1.1 PF_SYSTEM_SERVICES Overview

The System Controller actions are initiated by the fabric logic through the System Service Interface (SSI) of the System Controller. The fabric logic requires PF_SYSTEM_SERVICES for initiating the system services. A service request interrupt to the System Controller is triggered when the fabric user logic writes a 16-bit system service descriptor to the SSI. The lower seven bits of the descriptor specify the service to be performed. The upper nine bits specify the address offset (0–511) in the 2 KB mailbox RAM. The mailbox address specifies the service-specific data structure used for any additional inputs or outputs for the service. The fabric logic must write additional parameters to the mailbox before requesting a system service. The following table lists the system service descriptor bits.

SSI consists of an asynchronous command-response interface that transfers a system service command from the fabric initiator to the System Controller and the status from the System Controller to the fabric initiator. The following figure shows how the PF_SYSTEM_SERVICES Interfaces with the fabric logic.