JPS61278099A - Memory module - Google Patents

Abstract

PURPOSE:To obtain the titled memory module which can write and erase a program, etc., and also to obtain it at a low cost, by mounting and sealing a mask ROM and a ROM which can write and erase, in the same package. CONSTITUTION:For instance, a mask ROM 1 in which a data of a Chinese character of the first level of JIS has been stored, and a ROM in which a data of an external character has been stored, and which can execute write and erasion are mounted and sealed in the same package, and in case of reading Chinese character data, a signal is inputted from the first chip enable input terminal CE1, the mask ROM 1 operates, a data call signal is inputted from address input terminals A0-A16, and a data signal is outputted from data input/ output terminals D1-D8. In case of reading the external character data, a signal is inputted from the second chip enable input terminal CE2 so that the ROM 2 is operated. A signal is inputted from a write enable input terminal WE, the ROM 2 is operated, and the external character data signal is inputted to the ROM 2 from the data input/output terminals D1-D8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a memory module in which, for example, a Kanji mask ROM or the like is mounted in a package.

[Technical deficiencies of the invention and its problems] Mask ROMs have conventionally been widely used as fixed memories for generating, for example, character patterns of Chinese characters. usually,
When a memory module is constructed by mounting a mask ROM, the bare depth of the mask ROM is mounted and sealed together with the other memory element in the same package.

Memory modules that generate such kanji character patterns generally store kanji character patterns that comply with JIS 1st and 2nd standards, and other character (external character) patterns are stored in separate memory. It is necessary to do so.

As a memory module to be stored in a separate memory, a mask ROM containing a custom character pattern is developed upon request, and the mask ROM is mounted in the memory module, but this method is difficult to implement due to the cost and production lead time. There is a problem with this. In addition, as another memory module that stores data in a separate memory, there is an ultraviolet erasable EPR for external character patterns.
The OM is mounted and sealed together with other memory elements in the same package, but in this case there is a problem that programs cannot be written or erased in the ultraviolet erasable EPROM. Furthermore, some memory modules are provided with ultraviolet-transmissive windows for writing and erasing programs, but these require a special structure and are expensive.

[Object of the Invention] The present invention was made to solve these problems, and an object thereof is to provide a low-cost memory module in which programs, data, etc. can be written and erased.

[Summary of the Invention] In other words, the memory module of the present invention includes a mask ROM and a writable and erasable ROM in the same package.
By mounting and sealing the package and providing the package with terminals for electrically connecting it to the outside, programs, data, etc. can be written and erased, and the cost can be reduced.

[Embodiments of the invention] DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the circuit configuration of this embodiment, and FIG. 2 is a diagram showing the arrangement of terminals of the memory module of this embodiment.

In other words, in the figure, 1 has a storage capacity of 1 Mbit, and 1
a mask ROM in which a 6x16 dot JIS level 1 kanji character pattern (hereinafter referred to as data) is stored;
2 has a storage capacity of 64 bits and stores external character data U) ROM that can be written and erased, △o”A+s is a mask ROMI and RO that can be written and erased
Address input terminals to which a binary electric signal 8 (hereinafter simply referred to as a signal) for calling data read from M2 is input, and D+ to D8 can be written and erased as well as the mask R-OM1. ROM2 that outputs the data read from ROM2 as a signal and can be written and erased! CEl is the first chip enable input terminal that switches the operation when reading data from mask ROM1, and CF2 is ROM2 that can be written and erased.
WF is the second chip enable input terminal that switches the operation when reading data. Input terminals are shown. In addition, mask ROM1 and RO that can be written and erased
M2 is mounted and sealed in the same package (not shown), and as shown in FIG. 2, the DTP-shaped terminal Ao is electrically connected to the outside in this package.
~A16, D1~D8, CEl, CF2, and WE are provided.

In the memory module of this embodiment configured in this way, when data of JIS first level kanji is read out, a signal is input from the first chip enable input terminal GE+ to operate the mask ROM1. , mask R
OM1 operates, a signal for calling the data is input from address input terminal Ao"-A+6, and mask ROM1
The data signal read from the data input/output terminal D1
- Output from D8. Furthermore, when data of external characters other than JIS 1st level Kanji characters is read out, a signal is input from the second chip enable input terminal CE2 to operate the ROM2 that can be written and erased. Possible ROM2 operates and address input terminal A
A signal to call the data is input from o~A+2,
Data signals read from the writable and erasable ROM 2 are output from data input/output terminals D1 to DB.

In addition, when using data for external characters other than the kanji data stored in this memory module, it is necessary to store the signal of the data for that external character in the memory module, and in that case, it is possible to write and erase the data. A signal is input from the write enable input terminal WE to write and erase data in ROM2, ROM2 that can be written and erased operates, and a signal for the data of the external character is input from data input/output terminals D1 to D8. and is input to the ROM 2 which can be written and erased.

Therefore, according to the memory module mentioned above, JIS
It is also possible to store data on external characters other than first level kanji data.

In the above-described embodiment, the input data was a character pattern of Chinese characters, but the present invention is not limited to this, and can be widely used in data generation circuits such as ROMs for speech synthesis.

"Effects of the Invention" According to the memory module of the present invention described above, a mask ROM and a writable and erasable ROM are mounted in the same package, so that programs, data, etc. can be erased. and can be written at low cost.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the circuit configuration of an embodiment of the present invention, and FIG. 2 is a diagram showing the arrangement of terminals of the memory module. 1・・・・・・・・・・・・・・・Mask ROM
2...... ROM that can be written and erased △O''A l 6...Address input terminals D1 to DB・
...Data input/output terminal CE+...
...First chip enable input terminal C60... Second chip enable input terminal

Claims (1)

[Claims] (1) A memory module characterized in that a mask ROM and a writable and erasable ROM are mounted and sealed in the same package, and the package is provided with terminals for electrical connection to the outside.