JPH05282400A - Automatic generating method for mask pattern of general-purpose rom part - Google Patents

Abstract

PURPOSE:To generate the mask patterns with a single device to various types of LSI chips by preparing the ROM part layout information and the ROM part cell information on each chip in the form of a library. CONSTITUTION:When the prepared input data are read, a necessary layout is read out of the ROM part layout information prepared as a library and set at a ROM part layout processing part. Then the ROM part layout processing is carried out based on the ROM part layout information. Then the necessary ROM cell information is set at a mask pattern generating part out of a prepared ROM cell information library. Thus a mask pattern is generated. Then the data are outputted to a mask pattern output part and the generation of the mask pattern is completed. In other words, it is just required to add the layout information and the cell information corresponding to a new chip to the library in order to deal with the new chip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mask pattern automatic generation method for storing data in a ROM portion mounted on an LSI such as a mask ROM or a one-chip microcomputer.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional method for automatically generating a mask pattern in a ROM. First, the prepared input data is read. Next, which LSI chip is to be processed is determined. In advance, Chip A, Chip B, Chip C, ...
The ROM section mask pattern automatic generation device for each LSI chip is constructed separately, and the chips are selected at this stage. Then, the ROM mask pattern automatic generation device corresponding to the selected chip is activated, and the processing is performed according to the read input data,
Output mask pattern and exit.

[0003]

In the conventional mask pattern generation method described above, an automatic mask pattern generation device including a ROM layout processing unit and a mask pattern generation unit is prepared in advance for each type of chip. The ROM section layout processing section includes a ROM corresponding to the corresponding LSI chip.
Part layout information is set, and ROM cell information corresponding to the LSI chip is set in the mask pattern generation unit. In such a conventional method, since a large-scale device must be prepared for each LSI chip, the expandability of the device is poor, and it is difficult to incorporate a new chip and difficult to manage.

An object of the present invention is to provide various LSIs with one device.
An object is to provide a ROM mask pattern automatic generation method capable of generating a mask pattern corresponding to a chip.

[0005]

The present invention is a mask RO.
RO to be mounted on LSI chips such as M and 1-chip microcomputers
Since data is recorded in the M part, ROM input data and LS
In the process of laying out the layout information of the ROM section on the I chip and automatically generating a mask pattern, RO
M section layout information library and ROM cell information library are prepared, and desired ROM section layout information and ROM cell information are loaded from these libraries to perform ROM section layout processing and then ROM section mask pattern generation. Is characterized by.

[0006]

According to the present invention, since the ROM layout information and the ROM cell information for each chip are provided as a library, necessary information is read from the library to one ROM mask pattern automatic generation device. The mask pattern output of various LSI chips can be obtained by setting the above.

FIG. 2 shows the procedure of the method for automatically generating a mask pattern in the ROM section according to the present invention.

When the prepared input data is read, a necessary layout is read out from the ROM section layout information prepared as a library and set in the ROM section layout processing section. And R based on that information
OM layout processing is performed. Next, necessary ROM cell information is set in the mask pattern generation unit from the ROM cell information library prepared in advance, and mask pattern generation processing is performed. After the above processing is performed, the data is output to the mask pattern output unit and the process ends.

[0009]

FIG. 3 shows a concrete example of generating a mask pattern by the automatic generation method according to the present invention. ROM
The input data consists of address and data pair information. When this input data is read, the input data is subsequently passed to the ROM layout processing section. At this stage,
The ROM section origin information, ROM section pitch, and ROM section address order information for each of the X and Y axes are read out from the library and set. When the ROM section layout process is completed, the output is subsequently sent to the ROM section mask pattern generation section. At this stage, the ROM section cell information is read from the ROM section cell information library and set. After the above processing is completed, the mask pattern is output from the ROM mask pattern output unit.

[0010]

According to the present invention, in order to deal with a new chip, it is sufficient to add layout information and cell information corresponding to the chip to the library. It is not necessary to prepare the ROM section mask pattern automatic generation device for each chip.

[Brief description of drawings]

FIG. 1 is a diagram showing a conventional method for automatically generating a mask pattern in a ROM section.

FIG. 2 is a diagram showing a method for automatically generating a ROM mask pattern according to the present invention.

FIG. 3 is a diagram showing an embodiment of the present invention.

Claims (1)

[Claims] 1. An LS such as a mask ROM or a one-chip microcomputer
In order to record data in the ROM section mounted on the I-chip,
A ROM section layout information library and a ROM cell information library are prepared in advance in the process of laying out the ROM input data and the layout information of the ROM section on the LSI chip and automatically generating a mask pattern. A general-purpose ROM section mask pattern automatic generation method, characterized by loading section layout information and ROM cell information and performing ROM section layout processing and then ROM section mask pattern generation.