The Data Link Layer acts as an intermediate Layer between Transaction and Physical Layer, nothing but a Gate Keeper. The main responsibility of Data Link Layer is Error detection and correction.
Data Link Layer Model
Data Link Layer takes the TLP-Transaction Layer Packet from transmit side of the Transaction Layer. Here 12 bit sequence Number is added in front of the TLP and LCRC-Link CRC checker to the end.
Data Link Layer then forwards the applied TLP to the Physical Layer transmit side. On the receive side of Data Link Layer, accepts the packet from Physical Layer and checks the Sequence Number and LCRC with the applied Sequence Number and LCRC. If the Sequence Number/LCRC matches then the TLP are moved to receive side of Transaction Layer and generates ACK (Acknowledgement) signal. If there is any mismatches/error detects in Sequence Number or LCRC then Data Link Layer does not send the “Invalid or Bad” TLP to receive side of Transaction Layer, instead it generates NAK (Negative Acknowledgement). Data Link Layer now starts “Retry” attempts to send the valid TLP to Transaction Layer.
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