JPS59121462A - Drawing checking device - Google Patents

Abstract

PURPOSE:To recheck easily an operating pattern, and to raise the efficiency of drawing check by executing image pickup of a circuit diagram by a TV camera, and confirming automatically basing on its image whether a truth table value coincides with the truth of the object operation or not. CONSTITUTION:A circuit diagram 1 is subjected to image pickup by a TV camera 2, and supplied to a monitor device 5 through a mixing circuit 4. Also, data of a truth table value which is matched to requested specifications inputted by operating a keyboard 6 is stored in a memory 11. Subsequently, a state input mode is set by operating the keyboard 6, a cursor position is shifted to a position of a step display column by an operating device 12, and its cursor position is registered in a memory 7 and a character storage device 9 by inputting a step number. In this state, when an operator inputs a signal line name, a signal line - display address converting memory 8 is controlled by the device 12, an address of the registered signal line name is provided to the circuit 4 through a raster signal converting circuit 10, and coincidence of the truth table value and the truth table value of the object operation is checked automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a diagram inspection device for inspecting a circuit diagram to determine whether a circuit is designed according to required specifications.

[Technical background of the invention]

Conventionally, logic circuit diagram inspection has been carried out using logical sindels on the circuit diagram, such as AND darts indicating logical product or O indicating logical sum.
After the R gate, H'' indicating a high potential state according to the logic
Alternatively, mark L''', which indicates a low potential state, according to the state caused by the signal or change in the input signal, write it down with a pencil, or visualize it in your mind to create a truth table (indicating the combination of output states for input states). Table) The circuit diagram has been inspected to see if it matches the time chart (a diagram showing a defined temporal state).With this method, when the logic becomes complicated, the circuit diagram is checked each time. It was necessary to erase or rewrite the @LII or wH' symbol above, and when I went back and reconsidered some of the steps and zos, I had to go back to the initial state and redo it. Also, if you forget to change one place, all the logic will go awry after that, and the inspection work will not go smoothly, and in the end, you will often have to check it by making a prototype.Therefore, it takes a lot of effort to confirm it. Since it was time consuming, if the blueprints were incorrect, the work was completely wasted, often resulting in huge losses.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and uses a television camera to photograph a circuit diagram, and based on the image, automatically determines whether or not the truth value matches the truth value of the desired operation. You can check
Moreover, it is an object of the present invention to provide a drawing inspection device that allows the operation pattern to be easily rechecked and the operation to be confirmed without overlooking anything.

[Summary of the invention]

That is, in order to achieve the above object, the present invention provides a means for outputting a video signal of a circuit diagram of a digital circuit, a means for receiving the video signal and displaying it as an image, and a desired position on the screen of the display means. means for specifying the signal line salt and logic signal contents in the circuit diagram and the position to be displayed; means for storing the input signal line salt and logic signal contents when they are input; means for displaying the input logic signal content at the registered logic signal content display position corresponding to the salt, and means for registering a truth table of a preset target digital circuit;
This registered truth table is compared with the storage contents of the signal line salt and logic signal contents storage means to check whether the operation corresponds to the truth table, and if there is a discrepancy, it is and means for outputting the circuit diagram to the display means, and registers the circuit diagram so that the signal line salt and logic signal content can be displayed by setting the position on the displayed circuit diagram and displaying the signal Line salt and logic 1 By inputting the signal content, display the logic signal content on the signal line of the circuit diagram, and by registering this, register the operation of the circuit diagram according to the circuit diagram, and register it in advance with this. Check if there are any errors by comparing the desired operation with the truth table, and if there are any errors, output them, and if it is due to an input error, correct it again and compare again. A cross-check is performed to determine whether the circuit is designed to perform the intended operation.

Specifically, a circuit diagram is photographed with a television camera, the image is superimposed on a character display image controlled by a microconbeater, and character display positions are determined and checked on logical symbols on the television image. When a series of changes in the clock signal or input signal is completed by sequentially inputting and displaying characters H or L indicating the contents of the logic signal, or when it is determined that a cycle has occurred, the input is terminated and each character is input and displayed. A feature of this system is that it can be easily inspected by displaying a truth table or time chart of checkpoints.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a circuit to be inspected, and FIG. 2 shows truth values based on required specifications. Further, FIG. 3 shows a block diagram of an embodiment of the chart inspection apparatus according to the present invention.

