Via Technologies, Inc.

Jin-Liang Mao

Wen-Yu Tseng

A peripheral component interconnect express (PCIE) data transmission system and link state managing method thereof are disclosed. The PCIE data transmission system includes an upstream device, a downstream device and a link. When the link is in a first link state, the downstream device and the upstream device transmit data normally via the link. When the upstream device outputs a turn-off signal to the downstream device, a time period is counted. The downstream device outputs an acknowledging signal to response the turn-off signal. If the upstream device does not receive the acknowledging signal within the time period, the link is transited from the first link state to second link state to remove the power of the link.

Data transmission system and link state managing method thereof using turn-off acknowledgement and electrical idle waiting timeouts

In a state negotiation method of a PCI-E upstream device supporting multiple downstream configurations, a state of a second link asserted by a second state machine of the PCI-E upstream device is detected when a first link asserted by a first state machine of the PCI-E upstream device is ready to change from a first state to a second state in a specified duration. A negotiating procedure is performed to have the first link and the second link enter the second state simultaneously if the second link is detected to be in the first state within the specified duration.

State negotiation method in PCI-E architecture

A method for link bandwidth management between two devices in communication through a bandwidth-adjustable bus in a computer system determines which of a speed negotiation priority and a width negotiation priority is higher when the change condition is activated. An original width of the bus is changed to a target width first while remaining an original speed of the bus unchanged when the width negotiation priority is higher, and then optionally changing the original speed to a target speed. On the other hand, an original speed of the bus is changed to the target speed first while remaining the original width of the bus unchanged when the speed negotiation priority is higher, and then optionally changing the original width to the target width. The bus operates at a target bandwidth with the target width and the target speed without disabling the link state or powering down the computer system.

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Fremont, CA, United States of America

Jin-Liang Mao