JPH08106480A - Cell correspondence table generation device and drawing converting device using same - Google Patents

Abstract

PURPOSE: To generate an accurate circuit diagram in a short time by automatic cell replacing operation. CONSTITUTION: A library read part 42 reads function information on respective cells and the shapes of symbols out of cell library which are different in functionally corresponding cell name, pin name, and symbol shape. The function information on the respective cells is extracted by a function extraction part 44. A function comparison part 45 checks whether or not the extracted cells can be replaced, and a correspondence table generation part 46 makes the replaceable cells correspond one to one to generate a cell correspondence table, which is stored in a file. This cell correspondence table is utilized to convert a circuit diagram using the cells in one cell library into a circuit diagram using the cells in the other cell library.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cell correspondence table creating apparatus for creating a cell correspondence table for automatically converting cells functionally corresponding to each other between CAD systems using a heterogeneous cell library, and a drawing using the same. The present invention relates to a conversion device.

[0002]

2. Description of the Related Art When a circuit of an LSI, for example, is designed by a CAD system, a pattern which is considered to be a basic circuit of LSI design, such as a logic element, for example, an AND gate or a circuit combining them, is registered as a cell. I'll do it. The symbol shape of this cell differs depending on the manufacturer of the CAD system, and the circuit diagram created by a certain CAD system may be used by another CAD system that adopts a different symbol shape of the cell (including the lead line). In such a case, it is necessary to replace the symbol shape and pin name of the cell of the circuit diagram created by a certain CAD system with the symbol shape and pin name of the cell adopted in another CAD system. Conventionally, the symbol shape or pin name of this cell is manually replaced, or a symbol terminal definition layer is provided in advance in the receiving CAD system for each cell corresponding to the cell of the sending CAD system. The cells were replaced using the hierarchy.

Further, as disclosed in, for example, Japanese Patent Laid-Open No. 4-236667, a conversion destination symbol graphic in which a cell name, a symbol shape, and a pin name of a sending side CAD system are copied and stored in a receiving side CAD system. A circuit diagram conversion device provided with a library is adopted. When the circuit diagram information is sent from the CAD system on the sending side, this circuit diagram conversion device extracts the cell name included in the circuit diagram information and searches the conversion destination symbol graphic library to find the searched symbol graphic and pin name. Take out and make a circuit diagram. Further, when the extracted cell name is not stored in the conversion destination symbol graphic library, the receiving CAD system sends the sending CAD.
The system is requested to send out the symbol graphic, etc., the symbol graphic etc. sent from the CAD system on the sending side is stored (copied) in the conversion destination symbol graphic library, and a circuit diagram is created using the copied symbol graphic etc. ing.

[0004]

If the symbol shape of the cell or the pin name is manually replaced as described above, a lot of time is required for the replacement work and a circuit diagram of an LSI having a high degree of integration is displayed. There was a high probability that you would accidentally replace it when you created it.

When a symbol terminal definition hierarchy is provided in the CAD system on the receiving side, there is no mistake in replacing the circuit diagram, but since the symbol terminal definition hierarchy is created manually, The work was not easy and took a lot of time. When a cell that is not defined in the symbol terminal definition hierarchy is used, the CA on the receiving side
I couldn't reproduce the exact circuit diagram with D system.

Further, the sending side C is connected to the receiving side CAD system.
In order to replace the symbol figure, etc. when a circuit diagram is created using the symbol shape etc. copied to the conversion destination symbol figure library by providing a conversion destination symbol figure library for copying the cell name, symbol shape etc. of the AD system. Although the manual work of is not required, it is necessary to frequently repeat the copying of the symbol graphic of the sending side to the conversion destination symbol graphic library of the receiving side at the initial stage of starting to read the schematic, and actually create the schematic. It took a lot of time. Further, in the receiving CAD system, when the circuit diagram sent from another CAD system is reproduced, the circuit diagram is created using the copied symbol graphic of the sending side.
Since the circuit diagram created from another CAD system and the circuit diagram created by the receiving CAD system itself have different symbolic figures and pin names, subsequent layout design and the like were not easy.

The present invention has been made in order to solve the above disadvantages, and a cell correspondence table preparation device capable of automatically performing cell replacement work to prepare an accurate circuit diagram and drawing conversion using the same. The purpose is to obtain a device.

[0008]

A cell correspondence table creating apparatus according to the present invention creates a cell correspondence table of a heterogeneous cell library in which functionally corresponding cell names, pin names, and symbol shapes are different. A device having a library reading means, a function extracting means, a function comparing means, a correspondence table creating means, and a correspondence table file, and the library reading means reads out the function information of each cell and the shape of a symbol from a heterogeneous cell library. The function extracting means extracts the function information of each cell of each heterogeneous cell library, and the function comparing means compares the extracted function information of each cell of each heterogeneous cell library,
It is checked whether the cells of one cell library can be replaced with the cells of the other cell library, and the correspondence table creating means creates a cell correspondence table in which the replaceable cells of different cell libraries are associated one-to-one The table file is characterized by storing the created cell correspondence table.

Further, the drawing conversion apparatus according to the present invention has a cell correspondence table preparation device and a logic circuit diagram conversion device, and the cell correspondence table preparation device is a library reading means, a function extraction means, a function comparison means, and a correspondence table preparation. And a correspondence table file, the library reading means reads the functional information of each cell and the shape of the symbol from the heterogeneous cell library, and the function extracting means extracts the functional information of each cell of each heterogeneous cell library, The comparing means compares the functional information of the extracted cells of different heterogeneous cell libraries to see if the cells of one cell library can be replaced with the cells of the other cell library. Create a cell correspondence table in which each cell is made to correspond one-to-one, and the correspondence table file stores the created cell correspondence table,
The logic circuit diagram conversion device has a circuit diagram reading means, a cell correspondence table reading means, a circuit diagram copying means, and a cell converting means, and the circuit diagram reading means uses a cell of one cell library to make a circuit diagram of a logic circuit diagram. The information is read, the circuit diagram copying means copies the circuit diagram from the read circuit diagram information, and the cell correspondence table reading means reads the cell of the other cell library corresponding to the cell used in the copied circuit diagram in the cell correspondence table. The cell conversion table is read from the cell correspondence table of the preparation device, and the cell conversion means replaces each cell of the copied circuit diagram with the cell of the other cell library that has been read to rewrite the circuit diagram.

[0010]

In the cell correspondence table creating apparatus of the present invention, the functional information and the symbol shape of each cell are read out from the cell libraries having different cell names, pin names, and symbol shapes that are functionally corresponding to each other and different cell libraries are read. The function information of each cell is extracted. Check whether this extracted cell can be replaced. A cell correspondence table in which replaceable cells are made to correspond one-to-one is created and stored in a file.

Further, the drawing conversion device of the present invention utilizes the cell correspondence table created and stored by the cell correspondence table creating device to make a circuit diagram using the cells of one cell library of the other cell library. Convert to a circuit diagram using cells.

[0012]

1 is a block diagram showing an embodiment of the present invention. CAD system 1 and CAD system 2 shown in the figure
Are connected by a network or the like, and a drawing such as a circuit diagram created by the CAD system 1 can be used by the CAD system 2. The CAD system 1 on the sending side has a cell library 11 that stores cell names, pin names, and symbol shapes, and a circuit diagram creation device 12 that creates a logic circuit diagram or the like using the cells stored in the cell library 11. The CAD system 2 on the receiving side has a cell library 21 and a circuit conversion device 3. The cell library 21 has cell names different in cells functionally corresponding to the cell library 11,
It is stored in the form of pin name and symbol. The circuit conversion device 3 has a cell correspondence table creation device 4 and a logic circuit diagram conversion device 5.

