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. 05, 1994
Filed:
May. 22, 1991
Kevin W Leary, Walpole, MA (US);
James D Donahue, Waltham, MA (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
The effective capacity of an instruction cache in a digital signal processor with a modified HARVARD architecture is enhanced by decoding a current instruction to be executed to determine whether it is a program memory data access (PMDA) instruction that requires a data transfer from the program memory when the next instruction is fetched from the program memory. If it is a PMDA instruction, the next instruction is loaded into a cache, which then provides the stored instruction each time the PMDA instruction reappears. This relieves a bottleneck resulting from a simultaneous call for both the next instruction, and datum for the current instruction, from the program memory. The cache is used only for an instruction following a PMDA instruction, and can thus have a substantially smaller capacity than previously.