IC memory card having direct and indirect access card interface

Details IC memory card having direct and indirect access card interface IC memory card having direct and indirect access card interface

1991-06-14

1993-11-09

Pitts, Harold

Registers

Records

Conductive

235487, G06K 1906

Patent

active

052605558

ABSTRACT:
Interface signal lines with an external apparatus include an address signal, a data signal, a direct access read signal, a direct access write signal, an indirect access read signal, and an indirect access write signal. An IC memory card includes an address register for indirectly accessing a semiconductor memory. A first memory access means accesses an address indicated by the address signal using the direct access read and write signals. A second memory access means accesses an address of the semiconductor memory indicated by the address register using the indirect access read and write signals.

REFERENCES:
patent: 5097118 (1992-03-01), Iijima
Japan Electronic Industry Development Association Personal Computer Working Committee: IC Memory Card Guide Line, Ver. 3, pp. 1, 4 to 22, 34 and 35 (May/1989) (Ver. 1, Sep./1989).

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