In FIG. 3, reference numeral 1 indicates a circuit diagram to be inspected, such as the one shown in FIG. 1, for example.

Further, 2 indicates a television camera, which photographs the circuit diagram 1, converts it into an electric signal, and displays it on the monitor device 5. 6-1
0 is the character generation processing system part that generates the characters to be superimposed on the TV image, 3 is the synchronization signal generation circuit, and 4 is the mixing circuit that mixes the circuit diagram signal and character signal and creates the sum of the analog signals. There is one route.

The synchronization signal generation circuit 3 generates a horizontal synchronization signal and a vertical synchronization signal 9 for the monitor device 5, controls the scanning operation of the television camera 2, and controls character display timing.

The 6Vi key in the character generation processing system indicates the - code, and is used to input characters to be displayed on the monitor device 5, input various commands, and output signals for switching operation modes by key operation.

The above operation modes are divided into checkpoint assignment mode, status input mode, status display mode, check mode, and reproduction mode.

In the above mode, it is possible to check whether the circuit diagram is designed according to the truth table.

Blocks 6 to 12 embody the above mode. Of these, 7 is a memory for storing the state value inputted in the state input mode according to the s'rgp for each signal line, and 8 is a memory for storing the state value of each signal line in the monitor device 5.
This is a signal line-display address conversion memory for storing which address of the display should be displayed. Reference numeral 9 denotes a character storage circuit for storing characters in a matrix or box shape, such as 8 rows and 15 characters, for example. 1oVi A raster signal conversion circuit that reads out the character code stored in the character storage circuit 9 according to the synchronization signal from the synchronization signal generation circuit 3 and converts it into a rasque signal for display on the monitor device 5 according to the bit pattern of the character. It is. 11 is a memory that stores truth values according to design specifications. 12 these memories 7.8
．． 11, keyboard 6, character storage device 9, and raster signal conversion circuit 10. A series of controls including storing the inputted contents in each memory, writing the state of the memory 7 to the character storage device 9 according to the address of the signal line-display address conversion memory 8, and displaying it on the monitor device 5. govern

The mode with checkpoint allocation is a mode in which an entry area marked with K"()" is set near the signal line of the logic symbol on the display as shown in Fig. 4, and a truth table is input. This corresponds to creating a conversion table in memory that associates signal line salts with display addresses.

In addition, in the status input mode, the logic input, that is, the input line health l'H of the signal line A as shown in the example of the work result shown in FIG.
This is an operation mode in which inputs are ``L'', ``L'' of ``, B'', and ``L'' of CO, and the states to be taken by the output signal lines D and E are input accordingly. Specifically, this is displayed by keying in the signal line salt "A" and then keying in H#.Also, the operator judges and inputs the state of the signal 2-in DSE, but in this case, the signal Both lines D and E are II
Enter HIt. This state is determined by distinguishing the combinations of input states by STEPs in a truth table as shown in FIG. 2, and inputting them in correspondence to each 5TEP. In the case of FIG. 4, according to the truth table of FIG. 2, the state is 5TEP 5.

The status display mode is a mode in which the input truth table is displayed when all 5 TEPs have been input.

The check mode is a mode in which it is checked whether the above inputs match the truth table required from the design specifications. And the reproduction mode is 5TE of the truth table above.
By inputting P, the circuit diagram and status symbol aHn
, llL# is displayed. It is also possible to sequentially change the initial state by a single step.

Next, the operation of this device having the above configuration will be explained. Assume that based on the required specifications, the truth table is as shown in FIG. 2, and a logic circuit as shown in FIG. 1 is created as a designed circuit diagram in accordance with the truth table. This circuit diagram 1 is imaged by a television camera 2, and its video signal is given to a monitor device 5 via a mixing circuit 4. As a result, the image of the circuit diagram 1 is displayed on the monitor device 5.

Next, the operator operates the keyboard 6 to set the checkpoint allocation mode. When this setting is made, the arithmetic unit 12 controls the two-star signal conversion circuit 10 in response to the cursor operation input from the keyboard 6, so that the raster scan position on the monitor device 5 moves to the position specified by the cursor operation input. Output the Kanle raster signal at a timing that matches. This output is superimposed on the video signal from the television camera 2 by the mixing circuit 4, and sent to the monitor device 5 to be displayed as a video. As a result, a cursor is displayed on the monitor device 5 so as to be superimposed on the image of the circuit diagram 1. Therefore, while looking at the monitor device 5, the circuit diagram 1
Move the cursor to an appropriate position near the signal line of the image,
Once the position is determined, perform a p registration operation using the keyboard 6. As a result, the arithmetic unit 12 registers the display address of the position corresponding to this cursor position in the signal line-display address conversion memory 8.

