Patents Examined by Rijue R. Mai
  • Patent number: 6418489
    Abstract: Direct memory access controller (DMA) (2) 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) (6). A master DMA engine (MDE) (6) includes a top level state machine (52) to coordinate a context save state machine (54), a parse state machine (56), and a running state machine (58). An loop control descriptor (LCD) queue (74) 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.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: July 9, 2002
    Assignee: Motorola, Inc.
    Inventors: Kristen L. Mason, Gary R. Morrison, Jeffrey M. Polega, Donald L. Tietjen, Frank C. Galloway, Charles Edward Nuckolls, Jennifer L. McKeown, Robert Bradford Cohen