JPH09147592A - Rom writer with rom eraser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically execute a series of works of data erasing and data writing by forming an integrated structure of a data erasing means and a data writing means. SOLUTION: The number of times of writing operations and the product number are read from the particular address of a programmable ROM (EPROM) 100 to be inserted to an IC socket of a ROM writer 102 and data is transferred to the control means 104. The control means 104 compares the transfer data with the corresponding threshold value on the basis of the threshold value table selected previously by a user. When the number of times of writing operations is smaller than the threshold value, the ROM eraser 101 is turned on and ultraviolet ray is applied erase the data. Next, the renewal data is added to the program data and then written into EPROM 100 by the increment of the number of times of reading operation from EPROM 100. Accordingly, erasing of old data and writing of new data can be done automatically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called EP, which is an electrically rewritable ROM for storing program data in software development of a microcomputer.
ROM (Erasable and Program
ROM writer and ROM for rewriting program data of "able Read-Only Memory"
The present invention relates to a ROM writer with a ROM eraser having a ROM eraser for erasing contents.

[0002]

2. Description of the Related Art Conventionally, during software development of a microcomputer, when debugging a program or updating program data, the program data is repeatedly rewritten to the same EPROM, or a used EPROM is replaced with a ROM eraser. Erased and reused multiple times.

Further, when rewriting the data in the EPROM, a ROM eraser and a ROM writer are separately prepared, and first, for example, ultraviolet rays are applied to the EPROM to be rewritten by using the ROM eraser. The work of erasing data and then writing new data to the EPROM that has been erased by using a ROM writer has been separately performed.

[0004]

However, in the conventional technique as described above, at the software development stage of the microcomputer, the EPROM is written a plurality of times in the situation where the number of writing is not controlled. If the program data is rewritten or the used EPROM is used frequently, the EPROM is likely to include an EPROM that is deteriorated and does not function normally, and the reliability thereof is deteriorated. Furthermore, the replacement work for finding a good EPROM must be carried out by trial and error, and the efficiency of the data writing work is reduced.

When an EPROM on which data has been written / erased a plurality of times is reused, its deterioration over time causes
There is also a problem that the data in the EPROM has a high possibility of being changed (altered) and its reliability is lowered.

Further, when rewriting the data in the EPROM, first, the ROM eraser is used to erase the old data in the EPROM to be rewritten, and then the ROM writer is used to perform the erasing process by the ROM eraser. Since the work of writing new data to the EPROM is performed separately, there is also a problem that the work takes time.

The present invention has been made in view of the above, and makes it possible to automatically perform a series of work of erasing data by a ROM eraser and writing data by a ROM writer, and improve the work efficiency. The first purpose is to improve.

A second object of the present invention is to improve the reliability of the EPROM by enabling management of availability and deterioration of the EPROM and enabling confirmation of the management information at the time of writing data. .

[0009]

To achieve the above object, in a ROM writer with a ROM eraser according to a first aspect of the present invention, data in a programmable ROM (EPROM) capable of erasing program data is stored. The data erasing means for erasing and the data writing means for writing new data in the programmable ROM (EPROM) from which the data has been erased by the data erasing means are integrally configured.

That is, the data erasing means for erasing the data of the EPROM and the data writing means for writing the data are integrally configured so that a series of operations of erasing the old data and the new data of the EPROM can be automatically performed. To

The ROM writer with a ROM eraser according to a second aspect of the present invention further comprises control means for controlling the data erasing means and the data writing means,
Before erasing the EPROM data, the EPROM data is erased after the number of writings to the EPROM and the product number are transferred to the control means at a specific address of the EPROM.

That is, by writing the data of how many times the program data has been written in a specific address of the EPROM and managing this data, the usability and deterioration of the EPROM can be managed accurately.

Further, in the ROM writer with the ROM eraser according to the third aspect, a personal computer is used as the control means.

