Static information storage and retrieval – Addressing – Plural blocks or banks
Patent
1995-08-31
1996-10-29
Nelms, David C.
Static information storage and retrieval
Addressing
Plural blocks or banks
365190, 365196, G11C 800
Patent
active
055703194
ABSTRACT:
An improved approach for breaking the bit lines of a semiconductor memory device into small pieces, referred to herein as Embedded Access Trees (EATs), is introduced. Embedded Access Trees enjoy the principal advantage of the banked approach by dividing long bit lines into several smaller bit lines to decrease the effective load which a selected cell must drive. However, EATs avoid most of the limitations of the banked approach, e.g., increased size, power and complexity. In a preferred embodiment of the invention, EATs are embedded into the existing full array and do not require additional peripheral decoders, MUXes or complex and costly global routing. For a given processing technology, the present invention permits a full memory array to be subdivided into more subarrays than the banked approach, with corresponding performance improvements.
REFERENCES:
patent: 5132930 (1992-07-01), Furutani et al.
patent: 5295111 (1994-03-01), Tsujimoto
"Session XVII: Megabit Drams" by Ron Raylor and Mark Johnson of Mostek Corp., 1985 IEEE Int'l. Solid-State Circuits Conf., pp. 242-243.
"Circuit Techniques for Large CSEA SRAM's" by D. Wingard et al., IEEE Journal of Solid-State Circuits, vol. 27, No. 6, Jun. 1992, pp. 908-918.
"A 1.5-ns Access Time, 78-um.sup.2 Memory-Cell Size, 64-kb ECL-CMOS SRAM" by K. Yamaguchi et al., IEEE J. of Solid-State Circuits, vol. 27, No. 2, Feb. 1992, pp. 167-173.
Bewick Gary W.
Santoro Mark R.
Tavrow Lee S.
McKay Philip J.
Nelms David C.
Niranjan F.
Sun Microsystems Inc.
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