Patent ID: 6272570
Filing Date: 2001-08-07
Classification: G06Q,G07F

Abstract:
An IC memory card for transmitting and receiving data to and from an external system, comprising:a connector for connecting with said external system;an interface circuit for transmitting and receiving data to and from said external system through said connector using a card address signal, a card data signal and a card control signal;a common memory circuit for transmitting and receiving signals through said interface circuit to store therein preservative data from said external system;an attribute memory region to be accessed by said external system so as to identify a type of the IC memory card;a card attribute memory circuit located at even-numbered addresses of said attribute memory region and storing card attribute information;an even attribute control circuit for generating an even control signal for transmitting and receiving signals to and from said card attribute memory circuit;a special operation circuit for performing an operation different from the operation performed by said common memory circuit;a data storage circuit located at odd-numbered addresses in said attribute memory region and storing data to be transferred to said special operation circuit or data transferred from said special operation circuit;an odd attribute control circuit for generating an odd control signal for controlling said data storage circuit based on the card control signal; anda signal selection circuit for selecting the card control signal outputted from said external system, a common address signal and a common data signal inputted and outputted through said interface circuit to access said data storage circuit in response to said odd control signal, and for selecting a special operation control signal outputted from said special operation circuit, a special operation address signal and a special operation data signal to access said data storage circuit in response to a special operation select signal outputted from said special operation circuit.