KR20030052474A - A method and a device of termination for common bus - Google Patents

Abstract

PURPOSE: A termination device of a common bus structure and a method for controlling the same are provided to improve an electric property of various kinds of signals from each circuit board and transmit data at high speed by mounting termination devices in a plurality of slave boards, and operating a termination device in only one slave board of the final position by a control of a master board. CONSTITUTION: A mother board(15) has lines for transmitting various kinds of signals including a clock signal, an address signal, a data signal, and a control signal. The mother board(15) mounts a plurality of circuit boards. A master board(25) controls, monitors, and arbitrates a flow of various kinds of signals being transmitted to the circuit boards mounted in the mother board(15). The master board(25) controls signal flows of a plurality of slave boards. The slave boards convert a state of an integrally mounted termination device into an enable state or a disable state by a relay. The master board(25) receives a mounting signal from the connected slave boards and outputs a termination control signal to a slave board mounted at the last position.

Description

Termination device of common bus structure and its control method {A METHOD AND A DEVICE OF TERMINATION FOR COMMON BUS}

The present invention relates to a termination function of a circuit card using a common bus, and more particularly, to a termination function regardless of the number of circuit cards fastened to the common bus.

The system equipment consists of a number of circuit cards or units that individually perform their own functions, and each circuit card has a clock, address, control signal and data signal according to a common standard. It is easy to design and change, and simple to update and expand by adopting common input / output terminal that transmits and receives.

The interconnection of the data terminals of each circuit card as described above is a motherboard or a back plane, and the motherboard includes one master board and a plurality of slave boards. ) Are fastened and interconnected.

The master board has the function and authority of control, control, arbitration and monitoring of all signal flows and operations of the multiple slave boards connected to the mother board, and each slave board has the master board. Perform data communication under the control of.

As described above, a motherboard to which one master board and a plurality of slave boards are coupled is provided with a common bus through which a clock, an address, a control signal, and a data signal are transmitted as described above. It occurs between each slave board by monitoring and control.

Various signals transmitted from the master board to each slave board need to be terminated or terminated after all are transmitted to the plurality of slave boards.

Hereinafter, a terminal device of a common bus structure according to the prior art will be described with reference to the accompanying drawings.

1 is a view illustrating a connection state of a master board, a slave board, and an end device of a common bus structure according to an example of the prior art, and FIG. 2 is a common state according to another example of the prior art. This is the connection status of master board, slave board and terminator of bus structure.

1 and 2, a circuit board connection of a common bus structure according to the prior art includes a back plane or a back plane forming a common bus that is commonly applied to all connected circuit cards. With Mother Board (10).

By being connected to the motherboard 10, the master board (20) for controlling, monitoring and mediating the operation of another circuit board (Circuit Board) or unit (Unit),

A plurality of slave boards 30 connected to the motherboard 10 and controlled and arbitrated by the master board 20 to perform respective assigned functions and to transmit and receive data signals with other circuit boards 30. )Wow,

Terminating the signals output from the master board and the slave board while being connected to the motherboard 10 facilitates the transmission of the generated signals and prevents noise from flowing from the outside. It is configured to include a terminal device 40 connected to one end.

A terminating device of a common bus structure according to the related art having the above configuration will be described in detail with reference to FIGS. 1 and 2.

Referring to FIG. 1, the motherboard 10 includes only a common bus for transmitting data signals, clock signals, control signals, and address signals, and the common bus of the motherboard 10 as described above. One master board 20, a plurality of slave boards 30, and one end device 40 are connected to each other.

The terminal device 40 as described above is fixedly connected to one end of the opposite side of the master board 20 connected to the motherboard 10, the master board 20 and the terminal device 40 of the motherboard 10 ), A plurality of slave boards 30 are connected.

1 is a diagram illustrating a state in which all the circuit boards that can be mounted on the motherboard 10 are mounted, such that one master board 20, a terminal device 40, and multiple or n slave boards 30 are installed. It is composed of

For example, if n is 16, in FIG. 1, 16 slave boards 30 are connected to the motherboard 10, and various signals output from the master board 20 are transferred to the 16 slave boards 30. It is applied to the terminal at the same time is terminated by the termination device 40, the various signals output from the plurality of slave boards 30 is also applied to the other slave board 30 or the master board 20 at the same time the termination device 40 Terminated by

The terminator 40 functions to ensure that various signals output from each circuit board are correctly transmitted to the circuit board of the transmission destination, and at the same time, a noise signal is applied from the outside and cannot be input to each circuit board.

Referring to FIG. 2, the master board 20 controls, monitors, and arbitrates a plurality of slave boards 30 on the motherboard 10, and controls, monitors, and mediates the master board 20. By way of example, two slave boards 30 are provided, and the terminal device 40 is provided at one end.

