JPS61105798A - P rom ic - Google Patents

Abstract

PURPOSE:To enable a storing of write-data names correspondent to the write data in a PROM (programmable read only memory) IC by providing a circuit dedicated to the write/read control to the write-data-name storing memory cell. CONSTITUTION:The write-data-name storing memory cell 7 is provided in the PROM memory cell 3. The writing in and reading out from the cell 7 are controlled through the decoder and the selecting circuit 8 that are dedicated to the cell 7. With this configuration, there is no necessity of writing names by imprinting and reading them out, and thus the PROM IC is made able to store the write names correspondent to the write data which are also able to be read out.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is directed to F ROM IC (PROGRAM MABLE)
This relates to the circuit configuration of the READ ONLY MEMORY IC.

(Prior Art) Conventionally, an F ROM IC, as shown in FIG. 2, has a row address decoder, 12 column address decoders, and 2. memory cell 3
．． Data selector 4. Output control circuit 5. Output 2 fufuful 3 has address signal A. -An, An+1 ~ AlTl
The corresponding data is written to the master side,
Storing other write data such as product name, etc.
It was impossible. Therefore, these P I' (OMIC usually uses the write data product name corresponding to the write data as FRO
(The stamp is manually stamped on the surface of the MIC package.)9
Implemented in the package.

(Problems to be Solved by the Invention) However, in the case of FROM IC, there are the following drawbacks due to high-mix, low-volume production.

First, there are many cases where the written data and the written data product name are different due to a stamping error, which is detected during package inspection or equipment inspection, and causes an increase in the number of man-hours for replacement.

Second, in the case of stamping, the characters are irregular and unclear, making it difficult to construct an automated system for subsequent inspection and manufacturing processes.

Thirdly, when used as a master IC, if management is insufficient, the stamp display becomes unclear as described above, making it impossible to distinguish it from other master ICs and making it unusable.

An object of the present invention is to provide a FROM IC that can store write data and the corresponding write data product name.

(Means for Solving the Problems) The present invention includes a plurality of word memory cells for storing write data product names, and a circuit for controlling data writing and reading with respect to the memory cells. F
It is a ROM IC.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the circuit configuration of the F ROM IC according to the present invention. In FIG. 1, the F ROM IC has an address signal An
A row address decoder 1 composed of 4-1 to Am is connected to the memory cell 3. Also, the address Shinyumi Am-
A decoder & selection circuit 8 constituted by 2 to Am and a selection signal 8 is connected to a memory cell for storing a write data product name of 8 words, which is provided individually in the memory cell 3.

A data selector 4 is connected to the memory cell 3 and the memory 7 for storing the write data product name, and an address signal A is connected to this. -Column address decoder 2 consisting of An
is connected.

Further, the data selector 4 and the output control circuit 5 are connected to the output buffer circuit 6, and control read and write data.

Next, the operation of the FROM IC according to the present invention will be explained.

In the decoder & selection circuit 8, the selection signal TS is
In the case of the OI+ level, one of the words of the memory cell for storing the write data product name consisting of 8 words is selected from the address signals Am- to Am-.

Address signal Ao-A to column address decoder 2
The bit line is selected by n and the data selector 4, and the output control signal C and the output control circuit 5 enable writing to and reading from the write data product name storage memory self.

When the selection signal I8 is level "1", the memory cell for storing the write data product name is not selected, and the memory cell 3 for the original write data is selected.

Regarding the writing and reading methods, the conventional F ROMI
Since it is similar to C, the explanation will be omitted here.

Next, a usage example of the F ROM IC according to the present invention will be explained. First, it is assumed that write data and a write data product name corresponding to the data are stored in the PROM IC writing device. F ROM I in the P ROM IC writing device
When C is inserted and the write operation is started, the write data is written to memory cell 3 first, and if the data is good, the memory cell for storing the write data product name is selected, and the write data product name is stored. Writing ends.

When stamping the F ROM IC after Iwakomi in an automated stamping process, if the contents of the memory self for storing the written data product name are read and the corresponding stamp is performed, there will be no stamping mistakes, and a wide variety of products in small quantities can be produced. It has an effect on production.

In addition, even when performing PROMIC function and AC characteristic tests afterwards, it is easier to automate the process by reading the written data product name to index the necessary test data and inputting it into the F ROMIC test equipment, thereby reducing errors caused by manual intervention. reduction is possible.

In addition to the above, during the electrical inspection after mounting the socket, the mounted F ROM IC can be inspected by simply reading the written data product name and checking the version number of the mounting position data.
can be guaranteed.

(Effects of the Invention) As explained below, the present invention includes a memory cell for storing the product name of write data and a circuit for controlling data writing and reading to the memory cell, so that it is possible to reduce the number of products and products that are unique to F ROM ICs. An automated system suitable for production can be easily realized. - During electrical inspection after shoe cage mounting, the mounting position and written data version number etc. can be confirmed by simply reading the written data product name. F ROM
This has the effect of guaranteeing the IC.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an F ROM IC according to the present invention, and FIG. 2 is a circuit diagram of a conventional F ROM IC. 1... Row address decoder, 2... Column address decoder, 3... Memory cell, 4... Data decoder,
5... Output control circuit, 6... Output buffer circuit, 7
...Memory cell for storing write data product name, 8...Decoder & selection circuit Ryo 1 Figure 0 pi 071 Figure 2

Claims (1)

[Claims] (1) A P characterized by comprising a memory cell of multiple words for storing the write data product name and a circuit for controlling data writing and reading to the memory cell.
ROMIC.