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DYNAMICALLY MODULATING LINK WIDTH

  • US 20150081921A1
  • Filed: 11/26/2014
  • Published: 03/19/2015
  • Est. Priority Date: 05/21/2004
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a hardware local port having control logic to receive from a remote port a remote width capability during a link initialization, the remote width capability of the remote port and including a plurality of supported link widths, compare the remote width capability to a local width capability of the local port, select a common link map that the remote port and the local port can support, and operate a link between the local port and the remote port at a plurality of link widths in accordance with the remote width capability, wherein the control logic is to establish a first link width for the link based on the remote width capability and the local width capability, select a second link width narrower than the first link width based on the remote width capability and a power saving condition of the local port and modulate the link to the second link width, place a portion of the local port in a low power state after the link modulation to the second link width, and transmit data to the remote port at the second link width after the modulation of the link to the second link width if a predetermined amount of time has elapsed after notification of second link width to the remote port.

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