DYNAMICALLY MODULATING LINK WIDTH
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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Abstract
Systems and methods of managing a link provide for receiving a remote width capability during a link initialization, the remote width capability corresponding to a remote port. A link between a local port and the remote port is operated at a plurality of link widths in accordance with the remote width capability.
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Citations
20 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- 9. The apparatus of clam 1, wherein the predetermined amount of time includes a first period corresponding to an amount of time for a link layer of the remote port to relay the second link width to a physical layer of the remote port.
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11. A method comprising:
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receiving from a remote port a remote width capability of the remote port during a link initialization, the remote width capability including a plurality of supported link widths; comparing the remote width capability to a local width capability of a local port; selecting a common link map that the remote port and the local port can support; operating a link between the local port and the remote port at a plurality of link widths in accordance with the remote width capability without an additional link initialization or negotiation between the local port and the remote port, including establishing a first link width for the link based on the remote width capability and the local width capability, selecting a second link width to be narrower than the first link width based on the remote width capability and a power saving condition of the local port, and modulating the link to the second link width and placing a portion of the local port in a low power state after modulating the link to the second link width, and based on an increased bandwidth requirement, selecting a third link width be wider than the first link width, and bringing a portion of the local port out of the low power state and modulating the link to the third link width; and transmitting 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 the remote port has been notified of the second link width. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A system comprising:
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a remote port; a link coupled to the remote port; and a local port coupled to the link, the local port including control logic to receive from the remote port training data of a training sequence including a remote width capability of the remote port during a link initialization, compare the remote width capability to a local width capability of the local port, and select a common link map that the remote port and the local port can support and operate the link at a plurality of link widths based on the common link map, wherein the control logic is to establish a first link width for the link and select a second link width responsive to an operating condition change of the local port, modulate the link to the second link width, thereafter detect an empty transaction queue of the local port associated with an active part of the link, and based on the determination of the empty transaction queue, place an active link portion of the local port in an intermediate power state, wherein a reactivation latency time of the intermediate power state is smaller than a reactivation latency time of a low power state, wherein the control logic is further to transmit data to the remote port at the second link width after a predetermined amount of time has elapsed after the remote port has been notified of the second link width. - View Dependent Claims (19, 20)
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Specification