Microcircuit for a chip card comprising a protected programmable

Details Microcircuit for a chip card comprising a protected programmable Microcircuit for a chip card comprising a protected programmable

1992-09-16

1995-09-19

Gossage, Glenn

Registers

Coded record sensors

Particular sensor structure

235382, 364DIG1, 3642466, 3642467, 3642468, 364DIG2, 3649691, 3649692, 3649694, 364969, 395650, 395700, 395490, 39549701, 395485, G06F 1214, G06F 1216

Patent

active

054524318

ABSTRACT:
A microcircuit for a multi-application chip card, comprising notably a read-only memory (12), a programmable memory (13), and an addressing control circuit (14) for the programmable memory. The programmable memory (13) is subdivided into at least a repertory region (ZR) and an application region (ZA), the repertory region (ZR) comprising, for each application loaded therein, at least a reference code of an application i present in the region ZA.sub.i as well as the addressed ZA.sub.il and ZA.sub.ih, respectively, of the beginning and the end of the region ZA.sub.i allocated to the relevant application. The microcircuit also comprises apparatus (25 to 50) for inhibiting any command (R, W or E) for the programmable memory (13) when it relates to an address outside the interval ZA.sub.il -ZA.sub.ih of the application being processed, except when it concerns a specific priority operation provided by a program permanently stored in the read-only memory (12).

REFERENCES:
patent: 3573855 (1971-04-01), Cragon et al.
patent: 3742458 (1973-06-01), Inoue et al.
patent: 3971916 (1976-07-01), Moreno
patent: 5003594 (1991-03-01), Shinagawa
patent: 5161256 (1992-11-01), Iijima
patent: 5276903 (1994-01-01), Shinagawa
patent: 5285200 (1994-02-01), Kuriyama
patent: 5325496 (1994-06-01), Hays et al.

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