Data storage device and method of accessing the data storage dev

Details Data storage device and method of accessing the data storage dev Data storage device and method of accessing the data storage dev

1993-07-07

1994-12-06

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 3, 380 23, 380 24, 380 25, 380 49, 380 50, 235379, 235380, 34082531, 34082534, 36518907, H04L 900

Patent

active

053717937

ABSTRACT:
A semiconductor data storage device has a common memory for storing processed data, an attribute memory for storing attribute data, a buffer circuit connected to a bus of the common memory and a bus of the attribute memory, and a control circuit connected to the bus of the common memory and the bus of the attribute memory for accessing each of the common memory and the attribute memory. The control circuit controls connection and isolation of the buffer circuit. According to a method of accessing the semiconductor data storage device, when a secret code is input from the terminal unit through the buffer circuit, the control circuit isolates the buffer circuit, thereafter compares the secret code with an identification code stored in the attribute memory, and sets the buffer circuit in the connected state to allow the terminal unit to access the common memory if the secret code and the identification code coincide with each other and maintains the buffer circuit in the isolated state to inhibit the terminal unit from accessing the common memory if the secret code and the identification code do not coincide with each other.

REFERENCES:
patent: 4007355 (1977-02-01), Moreno
patent: 4903299 (1990-02-01), Lee et al.
patent: 5216633 (1993-06-01), Weon et al.
patent: 5237609 (1993-08-01), Kimura

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