JPS6421952A - Read-only memory code number verification circuit - Google Patents
Read-only memory code number verification circuitInfo
- Publication number
- JPS6421952A JPS6421952A JP17826787A JP17826787A JPS6421952A JP S6421952 A JPS6421952 A JP S6421952A JP 17826787 A JP17826787 A JP 17826787A JP 17826787 A JP17826787 A JP 17826787A JP S6421952 A JPS6421952 A JP S6421952A
- Authority
- JP
- Japan
- Prior art keywords
- read
- code number
- memory
- stored
- rom
- 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
Landscapes
- Read Only Memory (AREA)
- Semiconductor Memories (AREA)
- For Increasing The Reliability Of Semiconductor Memories (AREA)
- Dram (AREA)
Abstract
PURPOSE:To make it possible to easily verify a ROM code number from outside even on the manufactured article on which resin has been sealed by a method wherein the first read-only memory, in which data and a program are stored, and the second read-only memory in which the code number of the first read- only memory is stored are provided. CONSTITUTION:The first read-only memory, in which data and a program are stored, and the second read-only memory, in which the code number of the first read-only memory is stored, are provided on an integrated circuit containing a read-only memory. When the above mentioned second read-only memory is accessed from the exterior, said code number is made possible to be verified by reading out the code number to the exterior. For example, a region 0 in which the ROM code number is stored, is provided inside the ROM 4, a specific address of the ROM is assigned, and a program and data are stored in the remaining region 10 by the user. As a result, the ROM code number can be easily verified from outside the integrated circuit without conducting probing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17826787A JPS6421952A (en) | 1987-07-16 | 1987-07-16 | Read-only memory code number verification circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17826787A JPS6421952A (en) | 1987-07-16 | 1987-07-16 | Read-only memory code number verification circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6421952A true JPS6421952A (en) | 1989-01-25 |
Family
ID=16045496
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17826787A Pending JPS6421952A (en) | 1987-07-16 | 1987-07-16 | Read-only memory code number verification circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6421952A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5611979A (en) * | 1993-05-11 | 1997-03-18 | Tokyo Gas Co., Ltd. | Fabrication method for a funnel liner |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6188359A (en) * | 1984-10-08 | 1986-05-06 | Nec Corp | One-chip microcomputer |
JPS61105798A (en) * | 1984-10-29 | 1986-05-23 | Nec Corp | P rom ic |
-
1987
- 1987-07-16 JP JP17826787A patent/JPS6421952A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6188359A (en) * | 1984-10-08 | 1986-05-06 | Nec Corp | One-chip microcomputer |
JPS61105798A (en) * | 1984-10-29 | 1986-05-23 | Nec Corp | P rom ic |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5611979A (en) * | 1993-05-11 | 1997-03-18 | Tokyo Gas Co., Ltd. | Fabrication method for a funnel liner |
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