KR20030092505A - Breadboard System for Semiconductor Experiment - Google Patents

Abstract

PURPOSE: A breadboard system for testing a semiconductor is provided to construct an electronic circuit, and to test the electronic circuit over the internet or on a standalone computer. CONSTITUTION: The system comprises a GUI(Graphic User Interface, 11), a semiconductor chip/line generator(3), a circuit design module(4), an ERC(Electric Rule Checker, 5), an IO processor(6), a network(7), a locking module(8), a processor(9), a server(10), and a semiconductor chip addition module(12). The GUI(11) includes an event processor(1) and a display(2). The event processor(1) processes all the events generated while a user is using the system. The display(2) receives the data from the event processor, and graphically displays the received data. The semiconductor chip/line generator(3) generates a semiconductor chip or line if a corresponding event is generated, and transmits the generated semiconductor chip or line to the circuit design module(4). The ERC(5) detects electric rules of the designed circuit, sets a connection relation of each semiconductor chip if there is no error in the designed circuit, and offers the connection relation data to the processor(9). The locking module(8) prevents a file on the designed circuit from being copied. The processor(9) calculates an output value according to an input of each element when a simulation is performed, and transmits the simulation result to the GUI(11).

Description

Breadboard System for Semiconductor Experiments {.}

Digital electronic circuit experiment using a semiconductor chip consists of a hardware breadboard and a semiconductor chip (chip) to configure the circuit and perform simulation to check the result value. In other words, since it is configured to perform the experiment only offline, it is necessary to purchase an experimental device and a semiconductor chip, and due to the cost of purchasing the electronic circuit experimental device, it is difficult to experiment with one experimental device per student. As a result, experiments in group units are performed, and new semiconductor chips are generated or damaged semiconductor chips must be purchased again according to the experiment. In addition, the experimental subjects are excluded from the field of virtual education because it is difficult to implement the hardware experiments on the Internet and to make the implemented experiments have the same effect as the off-line experiments.

In addition, when such an electronic circuit experiment is performed, and after the same experiment again, or if further expansion or change in the same experiment, there is a cumbersome problem of having to decorate the electronic circuit from the beginning again.

Therefore, in order to solve the above problems, an object of the present invention is to implement an electronic circuit experiment using a breadboard, which is a hardware experiment apparatus, on a computer to have the same effect as an experiment performed on-line or off-line in an independent computer.

Therefore, in the present invention, by simplifying the interface of the device is configured to easily add a semiconductor chip or a microprocessor, using the breadboard system of the present invention when the electronic circuit after the experiment and the same electronic experiment or designed circuit expansion In this case, it can be saved as a file in the computer's hard disk or in the server's hard disk to make it easy to modify or expand the electronic circuits and save the name and ID at the same time when the file is saved to the hard drive. Also, when loading the file, it is not possible to modify the name and ID of the file so that no one else can modify the file except for the file he / she created, and the purpose is to induce individuals to experiment with electronic circuits. have.

1 is a block diagram of an overall device of the present invention

2 is an overall flow chart of the system according to the present invention.

2A is an overall device block diagram in accordance with the present invention.

3 is a flow chart of starting the system of the present invention via the Internet.

3A is a flow chart of starting the system with the client alone

4 is a diagram of a modeled device

4A is an internal view of a modeled semiconductor chip

5 is a flowchart for displaying a semiconductor chip on a screen;

5A is a flow chart for moving a semiconductor chip in a system of the present invention.

5B is a line drawing flowchart connecting the semiconductor chip and the semiconductor chip.

6 is a simulation flow chart in accordance with the present invention.

7 is a flowchart for storing / loading an electronic circuit created in a client.

8 is a flowchart for storing / loading an electronic circuit created in a server.

9 illustrates one embodiment of implementing a system in accordance with the present invention.

10 illustrates an embodiment of implementing an electronic circuit according to the present invention.

11 shows a window for entering a password and a file name for storing a file in a server.

FIG. 12 is an embodiment for explaining the semiconductor chip shown when the displayed TTL7408 chip on the electronic circuit is clicked using the question mark button 100 in the embodiment of the present invention.

<Description of the reference numerals for the main parts of the drawings>

1 ... Event processing part 2 ... Display part 3 ... Semiconductor chip / line generating part 4 ... Circuit design part 5 ... ERC part 6 ... I / O processor part 7 ... Network part 8 ... Copy protection section 9 ... Processor section 10 ... Server 12 ... Semiconductor chip addition section

The present invention is a system configured to perform an electronic circuit experiment using a breadboard on-line or on an independent computer. The semiconductor chip is generated by creating a semiconductor chip, such as an electronic circuit experiment using a breadboard device off-line. It is a system that can be experimented on the internet or a separate computer.

Hereinafter, the detailed description will be given with reference to the accompanying drawings.

1 is a diagram schematically showing a relationship between an instructor (server manager), a user (student or learner), and a server according to the present invention. The instructor stores the system of the present invention in a server, and the user accesses the server using the Internet or a network, runs the system of the present invention, constructs an electronic circuit for experiments, and stores the electronic circuit used in the experiment in the server. do. The instructor accesses the server after the learner ends the experiment and checks the electronic circuits saved by the learner.

The signals sent and received between each instructor, user, and server are as follows.

The S1 signal is a signal that the instructor adds to the experimental system in accordance with the semiconductor chip used in the experiment or the interface of the experiment or requests a file stored by the learner in the server.

