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:
Jul. 09, 2002
Filed:
Jan. 18, 2000
Kristen L. Mason, Austin, TX (US);
Gary R. Morrison, Austin, TX (US);
Jeffrey M. Polega, Austin, TX (US);
Donald L. Tietjen, Austin, TX (US);
Frank C. Galloway, Dripping Springs, TX (US);
Charles Edward Nuckolls, Austin, TX (US);
Jennifer L. McKeown, Austin, TX (US);
Robert Bradford Cohen, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
Direct memory access controller (DMA) ( ) adapted to directly execute C language style FOR tasks, where the FOR task includes a movement of a data element from a first location to a second location in memory, and the movement is controlled by a master DMA engine (MDE) ( ). A master DMA engine (MDE) ( ) includes a top level state machine ( ) to coordinate a context save state machine ( ), a parse state machine ( ), and a running state machine ( ). An loop control descriptor (LCD) queue ( ) and a data routing descriptor (DRD) cache store information. The LCD queue allows pipelining of descriptor parsing, while the DRD cache avoids refetching of DRDs on reentry of loops.