TWI692235B - Half-duplex data transmission method and communication system using the same - Google Patents

Abstract

A half-duplex data transmission method for performing a forward data transmission procedure and a reverse data transmission procedure between a master device and a slave device, the forward data transmission program is used to transmit at least one frame picture Like data, the reverse data transmission procedure includes the following steps: the master device provides a clock signal through a TMDS clock channel and a frame synchronization signal through a first TMDS data channel; the slave device is investigating When it is detected that the frame synchronization signal assumes an active state, it transitions to a transmission state, and then under the control of the clock signal, reverse data is transmitted from a second TMDS data channel and/or a third TMDS data channel; and the The master device samples the reverse data according to the clock signal.

Description

Half-duplex data transmission method and communication system using the same

The invention relates to a high-speed data transmission method, in particular to a half-duplex high-speed data transmission method.

TMDS (transition minimized differential signaling), also known as minimized differential signaling, refers to the conversion of the original signal data through mutual exclusion or other logical operations to generate 10-bit data, of which the 9th bit is used to indicate the operation The 10th bit is used to ensure DC balance (referring to ensuring that the DC offset in the channel is zero during the encoding process), and the converted data is transmitted in a differential manner to reduce electromagnetic interference and improve The speed and reliability of signal transmission.

For a general HDMI (high definition multimedia interface) or DVI (digital visual interface) device, it can be a TMDS input device or a TMDS output device, and a general TMDS output device Between the TMDS input device and three different TMDS data information channels and a clock channel, one-way transmission of video, audio data and additional information.

However, the existing TMDS output device and TMDS input device can only transmit data in one direction, which is its shortcoming.

In order to solve the above problems, a novel TMDS data transmission solution is urgently needed in the art.

An object of the present invention is to disclose a half-duplex data transmission method, which can use the existing channel to perform reverse data transmission through the transmission gap of TMDS image data.

Another object of the present invention is to disclose a communication system which can utilize the existing channels for reverse data transmission through the transmission gap of TMDS image data.

To achieve the aforementioned objective, a half-duplex data transmission method is proposed for performing a forward data transmission procedure and a reverse data transmission procedure between a master device and a slave device, the forward data transmission procedure It is used to transmit at least one frame of image data, which includes using a TMDS clock channel to transmit a clock signal, using a first TMDS data channel to transmit a frame synchronization signal, and using the first TMDS data channel and a second TMDS At least one data channel selected by a group consisting of a data channel and a third TMDS data channel transmits the at least one frame of image data, characterized in that the reverse data transmission procedure includes the following steps:

The master device outputs the clock signal through the TMDS clock channel and the frame synchronization signal through the first TMDS data channel;

When detecting that the frame synchronization signal assumes an active state from the first TMDS data channel, the slave device transitions to a transmitting state, and then under the control of the TMDS clock signal, the second TMDS data channel and/or The third TMDS channel carries reverse data; and

The master device samples the reverse data according to the clock signal, wherein the reverse data has a synchronization head for the master device to correctly parse the reverse data.

In one embodiment, the reverse data transmission procedure occurs during at least one vertical blanking period.

In an embodiment, the reverse data transmission procedure further includes a reverse transmission stop step, which is to stop the slave device from transmitting the reverse data by issuing a command to the slave device from the master device.

In one embodiment, the reverse data transmission procedure further includes a reverse transmission stop step, which stops the slave device from transmitting the reverse data after the frame synchronization signal is transmitted for a specified number of times.

In a possible embodiment, the slave device obtains the specified number of times from a command issued by the master device, or the specified number of times is preset in the slave device.

In an embodiment, the reverse data has a data tail for the master device to end the receiving mode.

In an embodiment, the reverse data has a check code for the host device to verify the correctness of the reverse data.

In addition, the present invention further proposes a communication system having a master device and a slave device, and capable of performing a forward data transmission procedure and a reverse data transmission procedure between the master device and the slave device. The data transmission procedure is used to transmit at least one frame of image data, which includes using a TMDS clock channel to transmit a clock signal, using a first TMDS data channel to transmit a frame synchronization signal, and using the first TMDS data channel, At least one data channel selected by the group consisting of a second TMDS data channel and a third TMDS data channel transmits the at least one frame of image data, characterized in that the reverse data transmission procedure includes the following steps :

The master device outputs the clock signal through the TMDS clock channel and the frame synchronization signal through the first TMDS data channel;

When detecting that the frame synchronization signal assumes an active state from the first TMDS data channel, the slave device transitions to a transmitting state, and then under the control of the TMDS clock signal, the second TMDS data channel and/or The third TMDS data channel carries reverse data; and

The master device samples the reverse data according to the clock signal, wherein the reverse data has a synchronization head for the master device to correctly parse the reverse data.

