US 5,635,703 AGranted

Card storage medium having a multi-application support function

AssigneeFujitsu Limited

InventorHiroshi Tanaka

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Abstract

A card storage medium accessible from several applications simultaneously has a storage unit, a communication control unit and a file access control unit. The communication control unit includes a command multiplex reception control unit for accepting a command on occasion received from the outside, while successively requiring the file access control unit to perform a command process according to the command accepted. The file access control unit includes an access exclusive control unit for inhibiting access to a file unit that is an object of a command process required by the command multiplex reception control unit if the file unit is already an object of an access for another command process. The card storage medium of this invention may be adapted to an IC card or an optical card which is necessary to comply with diversification or sophistication of users' demands.

Claims12

Dependent claims

A card storage medium having a storage unit for retaining files therein, a communication control unit for controlling communications with the outside, and a file access control unit for performing a command process according to a command received by said communication control unit by controlling an access to a file in said storage unit comprising:

a command multiplex reception control unit for accepting on occasion a command received from the outside by said communication control unit, besides successively requiring said file access control unit to perform a command process according to the command accepted;
said file access control unit comprising:
an access exclusive control unit for managing the files in said storage unit in predetermined file units, and if a file unit that is an object of a new command process required by said command multiplex reception control unit is already an object of another command process, inhibiting access to said file unit for said new command process.

Dependencies are inferred from the claim text.

Facts

Application: 08/535,954Filed 28 Sep 1995
Priority: JP 7-06091120 Mar 1995
Granted: 3 Jun 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G07F 7/1008
Together with a coded signal , e.g. in the form of personal identification information, like personal identification number [PIN] or biometric…
G06F 9/52
Multiprogramming arrangements: program synchronisation; Mutual exclusion, e.g. by means of semaphores
G06K 19/0723
With integrated circuit chips: the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on…
G06Q 20/341
Using cards, e.g. integrated circuit [IC] cards or magnetic cards: active cards, i.e. cards including their own processing means, e.g. including…