Direct memory access controller with full read/write capability

  • US 5,896,550 A
  • Filed: 04/03/1997
  • Issued: 04/20/1999
  • Est. Priority Date: 04/03/1997
  • Status: Expired due to Term
First Claim
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1. A method for increasing versatility of access to a register set within a direct memory access (DMA) controller, the DMA controller controlling direct memory access transfers to and from a main memory, the method comprising the following steps:

  • (a) when a first control field in a configuration register has a first value, providing normal operating access to a register set within the DMA controller, wherein the normal operating access includes the register set providing control and status of the direct memory access transfers to and from the main memory, the normal operating access not allowing storage and restoration of a state of a DMA transfer; and

    ,(b) when the first control field in the configuration register has a second value, providing special access to the register set, the special access allowing storage and restoration of a state of a DMA transfer.

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