As shown in the block diagram of FIG. 2, the cell correspondence table creating device 4 has a CPU 41 for managing the entire device, a library reading part 42, a function information / symbol storage part 43, a function extracting part 44, a function comparing part 45, Correspondence table creation unit 46, correspondence table file 47, non-correspondence cell file 48 and output unit 4
9 and. The library reading unit 42 reads the function information of each cell and the shape of the symbol from the cell library 11 on the sending side and the cell library 21 on the receiving side, respectively. The function information / symbol storage unit 43 temporarily stores the function information and the symbol shape of each cell of the cell library 11 and the cell library 21 read by the library reading unit 42. The function extraction unit 44 extracts the function information of each cell stored in the function information / symbol storage unit 43. Function comparison unit 45
Are the cell libraries 11 and 21 extracted by the function extraction unit 44.
The function information of each cell is compared with each other, and it is checked whether or not the cell of the cell library 11 can be replaced with the cell of the cell library 21. The correspondence table creation unit 46 creates a cell correspondence table in which the cells of the cell library 11 and the cells of the cell library 21 that are determined to be replaceable by the function comparison unit 45 are made to correspond one-to-one, and store them in the correspondence table file 47. In addition, the unsupported cell file 48 stores a list of cells of the cell library 11 that the function comparison unit 45 has determined cannot replace. The output unit 49 outputs the cell correspondence table and the like stored in the correspondence table file 47 to the logic circuit diagram conversion device 5.

As shown in the block diagram of FIG. 3, the logic circuit diagram conversion device 5 includes a CPU 51 for managing the entire device, a circuit diagram reading part 52, a circuit diagram copying part 53, and a cell correspondence table reading part 5.
4, a cell conversion unit 55, a display unit 56, a read circuit information storage unit 57, and a circuit diagram output unit 58. Circuit diagram reading section 5
Reference numeral 2 reads the circuit diagram information of the logic circuit diagram created by using the cells stored in the cell library 11 by the circuit diagram creation device 12 of the CAD system 1 on the sending side. Circuit diagram copying unit 53
Copies the circuit diagram from the circuit diagram information read by the circuit diagram reading section 52. The cell correspondence table reading unit 54 reads the cell correspondence table from the cell correspondence table creation device 4. The cell conversion unit 55 replaces each cell of the circuit diagram copied by the circuit diagram copying unit 54 with the cell of the cell library 21 according to the cell correspondence table and rewrites the circuit diagram. The display unit 56 displays the circuit diagram copied by the circuit diagram copying unit 54 or the rewritten circuit diagram. The read circuit information storage unit 57 temporarily stores the circuit diagram information read by the circuit diagram reading unit 52 and the circuit diagram information of the circuit diagram rewritten by the cell conversion unit 55. The circuit diagram output unit 58 outputs the circuit diagram information of the circuit diagram rewritten by the cell conversion unit 55.

When the cell correspondence table creating apparatus 4 configured as described above creates a cell correspondence table of cells stored in the cell library 11 of the CAD system 1 on the sending side and the cell library 21 of the CAD system 2 on the receiving side. The operation will be described.

At the time of initial processing when the CAD system 1 and the CAD system 2 are connected by a network, the library reading unit 41 selects the function information and cell name of each cell from the cell library 11 on the sending side and the cell library 21 on the receiving side, respectively. The pin name and the symbol shape are read out and temporarily stored in the function information / symbol storage unit 43. Cell library 11 on the sending side
After reading each cell of the cell library 21 on the receiving side and temporarily storing it in the function information / symbol storage unit 43, the function extraction unit 44 designs an LSI such as a logic element, for example, an AND gate or a circuit combining them. The function information of each cell stored in the function information / symbol storage unit 43 is extracted for each basic circuit of and is sent to the function comparison unit 45. The function comparison unit 45 compares the transmitted function information of each cell of the cell libraries 11 and 21 and determines that the cell of the cell library 11 is the cell library 2
Check whether it can be replaced with the cell of 1. When checking whether this replacement is possible, the logic function of the cell, the number of pins, and the input / output attributes of the pins are also checked. For example, as shown in FIG. 4, when the number of pins of the cell 13 indicating the AND gate of the cell library 11 and the number of pins of the cell 23 indicating the AND gate of the cell library 21 are the same, it is judged that the replacement is possible. ,
The correspondence table creation unit 46 is notified of the replaceable cell library 11 cells and the cell library 21 cells. Upon receiving this notification, the correspondence table creating unit 46 creates the cell correspondence table 6 in which the cells of the replaceable cell library 11 and the cells of the cell library 21 are in a one-to-one correspondence as shown in FIG. For example, when the cell 13 indicating the AND gate of the cell library 11 and the cell 23 indicating the AND gate of the cell library 21 shown in FIG. 4 are sent as replaceable cells, the symbol AND of the cell 13 and the pin names A and B are sent. , Z
And symbol 23 of cell 23 and pin names I1, I2, O
A cell correspondence table 6 corresponding to 1 is created. All the cells registered in the cell library 11 on the sending side for determining whether or not this cell can be replaced and for creating the cell correspondence table 6,
That is, the process is performed for all cells used when creating a circuit diagram by the circuit diagram creation device 12. After this process is completed, the correspondence table creating unit 46 stores the created cell correspondence table 6 in the correspondence table file 47. Further, the correspondence table creation unit 46 creates a list of cells of the cell library 11 that the function comparison unit 45 has determined to be unreplaceable, and stores the list in the unsupported cell file 48. After performing all of these processes, the cell correspondence table creating device 4 enters a standby state.

