPI feedback signal returned by the QSPI equipment end in the form of a single-ended signal after the QSPI signal is obtained, the control signal conversion module converts the QSPI feedback signal into a differential signal and provides the differential signal to the QSPI signal control end; the QSPI feedback signals comprise single-ended clock return signals and single-ended data signals;
the single-ended clock return signal is a signal which is homologous with the differential clock output signal, and is converted into a differential clock return signal through the signal conversion module and then is used as a data recovery clock of the QSPI signal control end.
In a specific example, the QSPI signal further includes a direction switching signal; the direction switching signal controls the signal conversion direction of the signal conversion module to realize the bidirectional conversion of the differential signal and the single-ended signal.
In a preferred embodiment, the method for long-distance transmission of signals further includes:
the QSPI signals also comprise power signals and voltage control signals;
and providing a voltage regulating module, wherein the power supply signal is the power supply voltage of the voltage regulating module, and the voltage of the single-ended signal output to the QSPI equipment end by the voltage regulating module regulating signal conversion module is regulated through the voltage control signal so as to be matched with the voltage grade required by the QSPI equipment end.
In a preferred embodiment, the method for long-distance transmission of signals further includes:
determining the transmission delay of the data signal of each channel between a QSPI signal control end and a QSPI signal equipment end, and decomposing a differential clock output signal in the QSPI signal into channel clock output signals corresponding to four channels respectively based on the signal transmission delay of each channel;
carrying out phase pre-offset on the data signals of the corresponding channels according to the clock output signal of each channel to realize pre-compensation of transmission delay;
the differential clock return signals received by the QSPI signal control end comprise four-channel clock input signals, data signals on respective channels are independently acquired according to the channel clock input signals, and the data signals returned on the four channels are aligned and recombined based on the signal transmission delay of each channel, so that complete QSPI feedback signals are obtained.
In a preferred embodiment, the method for long-distance transmission of signals further includes:
dividing the signal transmission delay of each channel into a signal transmission delay and a signal reception delay, and performing phase pre-shift on the data signal of each channel by the QSPI signal control terminal 10 according to the signal transmission delay, and aligning and recombining the data signals returned from the four channels according to the signal reception delay.
It should be noted that the scheme provided by the application is also suitable for long-distance transmission of the SPI signal, and adopts a signal transmission mode of differential-single-ended mutual conversion to realize long-distance and high-speed transmission of the QSPI/SPI signal and improve the anti-interference capability of the signal; experiments show that by adopting the scheme provided by the application, the signal transmission distance can be prolonged to more than 1000mm, and the signal transmission rate is more than 60 Mbps; the scheme is suitable for various use scenes with QSPI signal cross-board connection communication and long wiring distance, for example, the scheme is applied to a Demura burner of screens of an LCD and an OLED, namely the Demura burner burns data into FLASH scenes in a QSPI bus mode, and the use scenes are wide.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A device for long-distance signal transmission is characterized by comprising a QSPI signal control end, a signal mutual conversion module and a QSPI signal equipment end;
the QSPI signal control end outputs a QSPI signal in a differential signal mode, and the QSPI signal comprises a differential clock output signal and a differential data signal; the QSPI signal control end decomposes the differential clock output signals into channel clock output signals respectively corresponding to each channel based on the signal transmission delay of each channel, and carries out phase pre-shift on the data signals of the corresponding channels in the differential data signals according to each channel clock output signal;
the signal conversion module receives the differential signal output by the QSPI signal control end and a QSPI feedback signal returned by the QSPI signal receiving end in the form of a single-ended signal after the QSPI signal is obtained; and realizing bidirectional conversion of a differential signal and a single-ended signal under the control of the QSPI signal control end;
the QSPI signal equipment end is arranged at the near end of the signal conversion module, receives the QSPI signal converted by the signal conversion module and outputs the QSPI feedback signal in the form of a single-ended signal; the QSPI feedback signals comprise single-ended clock return signals and single-ended data signals;
the single-ended clock return signal is a signal which is homologous with the differential clock output signal, and is converted into a differential clock return signal through the signal conversion module and then is used as a data recovery clock of the QSPI signal control end;
the differential clock return signals received by the QSPI signal control end comprise channel clock input signals corresponding to the channels, data signals on the channels are independently acquired according to the channel clock input signals corresponding to the channels, and the data signals returned on the channels are aligned and recombined based on the signal transmission delay of the channels.
