Altera Arria 10 Avalon-ST - Manual (Page 44)

Parameter Settings
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2014.08.18
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System Settings
Table 4-1: System Settings for PCI Express
Parameter Value Description
Number of
Lanes
×1, ×2, ×4, ×8 Specifies the maximum number of lanes supported.
Lane Rate Gen1 (2.5 Gbps)
Gen2 (2.5/5.0
Gbps)
Gen3 (2.5/5.0/8.0
Gbps)
Specifies the maximum data rate at which the link can operate.
Port type Native Endpoint
Root Port
Legacy Endpoint
Specifies the port type. Altera recommends Native Endpoint for all
new Endpoint designs.
The Endpoint stores parameters in the Type 0 Configuration Space.
The Root Port stores parameters in the Type 1 Configuration
Space.
Interface Type
Avalon-ST
Avalon-MM
Avalon-MM with
DMA
Avalon-ST with
SR-IOV
Selects the interface to the Applciation Layer.
RX Buffer
credit
allocation -
Minimum
Low
Balanced
Determines the allocation of posted header credits, posted data
credits, non-posted header credits, completion header credits, and
completion data credits in the 16 KByte RX buffer. The 5 settings
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