Spread spectrum clock negotiation method, and peripheral component interconnect express device and system

A peripheral component interconnect express (PCIe) device, comprising:

• a receiver, configured to receive, from a second PCIe device, first indication information indicating whether the second PCIe device has a spread spectrum clock capability;
• and
• a processor, configured to determine, based on the first indication information, whether to perform spread spectrum clock on a reference clock of the PCIe device,
• wherein when receiving, from the second PCIe device, the first indication information, the receiver is configured to:
• receive, from the second PCIe device, a first skip (SKP) ordered set carrying the first indication information;
• and
• the processor is further configured to:
• parse the first SKP ordered set to obtain the first indication information.

A non-transitory machine-readable medium having instructions stored therein, which when executed by a processor, cause the processor to:

• receive, from a second peripheral component interconnect express (PCIe) device, first indication information indicating whether the second PCIe device has a spread spectrum clock capability, wherein when receiving, from the second PCIe device, the first indication information, the processor is caused to:
• receive, from the second PCIe device, a first skip (SKP) ordered set carrying the first indication information;
• and
• parse the first SKP ordered set to obtain the first indication information;
• and
• determine, based on the first indication information, whether to perform spread spectrum clock on a reference clock of the first PCIe device.