The S2 signal is a signal for requesting the user to run the experiment system through the Internet or storing the circuit used in the experiment.

The S3 signal is a data transmitted to the learner's computer by the user's request signal.

The S4 signal is a signal requested by the instructor and transmits the electronic circuit stored by the user to the instructor's computer.

The overall system has a structure in which a server is connected between a user and an instructor to execute an experimental system, store a file, and transmit data corresponding to a signal required by the instructor and the user to each other. The above five simplified steps are illustrated and described for each step as follows.

In the first step, the system is executed on the Internet or an independent computer (hereinafter referred to as a 'local computer') for experimenting with electronic circuits. The data executed according to the user's system execution signal is stored in a memory and the electronic circuit is stored on the learner's monitor. This step displays the screen to configure.

In the second step, the learner constructs the circuit necessary for the experiment of the electronic circuit. There are two methods of the above method. The first is the user constructing the new circuit, and the other is already stored in the local computer or server computer. The process of modifying or expanding a circuit by loading an electronic circuit.

The third step is to test (simulate) the circuit configured in the second step. The test is performed by using a multimedia device provided by the system or a tracer device having a logic analyzer function.

Step 4 is a debugging step in which the problem circuit is corrected by using the results tested in step 3. If step 3 does not cause any problems during the test of the circuit, it is not necessary to perform it.

Step 5 is to check the desired result in step 3 or 4 and to store the experimental electronic circuit in the hard disk of the local computer or the hard disk of the server.

2A is an overall device block diagram in accordance with the present invention.

Referring to the block shown in the drawings as follows.

GUI part 11: It is a part that is in charge of the interface with the user through the graphic, the event handler part 1 which processes all events occurring while the user uses the system and receives information from the processor and shows the related information to the user. There is a screen display unit 2.

Semiconductor chip / line generation unit 3: A portion for generating semiconductor chips and lines. When a semiconductor chip generation event or a line drawing event occurs, the semiconductor chip / line generation unit 3 is related to the circuit design unit 4 for designing a circuit by generating a semiconductor chip or line. Provide information.

Circuit design section 4: Designs an arbitrary circuit using the generated semiconductor chip.

ERC (Electric Rule Checker) part 5: This part checks the electrical rules of the designed circuit. When there is no error, the ERC (Connection Rule Checker) part sets the connection relationship of each semiconductor chip and provides information on the processor part.

I / O processor unit 6: performs file read / write and print functions in the I / O (input / output) processor unit.

Network unit 7: Connects to server and reads / writes files stored in server.

Copy protection unit (8): It is a device having a copy protection function to provide a lock function so that others cannot copy or modify the file by modifying the ID and name of the file designed in connection with the I / O processor.

Processor unit 9: In the simulation, the output value according to the input of each device is calculated and the result value is displayed to the user using the GUI unit.

Server 10: In association with the network portion of the client stores and loads files and transmits the program to the client.

Semiconductor chip adder 12: A semiconductor chip can be added, and if a user implements only a predetermined interface, the user can easily add or remove a semiconductor chip desired by the system.

Therefore, the present invention operates the system of the present invention in conjunction with the devices of the above block.

Such a system is usually driven by an event, the system of the present invention is also made by such an event, the generation event of the semiconductor chip, the generation event of the line (line), the storage / load event of the electronic circuit It is driven by system start / end and print events. The above-described event varies depending on the mode. In one embodiment, when the line drawing event is executed, the generation event of the semiconductor chip is not operated and is configured in the following modes.

Basic mode: It is a mode that can move, copy, and delete elements when designing a circuit. If the cancel button is pressed on the system, the right mouse button is double-clicked, or the device creation button is clicked, it is set to the default mode.

Line drawing mode: This mode is set when the line drawing button (wire button) is pressed in the system. It is a mode that can be connected by using lines between devices.

Help Mode: This mode is used to view the help for the device used in the system. It is set when the question mark button (? Button) on the top is pressed. When a specific device is clicked in the above mode, a help window for the device is created. do.

If the mouse is clicked, it checks whether it is the right button or the left button, and if it is the right button, it waits for the event signal, and if it is the left button, it checks whether it is a double click.

3 and 3A respectively show a method of executing a system, FIG. 3 is a data flowchart of a method of executing a system using the Internet, and FIG. 3A is a data flowchart of executing a system by a client alone.

In the case of executing the system using the Internet, when a program execution request signal 31 is received from the client 32 at the server, the server requests a class transfer capable of executing a program according to the signal, and the server responds. The program class 33 is then sent to the client. The client receiving the class (34) stores the class in its memory (35) and then receives all the classes (36) and executes the program (38) using a Java virtual machine (37). If it displays 39 on the user's monitor and class is not received, it requests class transfer to server again. In the above process, a class is a file that executes a system with a file name that executes a machine in Java language. In the embodiment of the present invention to be described below, since the example written in the Java language has been described, a file name of class is used in the above process, and thus the scope of the present invention is not reduced or limited.

When running as a standalone application, when the user executes the program (31a), the processor of the computer stores the class of the program in memory (32a) and then runs the system using a Java virtual machine (33a). 34a, the execution screen is displayed on the user's monitor 35a, and the system executes 36a.

