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Methods and apparatus for signaling on a differential link

  • US 9,503,289 B2
  • Filed: 12/08/2014
  • Issued: 11/22/2016
  • Est. Priority Date: 03/14/2002
  • Status: Active Grant
First Claim
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1. A processor device comprising:

  • an interface to couple the processor device to another device, wherein the interface comprises interface logic, implemented at least in part in hardware, to;

    send a first differential, in-band signal to the other device over a differential, point-to-point serial data link;

    enter a low power state in association with the sending of the first in-band signal, wherein the low power state comprises a non-zero power state;

    send a second differential, in-band signal to the other device over the differential, point-to-point serial data link for at least a predetermined length of time to initiate a transition from the low power state to a data transmitting state;

    enter the data transmitting state in association with the sending of the second in-band signal; and

    transmit data to the other device within the data transmitting state.

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