JPH04343453A - Lsi designing apparatus - Google Patents

Abstract

PURPOSE:To prevent occurrence of mistake as much as possible and to shorten a developing time as short as possible. CONSTITUTION:A frame information data base 4 for storing frame information, input means 1a for inputting retrieving key data necessary to retrieve frame information in a frame information data base, and frame information retrieving means 2 for retrieving the data base based on the key data input by the means and discovering a frame adapted for the key data, are provided. Pad position calculating means 5 for obtaining pad positions of leads used for the frame based on the frame information of the discovered frame, is provided, and an LSI chip is laid out based on the obtained pad position. An LSI designing apparatus may include, if necessary, a chip layout means 6 for correcting the pad position as required, deciding the final pad position and sending it to the pad position calculating means, and editing/output means 7 for so editing data as to become data output format matched to an output device and sending the edited data to an output device.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LSI design device.

0002

[Prior Art] Generally, LSI development involves a product planning process, a system design process, a package selection process, a layout design process, a mask manufacturing process, a pellet prototyping process, an assembly process, an evaluation process, and a mass production process, as shown in Figure 2. It consists of each process. In recent years, the scale of LSI designs has become larger and larger, and it has become necessary to complete development in a shorter period of time. Under these circumstances, automatic layout CAD equipment (Computer
Significant time savings have been achieved with the use of ter Aided Design and improvements in the performance of these devices. However, in processes other than the layout design process, technological development using CAD is extremely slow. In particular, when LSI designers decide on a frame in which to mount a chip, they select a device based on the chip size, number of pins, etc., considering cost, mass productivity, etc., and then decide on a frame based on this selected device. was.

0003

Problems to be Solved by the Invention When determining a frame as described above, it is difficult to obtain the necessary information at once, and it is a task that requires experience and time.

[0004] Furthermore, when a layout using the determined frames is performed by an automatic layout device, it is necessary for the LSI designer himself to process the information of the determined frames. Furthermore, even after the layout is completed, in order to start manufacturing at the factory, we need to create technical documents for manufacturing confirmation such as manufacturing start request forms, bonding drawings, test boat drawings, fixed card drawings, manufacturing instructions, etc. I have to create data for this purpose. These tasks are difficult for LSI designers, and are time-consuming and prone to errors.

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to provide an LSI design device that can prevent the occurrence of mistakes as much as possible and shorten development time as much as possible. With the goal.

[0006]

[Means for Solving the Problems] An LSI design device according to the present invention includes a frame information database in which frame information is stored, a frame information storage means for storing new frame information in the frame information database, and a frame information database. an input means for inputting search key data necessary to search for frame information in the frame information database, and a frame that matches the search key data by searching the frame information database based on the search key data input by this input means. a frame information retrieval means for finding the pad position of each lead used in the frame based on the frame information of the found frame; A chip layout means that performs layout, corrects the pad position if necessary, determines the final pad position, and sends it to the pad position calculation means; and frame information data of the found frame, and the final pad position. Editing/output means for editing data so as to have a data output format suitable for an output device based on pad positions and layout information data of the LSI chip, and sending the edited data to the output device. It is characterized by the presence of

[0007]

[Operation] According to the LSI design device of the present invention configured as described above, since the necessary frame information is stored in the frame information database, there is no need to collect necessary information from many parties involved. , Necessary frame information can be retrieved by the frame information retrieval means when necessary. Then, based on the extracted frame information, the pad position of each lead of the frame is determined by the pad position calculating means and the chip layout means. These determined data are edited by the editing/output means into data suitable for the output device and output. As described above, it is possible to prevent the occurrence of mistakes as much as possible, and to shorten the development time as much as possible.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of an LSI design apparatus according to the present invention. The LSI design device of this embodiment has input/
It includes a display means 1, a frame search means 2, a frame information creation means 3, a frame information database 4, a pad position calculation means 5, a chip layout means 6, and a data editing/output means 7.

Next, the structure and operation of this embodiment will be explained.