Next, the operation of converting the circuit diagram created by the circuit diagram creation device 12 using the cell correspondence table 6 stored in the cell correspondence table creation device 4 by the logic circuit diagram conversion device 5 will be described.

When the circuit diagram information of the logic circuit diagram created by the circuit diagram creating device 12 of the CAD system 1 is sent to the CAD system 2, the circuit diagram reading section 52 of the logic circuit diagram converting device 5 is sent.
Sequentially reads the sent circuit diagram information and stores it in the read circuit information storage unit 57. When the reading of the sent circuit diagram information is completed, the logic circuit diagram conversion device 5 starts circuit diagram conversion processing. Upon entering the circuit diagram conversion processing, the circuit diagram copying unit 53 copies the circuit diagram from the circuit diagram information read by the circuit diagram reading unit 52 and displays it on the display unit 56. For example, when the circuit diagram information of the logic circuit diagram 14 shown in FIG. 6 is sent from the circuit diagram creating device 12, the logic circuit diagram 24 shown in FIG. 7 is created based on the circuit diagram information and the logic circuit diagram 14 is created. Make a copy. After that, the cell correspondence table reading unit 54 copies the copied logic circuit diagram 24.
Cell library 21 corresponding to each cell used in
Cell is read from the cell correspondence table 6 of the cell correspondence table creation device 4. The cell conversion unit 55 reads the read cell library 21.
A diagram of the lower hierarchy, which is a definition hierarchy in which the cells used in the logic circuit diagram 24 copied for each cell of FIG. For example, when the cells of the cell library 11 used in the logic circuit diagram 24 copied as shown in FIG. 7 have the symbol AND and the pin names A, B and Z, the symbol AN of the cell of the cell library 21 is used.
Lower layer 2 in which D2 is associated with pin names I1, I2, O1
Create 5. Then, the circuit diagram is rewritten by replacing the symbol AND of the logic circuit diagram 24 and the cells of the pin names A, B, and Z with the created lower hierarchy 25. This process is repeated for each cell of the logic circuit diagram 24, the logic circuit diagram 24 is converted into a logic circuit diagram using the cells of the cell library 21 and displayed on the display unit 56, and the circuit diagram information is read. The information is stored in the information storage unit 57. When an output request is made to another external device, the circuit diagram output unit 58 outputs the rewritten circuit diagram information of the logic circuit diagram. If the cell of the corresponding cell library 21 among the cells used in the copied logic circuit diagram 24 is not registered in the cell correspondence table 6, the cell correspondence table reading unit 54 reads the unsupported cell file 4
Check 8 and display that fact to make it clear that it is a special cell.

In the above embodiment, the cells in the cell library 21 corresponding to the cells used in the copied logic circuit diagram 24 are sequentially read from the cell correspondence table 6 of the cell correspondence table preparation device 4. However, when entering the circuit diagram conversion processing, the cell correspondence table reading unit 54 may collectively read the cell correspondence table 6 of the cell correspondence table creating device 4 and temporarily store it in the logic circuit diagram conversion device 5.

[0020]

As described above, according to the present invention, the functional information and the symbol shape of each cell are read out from the cell libraries having different cell names, pin names, and symbol shapes that functionally correspond to each other, and each different cell library is read. The function information of each cell is extracted, it is checked whether the extracted cell can be replaced, and the replaceable cells are automatically created in a one-to-one correspondence table. The time required to create a table can be significantly reduced.

