Arria V GZ Avalon-ST Interface for PCIe Solutions: User Guide

ID 683297
Date 12/21/2020
Document Table of Contents

4.5.3. Link Capabilities

Table 18.  Link Capabilities  




Link port number (Root Port only)


Sets the read-only value of the port number field in the Link Capabilities register. This parameter is for Root Ports only. It should not be changed.

Data link layer active reporting (Root Port only)


Turn On this parameter for a Root Port, if the attached Endpoint supports the optional capability of reporting the DL_Active state of the Data Link Control and Management State Machine. For a hot-plug capable Endpoint (as indicated by the Hot Plug Capable field of the Slot Capabilities register), this parameter must be turned On. For Root Port components that do not support this optional capability, turn Off this option.

Surprise down reporting (Root Port only)


When your turn this option On, an Endpoint supports the optional capability of detecting and reporting the surprise down error condition. The error condition is read from the Root Port.

Slot clock configuration


When you turn this option On, indicates that the Endpoint or Root Port uses the same physical reference clock that the system provides on the connector. When Off, the IP core uses an independent clock regardless of the presence of a reference clock on the connector. This parameter sets the Slot Clock Configuration bit (bit 12) in the PCI Express Link Status register.