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:
Apr. 07, 2009
Filed:
Jan. 27, 2003
Dyson Wilkes, Marlborough, GB;
Dyson Wilkes, Marlborough, GB;
Microsoft Corporation, Redmond, WA (US);
Abstract
A processor control system allows stored program code to be replaced. The original code can be stored entirely in a first memory, for example a ROM, with correction instructions stored in a second memory, for example a RAM, and the second memory is accessed only when a correction instruction exits. Received memory addresses are divided into a first plurality of most significant bits, and a second plurality of least significant bits. Only when the second plurality of least significant bits are all equal to zero, and there is a correction instruction stored in the RAM with an address which equals the most significant bits, the correction instruction is read and supplied to the processor. This, employs relatively little additional hardware, and the efficiency of the system is improved.