KR20040035110A - Method and apparatus for detecting connection condition between transmitter and receiver - Google Patents

Abstract

PURPOSE: A method and a device for detecting a connection state between transmission and receiving apparatuses are provided to directly connect a port of detecting connection of a receiver to an interrupt pin port of a controller, and to generate an interrupt only when a pin level of the port of detecting connection of a receiver is changed, therefore periodic access to a detection register for detecting a connection state is not required. CONSTITUTION: When power is supplied to a host apparatus, a host controller initializes values of all kinds of registers thereof to provide a reset mode(401). The host controller decides whether a logic state of a voltage of a detection port directly connected to an interrupt pin port thereof is changed from a low state to a high state(402). If the logic state is changed from a low state to a high state, the host controller reads information stored in a detection register built therein to apply a detection interrupt for checking a connection state(403). And the host controller executes a next task according to an applied result of the detection interrupt or by a set mode(404).

Description

Method and apparatus for detecting connection condition between transmitting and receiving devices {Method and apparatus for detecting connection condition between transmitter and receiver}

The present invention relates to a method and apparatus for controlling a transmitting / receiving device, and more particularly, to a method and apparatus for detecting a connection state between transmitting / receiving devices for efficiently determining a connection state between transmitting / receiving devices while minimizing a burden on a control process. will be.

In the signal processing system, an example of a transmitting / receiving device may include a transmitter as a set-top box and a receiver as a display device. In this case, the set-top box is operated as a host device.

As shown in FIG. 1, a general transmitting / receiving device according to the related art is composed of a host device 100 and a display device 110 corresponding to a receiver, and in detail, the host device 100 includes data with a network. A network interface unit (NIU) 100-1 for interfacing transmission and reception, a host signal processing unit 100-2 for executing signal processing for converting received data in accordance with an input specification of a display device, and data in accordance with a DVI standard. And converts and transmits, and comprises a DVI transmitter 100-3 for determining the connection state of the receiver and a host controller 100-4 for collectively controlling the constituent means of the host. The display apparatus 110 is a DVI standard. DVI receiver 110-1 for receiving data from a transmitter in accordance with the present invention, and a signal destination for converting a signal standard in accordance with an output specification of a display means. A display control unit 110-4 for collectively controlling the display signal processing unit 110-2, the plasma display panel (PDP), the liquid crystal display panel, the CRT, and the like, and the display device for executing the display. It consists of.

The host device 100 and the display device 110 are connected to a plurality of data lines, clocks, and detect lines according to the DVI standard.

The DVI transmitter 100-3 transmits a signal in accordance with a DVI (Digital Visual Interface) standard, and in particular, executes a process of determining a connection state with the display apparatus 110 serving as a receiver.

That is, a method for detecting a connection state of a receiver according to the related art, which is executed by the DVI transmitter 100-3, will be described below with reference to the flowchart shown in FIG. 2.

First, when power is supplied to the host, values of respective registers of the host are initialized (step 201).

The detection register is then periodically accessed using I ² C to determine the connection state with the receiver (step 202). Here, the detection register is a register having information indicating that the detection port of the transmitter and the detection port of the receiver are connected to and disconnected from the detection line.

Accordingly, it is determined whether the receiver is connected or not with the information accessed in the detection register (step 203).

If it is determined in step 203 that the receiver is determined to be connected, it executes the next task that is set (step 205). Thereafter, the detection register is repeatedly accessed (step 204).

Accordingly, if the I ² is the chip when writing handing as the C line and the other chip (chip) this time using the I ² C longer or had a problem often affects the performance by using.

For example, in the case of sharing the detection register I ² C line with a caption chip, a receiver connection detection process that periodically checks the detection register may not extract caption data in time, which may cause broken text. do.

In addition, when the user quickly turns on / off the power of a display device, which is a receiver, or depending on the display device, the chip embedded in the DVI receiver 110-1 may be reset. If the interval is short, it may occur during the waiting time of step 204. In this case, it is not possible to detect the disconnection state of the receiver accurately, so that the encryption that was in progress when the chip of the DVI receiver 110-1 is reset and authentication must be executed again from the beginning. There may be a problem that an error occurs.

