Method and apparatus for emulating a high capacity DRAM

Details Method and apparatus for emulating a high capacity DRAM Method and apparatus for emulating a high capacity DRAM

1995-11-16

1996-12-31

Nelms, David C.

Static information storage and retrieval

Systems using particular element

Capacitors

36523001, 36523006, G11C 1124

Patent

active

055900712

ABSTRACT:
A method and apparatus for emulating a high storage capacity DRAM component. The emulation involves the use of a component containing multiple DRAMs, each having a lower storage capacity than that of the emulated DRAM, but having a cumulative storage capacity greater than or equal to that of the DRAM being emulated. Emulation entails the decoding of extra bits in an address signal from a controller for the high capacity DRAM to direct the output of DRAM control signals from a decoder to the multiple DRAM component so as to activate only one of the plurality of lower density DRAMs therein. Advantageously, the invention may be implemented so as to permit migration to a next generation DRAM device without altering wiring on the printed circuit board or changing the memory controller used to access the DRAM component.

REFERENCES:
patent: 4999815 (1991-03-01), Barth, Jr. et al.
patent: 5164916 (1992-11-01), Wu et al.
patent: 5228132 (1993-07-01), Neal et al.
patent: 5307320 (1994-04-01), Farrer et al.
patent: 5371866 (1994-12-01), Cady
IBM Technical Disclosure Bulletin, vol. 30, No. 11, pp. 363-365, Apr. 1988.
IBM Engineering Specification, Spec #43G9062, "4M.times.4 Stacked DRAM".
"Integrated Multichip Memory Module, Structure and Fabrication", IBM Docket No. BU9-93-027.

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