[0010] First, an LSI designer estimates the size of an LSI based on a customer's request, taking into account the functions to be realized, and decides the type of device to be used, taking into consideration the number of pins required, cost, etc. After that, the LSI designer enters the search key data that is the key to searching for frame information, such as the number of pins, device type, desired chip size, etc.
Input is made using the keyboard 1a of the input/display means 1. Then, the input search key data is displayed on the screen 1b of the input/display means 1 by the frame information search means 2, and the LS checks whether the input search key data is correct.
I Ask the designer to confirm. The frame information database 4 is searched by the frame information search means 2 based on the confirmed search key data, all frames matching the search key data are selected, and the selected frames are displayed on the screen 1b. As this display method, for example, the names of the selected frames are displayed in a prioritized list format. Note that the frame information database 4 stores frame geometric information and frame ancillary information. Frame geometric information consists of the geometric shape of the frame, such as pin shapes, bonding positions, etc. Frame ancillary information consists of, for example, frame price, material, mass production capacity at the factory, frame specifications, usage conditions, etc. There is. Then, storing new frame information in the frame information database is as follows.
This is done by the frame information storage means 3.

[0011] From among the frame information retrieved by the frame information retrieval means 2 in this manner, the LSI designer determines a frame that meets the specifications. Then, based on the frame geometric information of the determined frame, the pad position calculation means 5 calculates ideal pad positions for all the leads used in the frame according to bonding design rules, such as the length of the bonding wire and the geometric shape of the wire.
Find it by

Based on the ideal pad position obtained, the layout of the LSI chip is performed by a chip layout means using a predetermined rule, and if the ideal pad position does not match the rule, the pad position is corrected. Layout within the chip is performed by finding pad positions that match the rules. The finally determined pad position is then sent to the pad position calculation means 5.

Based on the frame information of the determined frame, the finally determined pad position which is the output of the pad position calculation means 5, and the layout information within the chip which is the output of the chip layout means 6, The data editing/output means 7 edits the data so that it has an output format suitable for the specified output device, and sends the edited data to the specified output device. For example, if one of the specified output devices is a plotter, a bonding plot diagram created by the LSI designer for the purpose of checking the final bonding status, or a bonding plot diagram assigned to each device pin of the package that houses the designed LSI chip. Package plot diagrams created to check the signal names that have been detected, factory bonding plot diagrams used by factory manufacturing workers to check whether the products flowing in the work process are flowing in the correct state, etc. Edit and output the data to create. If the other designated output device is a printer, the data for outputting the plotter data in the form of a technical document is edited and output. Furthermore, data necessary to control the bonding machine, position information for stretching bonding wires between each lead and pad, etc. are edited and output to the bonding machine.

As described above, according to this embodiment, there is no need to collect necessary information from many parties involved, and it is possible to determine frames to be used in a product without error. Further, by editing and outputting the obtained data, it is possible to prevent the occurrence of mistakes as much as possible, and to shorten the development time as much as possible.

In the above embodiment, the LSI designer determines a frame that meets the specifications from among the frame information retrieved by the frame information retrieval means 2, but the frame information retrieval means 2 automatically determines the frame that meets the specifications. You may decide.

[0016]

According to the present invention, the occurrence of mistakes can be prevented as much as possible, and the development time can be shortened as much as possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an LSI design apparatus according to the present invention.

FIG. 2 is a flowchart showing the process of LSI design.

[Explanation of symbols]

1 Input/display means 2 Frame information search means 3 Frame information storage means 4 Frame information database 5 Pad position calculation means 6 Chip layout means 7 Data editing/output means

Claims (1)

[Claims] 1. A frame information database in which frame information is stored; frame information storage means for storing new frame information in the frame information database;
An input means for inputting search key data necessary to search frame information in the frame information database, and search key data for searching the frame information database based on the search key data inputted by the input means. frame information searching means for finding a matching frame; pad position calculating means for finding the pad position of each lead used in the frame based on the frame information of the found frame; a chip layout means for laying out an LSI chip, correcting the pad position if necessary to determine a final pad position, and transmitting the final pad position to a pad position calculation means; frame information data of the found frame; Editing/output means for editing data to have a data output format suitable for an output device based on final pad positions and LSI chip layout information data, and sending the edited data to the output device; An LSI design device comprising: