Abstract: A link state machine for the Advanced Switching (AS) Architecture includes added transition sub-states. Transition events typically handled in AS link states are handled in the transition sub-states. Separating the transition events and flow from the link states into smaller transition sub-states may make the AS link machine easier to manage and facilitate debugging efforts.

Abstract: Devices in an Advanced Switching (AS) fabric may include state machines for controlling the generation and transmission of flow control (FC) update data link layer packets (DLLPs) between link partners. A link partner may use the state machine to generate flow control update DLLPs for all available virtual channels (VCs) and transmit the FC update DLLPs contiguously to prevent any given VC from failing to perform an FC update refresh within an FC update timeout period due to injection of large packets (e.g., AS transaction layer packets (TLPs)) between the FC Update DLLPs.

Abstract: A link state machine for the Advanced Switching (AS) Architecture includes added transition sub-states. Transition events typically handled in AS link states are handled in the transition sub-states. Separating the transition events and flow from the link states into smaller transition sub-states may make the AS link machine easier to manage and facilitate debugging efforts.

Abstract: Devices in an Advanced Switching (AS) fabric may include state machines for controlling the generation and transmission of flow control (FC) update data link layer packets (DLLPs) between link partners. A link partner may use the state machine to generate flow control update DLLPs for all available virtual channels (VCs) and transmit the FC update DLLPs contiguously to prevent any given VC from failing to perform an FC update refresh within an FC update timeout period due to injection of large packets (e.g., AS transaction layer packets (TLPs)) between the FC Update DLLPs.

Abstract: An Advanced Switching (AS) device may include a generic state machine to handle flow control (FC) credit initialization and updates for all three types of virtual channels (VCs), i.e., bypass VCs (BVCs), ordered VCs (OVCs), and multicast VCs (MVCs), while handling each type of VC according to its unique requirements. The state machine may transition between states in response to signals from VC logic and disable signals a packet arbiter. The generic state machine may be instantiated for all VCs supported by the AS device.