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The CCN-502 provides link initialization, operation, and deactivation functionality for the link layer.
This functionality consists of the following mechanisms:
A receiving device that communicates link layer credits to a transmitting device immediately following reset.
A flow-control mechanism, where a receiving device can transmit credits and a transmitting device can consume credits during functional operation.
A mechanism, where a transmitting device can return all unused link layer credits to the adjacent receiving device, enabling clock stop or power down of either device using that link.
See the ARM® AMBA® 5 CHI Architecture Specification for a description of the functional requirements of the CHI link layer.