The technical problem to be solved by the present invention is to detect the connection state by generating an interrupt only when the pin level of the receiver connection detection port is changed by connecting the receiver connection detection port directly to the interrupt pin port of the controller in order to solve the above problems. The present invention provides a method and apparatus for detecting a connection state between transmitting and receiving devices.

1 is a configuration diagram of an apparatus to which a connection state detection method between transmission and reception apparatuses according to the related art is applied.

2 is a flowchart illustrating a connection state detection method between a transmitting and receiving device according to the related art.

3 is a configuration diagram of an apparatus to which a method for detecting connection state between transmitting and receiving devices according to the present invention is applied.

4 is a flowchart illustrating a method for detecting a connection state between transmitting and receiving devices according to the present invention.

In order to achieve the above technical problem, the method for detecting a connection state between a transmitter and a receiver according to the present invention includes a circuit design method of a transmitter and a receiver, the detection port for detecting an electrical connection state of the transmitter and the receiver interrupting the control Direct connection to the pin port is designed to generate an interrupt for executing a transmitter / receiver connection detection process corresponding to a change in logic state of the detection port voltage.

In order to achieve the above technical problem, an apparatus for detecting a connection state between a transmitter and a receiver according to the present invention is a device for detecting a connection state between a transmitter and a receiver, and the apparatus for detecting an electrical connection between the transmitter and the receiver is performed. A detection port for connecting a receiver to a line and a direct connection of the detection port to an interrupt pin port, and a control unit for executing a transmitter / receiver connection detection process corresponding to a change in the logic state of the interrupt pin port. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, a transmission / reception device to which a connection state detection device between transmission / reception devices according to the present invention is applied includes a transmission device 300 and a reception device 310 corresponding to a host device.

In detail, the transmission device 300 includes a network interface unit (NIU) 300-1, a host signal processing unit 300-2, a DVI transmitter 300-3, and a host controller 300-4. Numeral 310 is composed of a DVI receiver 310-1, a display signal processor 310-2, a display means 310-3, and a display controller 310-4.

The network interface unit (NIU) 100-1 is composed of hardware and software for interfacing data transmission and reception from a network such as the Internet, a cable broadcasting network, a satellite broadcasting network, and the host signal processing unit 100-2 is received from a network. Signal processing for converting data according to an input specification of a display device is performed. The DVI transmitter 300-3 includes pin ports in accordance with a DVI (Digital Visual Interface) standard, and the host signal processor 300-2. A process of transmitting the processed signal in accordance with the transmission standard is executed. The DVI interface pin port includes a detection port for detecting an electrical connection state of the transmitting device 300 and the receiving device 310.

The host controller 300-4 controls the transmitting device as a whole, and in particular, directly connects the detection port included in the DVI interface pin port to the interrupt pin port of the host controller 300-4, thereby changing the logic state of the detection port voltage. Control to generate an interrupt for executing the corresponding transmitter / receiver connection detection process. That is, the host controller 300-4 checks the connection state by reading information stored in the detection register indicating the connection state with the receiving device 310 only when the logic state of the voltage level of the detection port changes to a predetermined logic state. Control to generate an interrupt for

The reception device 310 is an example of a display device that processes a received signal and outputs the received signal to a display means.

The DVI receiver 310-1 receives data from the transmitting device 300 according to the DVI standard, and the display signal processor 310-2 transmits the data received from the DVI receiver 310-1 to the output specification of the display means. Signal processing for converting the standard of the signal is performed in accordance with the above. The display unit 310-3 is composed of a plasma display panel (PDP), a liquid crystal display panel, a CRT, and the like and finally outputs a signal processed image signal to a screen.

The display controller 310-4 collectively controls the display device, which is a receiving device.

The transmitting device 300 and the receiving device 310 have a detection port, various data ports, a clock port, etc. for detecting an electrical connection state between the transmitting device and the receiving device according to the DVI standard.

Next, a method of detecting a connection state between transmitting and receiving devices according to the present invention executed by the host controller 300-4 will be described in detail with reference to the flowchart of FIG. 4.

