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:
Sep. 01, 1998
Filed:
Feb. 28, 1996
Wendy Reed, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A data processing system (10) including a chip select circuit (40) which allows flexible attribute protection, and a method for providing a plurality of chip select signals in the data processing system are disclosed. Each of two or more decoders (42, 48) determines whether a bus cycle address is within a programmable region and matches one or more programmable attributes, and if so activates a corresponding match signal. A logical operation circuit (60) then selectively causes a chip select signal (72) to be activated in response to a logical operation performed on the match signals. In one embodiment, the logical operation circuit (60) may cause the chip select signal (72) to be activated if either of two match signals (47, 53) is activated, allowing for example the same region of memory to be accessed from two address spaces using the same chip select signal (72).