Patents by Inventor Yung-Cha Dung

Yung-Cha Dung has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5619727
    Abstract: An apparatus for multiple channel direct memory access using a virtual array technique comprises n DMA blocks connected in series, each DMA having m independent channels for transferring data. Parameters to control a DMA transfer, such as a source address, destination address, length, and an action mode value, are stored in a memory for each one of the m DMA channels. The first dimension DMA is coupled to the memory to retrieve the parameters and is set in a series mode, while a downstream DMA is set in a normal mode. Operation of the apparatus is begun by starting the first dimension DMA, which then acquires control of the system bus. The first dimension DMA then reads and transfers the DMA parameters to the higher dimension, downstream, DMAs, which preempt control of the system bus away from the first dimension DMA through a multi-layer bus arbiter until the higher dimension DMA transfer is complete. Control of the system bus is then restored to the first dimension DMA.
    Type: Grant
    Filed: March 8, 1995
    Date of Patent: April 8, 1997
    Assignee: United Microelectronics Corp.
    Inventors: Chang-Shan Chen, Yung-Cha Dung