Use of a stored signal to switch between memory banks

Details Use of a stored signal to switch between memory banks Use of a stored signal to switch between memory banks

1995-12-19

1999-06-22

An, Meng-Ai T.

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

710126, 36523006, 36523008, 711 5, 711212, G06F 1206, G06F 1300

Patent

active

059139242

ABSTRACT:
A computer system includes a number of storage elements encoded with space selection instructions and at least one current-space storage element that together allow a computer to address a larger number of devices than allowed by a limited number of address terminals on the computer. Specifically, the current-space storage element is encoded with a space-selection signal that indicates a "current" address space, i.e. which one of a number of mutually exclusive address spaces is currently accessed. The space-selection signal can be changed by any device using a data bus to store signals indicative of a new address space as the "current" address space in the current-space storage element. The current-space storage element is included in a first device that can be accessed by the computer at any time by driving a signal active on a high address line of an address bus. When the signal on the high address line is inactive, the computer accesses one of a number of second devices that are located in mutually exclusive address spaces, as indicated by the current-space storage element's signal.

REFERENCES:
patent: 4713759 (1987-12-01), Yamagishi et al.
patent: 4961172 (1990-10-01), Shubat et al.
patent: 4987537 (1991-01-01), Kawata

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