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Subsystem boot and peripheral data transfer architecture for a subsystem of a system-on- chip

  • US 20040186930A1
  • Filed: 08/28/2003
  • Published: 09/23/2004
  • Est. Priority Date: 02/28/2001
  • Status: Active Grant
First Claim
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1. In a subsystem of a system, a method comprising:

  • a Direct Memory Access (DMA) device of the subsystem detecting a subsystem reset state;

    in response, the DMA device awaits notification by a data transfer unit of the subsystem, of receipt of a data packet addressed to the DMA device;

    retrieving from said data transfer unit said received data packet, by said DMA device, and extracting from said retrieved data packet, location information identifying storage locations external to said subsystem where boot code of said subsystem are stored;

    accessing said external storage locations through said data transfer unit, by said DMA device, and transferring said boot code into a memory unit of said subsystem; and

    interrupting a processor of said subsystem by said DMA device to transfer control to said processor to execute said boot code to start up said subsystem.

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