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Method and apparatus for response modes in a pipelined environment

  • US 20020184421A1
  • Filed: 06/01/2001
  • Published: 12/05/2002
  • Est. Priority Date: 06/01/2001
  • Status: Active Grant
First Claim
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1. A pipelined network comprising:

  • at least one initiator device configured to issue requests;

    at least one target device coupled to receive requests from at least one initiator device;

    a target device configured to receive the request; and

    bus signal lines comprising lines to issue requests and responses to requests between initiator devices and target devices and a response flag coupled between at least one target device and at least one initiator device;

    said target device comprising logic to respond to the request comprising;

    a first mode wherein a no-response-available NRA response is selectively issued if there is no space available in the target device to service the request and a response flag is set to a first state when space is available in the target device to service the request;

    a second mode wherein the NRA response is selectively issued if there is no space available in the target device to service the request or the target device is busy and the response flag is set to the first state if space is available in the target device to service the request and the target device is not busy;

    a third mode wherein the response flag is set to the first state and the NRA response is selectively issued; and

    control logic to select the mode to utilize an NRA response and response flag with respect to an initiator device when a target device is unavailable to service the initiator device request.

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