The following table describes additional interfaces provided by the core.
| Interfaces | Description | Notes |
|---|---|---|
| Transmit Flow Control |
Used by the user application to request which flow control information the core provides. Based on the setting flow control input to the core, this interface provides the following to the user application:
|
Similar functionality |
| Configuration Management | Used to read and write to the Configuration Space registers. | Similar functionality |
| Configuration Status | Provides information about how the core is configured, such as the negotiated link width and speed, the power state of the core, and configuration errors. | Similar functionality as Configuration Specific register ports |
| Configuration Received Message | Indicates the logic of a decodable message from the link, the parameters associated with the data, and the type of message received | Similar functionality as Received Message TLP status ports |
| Configuration Transmit Message | Used by the user application to transmit messages to the core. The user application supplies the transmit message type and data information to the core, which responds with the Done signal. | |
| Per Function Status | Provides status data requested by the user application through the selected function. | Similar functionality as Error Reporting Ports |
| Configuration Control |
Allows information exchange between the user application and the core. The user application uses this interface to:
This interface also provides handshaking between the user application and the core when a Power State change or function level reset occurs. |
Similar functionality as the Power Management Port |
| Configuration Interrupt Controller | Allows the user application to set Legacy PCIe interrupts, MSI interrupts, or MSI-X interrupts. The core provides the interrupt status on the configuration interrupt sent and fail signals. | Similar functionality as Interrupt Generation and Status Ports |
| Configuration Extended | Allows the core to transfer configuration information with the user application when externally implemented configuration registers are implemented. | Similar functionality as Received Configuration TLP Status Ports |