In the present invention, modeling of the semiconductor chip is implemented using an object-oriented method. First of all, before describing the semiconductor chip, since the semiconductor chip is composed of a combination of logic elements, the logic element (hereinafter, simply referred to as “element”) will be described first. In the present invention, an element represents an input and an output. In order to make a payment, the input pin and the output pin and the input / output pin are implemented as a symbol. The input pin becomes an observer and an output pin becomes an observer object. That is, the input pin observes the output pin connected to itself and then informs the symbol of the changed value when the output pin value changes. When the symbol informs the user of the changed value on the input pin, the symbol uses the input value to calculate its new value and compares the calculated value with the nominal value of the output pin. When the compared values differ from each other, the logic value of the output pin is changed to the calculated value. When modeling a device using a symbol object whose value can calculate the input and output of the digital logic device and the state value of the device, the interface for the input / output and the symbol object is defined only when a new object is added. You can easily add the device you want.

The following source shows the source implemented in the Java language to implement the object-oriented device as described above.

Example of implementing output pin

class OutPin extends Observable

{

Symbol mother; // symbol containing this output pin

int state; // current value of this output pin

int state2; // state value of this output pin

OutPin (int i, Symbol s)

{state = i;

state2 = i;

mother = s; }

public void fixedoutport ()

{

if (state! = state2)

{state = state2;

setChanged ();

notifyObservers (this); }

public void setstate2 (int s)

{state2 = s;

} ......

}

Example of implementing an input pin

class InPin implements Observer

{

Symbol mother; // symbol that contains this input pin

int state; // value of this input pin

OutPin inconnto; // output pin of the symbol (device) to which this input pin is connected

InPin (int i, Symbol s)

{

state = i;

mother = s; }

public void update (Observable o, Object arg)

{state = ((OutPin) arg) .state;

mother.calcfunc (this); // call calcfunc () of the symbol containing this input pin

}

Example of implementing the symbol that is the center of the device

class XXX extends Symbol

{int delta = 1; // delay

XXX ()

{// default constructor

}

public void setup (String subpara)

{// Parsing the subpara string to get each subparameter

// Set member variables of XXX class. }

public String getsubpara ()

{// Gathers the subparameters into a string and returns. }

public void calcfunc (InPin inpin)

{// Describes the operation of the device when the value of the input pin object inpin changes.

// Output pin out [i] whose value is changed among the output pins executes the following routine.

// out [i] .setstate2 (z);

//scheduler.add(delta, out [i]); }

public void drawself (Graphics2D g2)

{// Routine to draw the shape of the device. }

public Symbol makebaby ()

{// Creates a new XXX object and copies each subparameter to create and return the same copy object.

}

}

The generator is managed in addition to the vector class variable allsymbols, which collects all the elements. The above code is a code used for modeling a digital device in an object-oriented manner, and may be implemented in any language as long as it is an object-oriented language, and is represented using the Java language in the present invention.

When adding a new device, a function that draws the shape of the device from the symbol object (drawself ()), a function that calculates a logical value using the input value of the device (calcfunc ()), and various variables required when creating the object If you implement a function (getsubpara (), setup ()), a function to copy the same device (makebaby ()), etc., you can add a device.

4 is a diagram modeling an input pin, an output pin, and a symbol configured as described above. Since the semiconductor chip is composed of a combination of elements (described below), it is preferable to describe an element composed of an input / output pin and a symbol for determining a logic value of the input / output pin rather than describing the semiconductor chip. The device will be described.

The input pin 41 observes the output pin of the pressing and transmits the logic value to the symbol 43. The symbol 43 calculates the logic value transmitted from the input pin to calculate the value of the output pin 42. Change it. In other words, it has an input pin 41 that serves as an observer, an output pin 42 that is an observer, and a symbol 43 that calculates the value of the input pin and transfers the calculated value to the output pin. The number of input pins and output pins can vary depending on the user creating the device. For example, in FIG. 4, the number of input pins and output pins is 2 and 1, respectively, but the number of output pins calculated according to the role of the device, that is, the output signal of the input pin and output may be configured differently according to the symbol. The number of input pins and output pins can be changed by those skilled in the art.

4A is a diagram illustrating a semiconductor formed by grouping devices into one unit.

Symbol that changes the value of the output by calculating the input pins 41 (1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B) and the output pins 42 (1Y, 2Y, 3Y, 4Y) and the input values Four elements of 43 are combined to form one semiconductor chip. In other words, a semiconductor chip is a collection of devices formed by combining several devices. A semiconductor chip made as described above (hereinafter, simply referred to as 'chip') is used in the present invention.

5 is a flowchart illustrating a display of a chip on a screen according to the present invention.

When the button for generating a chip is clicked (S51), the chip is searched for in the database of the corresponding chip (S52). For example, when a button for generating zero of a TTL semiconductor chip is clicked, a semiconductor chip of 74LS00 is searched, the found chip is loaded into a memory (S53), and the chip is displayed on the upper left side of the breadboard (S54).

There are TTL types of chips, and 7SEG (A, K) and tracer (TRACER) are also displayed according to the flowchart of FIG.

FIG. 5A is a flowchart for designating the position of the chip when the element displayed in FIG. 4 attempts to change the position according to the user's position adjustment.