2. The apparatus for long distance transmission of signals according to claim 1, wherein said QSPI signals further include a direction switching signal;
the signal conversion module comprises a conversion circuit with a bidirectional conversion channel and a selection switch;
the bidirectional conversion channel is used for realizing bidirectional conversion of the differential data signal and the single-ended data signal; the selection switch is used for adjusting the signal conversion direction of the bidirectional conversion channel under the control of the direction switching signal.
3. The apparatus for long distance transmission of signals according to claim 2, wherein said conversion circuit further comprises a unidirectional transmission channel;
the unidirectional transmission channel is used for transmitting differential clock output signals or single-ended clock return signals.
4. The apparatus for long distance transmission of signals according to claim 3, wherein said signal conversion module further comprises a driver;
the driver is used for amplifying the single-ended signal output by the conversion circuit so as to enhance the driving capability of the single-ended signal.
5. The apparatus for long distance transmission of signals according to claim 1 or 4, further comprising a voltage regulation module;
and the voltage regulating module regulates the voltage of the single-ended signal output to the QSPI signal receiving end by the signal conversion module under the control of the QSPI signal control end, so that the voltage is matched with the voltage grade required by the QSPI signal receiving end.
6. The apparatus for long distance transmission of signals according to claim 5, wherein said QSPI signals further comprise a power signal and a voltage control signal;
the voltage regulation module comprises a DAC and a DC-DC converter;
the output end of the DAC is connected with the first input end of the DC-DC converter, the second input end of the DC-DC converter receives the power supply signal provided by the QSPI signal control end, and the output end of the DC-DC converter is connected with the signal conversion module;
and the DAC regulates the output voltage provided by the DC-DC converter to the signal conversion module according to the voltage control signal output by the QSPI signal control end, so that the signal conversion module regulates the voltage of the single-ended signal output by the DAC according to the output voltage.
7. The apparatus for long-distance signal transmission according to claim 1, wherein the QSPI signal control terminal is disposed on a transmitting board, the QSPI signal receiving terminal and the signal conversion module are disposed on a receiving board, and the transmitting board and the receiving board are interconnected by connectors or cables.
8. A long-distance signal transmission method is used for realizing long-distance signal transmission between a QSPI signal control end and a QSPI signal equipment end; the method is characterized by comprising the following steps:
providing a signal conversion module, and arranging the signal conversion module at the near end of a QSPI signal device end;
enabling the QSPI signal control end to output QSPI signals to a signal conversion module in a differential signal mode, wherein the QSPI signals comprise differential clock output signals and differential data signals; decomposing the differential clock output signal into channel clock output signals respectively corresponding to each channel based on the signal transmission delay of each channel, and performing phase pre-offset on the data signals of the corresponding channels in the differential data signals according to each channel clock output signal;
the control signal conversion module converts the received QSPI signal into a single-ended signal and provides the single-ended signal to a QSPI signal equipment end;
when the signal conversion module receives a QSPI feedback signal returned by the QSPI signal receiving end in the form of a single-ended signal after the QSPI signal is obtained, the control signal conversion module converts the QSPI feedback signal into a differential signal and provides the differential signal to the QSPI signal control end; the QSPI feedback signals comprise single-ended clock return signals and single-ended data signals;
the single-ended clock return signal is a signal which is homologous with the differential clock output signal, and is converted into a differential clock return signal through the signal conversion module and then is used as a data recovery clock of the QSPI signal control end;
the differential clock return signals received by the QSPI signal control end comprise channel clock input signals corresponding to the channels, data signals on the channels are independently acquired according to the channel clock input signals corresponding to the channels, and the data signals returned on the channels are aligned and recombined based on the signal transmission delay of the channels.
9. The method for long distance transmission of signals according to claim 8, wherein said QSPI signals further include a direction switching signal; and controlling the signal conversion direction of the signal conversion module through the direction switching signal.
10. The method for long distance transmission of signals according to claim 8, further comprising:
and providing a voltage regulating module for controlling the voltage regulating module to regulate the voltage of the single-ended signal output to the QSPI signal receiving end by the signal conversion module so as to match the voltage grade required by the QSPI signal receiving end.
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