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Direct memory access system and method using the same

  • US 9,021,153 B2
  • Filed: 05/22/2013
  • Issued: 04/28/2015
  • Est. Priority Date: 02/20/2008
  • Status: Active Grant
First Claim
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1. A direct memory access (DMA) system for directly accessing a memory and coupled to an interface for transmitting packets between a host terminal and a client terminal, wherein the host terminal comprises the memory storing a TX packet and a corresponding TX descriptor including a TX information, the DMA system comprising:

  • a DMA transmitter for transmitting the TX information and the TX packet to the interface according to the TX descriptor, and appending the TX information to the head of the TX Packet based on the TX descriptor, wherein the TX information is predetermined to be used for the host terminal communicating with the client terminal by the interface, and the TX information does not contain data which the DMA transmitter having to use;

    a DMA receiver for receiving an RX packet and an RX information from the interface according to a RX descriptor, wherein the RX information is predetermined to be used for the client terminal communicating with the host terminal by the interface, and the RX information does not contain data which the DMA receiver having to use;

    wherein the TX descriptor comprises at least one pointer, at least one length of the TX packet, and the TX information;

    wherein the RX descriptor comprises at least one pointer, at least one length of RX packet, and the RX information; and

    wherein the DMA transmitter selectively appends a TX message between the TX packet and the TX information, and the DMA receiver selectively appends an RX message between the RX packet and the RX information, wherein the TX message and the RX message are predetermined to be used for communication between the host terminal and the client terminal.

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