When the circuit diagram using the cells of one cell library is rewritten into the circuit diagram using the cells of the other cell library, the circuit correspondence table can be used to convert the circuit diagram. It is not necessary to create the cell correspondence table or copy the cell on the sending side when rewriting the circuit diagram, and the circuit diagram can be rewritten quickly.

Further, since the circuit diagram created on the sending side is rewritten to the circuit diagram using the cells on the receiving side, subsequent layout design and the like on the receiving side can be easily performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a cell correspondence table creation device of the above embodiment.

FIG. 3 is a block diagram showing a configuration of a logic circuit diagram conversion device of the above embodiment.

FIG. 4 is an explanatory diagram showing corresponding cells of different cell libraries.

FIG. 5 is a configuration diagram of a cell correspondence table of the above embodiment.

FIG. 6 is a display diagram showing a logic circuit diagram created on the sending side.

FIG. 7 is a display diagram showing a logical circuit diagram replacement operation on the receiving side.

[Explanation of symbols]

 1 CAD System 2 CAD System 3 Circuit Conversion Device 4 Cell Correspondence Table Creation Device 5 Logical Circuit Diagram Conversion Device 6 Cell Correspondence Table 11 Cell Library 12 Circuit Diagram Creation Device 21 Cell Library 41 CPU 42 Library Reading Unit 43 Function Information / Symbol Storage Unit 44 Function Extraction Section 45 Function Comparison Section 46 Correspondence Table Creation Section 47 Correspondence Table File 51 CPU 52 Circuit Diagram Reading Section 53 Circuit Diagram Copying Section 54 Cell Correspondence Table Reading Section 55 Cell Conversion Section 56 Display Section 57 Read Circuit Information Storage Section

Claims (2)

[Claims] 1. A cell correspondence table creating device for creating a cell correspondence table of a heterogeneous cell library having functionally corresponding cell names, pin names, and symbol shapes different from each other, the library reading means, the function extracting means, and the function comparison. And a correspondence table creation means and a correspondence table file. The library reading means reads the function information of each cell and the shape of the symbol from the heterogeneous cell library, and the function extraction means functions information of each cell of each heterogeneous cell library. Then, the function comparing means compares the function information of each extracted cell of each different type cell library, checks whether the cell of one cell library can be replaced with the cell of the other cell library, and the correspondence table creating means replaces it. Create a cell correspondence table in which the cells of each possible heterogeneous cell library are made to correspond one-to-one, and the correspondence table file stores the created cell correspondence table. Cell correspondence table creating device according to claim Rukoto. 2. A CA using a heterogeneous cell library having functionally corresponding cell names, pin names, and symbol shapes different from each other.
A drawing conversion device between D systems, which has a cell correspondence table creation device and a logic circuit diagram conversion device, and the cell correspondence table creation device corresponds to a library reading means, a function extraction means, a function comparison means, and a correspondence table creation means. A table reading file is provided, the library reading means reads the function information of each cell and the shape of the symbol from the heterogeneous cell library, the function extracting means extracts the function information of each cell of each heterogeneous cell library, and the function comparing means The function information of each extracted cell of different kinds of cell libraries is compared, and it is checked whether the cells of one cell library can be replaced with the cells of the other cell library. Create a cell correspondence table in which one-to-one correspondence is made, the correspondence table file stores the created cell correspondence table, and the logic circuit diagram conversion device reads the circuit diagram. It has a reading means, a cell correspondence table reading means, a circuit diagram copying means, and a cell converting means. The circuit diagram reading means reads the circuit diagram information of the logic circuit diagram using the cells of one cell library, and the circuit diagram copying means. Reads the circuit diagram from the read circuit diagram information, and the cell correspondence table reading means reads the cell of the other cell library corresponding to the cell used in the copied circuit diagram from the cell correspondence table of the cell correspondence table creating device. The drawing conversion device, wherein the cell conversion means replaces each cell of the copied circuit diagram with the cell of the other cell library that has been read to rewrite the circuit diagram.