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Techniques for entering a low-power link state

  • US 9,813,998 B2
  • Filed: 03/07/2011
  • Issued: 11/07/2017
  • Est. Priority Date: 06/29/2006
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a physical point-to-point link within an electronic system having a cache-coherent, link-based interconnect fabric;

    a first component within the electronic system coupled with a first end of the point-to-point link, the first component to transmit a request over the point-to-point link to initiate transition of the point-to-point link from an active state to a low power state, the first component to operate as a master device in a power control negotiation, wherein the point-to-point link is to be incapable of transmitting packets during the low power state; and

    a second component within the electronic system coupled with a second end of the point-to-point link, the second component, in response to the request, to selectively allow or disallow the transition of the point-to-point link from the active state to the low power state, wherein the second component sends negative acknowledge (NACK) message to disallow the transition of the point-to-point link from the active state to the low power state, and further wherein the first component maintains the point-to-point link in the active state in response to the NACK message, the second component to operate as a slave device in the power control negotiation, wherein no pending transactions or subsequent transactions are to occur within an upcoming period of time.

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