Altera Arria 10 Avalon-MM Bedienungsanleitung Seite 122

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Related Information
PIPE Interface Signals on page 5-14
Data Link Layer
The Data Link Layer is located between the Transaction Layer and the Physical Layer. It maintains packet
integrity and communicates (by DLL packet transmission) at the PCI Express link level (as opposed to
component communication by TLP transmission in the interconnect fabric).
The DLL implements the following functions:
Link management through the reception and transmission of DLL packets (DLLP), which are used for
the following functions:
Power management of DLLP reception and transmission
To transmit and receive ACK/NACK packets
Data integrity through generation and checking of CRCs for TLPs and DLLPs
TLP retransmission in case of NAK DLLP reception using the retry buffer
Management of the retry buffer
Link retraining requests in case of error through the Link Training and Status State Machine
(LTSSM) of the Physical Layer
10-4
Data Link Layer
UG-01145_avmm
2015.05.14
Altera Corporation
IP Core Architecture
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