In a possible embodiment, the reverse data transmission procedure occurs during at least one vertical blanking period; the reverse data transmission procedure further includes a reverse transmission stop step, which is issued by the master device Command to the slave device to stop the slave device from transmitting the reverse data, or to stop the slave device from transmitting the reverse data after the frame synchronization signal has been transmitted a specified number of times, wherein the slave device The specified number of times is obtained from a command issued by the master device, or the specified number of times is preset in the slave device.

In a possible embodiment, the reverse data has a data tail for the master device to end the receiving mode, and/or the reverse data has a check code for the master device to verify the reverse data Correctness.

In addition, the present invention further provides a display device having the aforementioned communication system, and it can be a cathode ray tube display device, a digital light processing display device, a liquid crystal display, a light emitting diode display device, an organic light emitting diode display Device, quantum dot light-emitting diode display device, Mirco-LED display device or Mini-LED display device.

In order to enable your reviewing committee to further understand the structure, features and purpose of the present invention, the drawings and the detailed description of the preferred embodiments are attached as follows.

Please refer to FIG. 1, which illustrates a flowchart of an embodiment of a half-duplex data transmission method of the present invention. The method is used to perform a forward data transmission procedure and a reverse process between a master device and a slave device To the data transmission program, the forward data transmission program is used to transmit at least one frame of image data, which includes using a TMDS clock channel to transmit a clock signal, using a first TMDS data channel to transmit a frame synchronization signal, and using At least one data channel selected by the group consisting of the first TMDS data channel, a second TMDS data channel, and a third TMDS data channel transmits the at least one frame of image data, characterized in that the The reverse data transmission procedure includes the following steps: the master device outputs the clock signal through the TMDS clock channel and the frame synchronization signal through the first TMDS data channel (step a); the slave device uses the first TMDS data channel When it is detected that the frame synchronization signal assumes an active state, it transitions to a transmission state, and then under the control of the TMDS clock signal, reverse data is transmitted from the second TMDS data channel and/or the third TMDS data channel ( Step b); and the master device samples the reverse data according to the clock signal, wherein the reverse data has a synchronization header for the master device to correctly parse the reverse data (step c).

In addition, the reverse data transmission procedure occurs during at least one vertical blanking interval.

Preferably, the reverse data transmission procedure further includes a reverse transmission stop step, and the reverse transmission stop step may be: the master device issues a command to the slave device to stop the slave device from transmitting the data. The reverse data; or after the frame synchronization signal is transmitted for a specified number of times to stop the slave device from transmitting the reverse data, wherein the slave device is obtained from a command issued by the master device The specified number of times, or the specified number of times is preset in the slave device.

Preferably, the reverse data has a data tail for the master device to end the receiving mode.

Preferably, the reverse data has a check code (such as (but not limited to) data mutual exclusion or operation result) for the host device to verify the correctness of the reverse data.

In addition, considering the state reversal speed of the master device and the slave device, after completing the reverse data transmission, the slave device must first stop the sending state and immediately switch to the receiving state, and the slave device is in the receiving state Next, all non-video data will be discarded in preparation for receiving the next frame of image data normally.

In addition, although the slave device sends the reverse data at the frequency of the clock signal provided by the master device, its data transmission rate may be lower than or equal to the frequency of the clock signal.

Please refer to FIG. 2, which illustrates an operation diagram of the method shown in FIG. 1. As shown in FIG. 2, in the first step, a master device 100 performs a forward data transmission procedure to a slave device 110 to transmit a frame of image data, which includes using a TMDS clock channel to transmit a clock signal, using a TMDS data channel 0 transmits a frame synchronization signal, and uses at least one of the three data channels TMDS data channel 0, a TMDS data channel 1 and a TMDS data channel 2 to transmit the frame of image data; in the second step In the master device 100, after transmitting the frame of image data, it switches to the receiving mode, and the master device 100 outputs the clock signal through the TMDS clock channel and the frame synchronization signal through the TMDS data channel 0; in the third step , After receiving the frame of image data, the slave device 110 stops receiving the data, and when the TMDS data channel 0 detects that the frame synchronization signal exhibits an active state (such as a high potential), it transitions to a sending state, and then Under the control of the TMDS clock signal, reverse data is transmitted by TMDS data channel 1 and/or TMDS data channel 2, and the master device 100 samples the reverse data according to the clock signal; in the fourth step, the slave The device 110 executes a reverse transmission stop step, and the reverse transmission stop step may be: the master device 100 issues a command to the slave device 110 to stop the slave device 110 from transmitting the reverse data; or synchronize at the frame After the signal is transmitted for a specified number of times, the slave device 110 stops transmitting the reverse data. The slave device 110 obtains the specified number of times from a command issued by the master device 100, or the specified number of times Set in the slave device 110; and in the fifth step, the master device 100 resumes the forward data transmission procedure to the slave device 110.

