JPS6446846U - - Google Patents
Info
- Publication number
- JPS6446846U JPS6446846U JP14094287U JP14094287U JPS6446846U JP S6446846 U JPS6446846 U JP S6446846U JP 14094287 U JP14094287 U JP 14094287U JP 14094287 U JP14094287 U JP 14094287U JP S6446846 U JPS6446846 U JP S6446846U
- Authority
- JP
- Japan
- Prior art keywords
- recognition data
- read
- comparison
- memory cell
- storage means
- 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
- 238000013500 data storage Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 1
Landscapes
- Storage Device Security (AREA)
Description
第１図は本考案の認識（ＩＤ）機能付きリード
オンリメモリ（ＲＯＭ）のブロツク図、第２図は
実施例のＲＯＭチツプを示す図、第３図は実施例
のＲＯＭチツプのブロツク構成図、第４図及び第
５図はそれぞれ実施例のＲＯＭチツプを用いたメ
モリの図、第６図は従来のメモリのアドレス空間
を示す図である。
１……ＲＯＭセル、２……ＩＤ記憶手段、３…
…比較手段、４……読出イネーブル手段。
FIG. 1 is a block diagram of a read-only memory (ROM) with an identification (ID) function of the present invention, FIG. 2 is a diagram showing a ROM chip of an embodiment, and FIG. 3 is a block diagram of a ROM chip of an embodiment. 4 and 5 are diagrams of a memory using the ROM chip of the embodiment, respectively, and FIG. 6 is a diagram showing the address space of a conventional memory. 1...ROM cell, 2...ID storage means, 3...
... Comparison means, 4... Read enable means.
Claims (1)
記憶する認識データ記憶手段と、該認識データ記
憶手段に記憶された認識データと所定のアドレス
に対応して供給される認識データとを比較するた
めの比較手段と、該比較手段による比較の結果上
記両識別データが一致したならば、上記リードオ
ンリメモリセルの内容を以降読出し可能とせしめ
る読出イネーブル手段とを具備して成ることを特
徴とする認識機能付きリードオンリメモリ。 A read-only memory cell, a recognition data storage means for storing recognition data in advance, and a comparison means for comparing the recognition data stored in the recognition data storage means with the recognition data supplied corresponding to a predetermined address. and read enable means for making the contents of the read-only memory cell readable from now on if the two identification data match as a result of comparison by the comparison means. Only memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14094287U JPS6446846U (en) | 1987-09-17 | 1987-09-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14094287U JPS6446846U (en) | 1987-09-17 | 1987-09-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6446846U true JPS6446846U (en) | 1989-03-23 |
Family
ID=31405565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14094287U Pending JPS6446846U (en) | 1987-09-17 | 1987-09-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6446846U (en) |
-
1987
- 1987-09-17 JP JP14094287U patent/JPS6446846U/ja active Pending