Since the present invention implements a breadboard on a computer, when the user moves the displayed chip to a position where the chip cannot be positioned on the breadboard, the chip is returned to the position before the movement. Is adopted. In other words, when the chip is moved to the position where it can not be located, it is possible to specify the location of the chip by moving the chip to the original position. Referring to the flowchart shown in FIG. 5A, when the user clicks on a chip to be moved (S5a_1), the system activates the chip (S5a_2). The user drags the mouse to the position to be located by dragging the mouse (S5a_3) and releases the mouse button (S5a_4). The system searches for the position (S5a_5) and displays the chip moved from the position if the position is a position where the chip can be placed (S5a_7). The chip is reduced (S5a_6) to the position before the movement. This is the same as the process of experimenting with electronic circuits performed off-line, and it is the same principle that the chip does not fit on the breadboard board unless it coincides with the hole where the pin part of the chip and the pin of the breadboard are joined. . In the offline situation, when the user applies a random force to fit the chip on the breadboard, the chip pins may be bent or broken, but the above problem may be solved by using the system of the present invention. The chip is not disturbed by the overcurrent of the chip due to the internal error of the breadboard or other shocks caused by the user's handling of the chip.

After the chip is generated, it should be set to be linked to each chip through the connection of each chip in the present invention, the connection of each chip is configured to connect the chip by a mouse. In the above, the chip of the present invention is a collection of devices consisting of a combination of devices. However, it may be easier to describe a device that is a smaller unit, although it may be described as a chip. The description describes the device.

Line connections by mice are shown in Figure 5b. To connect a line, the LINE button must first be clicked on the system. When the line drawing button is clicked, the system enters the line drawing mode and connects the lines by clicking the right or left mouse button. First, when an event occurs in the system, when the line drawing mode is executed, it is first checked whether it is a right mouse click or a left mouse click (S61, S62).

The left button checks whether the counter is 0 (S61_1). If the counter value is 0, the first start point is drawn (S71_2) and the counter is incremented by 1 (S61_3). If the counter is not 0, the line is drawn in the line drawing mode, so the point immediately before the click is connected to the current point (S61_4). If the button is pressed, the right button (S62) checks whether the right button has been pressed twice in succession (S62_1). If the button is pressed once, the count value is set to 0 (S62_2), and the current line connection is terminated (S62_3). )do. In this state, the line drawing mode is maintained. When the right button is pressed continuously, the line connection while drawing is terminated (S62_4), the value of the counter is set to 0, the line drawing mode is released, and the operation is terminated (S62_5).

When the line drawing mode is released, the line is not connected even if the left button of the mouse is pressed.

If one electronic circuit is configured through the generation of the device or the line drawing to connect the devices, the simulation is performed accordingly. The simulation process is as follows.

The simulation is performed by the scheduler (described below). First, when the input pin value of the device changes, the input pin informs the user that the input value has changed in the symbol that is the main body of the device. The value is compared to the calculated value for the output pin. If the values compared with each other are different, the symbol signals to change the value of the output pin, and the output pin changes its digital value from the symbol to the changed value. If the symbol has the same value compared to the output pin, the value of the output pin does not change and the simulation of the devices connected to the output pin is stopped. This simulation is possible because the device is modeled in an object-oriented manner so that the device can operate independently as an input pin, an output pin, and a symbol object that becomes the body of the device. Simulation can also be described as a chip, but since a chip is also a collection of devices, it is described as a smaller unit.

A detailed procedure simulated after the circuit design is described in FIG. 6.

FIG. 6 illustrates a simulation process when a circuit is designed by connecting a combination of the above elements. First, the breadboard system of the present invention is designed to be similar to a breadboard used offline. If the chip is installed on the breadboard device board and the power is applied while the wire is connected, the chip may be damaged if the chip is removed from the breadboard device board or the wire is removed in the above state. In the present invention, the operation is performed to prevent the chip from being removed or the wire from being removed while the power is applied. In order to start the simulation, it is detected whether power is applied (S71), and when the power is applied, the chip and line are moved, that is, the circuit is not changed (S71_1).

Next, the simulation procedure is as follows.

In the first step, all existing connection information between lines is deleted, and a new connection state between all lines is checked (S72). That is, for all the lines, a line group S73 is formed by gathering lines where the end points of the lines are on the lines of the other lines or meet the end points of the other lines. Here, the line is defined as two points (x0, y0) and (x1, y1) and may have additional information such as color.

In the second step, the input pins and output pins of the devices connected to each line group are examined (S74) to find a pure output pin that provides an output to the line group (S75, S76). It is fixedly used as either a pin or an output pin, but in some cases it can also function as an input and output pin. In the case of a pin that serves as an input and an output (S75_1), it is necessary to distinguish whether it is used as an input or an output from the circuit diagram. Therefore, first check the pure input pin, pure output pin, and I / O pin connected to the line group (S75_2, S75_4). If two or more pure output pins are connected to one line group (S76_2), Process (S76_2). If only one pure output pin is connected (S76), the pure output pin is regarded as the real output pin of the corresponding line group (S76_0), and all the input / output pins connected to this line group are judged as input pins (76_1). )do. If none of the pure output pins are connected, check the number of I / O pins (S75_2, S75_4). If two or more I / O pins are connected, treat them as an error (S76_3). If only one is connected, the input / output pin is determined as a pure output pin (S75_5). If none of the input / output pins are connected, it is determined that there is no real output pin connected to this line group (S75_3).

