Method and apparatus for banking addresses for DRAMS

Details Method and apparatus for banking addresses for DRAMS Method and apparatus for banking addresses for DRAMS

1997-03-07

1999-06-01

Swann, Tod R.

Electrical computers and digital processing systems: memory

Address formation

Address multiplexing or address bus manipulation

711167, 711106, G06F 1200

Patent

active

059097035

ABSTRACT:
A first plurality of address bits is provided to an address bus during a first time period. At least one banking address bit or at least one non banking address bit is selected according to a banking control signal, the selected bit being part a second plurality of address bits. The second plurality of address bits is multiplexed onto the address bus during a second time period. A first selector circuit receives a first and second group of address bits for a memory and outputs the first and second group during a first and second time period, respectively, according to a first select signal. A second selector circuit provides a subset of the second group to the first selector circuit, the second selector circuit selects a banking address group or a non banking address group as the subset according to a memory banking enable signal.

REFERENCES:
patent: 5265231 (1993-11-01), Nuwayser
patent: 5535169 (1996-07-01), Endo et al.
patent: 5623638 (1997-04-01), Audrade
Advanced Micro Devices, Inc., "Breaking Through the 1 MByte Address Barrier Using the Am186ES Microcontroller", Feb. 6, 1996-Mar. 7, 1996.
Advanced Micro Devices, "Am 186.TM.EM and AM188.TM.EM User's Manual with Am186 Instruction Definitions", 1995, pp. 1-1 thru 1-6; 2-1 thru 2-9; 3-1 thru 3-18; 4-1 thru 4-9; 5-1 thru 5-12; 6-1 thru 6-2; 7-1 thru 7-35; and 12-1 thru 12-6.
Advanced Micro Devices, "Am186.TM.EM and Am188.TM.EM High -Performance, 80C186-and 80C188-Compatible, 16-Bit Embedded Microcontrollers", 1996, pp. 1-98.
Advanced Micro Devices, "Am186.TM.ES and Am188.TM.ES High-Performance, 80C186-and 80C188-Compatible, 16-Bit Embedded Microcontrollers", 1996, pp. 1-124.

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