IC card with memory area protection based on address line restri

Details IC card with memory area protection based on address line restri IC card with memory area protection based on address line restri

1989-08-25

1993-04-27

Dixon, Joseph L.

Registers

Coded record sensors

Particular sensor structure

395425, 235380, 235382, 365195, 365228, G06F 1214, G06F 1216, G06K 500, G11C 700

Patent

active

052069389

ABSTRACT:
An IC card including application programs and a test program for a product test wherein in order to protect a predetermined region on a memory map, during an execution of the application programs, including a portion in which a pass code for providing security regarding accessing the test program is stored against an assignment, an address restriction circuit disposed on an address bus acting to restrict the value of predetermined digit of the address to thus restrict the regions capable of being accessed.

REFERENCES:
patent: 4569048 (1986-02-01), Sargent
patent: 4875156 (1989-10-01), Tanagawa et al.
patent: 4930129 (1990-05-01), Takahira
patent: 5016212 (1991-05-01), Yamaguchi et al.
patent: 5019970 (1991-05-01), Yamaguchi et al.
patent: 5067077 (1991-11-01), Wakimoto et al.
Nikkei Electronics, No. 404, Sep. 22, 1986, pp. 133-144.

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