JPH0313548U - - Google Patents
Info
- Publication number
- JPH0313548U JPH0313548U JP1989072114U JP7211489U JPH0313548U JP H0313548 U JPH0313548 U JP H0313548U JP 1989072114 U JP1989072114 U JP 1989072114U JP 7211489 U JP7211489 U JP 7211489U JP H0313548 U JPH0313548 U JP H0313548U
- Authority
- JP
- Japan
- Prior art keywords
- prom
- comp
- rdregister
- keywordrom
- keywo
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Storage Device Security (AREA)
Description
第１図はその考案の一実施例を示すＥ２ＰＲＯ
Ｍのブロツクダイアグラム、第２図はこの考案の
一実施例による動作を示すフロー、第３図は従来
のＥ２ＰＲＯＭを示すブロツクダイアグラムであ
る。
図において、１……アドレスデコーダ、２……
メモリアレイ、３……バツフア、５……Ｋｅｙｗ
ｏｒｄＲＯＭ、６……ＫｅｙｗｏｒｄＲｅｇｉｓ
ｔｅｒ、７……ＣＯＭＰである。なお、図中、同
一符号は同一、または相当部分を示す。
Figure 1 shows an example of the E 2 PRO device.
FIG. 2 is a flowchart showing the operation of an embodiment of this invention, and FIG. 3 is a block diagram showing a conventional E 2 PROM. In the figure, 1...address decoder, 2...
Memory array, 3...Batsuhua, 5...Keyw
ordROM, 6...KeywordRegis
ter, 7...COMP. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
）において、ＫｅｙｗｏｒｄＲＯＭ，Ｋｅｙｗｏ
ｒｄＲｅｇｉｓｔｅｒこれら二つに記憶、または
書き込まれたキーワードを比較照合するＣＯＭＰ
（比較器）とを備えたことを特徴とするデータ保
護機能付きＥ２ＰＲＯＭ。 E 2 PROM (Electrically rewritable ROM)
), KeywordROM, Keywo
rdRegister COMP to compare and match the keywords stored or written in these two
(Comparator) E 2 PROM with data protection function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989072114U JPH0313548U (en) | 1989-06-20 | 1989-06-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989072114U JPH0313548U (en) | 1989-06-20 | 1989-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0313548U true JPH0313548U (en) | 1991-02-12 |
Family
ID=31609761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989072114U Pending JPH0313548U (en) | 1989-06-20 | 1989-06-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0313548U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5230546A (en) * | 1975-08-29 | 1977-03-08 | Liljendahl S A J | Quick fastening button |
-
1989
- 1989-06-20 JP JP1989072114U patent/JPH0313548U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5230546A (en) * | 1975-08-29 | 1977-03-08 | Liljendahl S A J | Quick fastening button |
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