The third step is to set the relationship between the real output pins and the input pins for each line group where the real output pins are found. That is, all input pins are registered as observers on the real output pin (observer) (S77). This allows the true output pin to notify all registered observers that it has changed its state value when its state value changes.

In conclusion, the ERC routine performs the function of detecting the electrical error by detecting the connection of the device pins, and constructs information on which output pin of which device is connected to which input pin of which device if there is no error. It performs the function. At this time, the output pin plays the role of observer, and if its value changes in concept, it informs all observers registered to itself, that is, all input pins connected to it, so that the value of input pin is equal to its value. .

Digital logic circuits generally perform specific logic functions when their input pin values change and change their output pin values accordingly. When the output pin value changes, the input pin value of the other device connected to this output pin changes. Therefore, when the output pin value of one device in the digital logic circuit changes, the influence propagates to all the connected devices in turn. This process is handled by introducing the following concept of scheduler.

First, the scheduler list (schedulerlist) of the scheduler is a list of output pin (OutPin) objects connected in order of processing time. To add an output pin object to the scheduler list, the add function of the scheduler is used.

The code below shows the scheduler in an object-oriented language, which is represented here using the Java language.

Scheduler code

class Scheduler

{

Logic Sim Canvas mother;

int simtime = 0;

LinkedList schedulerlist;

Scheduler (LogicSimCanvas m)

{

mother = m;

schedulerlist = new LinkedList ();

}

public void startscheduler ()

{

while (schedulerlist.size ()> 0)

{SchedulerNode temp_node = (SchedulerNode) (schedulerlist. RemoveFirst ());

simtime = temp_node.time;

((OutPin) (temp_node.object)). Fixedoutport ();

}

}

simtime = 0; // initialize

}

public void add (int delta, Object o)

{SchedulerNode newnode = new SchedulerNode (simtime + delta, o);

schedulerlist.add (newnode); // Insert according to chronological order

}

The scheduler takes the output pin objects one by one until the scheduler list is empty and calls the output pin object's fixedoutport function. The fixedoutport function of the output pin object compares its current state with the next state (state2), and if it is different, stores the next state in the current state and all observers registered to it by using the notifyObservers function. Notifies the user that his status has changed. Notifying all registered observers here means calling the update function of all the input pin (InPin) objects connected to this output pin.

The update function of the input pin object sets its input pin value to the current state of the output pin to which it is connected, and calls the calcfunc function of the symbol object mother containing it.

The calcfunc function of the symbol object is a routine that describes the behavior of the device when the value of the input pin object changes. For all output pins whose value changes as the input pin value changes, the setstate2 function of the output pin object This will call the scheduler's add function.

As this process is repeated, the influence of the change of the output pin value of one device is transferred to other connected devices.

7 is a flowchart illustrating a process of storing a file created by a user in a client. First, when the system is running, the user must fill in the user profile in the ID field and the name field (S41). Next, when the file save button is pressed (S42), the new system generates a message (not shown in the drawing) to be entered if the user inputs an ID and name but no data is entered to check.

If the ID and name are entered, a file storage window is generated (S42_2). At this time, the user enters a directory and file name to be stored in the client and clicks the OK button. When the save button is pressed, the file is stored in the hard disk (S42_3), and the system prohibits writing of the ID and name to the file (S44).

In the process of loading a file from the client, when the load button is pressed, the system checks whether an ID and a name are written (S43_2), and creates a window (S43_3) for viewing files of the client if written. In the created window, the user selects a file (S43_3) and presses a confirmation button. According to the signal of the confirmation button, the ID and name in the selected file and the ID and name entered by the user are compared (S43_4), and the selected file is displayed on the screen of the client only when they match each other (S43_5). The ID and name writing is prohibited for the file (S44).

8 illustrates a process of storing and loading a file in the server. When the save button is pressed on the server in order to store the file in the server (S46), it is checked whether an ID and a name are input (S46_1). If the ID and name are entered, a window for inputting the password and name is opened (S46_2). Accordingly, when the user inputs a password and a name, the system checks whether the password, ID, and name are registered (S46_3). If a password, ID, and name are registered, the file is stored in the user's directory (S46_4). If the password, ID, or name is not registered, or if the registered password, ID, or name is different from each other, the corresponding message is displayed (not shown) on the client.

In the process of loading a file from the server, when the button to be loaded from the server is pressed (S47_1), the ID and name are checked (S47_2), and if so, a window for inputting the password and name is opened (S47_3). Accordingly, when the user enters a password and name, presses the OK button (not shown), the system checks whether a password, ID, and name are registered (S47_4), and if so, displays files from the user directory to the client ( S47_5). When the user selects a file to be loaded and the button for loading the file is pressed, the user transmits the file from the server to the client (S47_6), and the client displays the loaded file on the screen (S47_7). Writing of the ID and name is prohibited for the displayed file (S48).

In the above, the message for inputting ID and name and the process of selecting a file and pressing the OK button, and the part for not displaying the message generated when ID and name are different from each other are already known techniques, which can be easily implemented by those skilled in the art. It is considered to be omitted because it can be omitted.

The ID and name writing is prohibited for files stored or loaded on the client or server. Therefore, even if the loaded file is modified, writing of ID and name is prohibited, thereby fundamentally preventing the copy of the file, thereby improving the learning by preventing other users from modifying and submitting the same file.

