Altera Arria 10 Avalon-MM - Manual (Page 27)

Parameter Settings
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2015.05.14
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Arria 10 Avalon-MM System Settings
Table 3-1: System Settings for PCI Express
Parameter Value Description
Number of Lanes x1, x2, x4, x8 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. Select Legacy Endpoint only
when you require I/O transaction support for compatibility.
The Endpoint stores parameters in the Type 0 Configuration
Space. The Root Port stores parameters in the Type 1 Configu‐
ration Space.
Application
Interface Type
Avalon-ST
Avalon-MM
Avalon-MM with
DMA
Avalon-ST with SR-
IOV
Selects either the Avalon-ST interface, Avalon-MM interface,
Avalon-MM with DMA interface, or Avalon-ST with SR-IOV
interface.
RX Buffer credit
allocation -
performance for
received requests
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 allow you to adjust the credit allocation to
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