The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 1999
Filed:
Dec. 19, 1995
Jianyun Zhou, San Jose, CA (US);
Surendra Anubolu, San Jose, CA (US);
Adaptec, Inc., Milpitas, CA (US);
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.