JPS626480A - Memory module - Google Patents

Abstract

PURPOSE:To obtain a small-sized and light-weighted memory module to be easily produced so that programs or data can be written in it by connecting the 1st package memory to the 2nd package memory without using a terminal having an operation switching function. CONSTITUTION:The 1st package memory 1 having 1M-bits storage capacity and including a mask ROM storing the character pattern data of 'kanji' (Chinese character) belonging to the 1st level of JIS is mounted on a substrate and the 2nd package memory 3 having 256K-bits storage capacity and including an ultraviolet erasing type EPROM storing external character data is mounted on the 1st package memory 1 through an IC socket 2 for the 1st package memory 1. The terminals having the same function are connected through the IC socket without using the terminal having the operation switching function between the external I/O terminal 4 of the 1st package memory 1 and the external I/O terminal 5 of the 2nd package memory 3. Consequently, programs or data can be written in the memory module and the size-reduced and light-weighted memory module can be easily produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a memory module that generates character patterns of Chinese characters used, for example, in word processors.

[Technical Background of the Invention and its Problems] Mask ROMs have conventionally been widely used as fixed memories for generating character patterns of kanji characters in word processors, for example.

Normally, when a memory module is constructed by mounting this mask ROM, a pair of chips of the mask ROM is mounted in a package and sealed.

The memory module that generates such kanji character patterns generally stores kanji character patterns that comply with JIS 1st and 2nd standards, and character patterns of other characters, so-called non-standard characters, are stored in another memory. need to be memorized.

Conventionally, character patterns for such external characters have been stored in external memory such as a floppy disk, and when the external characters are required, they can be generated by transferring them from the external memory to the RAM of a word processor and accessing them. was.

However, with this method, it is impossible to mount a floppy disk in recently developed small and lightweight portable word processors due to power consumption and mold opening requirements.

Therefore, in such portable word processors and the like, mask ROMs containing character patterns of external characters have been developed in response to requests, and the mask ROMs have been mounted in memory modules.

However, in such memory modules,
There were many problems in terms of price and production lead time.

[Purpose of the Invention] The present invention has been made to solve these problems, and its purpose is to provide a memory module in which programs, data, etc. can be written, and which is compact and can be easily manufactured. There is.

[Summary of the Invention] That is, the memory module of the present invention has a mask R on a substrate.
A first package memory containing an OM is mounted, a second package memory containing a removably writable mask ROM is mounted on the first package memory, and the first package memory and the first package memory are mounted. This device is electrically connected to the package memory of No. 2 except for the terminals having the function of switching operations, thereby making it possible to write programs, data, etc., and making it compact and easy to manufacture.

[Embodiment 1 of the Invention Hereinafter, details of an embodiment of the present invention will be described based on the drawings.

FIG. 1 is a diagram for explaining one embodiment of the present invention, FIG. 2 is a diagram showing the circuit configuration of one embodiment, and FIG. 3 is a diagram without showing the arrangement of terminals of a memory module of one embodiment. be.

As shown in FIG. 1, the memory module of this embodiment has a memory capacity of 1 Mbit on a substrate (not shown) according to the JIS standard.
A first package memory 1 containing a mask ROM in which a first level kanji character pattern (hereinafter simply referred to as data) is stored is mounted, and this first package memory 1 is mounted on this first package memory 1. A second package memory 3 containing an ultraviolet-erasable EPROM in which external character data is stored in 256-bit memory capacity is installed through the IC socket 2 of the first package memory 1, and external input/output of the first package memory 1 is carried out. The terminals 4.4...4 and the external input/output terminals 5.5...5 of the second package memory 3 have the same functions through this IC socket 2, except for the terminals that have the function of switching operations. Conductivity is established between the terminals having

In other words, as shown in FIG. 2, in the first and second package memories 1.3, a binarized electric signal (hereinafter simply referred to as "signal") for calling the written data is transmitted via the IC socket 2. address input terminals 4Ao to 4A14 of the first package memory 1 and address input terminals 5Ao to 5A1 of the second package memory 3
．． The data output terminals 4Do~ of the first package memory 1 are electrically connected and output the written data as a signal.
4D7 and the data output terminal 5 of the second package memory 3
Do to 5D7 are electrically connected and the first
The power supply terminal 4Voo of the second package memory 1 and the power supply terminal 5VPP of the second package memory 3 are electrically connected.

Also, the chip enable input/output terminal 4CE+ of the first package memory 1 receives a signal for switching the operation.
The chip enable input/output terminal 50E2 of the second package memory 3 is not electrically connected to the chip enable input/output terminal 50E2 of the second package memory 3 via the IC socket 2 of the first package memory 1. It is electrically connected to the independent external input/output terminals 4 of the first package memory 1.

Also, the external input/output terminal 4.4 of the first package memory 1
. . 4 are arranged at predetermined positions, as shown in FIG.

In the memory module of this embodiment configured as described above, when data of JIS 1st level kanji characters is read out, the chip enable input/output terminal 4 is set so as to operate the mask ROM of the first package memory 1. A signal is input from -, this mask ROM operates, a signal to call the data is input from address input terminals 4AO to 4A+s, and a signal of data read from this mask ROM is output from data output terminals 4Do to 4D7. be done.

In addition, when data of external characters other than JIS 1st level kanji is read, the chip enable input of the first package 1 is set so that the ultraviolet erasable EPROM of the second package 3 is operated. A signal is input from below the output terminal 4, and the IC socket 2 of the first package memory 1
is connected to the chip enable input terminal 5CE2 of the second package memory 3 through the ultraviolet erasable EPR.
This signal is input to the OM and it operates, and a signal is input to call this data from the address input terminals 4Ao to 4A+4 of the first package memory 1. The signal is then input to the address input terminals 5Δ0 to 5A14 of the second package memory 3, and this signal is input to the ultraviolet erasable EFROM.

The data signal read from this ultraviolet-erasable EPROM is output from the data output terminals 5Do to 5D7 of the second package memory 3, and is sent to the first package memory 1 via the IC socket 2 of the first package memory 1. It is output from the data output terminals 4Do to 41)l of the package memory 1.

Therefore, according to the memory module mentioned above), JI
It can easily store data of external characters other than S-1 level kanji data, and can be easily manufactured with a small size of 411ffl.

In the above embodiment, the second package memory 2 includes an ultraviolet erasable EPROM, but the present invention is not limited to this, and the second package memory 2 can be written and erased. Incorporate ROM and R
Connect the /W terminal to the IC socket 2 of the first package memory 1.
External input/output terminal 4 of first package memory 1 via
Once conductive, data can be written.

[Advantages of the Invention] As explained above, according to the memory module of the present invention, the second package memory containing a removably writable ROM is mounted on the first package memory containing a mask ROM. Because of this, programs and data can be written on it, and it is also small and lightweight, making it easy to manufacture.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining one embodiment of the present invention, FIG. 2 is a diagram showing the circuit configuration of one embodiment, and FIG. 3 is a diagram showing the arrangement of terminals of a memory module of one embodiment. . 1...First package memory 2...
......IC socket 3......Second package memory 4.4.
・・４． 5.5...5... External input/output terminal applicant
Toshiba Corporation Patent Attorney Satoshi Suyama - Figure 1 Figure 2

Claims (1)

[Claims] (1) A first package memory containing a mask ROM is mounted on the substrate, a second package memory containing a removably writable mask ROM is mounted on the first package memory, and a second package memory containing a removably writable mask ROM is mounted on the first package memory. 1. A memory module characterized in that terminals having the same function except for a terminal having a function of switching operations between the first package memory and the second package memory are electrically connected.