Altera Arria 10 Avalon-MM DMA - Manual (Page 21)

Parameter Settings
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System Settings
Table 3-1: System Settings for PCI Express
Parameter Value Description
Number of Lanes x1, x2, ×4, ×8 Specifies the maximum number of lanes supported. Avalon-
MM Interface with DMA does not support x1 configurations.
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
Specifies the port type. Altera recommends Native Endpoint
for all new Endpoint designs. The Arria 10 Hard IP for PCI
Express for the Avalon-MM Interface with DMA currently
does not support Root Ports.
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 DMA
Avalon-ST with SR-
IOV
Selects either the Avalon-ST, Avalon-MM interface, or
Avalon-MM interface with embedded DMA.
RX Buffer credit
allocation -
Minimum
Low
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.
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