JPH01213896A - Uv-prom erasing device - Google Patents

Abstract

PURPOSE:To easily execute the confirmation of a sample, for which erasing is completed, and accordingly to erase a waste to irradiate ultraviolet rays to the erased sample for an excess time by additionally providing a detecting means to detect erase end in a UV-PROM erasing device which can be erased by the ultraviolet rays. CONSTITUTION:The erasing device is composed of a CPU1, a ROM2, to which a series of processing programs are written, a RAM3 for work, a ultraviolet rays irradiating device 4, an IC setting stand 5, a turning-off completing lamp turning-on device 6, an address/data bus 7 and a latch circuit 8. Thus, a sample A of the setting stand 5 is selected and a first address is given from the CPU1. Then, an output is accumulated in a latch A of the circuit 8 and contents are read. Whether the contents are data to be erased by the CPU1 or not is compared. In case of the erased data, the next address is given to the sample A. Such operation is repeated to all the addresses and when the data are erased, the CPU1 is operated and a lamp A is turned on. Thus, the erasing is executed in a short time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to UV-PROM (Ultra Violet
-ProgranableRead 0nly Ma
(nory) erasing device.

[Conventional technology]

A conventional UV-PROM erasing device erases data in the UV-PROM by placing the UV-PROM IC under an ultraviolet lamp and irradiating the IC with ultraviolet light for an appropriate period of time.

[Problem to be solved by the invention]

The above-mentioned conventional UV-PROM erasing device cannot predict the end time of erasure, so it must be confirmed with a KEPROM writer to confirm erasure.If it is not completely erased, check again. It was very troublesome because it had to be deleted. Furthermore, even if the data has been completely erased, there is a drawback that the time from the completion of erasure to confirmation of erasure is wasted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a UV-PROM erasing device which solves the above-mentioned drawbacks and allows complete erasing with extreme ease.

[Means to solve the problem]

The configuration of the UV-PROM erasing device of the present invention is characterized in that means for detecting the completion of erasure is provided.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a UV-PROM eraser according to an embodiment of the present invention. In the same figure, this device has a CPU
, a ROM 2 in which a series of processing programs are written, a work RAM 3, an ultraviolet irradiation device 4, a sample stand 5 for placing an IC, an erase completion lamp lighting device 6, and an address/data bus 7. , configured.

In this example, the number of samples is 2, and samples A and A, respectively.
Let it be B.

First, sample A on the sample stage 5 is selected, a first address is given by the CPU, and the data of sample A is stored in latch A of the data latch circuit. next,
The contents of latch A are read out and compared to determine whether the data is erased by the CPU 1, that is, data FFH. As a result, if the data is erased, the next address is given to sample A and compared as described above, and if the data is erased for all addresses, CPU 1 turns on the lamp. let

If there is any data that has not been erased during the comparison, the check for sample A is finished, and the same process as described above is performed for the next sample B. This process is repeated until all samples are completely erased.

FIG. 2 is a processing flow diagram of the above-mentioned apparatus. In the figure, in the process of this apparatus, a series of operations starts from start 11, and erasing ends at end 28.

First, address initialization processing 12 is performed, and the sample stand 15
A process 13 of reading out the data of sample A is performed, and a process 1 of determining whether the data is erased or not, that is, whether it is FFH or not.
4 is performed, and if (YES), the data is sent to the next final address judgment process 15; [If NO3, the sample B on the sample stand is sent to the judgment process 18 to see if the erasure is completed or not. , [If YES], it is sent to the address initialization process 12; [If it is NOI, it is sent to the next address initialization process 1.
Sent to 9.

If the final address is [:YES], processing 16 is performed to turn on the erase completion lamp A of sample A, and if [NO3], the process returns to processing 13 via address increment processing 17. After passing through treatment 16, sample B
If the result is NO3, the same processes 19 to 27 as the processes 12 to 18 are performed for sample B. . If the determination process 24 of whether or not the sample A has been erased is NOI, the process returns to the address initialization process 12. If [:YES], the process ends 28.

By incorporating a timer in the embodiment shown in FIG. 1, it is possible to measure the erasing time of the sample, making it even more convenient to evaluate the erasing time.

〔Effect of the invention〕

As explained above, the present invention has the effect of saving time because it is possible to see at a glance which samples have been erased, and there is no need to confirm the erasure with a PROM writer after erasing. Since there is no need to irradiate the sample with ultraviolet rays for an extra period of time, it has the effect of erasing the sample in the shortest possible time.In particular, when a timer is built in, the erasing time can be kept constant without manual intervention.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a UV-PROM erasing device according to an embodiment of the present invention, and FIG. 2 is a processing flow diagram of the UV-PROM erasing device of FIG. 1...CPU, 2...I'tOM, 3
...R.A.M. 4... Ultraviolet irradiation device, 5... Sample stand, 6... Erase completion lamp lighting device, 7...
...Address/data bus, 8...Data latch circuit, 11...Start, 12, 19...
...Address initialization processing, 13-...Processing to read data of sample A, 14, 21...F
Processing to determine whether it is FH or not, 15.22...Processing to determine whether it is the final address, 16.23...Processing to turn on the completion lamp, 17.25... - Address increment processing, 18. 27... Judgment processing whether erasure is complete, 28... End. Agent Patent Attorney Uchihara Oto 1st session? JZIl

Claims (1)

[Claims] A UV-PROM erasing device capable of erasing with ultraviolet rays, characterized in that it is provided with means for detecting completion of erasing.
V-PROM eraser.