FIG. 9 is a view showing an embodiment of the system of the present invention, and has an interface almost similar to the shape of a breadboard made offline. The buttons described in the embodiment of FIG. 9 are described from the user's point of view, and in the present invention, it is natural that the user cannot be the subject of the present invention, but it is judged that it is easy to understand the present invention from the user's point of view. In addition, it is determined that those skilled in the art can understand the description from the user's point of view.

ID, NAME (91): This is a field where you enter the circuit designer ID and NAME. The ID and NAME entered in this column for the circuit copy protection function cannot be changed once the file is saved or printed. To load a saved circuit, the user ID and NAME of the file must be filled in before the circuit is loaded.

LibSave (92): Provides the ability to save the designed circuit in the server system. If you click the button, a new window pops up. Enter the password and file name here and click the "OK" button. This feature is only available if you are connected to the Internet.

LibLoad (93): Loads the circuit in the library of the server system. After entering ID and NAME, press the button. A new window appears. Enter the password here and press the OK button to display the file list window. Select the desired one from this list and the circuit will be loaded on the screen. If a student has access, they can only see the student's private folder. If a professor has access, they can see all student libraries. This feature is only available if you are connected to the Internet.

NewLoad, Append (94): This selection box designates one of the ways to delete and load a circuit on the current screen when loading a circuit, or to append to the current circuit.

Load (95): Loads a circuit saved in your local system. Pressing the button brings up a file selection window. In this case, select the file you want and press the Open button to load the circuit.

By copy protection, the ID and NAME must match the ID and NAME of the file to be loaded.

Save (96): This button saves the current design circuit to the local system. If the file name is already set when the button is pressed, it is saved as the file name. If the file name is not set, it operates as if the SaveAs button is pressed.

SaveAs (97): This button is to save the current design circuit to the local system by renaming the file. Press button to open the window where you can specify the folder to save. Write the file name of the circuit and press the Save button. Extensions are automatically appended with * .bbc. It is always a good idea to make sure you have entered the ID and NAME correctly before saving. The extension of bbc (* means all phrases) can be easily changed by those skilled in the art and the present invention is not limited or reduced by the extension.

Print (98): Prints a circuit designed on the current screen. This is a known technology and will not be described.

HELP (99): Help for the entire program can be viewed through a web browser.

? (100): It is a function to get help about each device. First press this button and click on the desired device to get help for that device. ? If you press button, LogicSim operation mode becomes help mode.

EXIT 101: Pressing the EXIT button ends the current program.

PIC16C84 (102): A device that implements the function of the PIC16C84 chip, a one-chip microcontroller, and has a sub-window for downloading and debugging an executable program.

TTL 103 is a button for generating 74 series elements of a semiconductor integrated circuit chip. This button creates 74 series devices. You can select the desired TTL number from the selection box to the right of the button (Chip numbers currently supported: 0, 2, 4, 8, 10, 11, 20, 21, 30, 32, 42, 47, 51, 74). , 75, 76, 80, 82, 83, 85, 86, 89, 90, 93, 138, 147, 148, 153, 157, 164, 181, 182, 194, 393, 518, 684, 686, 688) The TTL will always appear in the upper left corner of the screen. You can drag this device to the desired location by dragging it with your mouse. When moving the TTL, all the pins must match the pinholes on the breadboard, for an educational effect such as fitting the empty holes when inserting the chip on the breadboard.

7SEG 104: A button for generating a seven segment indicator element. You can choose the type (A = anode common type, K = cathode common type) from the selection box next to the button.

wire (105): A button for drawing a line. When this button is pressed, BreadBoard's operation mode becomes wire mode. After pressing this button, press the left button of the mouse at the place where you want to start the line (empty hole on the breadboard), the first point will be taken, and if you move the mouse, you will see the line move along the mouse. Clicking the left button again at any point draws a line up to the clicked point, and so on. To draw the last point of the line, right-click on the empty hole on the breadboard and finish drawing the current line. To continue drawing another line, left-click on the empty hole to start drawing a new line. To completely exit the line drawing mode, press the cancel button at the bottom left of the screen or double-click the right mouse button (BreadBoard operation mode becomes the default mode).

Note that when drawing a line, the first start point and the last end point must coincide with the empty hole of the substrate, and no two or more start or end points of the line can be connected to one substrate hole. This line drawing is exactly the same effect considering that only one line can be inserted into one hole of the breadboard when connecting the circuit using the actual wire, and the line can be arbitrarily bent in the middle.

To change the color of the line, click on the color button next to the wire button and specify the desired line color. To change the color of the line already drawn, specify the line color using the color button and double-click on the line in basic mode to change it to the specified color.

TEXT 106: A button for attaching comments or the like to the circuit. You can also specify the font size and color in the TEXT input window that appears when you press the button. Only one line is allowed in TEXT. You cannot use the `` 'character when writing Text. If you want to edit the text already inserted in the schematic, double click the text with the left mouse button in the basic mode.

TRACER (107): A kind of logic analyzer that shows the value change over time of a desired point in a circuit in the form of a graph in a separate window when simulating. Enter the number of tracer input channels in the field next to the button.

showOutput / hideOutput (108): When the showOutput button is clicked, the label of the button is changed to hideOutput, and the values of the wires used in the circuit configuration can be displayed by color. The line is gray when the value is 0, red when the value is 1, and yellow when the value is 2, and blue when the value cannot be determined. Clicking the hideOutput button changes the label back to showOutput, which shows the circuit in the line color you originally drew.