That is, by using a personal computer as the control means, a relatively simple and general-purpose configuration can be realized without preparing a special control device.

Further, in the ROM writer with a ROM eraser according to a fourth aspect of the present invention, the control means displays the number of writings written in the specific address of the EPROM transferred from the data writing means. Equipped with means, EP
The number of writings is updated by adding 1 to the number of writings in the ROM,
The data is transferred to the data writing means.

That is, by displaying the number of times of writing in the EPROM, it is possible to confirm in advance whether the EPROM is usable or deteriorated.

Further, in the ROM writer with a ROM eraser according to a fifth aspect, the control means compares the data transferred from the data writing means with a threshold value provided in advance, and the threshold value is set. When the data is larger than the value, an EPROM replacement instruction is displayed on the display means.

That is, by displaying the number of times of writing of the EPROM and the necessity of replacement, it is possible to confirm in advance whether the EPROM is usable or deteriorated.

Further, in the ROM writer with a ROM eraser according to a sixth aspect, the threshold value is EPRO.
For each type of M, a normal distribution of the number of times of writing until writing failure is obtained, and the value is −3σ (standard deviation).

That is, the deterioration degree of the EPROM and the necessity of replacement are determined by taking a normal distribution of the number of times of writing until the writing failure occurs for each type of EPROM and based on the value of -3σ (standard deviation). With less deterioration,
After selecting the ROM, new writing can be performed on the EPROM.

Further, in the ROM writer with a ROM eraser according to a seventh aspect, the threshold value is EPRO.
The optimum value is obtained by learning the relationship between the number of times of writing and the number of years of holding data for each type of M.

That is, the degree of deterioration of the EPROM and the necessity of replacement are determined based on the optimum value obtained by learning the relationship between the number of times of writing and the number of years of holding data for each type of EPROM. EPR with less deterioration
After selecting the OM, new writing can be performed to the EPROM.

Further, in the ROM writer with ROM eraser according to the eighth aspect, the control means is the EPRO.
For each type of M, a normal distribution of the number of times of writing until a writing failure occurs is taken, and a first threshold value having a value of −3σ (standard deviation) as a threshold value and writing for each type of EPROM This is to selectively use a second threshold value having an optimum value obtained by learning the relationship between the number of inclusions and the number of years of data retention.

That is, a normal distribution of the number of times of writing until a writing failure occurs is taken for each type of EPROM, and -3σ
A first threshold having a value of (standard deviation) as a threshold,
By selectively using a second threshold value having a threshold value that is an optimum value obtained by learning the relationship between the number of times of writing and the number of years of data retention for each type of EPROM, It is possible to newly write to the EPROM after selecting the EPROM according to conditions such as the purpose of use and storage state.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[Embodiment] (Arrangement of Embodiment) FIG. 1 is a block diagram showing the system arrangement of a ROM writer with a ROM eraser according to this embodiment. In the figure, 101 is a ROM eraser section as a data erasing means for erasing the data written in the EPROM 100 by irradiating the erasing window of the EPROM 100 with ultraviolet rays, and 102 is reading data from the EPROM 100 or writing data in the EPROM 100. A ROM writer unit as a data writing means.

Reference numeral 103 denotes a personal computer, a ROM eraser unit 101, and a ROM writer unit 102.
A PC / IF unit which is an interface circuit with the ROM eraser unit 101 and a ROM writer unit 102.
Control, and have the optimum threshold value in the table.
Equipped with a program to determine the necessity of M100 replacement,
It is a control unit (control unit 104 is hereinafter referred to as PC 104) as a control unit using a personal computer that displays a result of determining whether or not the EPROM 100 needs to be replaced. Further, the PC 104 is provided with a display unit 105 as a display means.

It should be noted that the EPROM 100 has the number of times of writing to the EPROM 100 and the EPRO at the specific address.
The product number of M100 is written.