Referring to FIG. 2, the slot 10 into which the 14 slave boards 30 can be inserted is empty in the motherboard 10 into which the 16 slave boards 30 can be inserted as in the above example. Termination device 40 is provided at the last end in the terminal device 40, the various signals output from each circuit board is transmitted to the destination circuit board while at the same time a noise signal from the outside is applied to each circuit board It is a function to prevent it.

However, there is a common bus of a constant length that is formed unnecessarily to the slave board 30 connected to the motherboard 10 and the terminal device 40 provided at the end, and by the unnecessary bus formed as described above There is a problem that distortion occurs in a signal output from each circuit board and transmitted.

In addition, the communication bus (Band Width) is limited by the unnecessary common bus as described above, and there is a problem that data cannot be transmitted at high speed.

The present invention provides a plurality of slave boards each having a terminal device fixedly disposed at the end of the motherboard, and by controlling the master board to operate the terminal device only at the slave board in the final position, the output from each circuit board It is an object of the present invention to provide an end device and a control method thereof that enable high-speed transmission of data while improving electrical characteristics of signals.

The present invention devised to achieve the above object is an apparatus for interconnecting a plurality of circuit boards using a common bus; A mother board including a clock signal, an address signal, a data signal, and a control signal and integrally provided with a line for transmitting a plurality of circuit boards; A master board for controlling, monitoring, and arbitrating the flow of various signals transmitted between the plurality of circuit boards mounted on the motherboard; The signal flow is controlled by the control of the master board, and a plurality of slave boards are configured to switch an integrated terminal device to an enable or disable state by a relay.

The present invention also provides a method for controlling a terminal device of multiple circuit boards using a common bus; A mounting confirmation process of receiving a mounting signal from each slave board by a master board for monitoring, controlling and arbitrating the plurality of circuit boards; A position determination process of determining whether or not the slave board on which the mounting is confirmed in the above process is the slave board of the last position mounted at the longest distance from the master board; In the case of the slave board in the last position as determined in the above process, the terminal device is characterized in that it comprises a termination process for operating the termination device by applying the termination control signal.

1 is a diagram illustrating a connection state of a master board, a slave board, and an end device of a common bus structure according to an example of the related art;

2 is a diagram illustrating a connection state of a master board, a slave board, and an end device of a common bus structure according to another example of the related art;

3 is a state configuration diagram in which a master board and a slave board according to an embodiment of the present invention are mounted on a motherboard;

4 is a state diagram of the control signal transmission state of the terminal board and the slave board according to the present invention,

5 is a detailed functional configuration diagram of a slave board according to the present invention;

6 is a flowchart illustrating a method for controlling an end device of a common bus structure according to the present invention.

** Explanation of symbols on the main parts of the drawing **

10,15: Motherboard 20,25: Master Board

30,50: Slave board 40,45: Terminator

52: circuit part 54: relay

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a terminal device of a common bus structure and a control method thereof according to the present invention will be described with reference to the accompanying drawings.

3 is a state configuration diagram in which a master board and a slave board according to an example of the present invention are mounted on a motherboard, and FIG. 4 is a termination of the master board and the slave board according to the present invention. 5 is a detailed functional configuration diagram of a slave board according to the present invention, and FIG. 6 is a flowchart of a method for controlling an end device of a common bus structure according to the present invention.

3 to 5, the terminal device of the common bus structure according to the present invention is a device for interconnecting a plurality of circuit boards using a common bus,

Motherboard which is equipped with a line for transmitting various signals including clock signal, address signal, data signal and control signal, and mounts a plurality of circuit boards. (Mother Board) (15),

By controlling, monitoring, and arbitrating the flow of various signals transmitted between a plurality of circuit boards mounted on the motherboard 15, the motherboard 15 is connected to the motherboard 15. The master board 25 receives the mounting signal SLAVE EJECT (N) from the connected slave boards 50 and outputs the termination control signal TERM EN (N) to the slave board mounted at the last position. ,

The signal flow is controlled by the control of the master board 25 and at the same time, the terminal is integrally provided with the relay to enable or disable by a relay, thereby enabling A circuit unit 52 connected to the board 15 and performing respective assigned functions to transmit and receive a corresponding data signal and output a mounting signal SLAVE EJECT (N) to the master board 25; A relay (54) for switching on and off (ON OFF) by a termination control signal (TERM EN (N)) applied from the master board 25; The relay 54 is configured to include a plurality of slave boards 50 which are connected to the motherboard 15 by the on-off switching of the relay 54 and the termination device 45 terminates the various signals.