First, when power is supplied to the host device 300, the values of various registers of the host control unit 300-4 are initialized, and a reset mode is executed (step 401).

After the host device 300 is initialized, it is determined whether the logic state of the detection port voltage directly connected to the interrupt pin port of the host controller 300-4 transitions from a low state to a high state (step 402). According to an embodiment of the present invention, when the voltage of the detection port is in a low state, it indicates that an electrical connection is made with a receiving device. In the high state, an electrical connection with a receiving device is not made. Indicates.

As a result of the determination in step 402, when the logic state of the detection port voltage directly connected to the interrupt pin port of the host controller 300-4 transitions from a low state to a high state, the connection state with the receiving device 310 is established. A detection interrupt for checking the connection status is executed by reading the information stored in the detection register (not shown in the figure) built in the host control unit 300-4 (step 403).

Then, the next task is executed according to the detection interrupt execution result of step 403 or according to the set mode.

In this way, the information stored in the connection state detection register is stored only when the logic state of the voltage level of the detection port directly connected to the interrupt pin port of the host controller 300-4 changes to a logic state indicating electrical disconnection of the receiving device. By generating an interrupt for reading and confirming the connection state, it is not necessary to periodically access the detection register by using I ² C to determine the connection state with the receiving device as in the prior art. As a result, the chips connected to the I ² C line periodically reduce the allocation time for confirming the detection state with the receiving device, thereby enabling efficient data processing.

The invention can be practiced as a method, apparatus, system, or the like. When implemented in software, the constituent means of the present invention are code segments that necessarily perform the necessary work. The program or code segments may be stored in a processor readable medium or transmitted by a computer data signal coupled with a carrier on a transmission medium or network. Processor readable media includes any medium that can store or transmit information. Examples of processor-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, E ² PROMs, floppy disks, optical disks, hard disks, optical fiber media, radio frequency (RF) networks, and the like. Computer data signals include any signal that can propagate over transmission media such as electronic network channels, optical fibers, air, electromagnetic fields, RF networks, and the like.

Specific embodiments shown and described in the accompanying drawings are only to be understood as an example of the present invention, not to limit the scope of the invention, but also within the scope of the technical spirit described in the present invention in the technical field to which the present invention belongs As various other changes may occur, it is obvious that the invention is not limited to the specific constructions and arrangements shown or described.

As described above, according to the present invention, the receiving device connection detection port is directly connected to the interrupt pin port of the controller to check the connection state with the receiving device only when the voltage level of the detection port changes to a level indicating electrical disconnection. as by controlling so as to generate an interrupt, using a periodically I ² C, as in the prior art to periodically access the detection resistor is no need to grasp the connection state of the receiving apparatus first to, I ² C line By this, the allocation time for checking the detection state with the receiving device is reduced periodically, so that the effect of efficient data processing can be executed. Second, the effect of accurately identifying the timing of connection and disconnection using interrupts is generated. do.

Claims (4)

In the connection state detection method of the transmitter and the receiver, A detection port for detecting an electrical connection state between the transmitter and the receiver is directly connected to an interrupt pin port of a controller to generate an interrupt for executing a transmitter / receiver connection detection process corresponding to a change in logic state of the detection port voltage. Designed to make a connection state detection method between the transmitter and receiver equipment. The method of claim 1, wherein the transmitter / receiver connection detection process generates an interrupt for reading the information stored in the connection state detection register only to confirm the connection state only when the logic state of the voltage level of the detection port is changed to a predetermined logic state. Designed to make a connection state detection method between the transmitter and receiver equipment. An apparatus for detecting a connection state of a transmitter and a receiver, A detection port for connecting a transmitter / receiver in line to sense an electrical connection state of a transmitter and a receiver; And And a control unit for directly connecting the detection port to an interrupt pin port and executing a transmitter / receiver connection detection process corresponding to a change in the logic state of the interrupt pin port. . 4. The interrupt receiver according to claim 3, wherein the transmitter / receiver connection detection process reads information stored in the connection state detection register and checks the connection state only when the logic state of the voltage level of the detection port is changed to a predetermined logic state. Connection state detection device between the transmitter and the receiver, characterized in that the generation.