As a result, the character code "()" is registered at the address corresponding to the registered display address in the character storage device 9. Then, in synchronization with the synchronization signal of the synchronization signal generation circuit 3, the Lascoux signal conversion circuit 10 reads out the character codes registered sequentially from this character storage device 9, and the character 7 ont corresponding to this character code is converted into a 2 star 1 signal. and sent to the mixing circuit 4. Since this two-star signal is synchronized with the video signal of the television camera 22, it is mixed with the video signal at the timing specified by the cursor, and the monitor device 5
Therefore, on the monitor device 5, a character '()# will be displayed at the cursor designated position on the displayed circuit diagram.

In the same way, move the cursor near each signal line of the circuit diagram that is the display image and add the signal line salt (A, B in the figure).
5C5D) and register it. This registration is made in the signal line-display address conversion memory 8, but this registration may be done simultaneously by keying in the signal line salt when registering "()".

By repeating such operations, the display positions of each signal line salt and signal content on the circuit diagram are registered.

In addition, by operating the keyboard 6, the second
Input the truth table data as shown in the figure, and
to be memorized.

Next, operate the key stroke to set the status input mode. As a result, the arithmetic unit 12 moves the cursor to the position of the 5TEP display column in FIG. 4, which has been set in advance by a program etc., in order to follow the input step of which step in the truth table, and the step number. When keyed in, this is stored in 5T of the character storage device 9.
This is registered in the corresponding position of the EP display field and in the memory 2, respectively. Then, the operator key-in the signal line salt. The arithmetic unit 12 finds the corresponding signal line salt from among the signal line salts registered in the signal line-display address conversion memory 8, and the signal content of the signal line salt. The address of the display position is output, a cursor is displayed on the screen position of the monitor device 5 corresponding to the address, and the input of the contents after the signal is translated. Therefore, the contents of the signal can be changed by key operation.''
When either 'H'' or L'' is input, its contents are registered in the memory 7 in correspondence with the signal name, and the character code of the input contents is registered in the position corresponding to the address in the character storage device. Ru. Therefore, the character font corresponding to this character code is the raster signal conversion circuit 10.
The data is then output and displayed on the monitor device 5 at a position corresponding to the address.

Similarly, signal line salts are designated one after another and the signal contents of the signal lines are registered. Regarding the output signal line, the operator judges the output content in his head by taking into consideration the signal state and logic content of the input signal line, and inputs the content of the judgment.

After inputting all the steps of the truth table, that is, all the states, in this way, the check mode or the state display mode is selected.

If the state display mode is selected, the arithmetic unit 12 reads the result input in the state input mode from the memory 7, edits it, and inputs it to the character storage device 9 for display on the monitor device 5 as a truth table. . This is converted into a raster signal by the Lascue signal conversion circuit 10, and the monitor device 5
and is displayed here as a truth table. If an error occurs in the truth table, specify the reproduction mode and call the state input mode of the stage where the error occurred. Since the previous registered contents in the step and step are left in the memory 7,
This is read out and displayed on the monitor device 5, the signal line salt containing the error is keyed in, the cursor is moved to the signal content display position of that signal line, and the correct content is keyed in. As a result, any errors in that line are corrected and the correct content is registered.

Next, when the check mode is designated, the arithmetic unit 12 compares the input contents in the state input mode registered in the memory 7 with the truth table of required specifications registered in the memory 11 at each step.

And if there are any discrepancies, they will be displayed.

Therefore, when an error is displayed, the operator logically checks whether the error 9 can be corrected in the status input mode, and if it is correctable, corrects it correctly.

If you find something is correct in check mode, you can use replay mode to see how the circuit's signal states change in a single step to verify its operation.

