JPS6431239A - Semiconductor integrated circuit device - Google Patents

Semiconductor integrated circuit device

Info

Publication number
JPS6431239A
JPS6431239A JP62189109A JP18910987A JPS6431239A JP S6431239 A JPS6431239 A JP S6431239A JP 62189109 A JP62189109 A JP 62189109A JP 18910987 A JP18910987 A JP 18910987A JP S6431239 A JPS6431239 A JP S6431239A
Authority
JP
Japan
Prior art keywords
inputted
high voltage
pin
passed
signal
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
JP62189109A
Other languages
Japanese (ja)
Inventor
Kayoko Katayama
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 JP62189109A priority Critical patent/JPS6431239A/en
Publication of JPS6431239A publication Critical patent/JPS6431239A/en
Pending legal-status Critical Current

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  • Storage Device Security (AREA)

Abstract

PURPOSE:To increase general usefulness, to hold a secret and to limit a user by allowing a memory area to be programmable and equipping a code collating part to collate the contents. CONSTITUTION:When a high voltage is inputted to an address A9 pin 1, a high voltage detecting circuit 9 detects this, the nine bits of addresses A0-A8 are passed through by a signal passing control circuit 11 and a special area 16 is selected. A high voltage detecting signal from the high voltage detecting circuit 9 controls the signal passing control circuit 11 and the output data of the special area 16 are passed through and collated with a signal inputted from a comparing value input pin 5 in a code collating part 7. When the coincidence between the contents of the special area 16 and an inputted code is obtained, the passing of the output data is made possible. When a normal voltage is inputted to the A9 pin 1, the ten bits of the addresses A0-A8 and A9 are passed through in a signal passing control circuit 10, an information storing area (ROM) 17 is selected and the output of this ROM 17 sends the output data from a data output pin 4. Thus, confidentiality is guarantee.
JP62189109A 1987-07-28 1987-07-28 Semiconductor integrated circuit device Pending JPS6431239A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62189109A JPS6431239A (en) 1987-07-28 1987-07-28 Semiconductor integrated circuit device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62189109A JPS6431239A (en) 1987-07-28 1987-07-28 Semiconductor integrated circuit device

Publications (1)

Publication Number Publication Date
JPS6431239A true JPS6431239A (en) 1989-02-01

Family

ID=16235521

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62189109A Pending JPS6431239A (en) 1987-07-28 1987-07-28 Semiconductor integrated circuit device

Country Status (1)

Country Link
JP (1) JPS6431239A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8918642B2 (en) 2009-06-10 2014-12-23 Cisco Technology Inc. Protection of secret value using hardware instability

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8918642B2 (en) 2009-06-10 2014-12-23 Cisco Technology Inc. Protection of secret value using hardware instability

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