Computer memory apparatus

Details Computer memory apparatus Computer memory apparatus

1985-10-30

1988-04-19

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 1200

Patent

active

047394730

ABSTRACT:
A memory subsystem couples to a bus in common with a central processing unit and processes memory requests received therefrom. The subsystem includes a number of addressable memory module units or stacks each having a number of word blocks of dynamic random access memory (DRAM) chips arranged in one of two subsystem configurations and mounted on a single circuit board which connects to the remainder of the subsystem through a single word wide interface. The configurations correspond to a common stack arrangement which provides double the normal amount of density and an adjacent stack arrangement of normal density. As a function of an input density signal, chip select circuits preselect a pair of blocks of RAM chips from a common stack or pair of adjacent stacks. Timing circuits generate a plurality of sequential column address pulses which are selectively applied to the preselected blocks of chips within an interval defined by a row address pulse. This results in the read out of a pair of words from the preselected blocks of a single stack or adjacent stacks in tandem into a pair of subsystem data registers. For each memory read request, the words from each preselected pair of blocks are read out into the data registers in the same sequence providing a double fetch capability without any loss in system performance.

REFERENCES:
patent: 4174537 (1979-11-01), Chu et al.
patent: 4323965 (1982-04-01), Johnson et al.
patent: 4563736 (1986-01-01), Boudreau et al.
patent: 4628489 (1986-12-01), Ong et al.

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