Grid 109: You can set the interval at which the mouse moves. The default value is 4 pixels.

clock [Hz] (110): A button to determine the frequency of the clock generator on the right side of the screen. The unit is Hz. If you want to change the frequency of the clock generator, write the frequency in the right column of this button and click this button.

copy (111) A button that copies a desired area of a device, line, or design drawing. When this button is pressed, the circuit portion of the currently selected state is copied.

There are two ways to copy a device.

First select the part you want to copy first with the mouse (if you want to copy only one element or line, click the element or line with the mouse. If you want to copy all elements and lines within a specific area, move the mouse to include that area. Dragging). Selected devices turn red. You can then press Ctrl on your keyboard and drag it with your mouse to copy it to the desired location.

If you select the second circuit to copy and click the copy button, the device and the line in the selected part are copied as it is and overlapped with the original device and the line, and the copied circuit part is displayed in red. Drag the red part to where you want with the mouse.

When moving the copied circuit to another place, the start and end points of the pins and lines of the device must coincide with the holes of the test board to move.

delete (112) Deletes the device or the lines in the selected area. You can also use the Delete key on your keyboard instead of this button.

deleteAll (113): Deletes everything on the current screen.

SimInit (114): This button initializes the circuit. If you press this button and the circuit does not operate normally, you can load a new circuit.

T (115): Click this button to change the breadboard's operation mode to toggle mode. In this mode, click the power switch or the on / off switch to change the state of the switch.

cancel (116): Change BreadBoard's operation mode to basic mode. In basic mode, the device or wires can be moved (but the power switch must be OFF).

Power supply terminal 117: As a power source, a terminal for supplying + 5V and 0V is provided (the -5V terminal does not operate in the current version). Devices such as TTL used on the breadboard operate only when + 5V (logical 1) and 0V (logical 0) are applied to the VCC and GND pins, so the circuit must be configured to be connected to this power supply terminal. This is to educate the beginners about the problem of skipping the power connection, which is most prone to mistakes when experimenting with real TTL chips.

on / off switch 118: When the on / off switch is clicked in the toggle mode with the mouse, the on and off states are repeated.When the on state is turned on, a logical value of 1 (+ 5V) is output. The value (0V) is output. A total of 11 on / off switches are provided.

Power switch 119: A switch for supplying power to operate the configured circuit, the ON and OFF state is repeated by clicking the switch in the toggle mode with the mouse. The circuit operates only in the ON state, and the circuit can be modified only in the OFF state (since the principle is to modify the circuit in the power OFF state during the actual hardware experiment). Devices and devices will only operate normally when the power switch is turned ON.

Clock generator 120: When the power switch is turned on automatically outputs the clock. The clock period can be changed using the clock [Hz] button in the center left of the screen. In other words, write the desired frequency in the box next to the clock [Hz] button and press the button.

LED and hexadecimal indicator 121: Lights up when 5V (logical value 1) is input. The relationship between the LED and the hexadecimal indicator is that four LEDs are paired and the value is displayed on the corresponding hexadecimal indicator as shown in the figure below.

Voltmeter 122: It is a voltmeter, and the voltage value between the red input terminal and the gray input terminal is displayed.

Speaker 123: Sound is heard when 5V (logical value 1) is input.

Design board 150: a board board the user configures the electronic circuit.

10 is an embodiment in which an electronic circuit is designed using a breadboard system shown as an embodiment of the present invention. In the embodiment of FIG. 10, a 2BIT ADDER is designed and may be designed differently according to a user's intention.

FIG. 11 is a window for inputting a password and a file name that appear when a user clicks on a file saver to save a circuit created by a user in a server as a file. And 1702, respectively, and when the OK button 1703 is pressed, the server searches for a name and password according to the above signal, and if it matches, displays the user's window (not shown). After the above process, the server displays the user's directory to the user and the user enters and saves the file name. The process of displaying the user's directory and entering the file name can be easily implemented by those skilled in the art. In addition, since it is a known technique, it is not described in detail.

FIG. 12 relates to a question mark button 100 (?, See FIG. 9). In the case where the button is clicked and an element on the circuit is clicked, the description of the element is displayed through the Internet. In the case where the user cannot know the circuit with respect to the displayed device, the input pin and the output pin of the device supported by the present invention will be described. The device shown in FIG. 12 shows an AND GATE having two inputs. Description of the 74LS08 chip as an assembly. Since the convenience for the user side as described above is also helpful for the user to understand the device.

According to the present invention, it is possible to design an electronic circuit easily without having to purchase a semiconductor chip and a breadboard device. It is possible to reduce the cost of repurchase resulting from the loss of the semiconductor chip and the damage of the breadboard device. In addition, due to the high cost of the conventional breadboard device, when experimenting with electronic circuits, it was normal for some students to make a group and conduct experiments for each group. There is an advantage to experiment.

In addition, when using the breadboard system of the present invention, when the electronic circuit is performed after the experiment or when the designed circuit is expanded, the electronic circuit may be stored in a file on a computer or stored in a server to modify or modify the electronic circuit. It can be extended easily, and at the same time, when the file is saved to the hard drive, the name and ID can be saved at the same time, and the name and ID of the file can not be modified when the file is loaded. This file can be prevented from being modified, and individuals can be encouraged to experiment with electronic circuits.

