High memory capacity DRAM SIMM

Details High memory capacity DRAM SIMM High memory capacity DRAM SIMM

1993-04-21

1993-12-21

Popek, Joseph A.

Static information storage and retrieval

Hardware for storage elements

365 63, 36523003, 361760, G11C 504

Patent

active

052726649

ABSTRACT:
A dynamic random access memory (DRAM) single in-line memory module (SIMM) having optimized physical dimensions achieves high speed and high storage capacity. The DRAM SIMM has a printed circuit board with a multi-contact connector, a plurality of DRAM sets, each set having a plurality of DRAM chips mounted on the printed circuit board, and a plurality of buffers which are also mounted on the printed circuit board. The number of buffers is equal to the number of DRAM sets. Various standard DRAM chips can be used on the SIMM to achieve different performance and storage capacity, while maintaining plug compatibility of the multi-contact connector with a memory board. The buffers buffer the control and address signals for the DRAM chips, which is necessary to keep control and address signal integrity due to the number of DRAMS. The buffers permit each DRAM to receive the necessary control and address signals in a more synchronized fashion, so that relative delays are well controlled. The multi-contact connector has a first group of pins for receiving control and address signals, a second group of pins for data input/output signals, a third group of pins for indicating the type code of the SIMM, and a fourth group of pins for power and ground connections.

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Parity Systems Inc. 200-pin SPARC 10 Series SIMM Printed Circuit Board, Feb. 1993.
Silicon Graphics Enhancements Products catalog (Kingston Technology Corp., 17600 Newhope Street, Fountain Valley, CA 92708; Mar. 1993).
Sun Memory catalog (Kingston Technology Corp., 17600 Newhope Street, Fountain Valley, CA 92708; Apr. 1993).

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