ILLEGAL ACCESS PREVENTING METHOD

ILLEGAL ACCESS PREVENTING METHOD

PROBLEM TO BE SOLVED: To provide an illegal access preventing method permitting a simple structure that is easily manufactured at low cost. SOLUTION: In this method, at least one resistance element for irreversibly selecting high impedance state or low impedance state is provided to an interface par...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
1. Verfasser: HIRAI MASAHIKO
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
SEMICONDUCTOR DEVICES
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To provide an illegal access preventing method permitting a simple structure that is easily manufactured at low cost. SOLUTION: In this method, at least one resistance element for irreversibly selecting high impedance state or low impedance state is provided to an interface part or a peripheral circuit part inside an integrated circuit, and when at least one signal different from collation information and a standard previously configured inside the integrated circuit is received, the impedance of the resistance element is changed from the initial state, and access to the integrated circuit is partly or entirely irreversibly stopped. COPYRIGHT: (C)2005,JPO&NCIPI