In addition, referring to the attached Figure 6, according to the present invention, the method of controlling the terminal device of the common bus structure, in the terminal device control method of the multiple circuit board (Circuit Board) using a common bus,

Receiving a mounting signal (SLAVE EJECT (N)) from each slave board 50 by the master board 25 for monitoring, controlling and arbitrating the multiple circuit boards. Mounting check process (S10),

The position determination process (S20) for determining whether the slave board 50 has been mounted in the mounting confirmation process (S10) is the slave board 50 of the last position mounted at the longest distance from the master board 25;

In the case of the slave board 50 at the last position as determined in the position determination process (S20), a termination process (S30) for applying the termination control signal (TERM EN (N)) to operate the terminal device 45 is included. It is a configuration made.

Hereinafter, according to the present invention having the above-described configuration, a termination device of a common bus structure and a control method thereof will be described in detail with reference to FIGS. 3 to 6.

The motherboard 15 according to the present invention comprises a common bus through which various signals such as a clock signal, a data signal, a control signal, an address signal are transmitted, and a circuit board of any function is not fixedly attached to one end. A plurality of slots are provided to allow the plurality of circuit boards to be easily detached and interconnected.

One master board 25 and a plurality of slave boards 50 are fastened and electrically connected to the slots of the motherboard 15 having the above configuration.

The master board 25 receives the mounting signal SLAVE EJECT (N) as a high level signal from a plurality of slave boards 50 connected to the motherboard 15, thereby confirming whether or not it is mounted. Check the position of the slave board 50 mounted in the farthest position.

The slave board 50 identified as the farthest slave board 50 receives a high level termination control signal TERM EN (N) output from the master board 25 and receives a relay ( 54).

When the relay 54 receives the termination control signal TERM EN (N) of a high level, the relay 54 is switched to an on state, thereby providing the termination device 45 to the motherboard 15. ) And simultaneously terminate the various signals.

Referring to the above process in more detail, the master board 25 receives the mounting signal (SLAVE EJECT (N)) from the plurality of slave boards 50 connected to the motherboard 15, and analyzes the signal. By doing so, check the slave board 50 mounted in the last position (S20).

When the master board 25 is identified as the slave board 50 mounted at the last position as described above, the master board 25 is terminated control signal to the slave board 50 identified as the board of the last position as described above By outputting (TERM EN (N)), the relay 54 of the slave board 50 is switched ON, and the terminating device 45 is connected to the motherboard 15. The signal is terminated to prevent distortion of the signal and high-speed data transmission is possible because the communication band is not restricted.

Therefore, the present invention having the above configuration, the slave board 50 mounted in the last position of the slave board 50 mounted in a plurality of slots (Slot) configured in the motherboard 15, and the corresponding slave board Let the terminator operate at 50.

In addition, even when a small number of slave boards 50 are mounted on the motherboard 15, various signals transmitted through the common bus can be transmitted at high speed without being distorted during transmission, and the external noise is prevented from being applied. This is,

In particular, the present invention having the configuration described above, when the number of slave boards 50 is mounted on the motherboard 5, its utility is increased and it is easy to expand and expand.

According to the present invention having the above configuration, when a few slave boards are mounted on a motherboard mounting a plurality of circuit boards, the terminal device is performed in the last mounted slave board so that the transmitted signal is not distorted, There is an effect that can transmit data.

In addition, when a small number of slave boards are mounted on the motherboard, the terminal device can be performed on the last slave board, thereby simplifying the configuration of the system device and easily expanding and expanding the system.

Claims (4)

In a device for interconnecting a plurality of circuit boards using a common bus, A motherboard integrally provided with a line for transmitting various signals including a clock signal, an address signal, a data signal, and a control signal, and mounting a plurality of circuit boards; A master board that controls, monitors and mediates the flow of various signals transmitted between a plurality of circuit boards mounted on the motherboard; The control method of the master board includes a plurality of slave boards for controlling the flow of signals and simultaneously switching the terminal devices integrally provided to enable or disable states by a relay. Terminator. The method of claim 1, wherein the master board, Terminating device of a common bus structure, characterized in that for receiving a mounting signal from a plurality of slave boards connected to the motherboard, and outputs a termination control signal to the slave board mounted at the last position. The method of claim 1, wherein the slave board, A circuit unit connected to the motherboard and performing a function assigned to each other to transmit and receive a corresponding data signal and to output a mounting signal to the master board; A relay for switching on and off by a termination control signal applied from the master board; Terminating device of the common bus structure characterized in that it comprises a termination device connected to the motherboard by the on and off switching of the relay termination. In the terminal device control method of multiple circuit board using a common bus, A mounting confirmation process of receiving a mounting signal from each slave board by a master board for monitoring, controlling and arbitrating the multiple circuit boards; A position determination process of determining whether the slave board whose mounting is confirmed in the above process is the slave board of the last position mounted at the longest distance from the master board; In the case of the slave board of the last position determined in the above process, the terminal device control method of the common bus structure, characterized in that it comprises a termination process for applying the termination control signal to operate the terminal device.