In this way, while displaying the circuit diagram image, register the signal line salt and signal content display position near the signal line on the circuit diagram by key operation, and enter the signal line salt and signal content by key operation. The signal content is displayed at the signal content display position of the corresponding signal line, and the signal content is registered in correspondence with the signal line salt, and after registration is completed, the content of the truth table based on the preset required specifications is displayed. Check for errors by comparing and checking the registered content, and if an error is found, display the location of the error, and if the error is due to an input error, correct the registered content and check again. In addition to being able to easily check the operating status of digital circuits and reproducing them at any time, it is also possible to simulate whether or not the designed logic circuit performs the intended operation. You can check the operation without building an actual circuit, and the registered contents under various input conditions can be reproduced at any time. The efficiency of drawing inspection will be dramatically improved by freeing you from the burden of time-consuming work. Further, it is possible to easily check whether the circuit diagram is designed according to the design specifications without overlooking it.

Furthermore, by inputting the output of this device to a logic tester or logic gate raster, it is also possible to check the functionality of the device being adjusted.

Although examples of truth tables and circuit diagrams have been described above, time charts are used when the input state changes from moment to moment. In that case, the time chart can be checked by replacing 5TEP with time or clock cycle. Further, in the above embodiment, the states of the input/output lines are indicated by H'' and ''Ln, but otherwise, @Ill.

Other symbols may be used when the status is not determined, when the value is 3 values, etc.

In addition, although a television camera is used as the circuit diagram input device, other input devices such as a facsimile reading device may also be used, or a converter can be used.If the circuit diagram is being created, the input paper It may also be read from an MT (magnetic tape device) or a disk.

Also, if the display method is a color display, etc., it may become easier to read. Moreover, the input state from the outside may be automatically generated by a combination.

In addition, the display position of the signal line that has not yet been input at each 5 TEP in the truth table may be plinked (flashing), blanked out, underlined, the display color changed, or any other mark made. It is also effective to prevent oversight. Further, in the above embodiment, the Hm and IIL11 symbols for indicating the logic level of the signal line are keyed in, but they may be input in reverse using a light ben or the like.

〔Effect of the invention〕

As detailed above, the present invention includes a means for outputting a video signal of a circuit diagram of a digital circuit, a means for receiving the video signal and displaying it as an image, and a means for specifying a desired position of the display means on the screen. means for registering positions in the circuit diagram at which signal line salts and logic signal contents are displayed; means for storing signal line salts and logic signal contents when they are input; means for displaying the input logic signal content at the registered logic signal content display position; means for registering a truth table of a preset target digital circuit; means for comparing the signal line salt and the contents stored in the storage means of the logic signal contents to check whether the operation corresponds to the truth table, and if there is a discrepancy, outputting it to the display means; The circuit diagram is displayed on the display means, and the position on the displayed circuit diagram is set so that the signal line salt and logic signal contents can be displayed. By displaying d in the logic signal on the signal line of the circuit diagram, and registering this, the operation of the circuit diagram is registered according to the circuit diagram, and this and the truth that will result in the desired operation registered in advance. Compare and check with the value table to check if there are any errors, and if there is a deviation, output it, and if it is due to an input error, correct it again and compare and check again. Since you can easily check the operation of the digital circuit that has been created as a circuit diagram, you can check the information by reproducing it at any time, making it easier to assemble the actual circuit. You can check the operation first, and the registered contents under various input conditions can be reproduced at any time, so once registered, you can know the details of each operation at any time. A diagram inspection device that has features such as being able to dramatically improve the efficiency of diagram inspection by being freed up, and also being able to easily and without overlooking whether the circuit diagram is designed according to the design specifications. can be provided.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a circuit diagram to be inspected, Fig. 2 is a diagram showing its truth table, Fig. 3 is a block diagram showing an embodiment of the present invention, and Fig. 4 is a monitor device. FIG. 3 is a diagram showing an example of a display image. 2...TV camera, 4...Mixing circuit, 5...Monitor embedded, 6...Keyboard, 7.11...Memory, 8...Signal line-display address conversion memory, 9...・
Character storage device, 1o... Raster conversion circuit, 1
2... Arithmetic circuit.

Claims (1)

[Claims] means for outputting a video signal of a circuit diagram of a digital circuit;
means for receiving a video signal and displaying it as an image; means for specifying a desired position on the screen of the display means to register a position for indicating the signal line salt and logical signal content in the circuit diagram; means for storing input line salt and logic signal content; means for displaying the input logic signal content at the registered logic signal content display position corresponding to the input signal line salt; A means for registering a truth table of a preset target digital circuit, and comparing the registered truth table with the stored contents of the signal line cannon and the storage means for logical signal contents to determine the target value. Check whether the action corresponds to the truth table,
The drawing inspection apparatus further comprises means for outputting a discrepancy to the display means if there is a discrepancy.