In addition, according to the above description, the present invention further discloses a communication system.

Please refer to FIG. 3, which illustrates a block diagram of a communication system adopting the half-duplex data transmission method of FIG. 1. As shown in FIG. 3, a communication system 200 includes a master device 210 and a slave device 220, and can perform a forward data transmission procedure and a reverse data transmission procedure between the master device 210 and the slave device 220. The forward data transmission procedure is used to transmit at least one frame of image data, which includes using a TMDS clock channel to transmit a clock signal, using a TMDS data channel 0 to transmit a frame synchronization signal, and using TMDS data channel 0 and a TMDS data At least one data channel of channel 1 and a TMDS data channel 2 transmits the at least one frame of image data, characterized in that the reverse data transmission procedure includes the following steps: the master device 210 outputs the data through the TMDS clock channel Clock signal and output the frame synchronization signal through TMDS data channel 0; when the slave device 220 detects that the frame synchronization signal exhibits an active state (such as a high potential) from the TMDS data channel 0, it switches to a transmission state, and then Under the control of the TMDS clock signal, TMDS data channel 1 and/or TMDS data channel 2 transmits reverse data; and the master device 210 samples the reverse data according to the clock signal, wherein the reverse data has The synchronization header is used by the main device 210 to correctly parse out the reverse data.

In addition, the reverse data transmission procedure occurs during at least one vertical blanking interval.

Preferably, the reverse data transmission procedure further includes a reverse transmission stop step, and the reverse transmission stop step may be: the master device 210 issues a command to the slave device 220 to stop the slave device 220 from transmitting. The reverse data; or after the frame synchronization signal is transmitted for a specified number of times to stop the slave device 220 from transmitting the reverse data, wherein the slave device 220 is obtained from a command issued by the master device 210 The specified number of times, or the specified number of times is preset in the slave device 220.

Preferably, the reverse data has a data tail for the main device 210 to end the receiving mode.

Preferably, the reverse data has a check code (such as (but not limited to) data mutual exclusion or operation result) for the host device 210 to verify the correctness of the reverse data.

In addition, considering the state reversal speed of the master device 210 and the slave device 220, after completing the reverse data transmission, the slave device 220 must first stop the sending state and immediately switch to the receiving state, and the slave device 220 is in the receiving state Next, all non-video data will be discarded in preparation for receiving the next frame of image data normally.

In addition, although the slave device 220 transmits the reverse data at the frequency of the clock signal provided by the master device 210, its data transmission rate may be lower than or equal to the frequency of the clock signal.

In addition, according to the above description, the present invention further provides a display device having the aforementioned communication system 200, and it can be a cathode ray tube display device, a digital light processing display device, a liquid crystal display, a light emitting diode display device, Organic light emitting diode display device, quantum dot light emitting diode display device, Mirco-LED display device or Mini-LED display device.

With the design disclosed above, the present invention has the following advantages:

1. The half-duplex data transmission method of the present invention can use the existing channels to perform reverse data transmission through the transmission gap of TMDS image data, so as to increase the amount of information transmission without increasing the hardware cost.

2. The communication system of the present invention can utilize existing channels for reverse data transmission to increase the amount of information transmission without increasing the cost of hardware by using the transmission gap of TMDS image data.

The case disclosed in this case is a preferred embodiment, and any part of the modification or modification that originates from the technical idea of this case and can be easily inferred by those skilled in the art, does not deviate from the patent scope of this case.

In summary, regardless of the purpose, means and efficacy of this case, it shows that it is very different from the conventional technology, and its first invention is practical and practical, and it does meet the patent requirements of the invention. I urge your review committee to investigate and give the patent as soon as possible. Society is for supreme prayer.

100, 210: main device

110, 220: slave device

200: Communication system

Step a: The master device outputs the clock signal through the TMDS clock channel and the frame synchronization signal through the first TMDS data channel

Step b: When detecting that the frame synchronization signal exhibits an active state from the first TMDS data channel, the slave device transitions to a transmitting state, and then under the control of the TMDS clock signal, the second TMDS data channel And/or the third TMDS data channel transmits reverse data

Step c: The master device samples the reverse data according to the clock signal, wherein the reverse data has a synchronization header for the master device to correctly parse the reverse data

FIG. 1 is a flowchart of an embodiment of a half-duplex data transmission method of the present invention. FIG. 2 is a schematic diagram of one operation of the method shown in FIG. 1. 3 is a block diagram of a communication system using the half-duplex data transmission method of FIG.