(Operation of Embodiment) Next, the system operation of the ROM writer with ROM eraser configured as described above will be described in detail with reference to the flowchart shown in FIG.

FIG. 2 is a flow chart showing the operation of the ROM writer with ROM eraser shown in FIG. In FIG. 2, when writing other program data to the EPROM 100, first, a threshold value table of the number of writings is displayed on the PC 104 on the display unit 105, and the threshold value table is selected (S201).

As the threshold value table, firstly, the threshold value is a value of -3σ (standard deviation) in the normal distribution of the number of times of writing until writing failure occurs for each type of EPROM 100. First table and second, EPROM1
Two types of second tables are prepared with the optimum value obtained by learning the relationship between the number of times of writing and the number of years of data retention in the EPROM 100 as a threshold value for each type of 00.

When the threshold table is selected, RO
EPR inserted in the IC socket of the M lighter unit 102
Number of writes from specific address of OM100 and EPROM1
The product number of 00 is read (S202). Further, the read data is transferred to the connected PC 104 (S203).

Next, the PC 104 displays the number of times of writing on the display unit 105 (S204), and based on the table previously selected by the user, the threshold value corresponding to the transfer data (the number of times of writing and the type) is set. Compare (S20
5) If it is determined that the number of writings is larger than the threshold value, the EPROM 100 is displayed on the display unit 105 so as to be replaced (S206).

On the contrary, in step S205,
If it is judged that the number of writings is smaller than the threshold value, P
The C104 turns on the ROM eraser unit 101 and irradiates the EPROM 100 with ultraviolet rays (S207).
When the data in the EPROM 100 is erased after a lapse of a certain time, the ROM eraser unit 101 causes the PC 104 to erase the data.
Is interrupted (S208).

The PC 104 that has received the interrupt sends EPRO
By incrementing the write count read from M100 by 1, the update data is added to the program data, and the data is written to the EPROM 100 (S
By 209), a series of processing is completed.

(Effects of Embodiments) Next, the effects of the above embodiments will be listed.

First, conventionally, when rewriting data in an EPROM, the ROM eraser is used first to erase the EPROM data, and then the ROM writer erases the erased E data.
Although the PROM is inserted and the update data is written, in the present embodiment, the ROM eraser unit 101 and the ROM writer unit 102 are integrated, and a series of data erasing and data writing operations are automatically and continuously performed. You can do it, so E
The workability of rewriting the data of the PROM 100 is dramatically improved.

Second, the EPR written in a specific address of the EPROM 100 before the data in the EPROM 100 is erased.
Information such as the number of writings to the OM100 and the product number is displayed on the PC 104.
The first function of erasing the data in the EPROM 100 after the transfer to the
A second function for displaying and notifying on the display unit 105 of C104, and EPROM 100 when data writing is completed
Since the third function for updating the write count data of 1 is provided, the deterioration state of the EPROM 100 can be reliably managed, and the deterioration state of the EPROM 100 can be confirmed in advance before writing the program data. it can.

Third, by using a highly reliable EPROM 100 corresponding to the purpose by setting a threshold value according to the purpose of using the EPROM 100, for example, whether data retention years are required or not. In addition, it is possible to easily know when to replace the EPROM 100.

[0040]

As described above, the RO according to the present invention
According to the ROM writer with M eraser (Claim 1),
Since the data erasing means for erasing the data of the EPROM and the data writing means for writing the data are integrated, it becomes possible to automatically perform a series of operations of erasing the old data and writing the new data of the EPROM. The sexuality is dramatically improved.

Further, the ROM with ROM eraser according to the present invention
According to the OM writer (Claim 2), the number of times the program data has been written is written in a specific address of the EPROM, and this data is managed.
It is possible to accurately manage the usability state and deterioration state of M, and perform accurate work.

In addition, the R with ROM eraser according to the present invention
According to the OM writer (claim 3), since a personal computer is used as the control means, a relatively simple and general-purpose configuration can be achieved without preparing a special control device.

