Memory capacity detecting device for memory cards

Details Memory capacity detecting device for memory cards Memory capacity detecting device for memory cards

1987-12-02

1991-01-01

Moffitt, James W.

Static information storage and retrieval

Read/write circuit

365201, 36523003, 400692, G11C 700

Patent

active

049823787

ABSTRACT:
A memory capacity detecting device for memory cards including at least one memory chip of a predetermined memory capacity comprises an address specifying section for generating an address signal which selectively specifies two memory chips, a data write-in section for writing two items of preset data into top memory locations of the specified memory chips, and chip number detecting section for detecting the number of memory chips in the memory card by first reading out the data from the top memory location of each specified memory chip, comparing the readout data with the corresponding preset data, and determining the number of memory chips based on the comparision results. Particularly, the data write-in section includes writing section for writing different two items of the preset data into the top memory locations, and the chip number detecting section includes reading section for reading out the data from the top memory location of each specified memory chip after all the preset data items have been written.

REFERENCES:
patent: 4545010 (1985-10-01), Sacas et al.
patent: 4592011 (1986-05-01), Mantellina et al.
patent: 4653945 (1987-03-01), Sato et al.
patent: 4684275 (1987-08-01), Matsushita et al.
Availability of Additional Storage Capacity, K. Fritsch, et al. IBM Technical Disclosure Bulletin, vol. 15, No. 12, May 1973, p. 3796.

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