Step a: The master device outputs the clock signal through the TMDS clock channel and the frame synchronization signal through the first TMDS data channel

Step b: When detecting that the frame synchronization signal exhibits an active state from the first TMDS data channel, the slave device transitions to a transmitting state, and then under the control of the TMDS clock signal, the second TMDS data channel And/or the third TMDS data channel transmits reverse data

Step c: The master device samples the reverse data according to the clock signal, wherein the reverse data has a synchronization header for the master device to correctly parse the reverse data

Claims (11)

A half-duplex data transmission method for performing a forward data transmission procedure and a reverse data transmission procedure between a master device and a slave device, the forward data transmission program is used to transmit at least one frame picture Like data, it includes using a TMDS clock channel to transmit a clock signal, using a first TMDS data channel to transmit a frame synchronization signal, and using the first TMDS data channel, a second TMDS data channel, and a third TMDS data The at least one data channel selected by the group formed by the channels transmits the at least one frame of image data, characterized in that the reverse data transmission procedure includes the following steps: The master device outputs the clock through the TMDS clock channel Signal and output the frame synchronization signal through the first TMDS data channel; when the slave device detects that the frame synchronization signal exhibits an active state from the first TMDS data channel, it transitions to a transmission state and then clocks on the TMDS Under the control of the signal, reverse data is transmitted by the second TMDS data channel and/or the third TMDS data channel; and the master device samples the reverse data according to the clock signal, wherein the reverse data There is a synchronization header for the master device to correctly parse out the reverse data. The half-duplex data transmission method as described in item 1 of the patent application scope, wherein the reverse data transmission procedure occurs during at least one vertical blanking period. The half-duplex data transmission method as described in item 1 of the patent scope, wherein the reverse data transmission procedure further includes a reverse transmission stop step, which is a command given to the slave device by the master device Stop the slave device from transmitting the reverse data. The half-duplex data transmission method as described in item 1 of the patent application scope, wherein the reverse data transmission procedure further includes a reverse transmission stop step, which is performed after the frame synchronization signal is transmitted for a specified number of times The slave device stops transmitting the reverse data. The half-duplex data transmission method as described in item 4 of the patent application scope, wherein the slave device obtains the specified number of times from a command issued by the master device, or the specified number of times is preset in the From the device. The half-duplex data transmission method as described in item 1 of the patent application range, wherein the reverse data has a data tail for the master device to end the reception mode. The half-duplex data transmission method as described in item 1 of the patent application scope, wherein the reverse data has a check code for the master device to verify the correctness of the reverse data. A communication system has a master device and a slave device, and can perform a forward data transmission program and a reverse data transmission program between the master device and the slave device, the forward data transmission program is used to Transmitting at least one frame of image data, which includes using a TMDS clock channel to transmit a clock signal, using a first TMDS data channel to transmit a frame synchronization signal, and using the first TMDS data channel, a second TMDS data channel and At least one data channel selected by a group consisting of a third TMDS data channel transmits the at least one frame of image data, characterized in that the reverse data transmission procedure includes the following steps: The master device passes the TMDS The clock channel outputs the clock signal and outputs the frame synchronization signal through the first TMDS data channel; the slave device switches to a transmission state when it detects that the frame synchronization signal exhibits an active state from the first TMDS data channel, Then under the control of the TMDS clock signal, reverse data is transmitted by the second TMDS data channel and/or the third TMDS data channel; and the master device samples the reverse data according to the clock signal, wherein, The reverse data has a synchronization header for the master device to correctly parse the reverse data. The communication system according to item 8 of the patent application scope, wherein the reverse data transmission procedure occurs during at least one vertical blanking period; the reverse data transmission procedure further includes a reverse transmission stop step, It is to stop the slave device from transmitting the reverse data by issuing a command to the slave device from the master device, or to stop the slave device from transmitting the reverse data after the frame synchronization signal is transmitted a specified number of times. To the data, wherein the slave device is obtained the specified number of times from a command issued by the master device, or the specified number of times is preset in the slave device. The communication system according to item 8 of the patent application scope, wherein the reverse data has a data tail for the master device to end the receiving mode, and/or the reverse data has a check code for the The master device verifies the correctness of the reverse data. A display device having the communication system as described in any one of the patent application items 8-10, and which is composed of a cathode ray tube display device, a digital light processing display device, a liquid crystal display, and a light emitting diode display device , A display device selected by the group consisting of an organic light-emitting diode display device, a quantum dot light-emitting diode display device, a Mirco-LED display device, and a Mini-LED display device.

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