In addition, the R with ROM eraser according to the present invention
According to the OM writer (claim 4), since the number of times of writing in the EPROM is displayed, it is possible to confirm in advance whether the EPROM is usable or deteriorated.

In addition, R with a ROM eraser according to the present invention
According to the OM writer (Claim 5), since the number of writings of the EPROM and the necessity of replacement are displayed, it is possible to confirm in advance whether the EPROM is usable or deteriorated.

In addition, R with a ROM eraser according to the present invention
According to the OM writer (claim 6), the degree of deterioration of the EPROM and the necessity of replacement are determined by taking a normal distribution of the number of times of writing until writing failure occurs for each type of EPROM, and
Since it is performed based on the value of 3σ (standard deviation), it is possible to newly write to the EPROM after selecting the EPROM with less deterioration.

In addition, the R with ROM eraser according to the present invention
According to the OM writer (Claim 7), it is possible to determine the degree of deterioration of the EPROM and the necessity of replacement by learning the relationship between the number of times of writing and the number of years of holding data for each type of EPROM. Since it is performed based on the value, it is possible to newly write to the EPROM after selecting the EPROM with less deterioration.

In addition, R with a ROM eraser according to the present invention
According to the OM writer (claim 8), the normal distribution of the number of times of writing until the writing failure occurs is taken for each type of EPROM, and the value of -3σ (standard deviation) is used as the threshold value.
And a second threshold having an optimum value obtained by learning the relationship between the number of writings and the number of years data is stored for each EPROM type as a threshold. Since the EPROM is used, it is possible to newly write to the EPROM after selecting the EPROM according to conditions such as the purpose of use of the EPROM and the storage state.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration of a ROM writer with a ROM eraser according to an embodiment.

FIG. 2 is a flowchart showing an operation of the ROM writer with a ROM eraser shown in FIG.

[Explanation of symbols]

100 EPROM 101 ROM
Eraser section 102 ROM writer section 103 PC
I / F unit 104 Control unit (PC) 105 Display unit

Claims (8)

[Claims] 1. Data erasing means for erasing data in a programmable ROM (EPROM) capable of erasing program data, and new data is written in the programmable ROM (EPROM) from which data has been erased by the data erasing means. A ROM writer with a ROM eraser, characterized in that the data writing means is integrally configured. 2. An EPROM further comprising control means for controlling the data erasing means and the data writing means.
Before erasing the data in the
After transferring the number of times of writing to the OM and the product number to the control means,
The ROM writer with a ROM eraser according to claim 1, wherein the data in the EPROM is erased. 3. The RO according to claim 2, wherein a personal computer is used as the control means.
ROM writer with M eraser. 4. The control means comprises a display means for displaying the number of writings written in a specific address of the EPROM transferred from the data writing means, and adding 1 to the number of writings of the EPROM. 4. The ROM writer with a ROM eraser according to claim 2, wherein the number of writings is updated and transferred to the data writing means. 5. The control means compares the data transferred from the data writing means with a preset threshold value, and if the data is larger than the threshold value, an EP
The ROM writer with a ROM eraser according to claim 4, wherein a ROM replacement instruction is displayed on the display means. 6. The threshold value is a value of −3σ (standard deviation) of a normal distribution of the number of times of writing until writing failure occurs for each EPROM type. A ROM writer with a ROM eraser according to 5. 7. The threshold value is set to an optimum value obtained by learning the relationship between the number of times of writing and the number of years of holding data for each EPROM type. ROM writer with a ROM eraser. 8. The first control means takes a normal distribution of the number of times of writing until writing failure occurs for each type of EPROM, and sets a value of −3σ (standard deviation) as a threshold value. Selectively using a threshold value and a second threshold value having an optimum value as a threshold value, which is obtained by learning the relationship between the number of times of writing and the number of years of holding data for each EPROM type. R with ROM eraser according to claim 5,
OM writer.