Claims (8)

A server computer that retrieves data from a user's input signal and displays a signal from a client and a client, receives a signal from the client, retrieves the corresponding data, and transmits the data to a local computer, and the local computer and the server computer are connected to the Internet. In the system, A user's client transmits a signal for executing an electronic circuit to a server computer via the Internet, and a server computer recognizing the transmitted execution signal retrieves data and transmits the data to a local computer. The local computer transmits the received data. It shows the window constituting the electronic circuit by storing in the memory, generates a semiconductor chip according to the user's input signal, pre-connects the generated chips according to the user's signal, and the server to the server according to the user's input A system for providing an electronic circuit based on the Internet for recognizing a signal transmitted from a server and storing data transmitted from the client in a database of the server. Provides a local computer of a user performing an electronic circuit experiment, a server computer providing an electronic circuit design to the user local computer, a storage device for storing data necessary for the electronic circuit experiment, and a design of the local computer and the electronic circuit of the user. In the method of designing an electronic circuit by connecting a server computer to the Internet, Your local computer Transmitting a system execution signal to a server; Receiving data transmitted from a server; Storing the received data in a memory; Displaying a window containing an electronic circuit design on a user's monitor; Consists of, Server computers that design electronic circuits Receiving an electronic circuit execution signal transmitted from a client; Retrieving data suitable for the execution signal and transmitting it to a local computer; Receiving an electronic circuit transmitted from a client; Storing the electronic circuit; Receiving an electronic circuit load signal transmitted from a client; Transmitting the electronic circuit to the client according to the electronic circuit load signal; Service provision system that consists of a network consisting of electronic circuits based on the Internet Provides a local computer of a user performing an electronic circuit experiment, a server computer providing an electronic circuit design to the user local computer, a storage device for storing data necessary for the electronic circuit experiment, and a design of the local computer and the electronic circuit of the user. In the method of designing an electronic circuit by connecting a server computer to the Internet, Your local computer Transmitting a system execution signal to a server; Receiving data transmitted from a server; Storing the received data in a memory; Displaying a window containing an electronic circuit design on a user's monitor; Retrieving the semiconductor chip from data of a local computer according to a semiconductor chip generation signal of a user and displaying the semiconductor chip on a user's monitor; Designing an electronic circuit by connecting the semiconductor chip according to a line connection signal of a user; Simulating the electronic circuit; Storing an electronic circuit designed by a user in a hard disk; Loading an electronic circuit stored by a user; Consists of, Server computers that design electronic circuits Receiving an electronic circuit execution signal transmitted from a client; Retrieving data suitable for the execution signal and transmitting it to a local computer; Receiving an electronic circuit transmitted from a client; Storing the electronic circuit; Receiving an electronic circuit load signal transmitted from a client; Transmitting the electronic circuit to the client according to the electronic circuit load signal; Service provision system that consists of a network consisting of electronic circuits based on the Internet The method of claim 3, The steps to show a window containing an electronic circuit design on your monitor A board board 150 constituting an electronic circuit by a user, a cell 91 for writing an ID and a name on the outer circumference of the board board, a button 103 for generating a semiconductor chip, a button 95 for loading an electronic circuit, and an electronic circuit A system for providing a service for configuring an electronic circuit based on the Internet having a button (96) for storing the, button 105 for connecting the line. The method of claim 3, In the step of searching for the semiconductor chip from the data of the local computer according to the signal generated by the semiconductor chip of the user and displaying on the user's monitor In the semiconductor chip, the input pin 41 observes the output pin of the pressing and transmits the logic value to the symbol 43, and the symbol 43 calculates the transfer pin logic value at the input pin to output the pin 42. A system for providing an electronic circuit based on the Internet, which compares a value of and a logic value of an output pin with a value of a calculated logic when the logic values are different from each other. The method of claim 3, The step of storing the electronic circuit designed by the user on the hard disk is If the save button is pressed, the server searches for whether an ID and a name are entered; Displaying a screen for inputting a password and a file name if ID and name are entered; Retrieving the entered name and password from a server; Storing the ID and name together in the electronic circuit file if the searched data and the input data are registered and the password for the ID is identical; Displaying a corresponding message when the name, ID, and password are different from each other; A system that provides a service for configuring electronic circuits based on the Internet. The method of claim 3, Loading the user designed electronic circuit from the hard disk Searching if an ID and a name are input when a button to be loaded is pressed; Displaying a window for inputting a password when ID and name are input; A user inputs a password and searches for whether a name and ID are registered in the server, and a password for the ID matches; If the ID and name password match, storing the electronic circuit file in a directory of the user; Displaying a corresponding message if the ID, name, and password do not match; A system that provides a service for configuring electronic circuits based on the Internet. Provides a local computer of a user performing an electronic circuit experiment, a server computer providing an electronic circuit design to the user local computer, a storage device for storing data necessary for the electronic circuit experiment, and a design of the local computer and the electronic circuit of the user. In the method of designing an electronic circuit by connecting a server computer to the Internet, The semiconductor chip to be displayed is composed of a combination of devices. The device is composed of an input pin, an output pin, and a symbol. When the value of the input pin is changed in an input signal, the input pin converts the changed value to a symbol. In the symbol, a logical calculation is performed based on the input value, and the value calculated in the symbol and the value of the output pin are compared with each other. And a semiconductor chip holding the logic value of the output pin if the value calculated from the symbol is the same as the logic value of the output pin.