JPS6421952A - Read-only memory code number verification circuit - Google Patents

Read-only memory code number verification circuit

Info

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
Application number
JP17826787A
Other languages
Japanese (ja)
Inventor
Hirohisa Imamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP17826787A priority Critical patent/JPS6421952A/en
Publication of JPS6421952A publication Critical patent/JPS6421952A/en
Pending legal-status Critical Current

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.
JP17826787A 1987-07-16 1987-07-16 Read-only memory code number verification circuit Pending JPS6421952A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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