Data Link Layer - 3.4 English

Versal Adaptive SoC CPM Mode for PCI Express Product Guide (PG346)

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3.4 English

The data link layer acts as an intermediate stage between the transaction layer and the physical layer. Its primary responsibility is to provide a reliable mechanism for the exchange of information between two components on a link. This includes data exchange (TLPs), error detection and recovery, initialization services and the generation and consumption of data link layer packets (DLLPs). DLLPs are used to transfer information between data link layers of two directly connected components on the link. DLLPs convey information, such as power management, flow control, and TLP acknowledgments. The data link layer supports 32 kilobyte replay buffers and the feature DLLP.